DE2720534A1 - ADDITIVES TO ELASTIC SEALING COMPOUNDS AND ADHESIVE MATERIALS - Google Patents

Description

Dr. F. Zumstein Sr. - Dr. E. Assmann - Dr. R. Koenigsberger Dipl.-Phys. R. Holzhauer - Dipl.-! Na. F. KJL ^ seisen Dr. F. Zumstein jun.

PATENT LAWYERS

2 7 20S34

Case En / PP
14 / hU

Polychemie GmbH, 89OO Augsburg Additives to elastic sealants and adhesives

The invention relates to elastic sealing compounds and adhesive materials with an addition of finely divided powders Polyethylene or polypropylene or a mixture of these two substances.

Elastic sealing compounds and adhesive materials, e.g. for sealing of expansion and connection joints in construction, for sealing the edges of insulating glass panes, for sealing glass rebates and for Bonding of various materials in mechanical engineering is mainly based on a resin base of polysulphides, silicones, Polyurethanes, but also made from other resins such as butyl rubbers, Acrylic polymers (copolymers and terpolymers) or their mixtures are produced.

The sealants and adhesives listed for the named areas of application contain the corresponding synthetic polymers or precursors of the polymers to be formed, plasticizers, fillers such as calcite, heavy spar or quartz, pigments such as titanium dioxide or carbon black, anti-aging agents and catalysts. Depending on the hardening mechanism they harden through the action of humidity, through oxidation, Polyaddition or drying.

609845/0476

Well formulated elastic sealants and adhesives should be easy to process and elastic connections with high aging and weather resistance, good adhesion and high practical elasticity. A visually flawless, permanently tack-free and crack-free surface without inhomogeneities required.

In order to meet the requirement for optically homogeneous surfaces, a complete digestion and thus good distributability is essential of the fillers required during the production of the elastic products. Despite intensive mixing is also In the case of high-quality products, the breaking up of existing filler agglomerates not always completely, so that these agglomerations form in the fully formed joint or adhesive point make disturbing noticeable.

In the case of high-quality, commercially available, elastic sealing compounds and adhesive materials, those listed above are used Requirements for good adhesion and high practical elasticity are largely met. As a result of the elasticity of the However, in practice there may be adhesion defects or cracks within the masses. root cause the tears on the joint flanks or other substrates and the formation of cracks within the elastic products at higher ^ Expansion, e.g. caused by temperature fluctuations, is the excessive cohesive forces between the individual. nen particles and the polymer chains. Excessive stresses act on the joint flanks when they are stretched Lead demolition.

After the cause of this deficiency had been identified, various attempts to improve quality were carried out and products in which the cohesive forces were deliberately reduced. In such products, the elasticity the sealing compounds and adhesives are reduced by adding increased amounts of plasticizers, so that the under-

8098A5 / 0476

Basic adhesion is increased and the formation of cracks within the elastic mass has been reduced. These masses own in turn however, the disadvantages that they release plasticizers to the surrounding materials and tend to be permanently sticky, which is associated with an increased susceptibility to soiling.

It has now been found that elastic sealing compounds and adhesive materials according to the invention overcome the disadvantages mentioned largely avoided and products with very good application properties, in particular significantly improved Adhesion properties, a lower tendency to form cracks and perfect production possibilities result.

The elastic sealants and adhesives according to the invention are characterized in that they contain an addition of 1 to 40 wt .- # of finely divided powders of polyethylene and / or polypropylene with a molecular weight of 1000 to 10,000, preferably from 2000 to 5000 or a mixture of any Mixing ratio of the two ingredients included. Mixtures of finely divided polyethylene and / or polypropylene powders of different molecular weights can also be used in one formulation, as well as copolymers of ethylene or propylene with olefins having 2 to 6 carbon atoms in the molecule. The measures provided for polyethylene and polypropylene powder may preferably be present from 0 to 50 μ in the inventive elastic sealants and ^v Klebwerkstoffen in a degree of distribution from 0 to 200 u. High-pressure and low-pressure polyethylene are suitable as polyethylene, the latter being preferred .

At concentrations above k0 wt -.% Occur in permanent, dynamic stress fatigue to the material. Below 1 wt .- ^ the advantages described above are not available. A preferred range is 5 to 50, in particular 15 to 20% by weight .

809845/0476

Up to now, finely divided polyethylene waxes have been used, for example, to improve paints and printing inks to achieve matt effects particle distribution, to increase viscosity and to avoid sedimentation (see 82. Year / no. 11/1976).

The main advantage of the sealing compounds and adhesive materials according to the invention is that the force-elongation diagrams recorded with them according to DIN 53 455 give a clearly flatter curve in all cases. As a result, lower forces have to be used for all changes in length (expansion); the cohesive forces are reduced and the tensions ayil ' the joint flanks or other substrates' are reduced.

The practical consequence of this measurable effect is a significantly lower frequency of an adhesion or cohesion failure. In addition, the disadvantages listed above are eliminated, which result from the fact that during production elastic sealants and adhesives do not allow the fillers used to fully break down. The incomplete digestion can inevitably occur, in particular, when a certain process management in which E.g. the action of high shear forces must be avoided, is inevitable. Those with polyethylene or polypropylene powders Manufactured elastic sealants and adhesives are even under unfavorable production conditions completely homogeneous.

Those in the sealing compounds and adhesive materials according to the invention The finely divided polyethylene or polypropylene powder contained must of course also be used with the rest Components of the formulation, e.g. with plasticizers, fillers, catalysts, pigments, stabilizers, etc. be compatible. They are chemically inert to the binders, i.e. they do not interact with them chemically a.

809845/0476

The use of the sealing compounds and adhesive materials according to the invention takes place in the usual way.

The subject of the application is to be explained in more detail in the following examples, without thereby imposing any restriction he follows.

example 1

Elastic sealant for insulating glass panes, two-component. Component I.

40.00 g polysulphide (Thiokol type LP 32)

15.00 grams of dibutyl phthalate

15> 00 g polypropylene powder, molecular weight:

10,000, particle size: 1 to 5 μ 0.30 g colloidal sulfur

29.70 g natural, crystalline chalk, grain size 1 to 5 U

100.00 g

Component II 4.00 g of manganese dioxide.

The polysulfide used has a viscosity of 400 to 500 poise, a water content of max. 0.2 $> and a molecular weight from 2000 to 50,000 (main fraction 10 000). It is the subject of US Pat. No. 2,466,963 to Thiotol Corp., Patrick, JS and Ferguson HR. ·. ■ -

According to the application, polysulfides and additives, in particular fillers, which can also be used in general, can be found in the US patents 3 123 495 and 3 297 630 can be found.

809845/0476

Example 2

Elastic sealant for sanitary jointing, one-component »

4o, o g ei, <^> -Hydroxy-polydimethylsiloxane, viscosity: approx. 50,000 cP

2o, o g silicone oil, viscosity: approx. 1 ooo cP 15, o g polyethylene powder, molecular weight: 3,000,

Particle size: 1 - 15 yes

5 _f og fumed silica, surface: approx. 15o m / g 16, o g natural, crystalline chalk, grain size 1 - 2o .u 4, o g methyl-tri-cyclohexylamino-silane

Ιοο, ο g

Example 3

Elastic sealant for frame connection jointing, two-component

tig. Component I.

35, o g polysulphide (Thiokcl Type LP 32) 2o, o g dibutyl phthalate 15, ο g polyethylene powder, mol.wt .: 5,000,

Particle size: 5 - 4o yes

lo _# og polyethylene powder, mol.wt .: 3,000, _x

^ Particle size: 5 - 4o ju

0.1 g triethylenediamine 19.9 g kaolin, grain size 1 - 40 u

Ιοο, ο g

Component II

3, ο g cumene hydroperoxide, phlegmatized.

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Example 4 : -

Elastic filler for sealing cracks, zveHfompnrientig

Component I ■

• 2.4 g hexanediol 46.9 g chlorinated paraffin, 56% by weight chlorine, liquid 1.2 g lead octoate _:

2 »4 g of fumed silica, surface area: approx. 150 m / g

47.1 g of polypropylene powder, molar weight: 5,000,

Particle size: 2ö - 4o Ai

Ιοο, ο g

Component II '. ■ "

33.8 g adduct of glycerol and approx. 50 moles of propylene oxide 6.1 g of tolylene diisocyanate. -

Example 5

Tough and hard tile adhesive, one-component.

28, ο g diphenylmethane diisocyanate

52, ο g adduct of glycerine and approx. 25 moles of propylene oxide 5, ο g asbestos fiber, fiber length: approx. 2o u lo, o g polyethylene powder, molar weight: Io ooo,

Particle size: 1 - 5 yes

5, ο g xylene

Ιοο, ο g

809845/0478

Example 6

Elastic sealant for building construction joints, component I.

35, o g polysulphide (Thiokol Type LP 32) 5, o g polypropylene powder, mol.wt .: 3ooo,

Particle size: 1 - 15 μ

2o, o g chlorinated paraffin, 56% by weight chlorine, liquid l, o g iron oxide black

o, 2 g colloidal sulfur lo, og titanium dioxide
28.8 g natural, crystalline chalk, grain size 3o - 4o

Ιοο, ο g. "

Components TI

4, ο g lead dioxide.

Example 7

Flexible insulating adhesive, two-component. Component I.

. lo, o g diisodecyl phthalate 3o, o g polypropylene powder, mol.wt .: 5ooo,

Particle size: Io - 3o u

6o, o g 2.2.-DiIΐlethyl-propanediol-1.3.

Ιοο, ο g

Component II '

195, o g benzene diisocyanate 58o, o g adduct of glycerine and approx. 25 moles of propylene oxide,

809845/0476

Example 8 -.

Elastic sealant for glass rebate sealing, one-component "

4o _# o g * i , CJ -hydroxy-polydimethyl-siloxane,

Viscosity: approx. 5o,000 cP

12, o g polyethylene powder, mol.wt .: 5ooo,

Particle size: 5 - Ao Al

8, o g of polypropylene powder, molar weight: 3ooo

Particle size: 2 - 2oyu

7 _# og fumed silica, surface about 15o m 3 o g Triacetoxi-silane
3o _# o g silicone oil, viscosity approx. 1,000 cP

Ιοο, ο g

Example 9

Pias to-elastic sealing compound

60.0 g of acrylic terpolymer, e.g. Paraloid CS 1 from the company

Rohm and Haas, Philadelphia 100,000 grams of xylene

19 _f og of polypropylene powder, mol wt .: 25oo,

Particle size: 3o - 4o μ

2, o g fumed silica, surface approx. 15o τατ / g 2, o g ethylene glycol
7, above pine oil

Ιοο, ο g

809845/0 * 76

Claims (4)

-Xf- claims 1.) Elastic sealants and adhesives, produced made of polysulphides, silicones, polyurethanes, butyl rubbers, acrylic polymers, in particular acrylic copolymers and terpolymers, or mixtures thereof, which are crosslinked by the action of atmospheric moisture, by oxidation or polyaddition after use , or from other common resins or mixtures thereof, characterized in that they contain additions of finely divided Polyethylene or polypropylene powder or powder of ethylene and propylene copolymers with olefins with 2 to 6 carbon atoms contained in the molecule or mixtures thereof. 2.) Composition according to claim 1, characterized in that it contains the polyethylene and / or polypropylene powders individually or in any desired mixtures in a total concentration of 1 to 40 wt -% by weight.. 3.) Means according to claims 1 and 2, characterized in that that the polyethylene and / or polypropylene powders contained in them have a molecular weight between 1,000 and 10,000, preferably between 2000 and 5000, with polyethylene and / or polypropylene powder of different molecular weights can be used. 4.) Means according to claims 1 to 3> characterized in that the polyethylene and / or polypropylene powder used a particle size from 0 to 200 µ, preferably from 0 to 50 µ own. 809845/0476 ORIGINAL INSPECTED