RU2002783C1 - Adhesive composition for sticky bands and films - Google Patents

Abstract

Usage: preparation of adhesive compositions for adhesive tapes and films operated at a temperature of from -60 to-160 ° C. SUMMARY OF THE INVENTION: the adhesive composition for adhesive tapes and films contains acrylate rubber - a copolymer of butyl acrylate, ethoxyethyl acrylate and methyl vinyl pyridine (SCBEP) with a weight ratio of monomers of 45 - 70: 25 - 50: 3 - 5 - 100 wt. low molecular weight acrylate rubber based on ethoxyethyl acrylate and acrylic acid (SKA - RETOX) with a statically distributed or terminal carboxyl group with a functionality of not more than 3.5 and a moamass of 3000 - 5000 - 40 - 60 wt., di-based oxide oligomer. phenylolpropane or tetrabromodiphenylpropane with an epoxy content of not more than 13% 5 to 35 wt. 4, ethyl acetate 200 to 500 may. SKTEVP rubber is dissolved in ethyl acetate, SKA-RETOX liquid rubber is added, mixed and a solution of epoxy resin in ethyl acetate is added. Characteristics of adhesive tapes: peeling strength at 20 ° C from the aluminum alloy on the STF support, 0.9 kg / cm, on the lavsan - 0.85 kg / cm, resistance to static shear stress at a temperature of from -60 to + 160 ° C; C 6000 min 2tables

Description

The invention relates to the field of adhesive compositions and can be used for adhesive tapes and films intended for long-term operation at temperatures from -60 to 60 ° C. The substrates for such adhesive tapes can be various polymer films, fabrics, and also materials with inert surfaces, for example fluorinated fabrics.

The adhesive composition can be used in the form of a portable sticky layer on an anti-adhesive paper.

Adhesives for adhesive tapes which are operable at elevated temperatures are known. For example, an adhesive based on acrylic polymers with additives as a crosslinking agent - isophthalamine, and a catalyst - hetrabutyl titanate or chromium octate. Crosslinking occurs during the removal of the solvent by drying the glue.

A glue composition based on a copolymer of octyl acrylates and acrylic acid is also known, using an amine formaldehyde condensate as a latent hardener of alkoxylates. However, the above clems and adhesive tapes with their use are operable at a temperature not exceeding + 70 ° C,

A glue composition of the following composition was selected as a prototype in May. hours:

Khlorvinilova

resin PSX-LS100,0

Phosphate plasticizer158, 0-164.0

Rosin27.0

The glue composition is used in a LIG adhesive film (TU-17-7Y-85) on a fluorocarbon substrate. Adhesive tape Used in domestic aircraft manufacturing for long-term operation at temperatures from -60 to + 60 ° C. The disadvantages of sticky mite of LNG are low cohesive strength (resistance to long-term action of static shear stress), especially at temperatures above -t -60 ° C, since the adhesive composition contains a low molecular weight phosphate plasticizer, which determines it low cohesive and adhesive properties at temperatures above + 60 ° C.

The aim of the invention is to increase the cohesive strength of the composition at a temperature of from -60 to + 160 ° C, as well as adhesion to various substrates.

This goal is achieved by the composition comprising a polymer base and a solvent of ethyl acetate, characterized in that. that, in order to increase cohesive strength and adhesion to various substrates at temperatures from -60 to

-M60 ° C, it contains acrylate rubber as a polymer base - a copolymer of butyl acrylate, ztoxyethyl acrylate and methyl vinyl pyridine with a mass ratio of monomers 45-70: 25-50: 3-5 and additionally low molecular weight acrylate rubber based on ethoxyethyl acrylate and acrylic acid with statistically distributed or terminal carboxylic acid groups with a functionality of not more than 3.5 mol%. weighing 3000-5000 and a diepoxide oligomer based on diphenylolpropane or tetrabromodiphenylolpropane with an epoxy content of not more than 13 May. % at the following ratio of components, May. hours:

Acrylate rubber butyl acrylate copolymer.

ethoxyethyl acrylate and methyl vinyl pyridine,

brand SKBEVC

(TU 38.403.605.89) 100.0

Low molecular weight

acrylate rubber on

otoxyethyl acrylate based

and acrylic acid,

SKA-Ratox brands

(TU 38.403.664-90) 40.0-60.0

Diepoxy Oligomer 0 Based

diphenylolpropane

ZD-8, ED-10

(GOST 10587-84)

or based on 5 tetrabromodiphenylolpropane FOU-8. TU 38-Ukrainian SSR215-8-805, 0-35.0

Ethyl acetate

(GOST 89981) - 200.0-500.0

0 The novelty of this technical solution lies in the fact that the authors propose a glue composition that allows, without introducing special hardeners, to obtain a partially crosslinkable sticky 5 glue, which ensures its performance in the temperature range from -60 to + 160 ° C while maintaining the balance adhesive and cohesive properties. A significant advantage of the proposed solution is the possibility, if necessary, to vary the balance of adhesive and cohesive properties by changing the ratio of low molecular weight rubber with carboxyl groups and epoxy 5 resin in the composition.

Examples of the preparation of adhesive compositions. Adhesive compositions 1-12 are prepared, the compositions of which are shown in the table.

Example 1. 100 g of rubber SKBEC is dissolved in 200 g of ethyl acetate, then 50 g of liquid rubber SKA-P based on ehoxyethyl acrylpe are added, peg-n is present and 15 g of epoxy CNVfti FOU-8 are added in 1% pid solution in cepsetate I mix the glue mass until a homogeneous solution is obtained,

The properties of adhesives were evaluated on sticky years. Adhesive tapes were woven on a substrate of STF fluorocarcotane (TU 1-92-32-83) or dacron film by pouring glue onto spinnerets. Adhesive tapes were dried in air at a hemisphere of 85-95 ° C for 15 minutes.

Adhesion of adhesive tapes was assessed by their resistance to the action of static kicking during shear of adhesive joints of adhesive tape glued to fluoride: it is .. The bonding area is 6 cm.

The glued samples were subjected to a static load of 0.3 kg in a temperature range of npii. Then noted the time until the complete destruction of the adhesive in minutes

The properties of adhesive tapes obtained on the basis of compositions 1-12, as well as protoshpa are given in the table.

The data presented in the table show the sheer secret advantages of the proposed sticky formulations Knees5, compared with the prototype. So, for example, adhesive joints of adhesive tapes based on the proposed compositions withstand static shear at temperature

5

0

5

5

0

0

round + 160 ° C without destroying more than POOO min, while the prototype samples were destroyed by turning 10-20 mich.

Moreover, the adhesion of adhesive tapes, defined as peeling resistance, exceeds the adhesion of the prototype (compositions 1-5).

If necessary, it is possible to adjust the properties of the cures depending on the composition. For example, the introduction of the maximum amount of liquid rubber into the adhesive composition leads to an increase in its adhesive properties (composition 5). On the contrary, the maximum content of epoxy resin (composition 3} provides high cohesive properties. A preferred composition is composition 1, since it has a combination of optimal adhesive and cohesive properties.

Compositions of compositions 6-12 are ineffective in comparison with the prototype and the proposed compositions of compositions 1-5, since the sitting in the composition of liquid rubber and svogsidnogo resin in quantities of less than 40 and more than 00 may, hours and less than 5 and more than 35 may . including, respectively, as well as the separate use of one of the listed components (liquid rubber or epoxy), it is not possible to obtain sticky polices with simultaneously high adhesive and cohesive properties,

(56) Adhesive tape TU-17-794-85.

Ostoa and cstit-TiD leagues -. “Thu sschose n we offer x composition control and prototype

Table continuation

Table continuation

Claims (1)

The claims ADHESIVE COMPOSITION FOR ADHESIVE TAPES AND FILMS, including a polymer base and a solvent - ethyl acetate. characterized in that, in order to increase cohesion strength and adhesion to various substrates at temperatures from -60 to +160 ° C, it contains acrylate rubber, a butyl acrylate copolymer, as the polymer base. ethoxyethyl acrylate and methyl vinyl pyridine with a mass ratio of monomers of 45 - 70: 25 - 50: 3 - 5 and an additionally low molecular weight acrylate rubber based on ethoxyethyl acrylate and acrylic acid with either terminal carboxyl groups with a functionality of not more than 3.5 and mol.m. 3000 - 5000 and a dihydrogenic oligomer based on diphenylolpropane or tetrabromodiphenylolpropane with an epoxy content of not more than 13 wt.% In the following ratio of components, wt.h .: Acrylate rubber is a copolymer of butyl acrylate, ethoxyethyl acrylate and methylvinylpyridine100 Low molecular weight acrylate rubber based on ethoxyethyl acrylate and acrylic acid 40-60 DISPOXIDAL oligomer 5-35 Etidacetet200 - 500