RU2527223C1 - Adhesive composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: as polymer base used is butadiene-nitrile rubber with content of acrylic acid nitrile 18% or 28%. Adhesive composition based on butadiene-nitrile rubber contains butylphenolformaldehyde resin, melting temperature of which constitutes 90-160°C, pine rosin, ester plasticiser (dibutylphthalate, dioctylphthalate), fatty acids of tall oil, methylacetate as solvent.

EFFECT: increased stickiness of adhesive film, time preservation of stickiness and heat resistance of adhesive connection.

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Description

The invention relates to polymer adhesive compositions with a “permanent” stickiness based on nitrile butadiene rubber, which can be used in the furniture industry, construction industry and other technical fields.

Known adhesive composition based on styrene-butadiene rubber containing rosin, epoxy diane resin, industrial oil, oligoxypropylene glycol maleates, an organic solvent [US Pat. 2005759 Russia, IPC C09J 109/06; publ. 01/15/1994], as well as an adhesive composition containing isoprene rubber, 4-polyisoprene rubber, plasticizers - paraffin oil or low molecular weight polybutadiene, an adhesive additive - terphenolic resin and a solvent - nefras [US Pat. 2322470, Russia, IPC C09J 109/00; publ. 04/20/2008]. These adhesive compositions are used to create materials with a sticky layer used in the construction industry and various fields of technology.

Closest to the invention in technical essence is an adhesive composition, which includes butadiene nitrile rubber, carboxyl-containing butadiene nitrile rubber, butylphenol formaldehyde resin, a condensation product of methylsilantriol and phenylsilantriol, an ester plasticizer, benzoyl peroxide [US Pat. 1709724 Russia, IPC C09J 7/02; publ. 09/10/1995].

However, the specified adhesive composition has insufficient stickiness of the adhesive film and its retention time.

The technical result of the claimed invention is to increase the stickiness of the adhesive film, the retention time of the stickiness and heat resistance of the adhesive joint.

The technical solution of the invention is an adhesive composition based on nitrile butadiene rubber containing butylphenol formaldehyde resin, the melting point of which is 90-160 ° C, pine rosin, ester plasticizer (dibutyl phthalate, dioctyl phthalate), tall oil fatty acids, methyl acetate in the following solvent components, parts by weight:

Nitrile butadiene rubber one hundred Butylphenol formaldehyde resin 40 Pine Rosin twenty Ester plasticizer 3 Tall oil fatty acids 0-7 Organic solvent methyl acetate 570

The composition uses: resins - butyl phenol formaldehyde resin with a melting point above 90 ° C, pine rosin [GOST 19113-84], ester plasticizer (dibutyl phthalate, dioctyl phthalate) [GOST 8728-88] and tall oil fatty acids [GOST 14845-79].

As a solvent for the adhesive composition, it is preferable to use methyl acetate [TU 2435-063-00203766-2001].

The adhesive composition is made as follows. First, the required amount of rubber is plasticized on the rollers for 5 minutes at a temperature of 35 ° C. Then the heated rubber, as well as 1/3 of the total amount of solvent (methyl acetate) is loaded into the glue mixer, mixed until a homogeneous mass is formed. After the rubber is completely dissolved, 40 parts by weight are loaded in portions into the glue mixer. butylphenol formaldehyde resin, 20 parts by weight pine rosin, 3 parts by weight plasticizer, 0-7 parts by weight tall oil fatty acids and another 1/3 of the total amount of solvent. Mixing is carried out until a homogeneous system is obtained, after which the remaining 1/3 of the solvent is introduced into the size mixer. The total mixing time depends on the type and condition of the equipment used and can range from 40 minutes to 5 hours.

The resulting adhesive composition is applied to the substrate by a roll method. Next, the adhesive film is dried until the solvent is completely removed and release paper or film is placed on top. For this sticky layer, it is recommended to use waxed paper [GOST 9569-79] as a release material.

The adhesive composition is a viscous liquid from light yellow to light brown in color. The glue is technological, it is well applied to the surface of the substrate.

The adhesiveness of the adhesive film was determined on a Tel-tak device of the Monsanto brand TT-1. The method is based on determining the force required to separate the two contacting surfaces of the samples at a constant speed (26 mm / min) in the direction perpendicular to the contact surface for a set time. As a substrate, rubber based on α-methyl styrene rubber of the SKMS-30 RP brand, made according to the standard formulation, was used. Table 2 shows the test results of adhesive compositions.

The heat resistance of the adhesive joint is characterized by a maximum temperature, after which the adhesive joint is destroyed by shear. The determination of the heat resistance of the adhesive joint is carried out according to the following procedure.

Record the maximum temperature preceding that at which the destruction of the samples occurred. The arithmetic mean of three measurements is taken as heat resistance.

Glue compositions with varying fatty acid content of tall oil have been investigated. The claimed limits of 0-7 wt.h. It was found that the most optimal is the fatty acid content of tall oil of 2 parts by weight, which ensures the best result.

Rubbers with different acrylic acid nitrile (NAC) contents were also investigated, and it was shown that rubber with a NAC content of 18% gives the best results.

The compositions of the adhesive compositions 1-9 and the prototype are shown in tables 1 and 3. The results of the tests are presented in tables 2 and 4.

Table 1 Component Name The content of components, parts by weight, in the composition one 2 3 four 5 Prototype Nitrile butadiene rubber BNKS-18 AMN one hundred one hundred one hundred one hundred one hundred fifty Carboxyl Nitrile Butadiene Rubber - - - - - fifty Butylphenol formaldehyde resin 40 40 40 40 40 41 Pine Rosin twenty twenty twenty twenty twenty - Condensation Product of Methylsilantriol and Phenylsilantriol - - - - - 34 Dioctyl phthalate ester plasticizer 3 3 3 3 3 10 Tall oil fatty acids 0 one 2 5 7 - Benzoyl peroxide - - - - - 0.9 Methyl acetate solvent 570 570 570 570 570 -

table 2 Name of indicator one 2 3 four 5 Prototype Stickiness, kPa 80 87 113 101 85 75 Stickiness retention time, day 6 months 1,5 years > 2 years > 2 years > 2 years 6 months Heat Resistance, ° C 80 80 80 80 80 70 Rubber-rubber bond strength after 24 hours, kN / m 3,1 3,1 3.0 2.9 2.9 3,1

Table 3 Component Name The content of components, parts by weight, in the composition 6 7 8 9 Prototype Nitrile butadiene rubber BNKS-18 AMN one hundred one hundred - - fifty Nitrile butadiene rubber BNKS-28 AMN - - one hundred one hundred - Carboxyl Nitrile Butadiene Rubber - - - - fifty Butylphenol formaldehyde resin 40 40 40 40 41 Pine Rosin twenty twenty twenty twenty - Condensation product - - - - 34

methylsilantriol and phenylsilantriol Dibutyl phthalate ester plasticizer 3 3 3 3 10 Tall oil fatty acids 0 2 0 2 - Benzoyl peroxide - - - - 0.9 Methyl acetate solvent 570 570 570 570 -

Table 4 Name of indicator 6 7 8 9 Prototype Stickiness, kPa 80 113 75 98 70 Stickiness retention time, day 6 months > 2 years 6 months > 1.5 years 6 months Heat Resistance, ° C 80 80 80 80 70 Rubber-rubber bond strength after 24 hours, kN / m 3,1 3.0 2.9 2,8 3,1

This invention finds application in the construction industry, for example for fastening roofing roll materials and other industries.

Claims (1)

An adhesive composition based on nitrile butadiene rubber containing butylphenol formaldehyde resin, an ester plasticizer, characterized in that as a polymer base, nitrile butadiene rubber with an acrylic acid nitrile content of 18% or 28% is used, and the composition additionally contains tall oil fatty acids, pine rosin, an organic solvent in the following ratio of components, mass. hours:
Nitrile butadiene rubber one hundred Butylphenol formaldehyde resin 40 Pine Rosin twenty Ester plasticizer (dibutyl phthalate, dioctyl phthalate) 3 Tall oil fatty acids 0-7 Organic Solvent Methyl Acetate 570