SU602523A1 - Adhesive composition - Google Patents

Description

The hardener is ammonium chloride, oxalic acid.

The polyvinyl acetate dispersion facilitates the best combination of the cubic bed with urea formaldehyde resin,

VAT residue is a waste product of dimethyl terephthalate production and includes according to gas chromatography data:

Diphenyltricarboxylic acid and its trimeti, lovy ether 10

3,4-Benzocoumarin dicarboxylic acid and its dimethyl ester 15 Diphenyl dicarboxylic. acids and their dimeti-. Lovy ethers 20-25

Resins up to 20

Terephthalic acid and monomers terephthalate2-3

Dimethyl terephthalate 8-10 Dimethyl isophthalate 3-4

1G -Toluic acid1 2 Methyl ester of P -toluic acid1 2 P-Formyl benzoic acid and its ester 7-8 Methyl ester of benzoic acid 0.2-0.5 Characterization of the cubic residue:

softening temperature, ° С

0 + 3

Types of testing

specific weight (20 ° С)

1,223

carboxyl content

groups,% 0.88-1.0

acid number,

mg KOP / G 10.9-12.7

the number of saponis

mg KOH / G470-490

The introduction of the bottoms in the urea-formaldehyde resin and the preparation of the adhesive composition are carried out in a mortar mixer.

Example 1. 8.4 g (15%) of the bottom residue DMT is dissolved in 4.5 g (8.0%) of benzene and ethyl acetate in a 1: 1 ratio. 5.0 g (9.0%) of the PVA dispersion and 2.7 g (48.5%) of the urea-formaldehyde resin and 1., 1 g (2.0%) of ammonium chloride are added to the solution and all is thoroughly mixed. To the resulting solution was added 9.8 g (17.5%) of kaolin and stirred again, until a homogeneous mass was obtained.

Example 2. 16.5 g (Ju-o of the foreign residue was dissolved in 16.5 g (30%) of benzene and ethyl acetate in the ratio 1: 1, 1.2 g (2.1%) of the PVA dispersion was added to the solution, and 17 , 5 g (31.5%) of urea-formaldehyde resin and 0.6 g (1.0%) of ammonium chloride and mixed thoroughly. To the resulting solution, add 3.0 g (5.4%) of kaolin and mix it again to homogeneous mass.

Samples of mineral wool are bonded to ceramics with the obtained glue. The test results are shown in the table.

The proposed composition according to the examples

Strength at 2

separation, kgf / cm: after curing after hardening at 100% moisture for 24 g

Viability of glue at a temperature of 22-23 0, min

Gelation time at temperature, s

Elasticity (elongation), mm

3.5

5.7

0.60

5.2

320

320

340

51

36

Claims (2)

41 From the table it can be seen that with the introduction of 15% of the bottom DMT residue into the carbide glue, when tested in 100% humidity for 1 day, the strength of the adhesive film decreases by 40%, and with the introduction of the bottom residue 30%, the strength index decreases only by 9%, when the carbamide glue loses 83-86% of its initial strength under the action of moisture for 1 day. The gelatinization time-measure is reduced with the introduction of the bottom residue of dimethyl terephthalate, which is very important in the production. Formula of the invention The adhesive composition comprising a urea formaldehyde resin, 50% unplasticized polyvinyl dispersion; in order to increase the moisture resistance and strength of the adhesive joint, it additionally contains a bottom residue from the production of dimethyl terephthalate with a softening temperature and carboxyl content x groups 0.88-1.0%, acid number 10.9-12.7 MIKON / G and saponification number 470-490 mg KOH / G in the following ratio, wt.%: Urea formaldehyde resin30-50 VAT residue of dimethylterephthalate production15 -30 50% unplasticized polyvinyl acetate dispersion 2-10 Hardener1-2 Filler5-20 SolventEverything, Sources of information taken into account during the examination: 1.Kardashov DL. Synthetic adhesives, M ,, Himi, 1976, p. 76. 2. Encyclopedia of Polymers, 1972, p. 945.