Butadiene-nitrile rubber based adhesive composition

FIELD: chemistry.

SUBSTANCE: butadiene-nitrile rubber based adhesive composition contains phenol formaldehyde resin, polyvinylchloride resin which is chlorinated or chlorinated isopreprene rubber, zinc oxide, magnesium oxide, organic solvent and filler. The filler is a mixture of lignocellulose polydispersed fibre materials and ethyl cellulose. The lignocellulose polydispersed fibre materials are wastes from textile industry, wood chemical and/or cellulose and paper production.

EFFECT: composition increases adhesion strength of various substrates and improves thixotropic properties.

4 tbl, 2 ex

 

The invention relates to compositions of adhesive compositions based on butadiene-nitrile rubber (BOC) and can be used in rubber, footwear, automotive industry, furniture industry, construction industry and in other fields.

Known adhesive composition comprising polychloroprene and/or butadiene-nitrile rubber, adhesive additive, water, zinc oxide, magnesium oxide, filler, vulcanizing agent, calcium stearate, chlorinated polyvinyl chloride, phthalic anhydride, an organic solvent (U.S. Pat. 2063994 Russia, IPC 09J 111/00; publ. 20.07.1996).

However, this adhesive composition has insufficient adhesion and thixotropic properties.

The closest in technical essence to the invention is an adhesive composition, which includes the NBR SKN-26, as increasing adhesive-cohesive strength additives - phenol-formaldehyde resin, PVC resin chlorinated or chlorinated isoprene rubber, zinc oxide, magnesium oxide, as the filler is silicon dioxide, the solvent - ethyl acetate (U.S. Pat. 2078108 Russia, IPC 09J 109/02; publ. 27.04.1997).

However, this adhesive composition has insufficient bond strength.

The technical result consists in increasing the adhesion to various substrates and the improvement in t is stropnik properties.

The technical solution of the invention is an adhesive composition based on butadiene-nitrile rubber containing phenol-formaldehyde resin, PVC resin chlorinated or chlorinated isoprene rubber, zinc oxide, magnesium oxide, the solvent is ethyl acetate, used as a filler mixture of lignocellulosic polydisperse fibrous material and a thermoplastic derivative of cellulose (ethyl cellulose) in the following ratio of components, mass:

The NBR100,0
Phenol-formaldehyde resin20,0-30,0
Resin chlorinated polyvinylchloride/
Chlorinated isoprene rubber10,0-30,0
Magnesium oxide2,0-5,0
Zinc oxide2,0-5,0
Filler5,0-20,0
Organic solvent200,0-500,0

Lignocellulosic polydisperse fibrous materials (LC is M) represent a waste of the textile industry, resin and/or pulp and paper production from white to light gray in color, insoluble in ethyl acetate. Composition: 30-45 - 97-98% cellulose, 2-3 - 55-70% lignin.

Ethylcellulose (EC) polydisperse molecular weight (from 100 to 500 thousand) and the particle sizes of the powdery filler is white with a yellowish tinge, TPL=170-190°C solubility in EA no more than 5%.

The ratio LCWM/EC in the composition of the filler can vary from 1/5 to 5/1.

Examples of execution of the invention.

Example 1. The adhesive composition is prepared as follows. First, cook the rubber mixture containing 100 mass nitrile butadiene rubber, 4 mass of magnesium oxide and 5 mass of zinc oxide, 10 mass filler on the rolls for 15 min at 40°C. Then heated rubber mixture from 43.5 mass ethyl acetate is clearesult, mix until smooth. Remaining solvent (391,5 MASC) with 30 mass phenol-formaldehyde resin, 10 mass resin chlorinated polyvinylchloride/chlorinated isoprene rubber boot portions in clearesult. Total time clemmesen is 4.5-5 hours

The obtained adhesive composition is applied to the bonding substrates, representing cotton cloth, tarpaulin. The duplicate samples, and adhesive bonding characterize the strength of the bonding.

Examples 2-6 are prepared analogously to example 1, but as filler take LCWM/EC specified in table 1 ratio.

Table 1 shows the compositions of all tracks.

The adhesive composition is a liquid from light brown to dark brown. Adhesive tech, well-applied to the surface of the substrate. The viability of glue - not less than 6 months.

The strength of the bonding of the substrates when the delamination is assessed according to the GOST 6768-75.

In tables 2,3 and results of the tests of adhesive compositions.

Have been investigated by various content filler LCWM/EC - 1/1 (table 3).

The stated limits 50,0-20,0 mass 100 mass elastomer due to the fact that when you increase or decrease the indicated dosages bond strength decreases.

It is established that the optimum filler content of 10.0 mass 100 mass elastomer that provides the best results.

Table 1
ComponentThe content of components in the composition, mass
12346The placeholder
The NBR100,0100,0100,0100,0100,0100,0100,0
Phenol-formaldehyde resin30,030,020,020,030,030,030,0
Resin chlorinated polyvinylchloride/Chlorinated isoprene rubber10,010,020,020,010,010,010,0
Zinc oxide5,05,04,04,05,05,05,0
Magnesium oxide4,04,02,0 2,04,04,04,0
Prototype silicon dioxide------20,0
LCWM/EC-1/110,0------
LCWM/EC-1/5-10,0-----
LCWM/EC-5/1--5,0----
LCWM/EC-1/2---20,0---
LCWM/EC-2/1----10,010,0-
The ethyl acetate435,0435,0435,0435,0400,0400,0435,0

Table 2
Time to test the concatenated sampleThe bond strength rubber-rubber, kN/m
The proposed compositionThe placeholder
123456
24 hours2,92,72,62,82,72,72,1
72 h 3,12,92,93,13,02,92,5

Table 3
Justification the boundary limits
The adhesive composition No. 1
Content fillerThe bond strength rubber-rubber, kN/m
4,02,5
25,02,4
20,02,9
5,03,0
10,03,1
the placeholder2,5

Table 4
The strength of bonding of various substrates
SubstratesThe proposed composition of the Sabbath.
The placeholderNo. 1No. 2
Rubber-rubber2,53,12,9
Leather-leather2,63,43,2
Cloth-cloth2,83,73,5
Fabric-leather2,63,12,9

Thus, as can be seen from tables 2-4, the use of adhesive compositions based on butadiene-nitrile rubber as a filler mixture of lignocellulosic polydisperse fibrous material and a thermoplastic derivative of cellulose (ethyl cellulose) can improve the strength of bonding of various substrates ~ 40%; and improve the thixotropic properties of adhesive is applied and distributed on the surface of the substrate.

Adhesive composition based on butadiene-nitrile rubber containing phenol-formaldehyde resin, PVC resin chlorinated or chlorinated isoprene rubber, zinc oxide, magnesium oxide, as a solvent which is the ethyl acetate, characterized in that the filler is a mixture of lignocellulosic polydisperse fibrous material and a thermoplastic derivative of cellulose (ethyl cellulose) in the following ratio of components, parts by weight:

The NBR100,0
Phenol-formaldehyde resin20,0-30,0
Resin chlorinated polyvinylchloride/
Chlorinated isoprene rubber10,0-30,0
Magnesium oxide2,0-5,0
Zinc oxide2,0-5,0
Filler5,0-20,0
Organic solvent200,0-500,0



 

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