RU2516491C1 - Method of obtaining adhesive compositions for sticky polyvinyl chloride tapes, which contains epoxidated 1,2-polybutadienes - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: adhesive composition includes perchlorovinyl resin, plasticiser and adhesiveness-increasing additive. Composition additionally contains epoxidated 1,2-polybutadiene or epoxidated syndiotactic 1,2-polybutadiene in quantity from 1 to 15 wt.p.; epoxidated 1,2-polybutadiene with average weight molecular weight from 8000 to 12000 being applied. Degree of epoxidation in epoxidated 1,2-polybutadiene consistitutes from 4 to 33%.

EFFECT: increased adhesion of sticky PVC-tape to metal surface.

3 cl, 11 ex, 1 tbl

Description

The invention relates to the field of production of adhesive compositions used for the manufacture of sticky polyvinyl chloride (PVC) tapes intended for gluing to various surfaces, and can be used for the manufacture of polyvinyl chloride adhesive tape intended for winding gas and oil pipelines as an insulating and protective coating, and also for repair work.

One of the main requirements for the adhesive for the manufacture of PVC tape is to ensure high adhesion of the resulting adhesive tape to the metal surface.

Known adhesive compositions used for the manufacture of adhesive PVC tapes containing perchlorovinyl resin, pine rosin, solvent and other ingredients [a.s. No. 4223829, cl. C09J 7/00, publ. 04/15/1974; A.S. No. 717118, cl. C09J 7/02, publ. 02/25/1980; RF patent No. 2196794, cl. C09J 127/24, publ. January 20, 2003].

The disadvantage of these adhesive compositions is the lack of adhesion of the obtained adhesive PVC tape to steel.

Closest to the proposed adhesive is adhesive for adhesive tapes [RF patent No. 2244729, class. C09J 127/24, publ. 01/20/2005], containing perchlorovinyl resin, plasticizer, pine rosin and filler, in the following ratio of components, parts by weight:

perchlorovinyl resin - 25-30;

dioctyl phthalate - 33-55;

chlorinated α-olefins - 11-33;

pine rosin - 6-8;

filler (activated mixture of natural zeolite and calcium oxide) - 0-7.

The disadvantage of this adhesive composition is the insufficient adhesion of the obtained adhesive PVC tape to the surface of the steel, the value of which does not exceed 5-6 N / cm, which does not correspond to modern technical requirements for adhesive tapes for insulation of pipelines.

The technical result of the invention is to increase the adhesion of sticky polyvinyl chloride tapes to steel.

The specified technical result is achieved in that the adhesive composition for sticky PVC tapes containing perchlorovinyl resin, plasticizer, pine rosin additionally contains epoxidized 1,2-polybutadiene or epoxidized syndiotactic 1,2-polybutadiene in an amount of from 1 to 15 parts by weight Use epoxidized 1,2-polybutadiene with a mass-average molecular weight of from 8,000 to 120,000, the degree of epoxidation in epoxidized 1,2-polybutadiene is 4-33%. The adhesive composition contains components in the following ratio, parts by weight:

perchlorovinyl resin - 25-30;

dioctyl phthalate - 45-55;

chlorinated α-olefins - 10-20;

pine rosin - 4-8;

epoxidized 1,2-polybutadiene or

epoxidized syndiotactic 1,2-polybutadiene - 1-15.

As a result of the introduction of epoxidized 1,2-polybutadiene into the adhesive composition, the adhesion of sticky polyvinyl chloride tapes to the steel surface is significantly increased.

Epoxidized 1,2-polybutadiene is obtained by the action of meta-chloroperbenzoic acid on 1,2-polybutadiene in toluene at a temperature of 20-50 ° C. The polymer is isolated from the reaction mass and dried.

The adhesive composition is prepared as follows.

45-55 parts by weight are loaded into a reactor heated to 70-75 ° C with stirring. dioctyl phthalate plasticizer, 10-20 parts by weight chlorinated α-olefins, 1-7 parts by weight 4-8 parts by weight pine rosin (brand "A" GOST 19113-84). After complete dissolution of the rosin, 25-30 parts by weight are added. perchlorovinyl resin PSX-LS and 1-15 parts by weight epoxidized 1,2-polybutadiene or epoxidized syndiotactic 1,2-polybutadiene and stirring is continued at a temperature of 70-75 ° C for 4-8 hours until a uniform adhesive composition is obtained.

The glue thus prepared is applied onto a polyvinyl chloride tape by a roller-calender method. The glue is prepared at the place of consumption immediately before application to the PVC tape. Samples for testing according to TU 2245-001-00203312-2003 are prepared from the obtained adhesive PVC tape. The value of adhesion of a PVC tape to steel is determined according to GOST R 51164-98.

The invention is illustrated by the following examples.

Example 1

In a reactor heated to 70-75 ° C, with stirring, load, parts by weight: DOP - 45: chlorinated α-olefins - 20; pine rosin - 6. After dissolving the rosin load 30 parts by weight perchlorovinyl resin and 10 parts by weight epoxidized 1,2-polybutadiene with a mass-average molecular weight of 84500 and a degree of epoxidation of 12.4% and stirred at a temperature of 70-75 ° C for 4-8 hours until a homogeneous adhesive mass is obtained. The glue thus prepared is applied to a polyvinyl chloride tape. The adhesion of the obtained adhesive PVC tape to steel is 10.1 N / cm.

Example 2

In the conditions of example 1 at the next load of the components, parts by weight: DOP - 55, chlorinated α-olefins - 10, rosin - 8, perchlorovinyl resin - 25, epoxidized 1,2-polybutadiene - 10. Mass average molecular weight of epoxidized 1,2 polybutadiene - 42800, the degree of epoxidation - 22.3%. The adhesion of the obtained adhesive PVC tape to steel is 10.4 N / cm.

Example 3

In the conditions of example 1, at the next load of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin - 28, epoxidized 1,2-polybutadiene - 1. Mass-average molecular weight of epoxidized 1, 2-polybutadiene - 17000, the degree of epoxidation - 28.2%. The adhesion of the obtained adhesive PVC tape to steel is 8.8 N / cm.

Example 4

In the conditions of example 1, at the next load of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin - 28, epoxidized 1,2-polybutadiene - 15. Mass-average molecular weight of epoxidized 1, 2-polybutadiene - 102600, the degree of epoxidation - 4.6%. The adhesion of the obtained adhesive PVC tape to steel is 10.2 N / cm.

Example 5

In the conditions of example 1, at the next load of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin - 28, epoxidized 1,2-polybutadiene - 6. Mass-average molecular weight of epoxidized 1, 2-polybutadiene - 8000, the degree of epoxidation - 7.2%. The adhesion of the obtained adhesive PVC tape to steel is 10.6 N / cm.

Example 6

In the conditions of example 1 at the next load of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin 28, epoxidized 1,2-polybutadiene - 9. Mass average molecular weight of epoxidized 1,2 -polybutadiene - 120,000, the degree of epoxidation - 17.3%. The adhesion of the obtained adhesive PVC tape to steel is 10.8 N / cm.

Example 7

In the conditions of example 1, at the next loading of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin - 28, epoxidized syndiotactic 1,2-polybutadiene - 9. Mass-average molecular weight of epoxidized syndiotactic 1,2-polybutadiene - 115,000, the degree of epoxidation - 19.4%. The adhesion of the obtained adhesive PVC tape to steel is 10.9 N / cm.

Example 8

In the conditions of example 1, at the next load of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin - 28, epoxidized 1,2-polybutadiene - 13. Mass average molecular weight of epoxidized 1, 2-polybutadiene - 9800, the degree of epoxidation - 4.6%. The adhesion of the obtained adhesive PVC tape to steel is 9.9 N / cm.

Example 9

In the conditions of example 1 at the next load of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin - 28, epoxidized 1,2-polybutadiene - 7. Mass-average molecular weight of epoxidized 1, 2-polybutadiene - 64300, the degree of epoxidation - 33.0%. The adhesion of the obtained adhesive PVC tape to steel is 11.1 N / cm.

Example 10

In the conditions of example 1, at the next loading of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin - 28, epoxidized 1,2-polybutadiene - 8. Mass-average molecular weight of epoxidized 1, 2-polybutadiene - 35700, the degree of epoxidation - 22.5%. The adhesion of the obtained adhesive PVC tape to steel is 11.8 N / cm.

Example 11 (boundary).

In the conditions of example 1, at the next loading of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin - 28, epoxidized 1,2-polybutadiene - 0.5. The mass-average molecular weight of epoxidized 1,2-polybutadiene is 7100, the degree of epoxidation is 33.0%. The adhesion of the obtained adhesive PVC tape to steel is 4.1 N / cm.

Example 12 (boundary).

In the conditions of example 1, at the next loading of the components, parts by weight: DOP - 54, chlorinated α-olefins - 12, pine rosin - 6, perchlorovinyl resin - 28, epoxidized 1,2-polybutadiene - 16. Mass-average molecular weight of epoxidized 1, 2-polybutadiene - 125000, the degree of epoxidation - 2.3%. The adhesion of the obtained adhesive PVC tape to steel is 4.0 N / cm.

Examples No. 11 and 12 are given as boundary for substantiating the selected intervals for the content of components in the adhesive composition and the characteristics of the epoxidized 1,2-polybutadiene used in the adhesive composition.

From the data of table 1 it follows that the adhesive compositions obtained using epoxidized 1,2-polybutadiene or epoxidized syndiotactic 1,2-polybutadiene, compared with the prototype, provide significantly higher adhesion of the adhesive PVC tape to steel.

Thus, the additional introduction of epoxidized 1,2-polybutadiene or epoxidized syndiotactic 1,2-polybutadiene allows to increase the adhesion of the adhesive PVC tape to steel.

Table 1 The results of experiments to obtain adhesive compositions Name prototype Example No. one 2 one four 5 6 7 8 9 10 eleven* 12* Perchlorovinyl resin, parts by weight 25-30 thirty 25 28 28 28 28 28 28 28 28 28 28 Dioctyl phgalate, mass parts 33-55 45 55 54 54 54 54 54 54 54 54 54 54 Chlorinated α-olefins, parts by weight 11-33 twenty 10 12 12 12 12 12 12 12 12 12 12 Pine rosin, parts by weight 6-8 6 8 6 6 6 6 6 6 6 6 6 6 Epoxidized 1,2-polybutadiene, parts by weight 10 10 one fifteen 6 9 - 13 7 8 0.5 16 Epoxidized syn-diotactic 1,2-polybutadiene, parts by weight - - - - - - - 9 - - - - - Mass-average molecular weight of epoxidized 1,2-polybutadiene - 84500 42800 17000 102600 8000 120,000 115,000 9800 64300 35700 7100 175,000 The degree of epoxidation in epoxidized 1,2-polybutadiene,% wt. - 12,4 22.3 28,2 4.6 7.2 17.3 19,4 4.6 33.0 22.5 33.0 2,3 Adhesion of adhesive PVC tape to steel. N / cm 5-6 10.1 10,4 8.8 10,2 10.6 10.8 10.9 9.9 11.1 11.8 2.2 4.0 * Examples No. 11 and 12 are given as boundary ones for substantiating the selected intervals for the content of components in the adhesive composition and the characteristics of the epoxidized 1,2-polybutadiene used in the adhesive composition.

Claims (3)

1. An adhesive composition for sticky PVC tapes containing a plasticizer, perchlorovinyl resin, pine rosin, characterized in that it contains epoxidized 1,2-polybutadiene in the following ratio by weight:
perchlorovinyl resin - 25-30
dioctyl phthalate - 45-55
chlorinated α-olefins - 10-20
pine rosin 4-8
epoxidized 1,2-polybutadiene - 1-15. 2. The adhesive composition according to claim 1, characterized in that the use of epoxidized 1,2-polybutadiene with an epoxidation degree of from 4 to 33% with a weight average molecular weight of from 8,000 to 120,000. 3. The adhesive composition according to claim 1, characterized in that instead of the epoxidized 1,2-polybutadiene, an epoxidized syndiotactic 1,2-polybutadiene can be used.