Note: Descriptions are shown in the official language in which they were submitted.
` 2~60~ ~
:
Bg/m-635PE
Two-part polyurethane reactiye adhe~ive ~ubstances_capable
of bei~ mea~ured out i~ the volume ratio of 1:1
The invention relates to two-part polyurethane reactive
adhesivè substances which can be applied overhead without
dripping, are free from inorganic fillers and can be
measured out in the volume ratio of 1:1.
; ~ In many applications of polyurethane systems, particularly of adhesives, it is desirable that the systems display
intrinsically viscous or thixotropic behaviour, so that
following application a high viscosity rapidly ensues~and
flowing or dripping of the track of adhesive (of the
adhesive layer) is prevented. The invention relates
particularly to specific adhesive two-part systems of the
polyurethane type capable of being used without problems
both in assembly work in the field of construction and in
repair work. In these areas of use in particular it is
desirable that the adhesive system does not flow after
application to the substrate, because it is often necessary
to operate overhead or in the vertical position. Various
ways of dealing with these circumstances have become known.
Hitherto use has been made to some extent of paste-like
filled adhesives containing in addition organic and/or
inorganic thickeners, wherein in two-part systems usually
the polyol component is filled, particularly with fillers
to render it physically thixotropic. Here mostly inorgani~c
substances such as sheet silicates are used. It is
difficult, however, to produce systems capable of being
measured out in a volume ratio of 1:1 by this means, owing
to the stoichiometry and density ratios. Filling the
polyisocyanate components with inorganic or organic fillers
;~; is difficult, because the latter have to be freed from
; Le A 30 220-FC
,:... .. '.,',,<
, ,., ,::.,."" .. ......
~ 21~607~
contained water at great expense. Although such paste-like,
physically thixotropic adhesive systems do not flow, this
property is desirable during the actual assembly but not
during the application of the adhesive to the substrate. On
one hand, application is rendered difficult or even
impossible and on the other, the said adhesives do not flow
- on the surface of the substrate. For this reason a
satisfactory wetting may not be obtained. Moreover, the
mixing of such a filled polyol component with the
isocyanate component immediately prior to the application
of the adhesive is rendered far more difficult.
For this reason other systems have become known wherein
amines are added in order to produce a "non-sagging"
behaviour, that is, to ~stablish a track of adhesive
(adhesive strip) which is resistant to flowing. The use
especially of amines to produce a "non-sagging" character
in adhesives is described in US 3 979 364, 4 336 298 and
; 4 444 976 as well as in EP-A 63 534.
US-A 3 714 127 describes two-part polyurethane adhesives
based on an isocyanate prepolymer to which is added an
amine for the purpose of increasing the viscosity and
ensuring a "non-sagging" behaviour. A two-part polyurethane
adhesive having a polyol component which contains a
polyester triol or a polyether triol, a phenylenediamine or
a tin catalyst is described in EP-A 0 068 209. The said
, : ~: .:
mixture is reacted with an aromatic diisocyanate. A two- ~
part polyurethane adhesive which is the reaction product of ;
a hydroxyl functional substance, a diamine or triamine and ~; ;
an organic isocyanate is described in EP-A 248 254. The ~ -
adhesives produced in this way are distinguished by their - ~ ;~
outstandin~ properties, but they still do not satisfy all
~`; the requirements as regards stability in storage of the
~; 35 polyol component. In EP 0 481 319 a two-part polyurethane
adhesive is described which is the reaction product of a ;
hydroxyl functional substance containing a low-molecular
~ :. ~ .,
Le A 30 220-FC - 2 -
~: ~..:
: ' '' - -" '':
, .... ....
21~6076
chain extender which has at least one C-C double bond or
one C-C triple bond, a diamine or triamine and an organic
polyisocyanate. The adhesive produced in this way is
distinguished by having good technical bonding properties
and good stability in storage~ However, there is no
reference to mixtures capable of being measured out in the
volume ratio of 1:1. In the examples, resort is invariably
made to crude MDI as the polyisocyanate compound. The
latter has an NCO content of approximately 30.4%.
In DE 40 23 005, thixotropic polyurethane systems are
described which resort to polyol components containing a
mixture of polyamidamines and low-molecular, multi-
functional, in particular aromatic amines. The influence of
the additives on the flow behaviour of the track of
adhesive is mentioned.
,. ~,
It is stated that adequate stability in storage and
adequate thixotropy does not ensue from the sole use in the
polyol component of a low-molecular, multifunctional amine.
There is no indication as to how the intimate mixing of the
polyol component together with the additives and the
isocyanate components immediately prior to the application
is to be carried out. Mixtures of polyol components and
polyisocyanate components in the weight ratio of
approximately 2:1 to 4:1 are described. There is no
reference to components capable of being measured out in ~` ;
the volume ratio of 1:1. ~
The object of the present invention is therefore to provide ; i
two-part polyurethane reactive adhesive substanceslwhich
can be applied overhead without dripping, are free from
inorganic fillers and can be measured out in the volume
ratio of 1:1. The adhesive substances according to the
invention are moreover to exhibit good stability in
storage.
Le A 30 220-FC - 3 -
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21~607~
The present invent.ion therefore provides two-part ;
polyurethane adhesive substances which can be applied ;~
overhead without dripping, are free from inorganic fillers, :
are easily storable and can be measured out in the volume
ratio of 1:1, consisting of
A) a polyisocyanate component having an NCO content of
from 10 to 25~ by weight, a maximum viscosity of ~-:
2,500 mPa.s (25C) and an average functionality of
from 2 to 3, ,;
.....
B) i) at least one aliphatic diol having an OH number
of yreater than 835 mg KOH/g, ;
ii) at least one polyol having an average OH number
of from 20 to 200 mg KOH/g and an average
functionality of from 2 to 4,
~ . .
iii) at least one aliphatic or aromatic difunctional
or trifunctional amine having a maximum mole-
cular weight of 300 g/mol, wherein the average ;;.
OH number of the total component B) is from 200 :
to 290 mg KOH/g and the diols, the polyols and
the amines of component B) do not separate out ~ :~
and the viscosity of component B) is at most ;~
3,000 mPa.s (25C) and :
:: . ,: :
) from 0.005~ to 2.0~ by weight, referred to the entire
adhesive substance, of suitable catalysts for the
reaction of component A) with component B). ~ -~
Preferred polyisocyanates of component A) of the adhesive
subs~ances according to the invention are those of the kind
known from polyurethane chemistry and commonly used there.
They are in particular polyisocyanates based on aromatic
compounds, for example, 2,4-diisocyanatotoluene, technical ~ -
mixtures thereof with 2,6-diisocyanatotoluene, 4,4'-diiso-
Le A 30 220-FC - 4 -
.
:
2146076 ~ ~'
,:
cyanatodiphenylmethane, mixtures thereof with the corre- -
sponding 2,4l- and 2,2'-isomers, polyisocyanate mixtures of
the diphenylmethane series which can be obtained in a
manner known per se by phosgenation of aniline-formaldehyde
condensates, the modified products of the said technical -
polyisocyanates, which products contain biuret groups or -
isocyanurate groups, and particularly NCO prepolymers of ~ -:
the aforesaid kind based on the one hand on these technical
polyisocyanates, and on the other hand on the simple ~ :~
polyols and/or polyether polyols and/or polyester polyols : :
which are referred to by way of example in connection with
component B) described below, and also any mixtures of such
isocyanates provided they are sufficiently stable in :~
~:~ storage.
.
Among the higher molecular, modified polyisocyanates, of
particular interest are the prepolymers known from .~
:: polyurethane chemistry possessing terminal isocyanate .::. .~
~: groups and having a molecular weight in the range of from
400~ to 10,000, preferably 600 to 8,000 and particularly ~` . ;
~ from 800 to 5,000. The said compounds are prepared in a
:~ : manner known per se by reacting excess quantities of simple `: .: -
polyisocyanates of the kind exemplified above with organic ,.`,!~',,~'.''','.`',
: compounds having at least two groups reactive towards
isocyanate groups, particularly organic polyhydroxyl
compounds. Suitable polyhydroxyl compounds of this kind are -;~,.`~.
simple:polyhydric alcohols in the molecular weight range o~ .,`~`
from 82 to 599, preferably from 62 to 200 such as, for ~; : .. }
: exa ~ le, ethylene glycol, trimethylolpropane, propanediol~
: 30 1,2 or butanediol-1,4, or butanediol-2,3, but particularly
; ~higher molecular polyether polyols and/or polyester polyols:
o~;the kind known per se from polyurethane chemistry having
: mole~cular weights o~ from 600 to 8,000, preferably 800 to ...
4,000, which possess at least two, as a rule 2 to 8, but
: 35 preferably 2 to 4 primary and/or secondary hydroxyl groups.
It is, of course, also possible to use those NCO
prepol mers which have been obtained, for example, from
Le A 30 220-FC - 5 -
214~076
low-molecular polyisocyanates of the kind exemplified above
and less preferred compounds which contain groups reactive
towards isocyanate groups such as, for example, polythio-
ether polyols, polyacetals which contain hydroxyl groups,
polyhydroxypolycarbonates, polyester amides which contain
hydroxyl groups or copolymers of olefinically unsaturated
compounds which contain hydroxyl groups. Examples of
compounds possessing groups reactive towards isocyanate
groups, particularly hydroxyl groups, which are suitable
for preparing the NC0 prepolymers, are the compounds
disclosed by way of example in US-PS 4 218 543, column 7,
line 29 to column 9, line 25. In the preparation of the NC0
prepolymers, the said compounds possessing groups reactive
~; towards isocyanate groups are reacted with simple polyiso-
cyanates of the kind exemplified above, while maintaining
an excess of NCO. The NC0 prepolymers generally have an
NC0-content of from 10 to 25~ by weight, preferably 15 to
22~ by weight. It readily follows from this that, within
the scope of the present invention, by "NCO prepolymers"
and "prepolymers possessing terminal isocyanate groups" are
to be understood both the reaction products as such and
mixtures thereof with excess quantities of unreacted
starting polyisocyanates, which are frequently referred to
as "semiprepolymers."
- . :
The polyisocyanate component A) of the adhesive substances ~-
according to the invention have a maximum viscosity of
2,500 mPa.s (25C), preferably from 1,000 to 1,800 mPa.s,
and an average functionality of from 2 to 3, preferably
from 2.3 to 2.7. ~ -~
li: I i ' ' ! : , : , ,
In order to establish a definite NCO content in component
A), it can be useful to mix an NC0 prepolymer with pro- -
portions of crude MDI. The proportions of higher functional
~- ~ 35 material (functionality greater than 4) in the crude MDI
can easily be tolerated, provided that the average func-
tionality of 3 in component A) is not exceeded.
Le A 30 220-FC - 6 - ~ - ~
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. 2l46~76 , ',.'~
Suitable aliphatic diols having an OH number of greater ~ ~ ;
than 835 mg KOH/g (component B)(i)) are the chain extenders
common in polyurethane chemistry such as ethylene glycol,
diethylene glycol, propylene glycol, dipropylene glycol,
butanediol-1,4, propanediol-1,3. Diols having better compa-
tibility with the polyols (ii) of component B) are pre- ~;
ferred. Examples which may be given are 2-butenediol-1,4,
butanediol-1,3,butanediol-2,3,2-butynediol-1,4,2-methyl- ,;
propanediol-1,3. It is, of course, also possible to use the ~; :
aliphatic diols mixed with one another.
Polyols having an average OH number of from 20 to 200 mg ;:~
KOH/g and an average functionality of from 2 to 4 are ; ~
suitable as component B) (ii). Those having an average OH ~ :;
number of from 28 to 165 mg KOH/g and an average ~ ~.
functionality of 2.7 to 3 are preferred. Examples of such ~ 'i
polyols are polyhydroxypolyethers, which are known from - ; ;
pol ~ rethane chemistry and are obtainable by alkoxylation
of suitable starter molecules such as ethylene glycol, ` `..
diethylene glycol, 1,4-dihydroxybutane, 1,6-dihydroxy- .. ,
hexane, dimethylolpropane, glycerol, pentaerythritol,
~;~ ` sorbitol or saccharose. The following likewise function as `~
starters: ammonia, or amines such as ethylenediamine,
hexamethylenediamine, 2,4-diaminotoluene, aniline, or
aminoalcohols or phenols such as bisphenol A. Alkoxylation
is carried out using propylene oxide and/or ethylene oxide `~
in any sequence.
Polyester polyols obtainable through the reaction, in a .~;.~'` .
known manner per se, of low-molecular alcohols with poly-
, carboxylic acids such as adipic acid, phthalic lacid
hexahydrophthalic acid, tetrahydrophthalic acid or the .
; anh drides of these acids are moreover suitable, provided ; -
that the viscosity of component B) does not become too
high. Castor oil is a preferred polyol which contains ester
groups. Moreover, formulations containing castor oil such ;;
as can be obtained through the dissolution of resins, for
Le A 30 220-FC ~ 7 ~
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21~6076 ~:
example, from aldehyde-ketone resins, as well as modifi-
cations of castor oil and polyols based on other natural
oils are also suitable. Formulations containing castor oil ~ -
and aldehyde-ketone resins are especially preferred because
the stability of component B regarding separation can be
enhanced.
".", ',",
Likewise suitable are those higher molecular polyhydroxy-
polyethers wherein high-molecular polyadducts or poly-
condensates or polymers are present in finely dispersed,
dissolved or grafted form. Modified polyhydroxyl compounds
of this kind are obtained, for example, when polyaddition
reactions (for example, reactions between polyisocyanates
and aminofunctional compounds) or polycondensation reac- ~ ;
tions (for example, between formaldehyde and phenols and/or
amines) are allowed to proceed in situ in the compounds
containing the hydroxyl groups. Processes of this kind are
described, for example, in DE-AS 1 168 075 and 1 280 142, ~-
and also in DE-A 2 324 134, 2 423 984, 2 512 385,
2 513 815, 2 550 796, 2 550 797, 2 550 833, 2 550 882,
2 633 293 and 2 639 254. According to US-A 3 869 413 or
DE-A 2 550 860, it is however also possible to mix a
~ prepared aqueous polymer dispersion with a polyhydroxyl
; compound and subsequently to remove the water from the
;~ 25 mixture.
'' ',
Substances also suitable as component B) for the process
according to the invention are polyhydroxyl compounds modi-
fied by vinyl polymers, which polyhydroxyl compounds are
obtained, for example, by polymerisation of styrene and
,acrylonitrile in the presence of polyethers j(US-A
3 383 351, 3 304 273, 3 523 093, 3 110 695; DE-A 1 152 536) ~ ;
or polycarbonate polyols (DE-PS 1 769 795i US-A 3 367 909).
When use is made of polyether polyols which have been
modified in accordance with DE-A 2 442 101, 2 844 922 and
2 646 141 by graft polymerisation by means of vinyl
phosphonates and optionally (meth)acrylonitrile, (meth)-
Le A 30 220-FC - 8 -
',,
21~607~
acrylamide or OH functional (meth)acrylates, the plastics -
obtained have exceptional flame resistance.
Representatives of the compounds referred to according to
the invention to be used as compounds B) (ii) are ~ ;
described, for example, in High Polymers, Volume XVI, ;~
"Polyurethanes, Chemistry and Technology", edited by ~ -
Saunders-Frisch, Interscience Publishers, New York, London, ~
Volume lj 1982, pages 32-42 and pages 44-54 and Volume II, ; ,
1984, pages 5-6 and 198-199, and also in Kunststoff
Handbuch, Volume VII, Carl Hanser Verlag, Munich, 1983, for ; ~
~ example, on pages 45-61. ~`
; Mixtures of the compounds listed may, of course, also be
used.
, , . . ., " ,:-
The restriction on the average OH number and the average
functionality of component B) (ii) is a consequence in ~ ~;
particular of the increasing brittleness of the resulting
polyurethane. But the person skilled in the art is in ~;~
principle aware of the possibilities of influencing the ir~ ;h~t;~
polymeric and physical properties of the polyurethane, so ~ -
that the NCO component A), diol B) (i) and polyol B) (ii) -
can be coordinated with one another in an advantageous
25 ~ manner. ``
9uitable aliphatic or aromatic difunctional or trifunc~
tional amines (component B) (iii)) are preferably those
having a maximum molecular weight of 300, particularly from . `
60 to 300.
Here dlamines such as 1,4-diaminobenzene, 2,4-diamino-tolu~
ene,~2,i'- and/or 4,4'-diaminodiphenylmethane are particu~
larly preferred, or preferably those diamines which have at ,~
least one alkyl substituent in each ortho position to the
amino groups, particularly those which have at least one
al l substituent in the ortho position to the first amino
`~ Le A 30 220-FC - 9 -
... .......
.~ .. -,..........
2146076 ;
.
group and two alkyl substituents each possessing 1 to 3
carbon atoms in the ortho position to the second amino
group, particularly preferred those which have an ethyl,
n-propyl and/or isopropyl substituent in at least one ortho
position to each of the amino groups and optionally methyl
substituents in other ortho positions to the amino groups.
The said preferred or particularly preferred diamines
include 2,4-diaminomesitylene, 1,3,5~triethyl-2,4-diamino-
benzene, 1,3,5-triisopropyl-2,4-diaminobenzene, 1-methyl-
3,5-diethyl-2,4-diaminobenzene, technical mixtures thereof
with 1-methyl-3,5-diethyl-2,6-diaminobenzene, 4,6-dimethyl-
2-ethyl-1,3-diaminobenzene, 3,5,3',5'-tetraethyl-4,4'-di-
aminodiphenylmethane,3,5,3',5'-tetraisopropyl-4,4'-diami-
nodiphenylmethane or 3,5-diethyl-3',5'-diisopropyl-4,4'-di-
; 15 aminodiphenylmethane. Any mixtures of these aromatic
diamines may likewise be used.
Isophorone diamine, bis(4-aminocyclohexyl)methane, 1,4-di-
aminocyclohexan~, ethylenediamine and its homologues, and
piperazine are particularly prefarred aliphatic diamines.
The two-part polyurethane reactive adhesive substances
according to the invention contain the catalysts conven-
tional in palyurethane chemistry for the reaction of
polyols with polyisocyanates and optionally other auxiliary
; ~ substances and additives. These include in particular basic
nitrogenous compounds and Lewis acid catalysts and also
;~ insertion catalysts (compare, for example, Kunststoff
Handbuch, Volume VII, Carl Hanser Verlag, Munich, 1983, for
. , ,
example, on pages 92 to 99). Preferred catalysts which may
bq named are tin-containing compounds such~ as dibutyltin
dilaurate, bismuth-containing compounds such as bismuth -~
trisneodecanoate, tertiary amines such as N,N-dimethyl-
benzylamine. N-acylated amines, such as the catalyst having
the following structure, are particularly preferred~
: .
~ .
~ :;
Le A 30 220-FC - 10 - ;
. , . ., ~ ..
: : ' '
~ ' ',
2 1 ~ ~ 0 7 6
~ (CH2)3N(C~3)2
OHCN
\(CH2)3N(CH3)2
The catalysts are usually added in quantities of from
0.0005 to 2~ by weight, preferably from 0.01 to 0.5~ by
weight, referred to the total adhesive substance.
Examples of the auxiliary substances which may be used are
dyes, zeolites, desiccants, pigments, antioxidants and
bonding agents known from polyurethane chemistry (see, for
example, Kunststoff Handbuch, Volume VII, Carl Hanæer
Verlag, Munich, 1983, for example, pages 107 to 109). The
auxiliary substances are employed in conventional quanti~
ties, for example, in quantities of from 2 to 8~ by weight,
referred to the total adhesive substance.
The two-part polyurethane reactive adhesive substances
according to the invention are particularly suitable for
bonding together plastics, metals, wood, stone and glass.
~ The application of the two-part polyurethane adhesive sub~
stances according to the invention is carried out
preferably by continuous mixing of the two components A)
and B) either in a paddle mixer, in a static mixer or in a
countercurrent mixer, and immediate application of the
finished adhesive as a track to at least one of the
; ~ substrates to be bonded. A preparation of the surface of
the~substrate by cleaning, roughening or other pretreatment
is frequently unnecessary. The proportions of isocyanate
pomponents to polyol components~ follow the !prinçiples~
generally applicable in isocyanate chemistry; one operates
with a slight excess of i.socyanate (characteristic range~
100 to 125, preferred 105 to 118).
Le A 30 220-FC
, ... , ~
- . '. ':'.
21~6076
.:
Processing of the individual components in a commercial .:
twin cartridge apparatus, with the cartridges in a volume .
ratio of 1:1, is particularly preferred.
Thè subject-matter of the present invention is illustrated
: in more detail by means of the following examples (the
percentages given refer to % by weight, unless indicated :
otherwise).
: ' ,,
:~ ~; ',' ',
' ': ,'
;:,
,
. .
:: - .,
:: : : ;. .:
, .: -. . :.:
; '" ,~.:
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2146076 : :;
, . . ., , ;: ;~ ~ " .,;,
Ex ~ples
:," ".',; ,, .,~-
General
. :,, :. ~ ~ .
I) Catalyst: Catalyst l = tert. amine catalyst of
~: the structure:
(CH2)3N(CH3)2
OHCN~
(CH2)3N(CH3)2 : ~ i,
"'.'" ~''": ';
II) ~ Zeolite paste~
: A 50% zeolite ~uspension in castor oil
: III) Hl2-~ A: aliphatic diamine of the structure ;~
''f~
~ H2N~CH2~NH2
: IV) IPDA: aliphatic diamine of the structure:
\ rNH2
/~ NH
. ~ 2 0:
V) Crude MDI: 4,4'-diisocyanatodiphenylmethane
: mixed with its:isomers and higher homologues, :~
which are obtained through phosgenation of .`:
aniline-fo ~aldehyde condensates, NC0 content ;~
;25~ 3~,iviscosity at 25C: approximately 1801mPa.s . `~
VI) ~ Prepolymer l:
Prepolymer based on diphenylmethane diisocyanate :,
containing a proportion of 50~ of the 2,4'-iso~
;~; : mer and a mixture of difunctional and tetra- ..
Le A 30 220-FC - 13 -
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~46~76
....... . .
!
functional polyether polyols, NCO content 15.5%,
viscosity at 25C, approximately 1,600 mPa.s
VII) Chain extender:
cis-BD = 2 cis-butenediol-1,4
M-PD = 3-methylpropanediol-1,3
BD-1,3 = butanediol-1,3
~; VIII) Polyols:
A: trifunctional polyether polyol: 87% of
propylene oxide, 13% of ethylene oxide
terminal groups, Mn = approx. 4800 g/mol, ~ :
OH number: 35 mg KOH/g.
B: Castor oil with a dissolved additive of 20%
; ~ by weight of a resin which contains
hydroxyl groups, which was obtained by
condensation of cyclopentanone with
methanal (OH number: 165 mg KOH/g).
-
~ ~ .:;
;i~ C: A filler polyether is prepared, wherein the
continuous phase used is 780 parts by ~ -~
weight of a polyether polyol having an OH `
number of 35 mg KOH/g, prepared by propoxy~
lation of trimethylolpropane and ethoxy~
lation of the product of the propoxylation
(PO:EO ratio = 83:17).
Through the~ radical in situ polymerisation
o 120 parts by weight of a mixture of
acrylonitrile and styrene in the weight
; ratio of 60 to 40 in the polyether, a pol~
ether is formed having a content of non-
sedimenting, organic filler of 20~ by
weight and an OH nu~er of 28 mg KOH/g.
~ -
F: Castor oil ~OH number approx. 160 mg
KOH/g).
Le A 30 220-FC - 14 -
.
,
21 ~ 6~ 7 6 ; ~
. ~ " ~
Mechanical testing o~ the adhesive substance: -
To test the combined tensile and shear strength in
accordance with DIN 53 283, a single row of overlapping ;
compounds was prepared from the plastic material to be
bonded. The thickness of the bonded joint was 0.8 mm, the
width of the test sample was 20 mm. The thickness of the
test sample from SMC was 4 mm. The thickness of the iron ~ n
sheet was approx. 1.5 mm, and the thickness of the alumi~
nium sheet (shiny and matt) was approx. 1.5 mm. The length
of the overlap was 10 mm (SMC, iron sheet) and 20 mm (alu~
minium). The combined tensile and shear strength is given
as the average value of five samples. The bonded parts were
not subjected to any special pretreatment except for
degreasing. ~ `
.... :,;..,,~.~
Following the bonding process, the bonded test samples were ~ ,~
stored for two to three days at room temperature and then
torn apart at room temperature. .
To determine the sagging behaviour and the technical '~
bonding properties, a twin cartridge apparatus from the
firm W.A. Keller Proze~technik (CH-Rotkreuz) supplied with
a static mixer 12 cm in length was employed for mixing and ~ '~
manual measuring of the adhesive. '~
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21~076 :
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D ,~ o _ _ _ _ _¦
1~ ~ ~ ~ ;~<~ ~ ~ ~ ~ ~< ~1 . '.~'
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,.3~ ~ ~
: ~ : ''' ~ . ~
~ ____ _ __- __ `
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: ~ ~ .~
,'
~a ~ ~ _ ~ _ _
a ~ ~ O ~ O g~ O ~ .
~ ~ ~ ~1 ~ O t~ O ~ O ~ O ~ O ~ V ~ ~ I
,, ~ __ _ . '.~
b ~,~ j~ ¢ ~ ~ ~ o. ~l ~ ~ ~ v~ ~ ~ ~ ~ J ~ ¦ ~ ~
O.~ ¢ ~,) I . ' ~
o ~ O ~0 O 0~ x:~ ~ 00 x~ 'a~ x~ ~ ~ -
V b e~ ~^ _. ~ ~ ~ ~ ~t
.~ O, ~ ~ 0 _ ,~ 0.0 0 ~ O ~ _ ,~ _.~ _
b ~ _ . _ .
q _. ~ ~ ~ V~ ~t` X o~
~: l _ _ == . __ __ _ ":: . '
Le A 30 220-FC - 16 -
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21~6076 ~ ~
Curing at room temperature: 2 to 3 days
The matt aluminium test samples buckle during the tearing
process.
: ; ~
M-PD 1,3 = 2-methylpropanediol-1,3
cis BD-1,4 = cis butanediol-1,4
BD-1,3 = butanediol-1,3. -~ ;
,:, ;:;, .,' ~',
o Polyisocyanate mixture A:
:' ~, `
Mixture prep. 1 (3 parts by weight)
to crude MDI (1 part by weight):
Viscosity (23C) approx. 1790 mPa.s. ~;
Mixture prep. 1 (10 parts by weight) ; ,
to crude MDI (5.6 parts by weight): '
Viscosity (23C) approx. 1150 mPa.s. ~ `
~: ~ .' , ................................................................... - .,.`
:' `: . ~::;,
."., ~' `'; '.:
., .: . . ~
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