SU1740381A1 - Polymeric composition for coatings - Google Patents

Abstract

The invention: the composition contains 95.00-99.99% polyolefin and 0.01-5; 00% bis-bicyclo (2,2,1) -5-heptenamidoic acid. 2 tab. Yo

Description

The invention relates to the chemistry of polymers, in particular to polymeric compositions for protective coatings based on polyolefins — high pressure polyethylene (LDPE), low pressure polyethylene (HDPE) and polypropylene (PP), and can be used in mechanical engineering, instrument making, chemical industry and in other areas of the national household,

Known compositions based on polyethylene and organic peroxide - 3.3 6, 6, 9, 9, 12,12-octamethyl-1,2,7,8-tetraox-4 10-cyclodecadiene.

These compositions have high adhesion to copper, aluminum and iron. However, the coatings obtained on the basis of these compositions have insufficient

water resistant and peeled off the substrate after already 3 hours of boiling in water.

The closest to the essence and the achieved result to the proposed method is to increase the adhesion of polyolefins to metal substrates. According to this method, compositions are prepared consisting of a powdered polymer and a modifying additive — bis-male-amic acid.

These compositions have high adhesion to steel and aluminum, however, after boiling in water for 3 hours, the resulting coatings peel off,

The purpose of the invention is to increase the adhesion of polyolefin foils during operation in humid environments.

VI

ABOUT

with

00

This goal is achieved by the fact that an i-dimensional coating composition, including a polyolefin and a modifying additive, uses bis-bicyclo (2.2.1) -5-heptenamic acid as a modifying additive in the following ratio, wt.%:

Polyolefin95,0-99,99

bis-Bicycl (2,2,1) -5- heptenamido acid 0,01-5,0

The modifiers used are N, N-m-phenylene-bis-bicyclo (2,2,1) -5-heptenamido acid (MFGAC) and N, N, 4,4-diphenylmethane-bis-bicyclo (2,2,1) -5-heptenamic acid (DFMGAK) following chemical structure-1 nor

C-NH-Ar-HN-C,

s-he no

: well

where AG-T &G; ) -CH2-3

synthesized by the reaction of the corresponding aromatic diamine (m-phenylenediamine and 4,4-diaminodiphenylmethane) with bicyclo (2.2.1) -5-heptene-2,3-dicarboxylic anhydride in acetone. The bis-amic acid formed is insoluble in acetone and precipitates as a fine powder, which is easily separated by filtration. The structure of the synthesized bis-amido acids is shown by the methods of PC-spectroscopy and elementary analysis. MFGAC and DFMGAC have melting points above 350 ° C.

The high-pressure polyethylene used grade 16803-070 complied with the indicators established in GOST 16337-77.

Low pressure polyethylene grade 20906-040 complied with the indicators set in GOST 16338-87

Polypropylene grade 01020 complied with the indicators set in TU 6-05-1105-78.

The polymer composition is prepared by dry mixing the components. The process of forming coatings from the compositions proceeds in the temperature-time regimes used for the initial polymers. Coating is carried out on the heated surfaces of the samples by the method in a suspended layer or by sintering a layer of the composition on a metal substrate.

PRI me R 1. Powdered LDPE with a particle size of 50 mm µm is applied through

the stencil on aluminum foil grade A-99 (GOST 618-73) and steel tape 08KP (GOST 503-71) and melted in a heating cabinet at 225 ° C for 10 minutes. then cooled in air. The resulting coatings, 350-450 µm thick, are tested for adhesion strength before and after boiling in water, tensile strength, elongation, temperature

0 start of decomposition (temperature loss of 5% mass, TB).

PRI mme R 2. Powdered HDPE with a particle size of 300 µm is applied through a stencil to aluminum foil A-99 and

5 steel tape 08KP. The composition layer is melted in a heating chamber at 225 ° C for 10 minutes. Then, tests are performed on the values indicated in Example 1.

Example 3 Powdered poly0 propylene with a particle size of 50 mm µm was applied through a stencil on A-99 aluminum foil and 08KP steel tape. The powder layer was melted in a heating chamber at 250 ° C for 5 minutes. After air cooling

5 tests are performed on the indicators indicated in example 1.

The compositions of the proposed compositions, as well as known (the prototype) are given in table. 1. Forming coatings for these

0 compositions are carried out as described in examples 1-3.

Properties of coatings obtained on the basis of the starting polymers, the proposed compositions and known (according to the prototype),

5 are given in table. 2

Claims (1)

A polymer composition for coatings comprising a polyolefin and a modifying agent, characterized in that 0 in order to increase the adhesion of coatings to metal substrates when operating in wet environments, bis-bicyclo (2,2,1) -5-heptenamic acid 5 formulas (} () 0 Os l K N-LG-MN-C N. no-1 sleep II about li about Where Ar TS) G; - §HH2- 3} in the following ratio of components, wt.%: Polyolefin95,00-99.99 bis-bicyclo (2 2,1) -5heptenamidoacid 0, 01-5.00 Table 1 m-Phenylene-bis-maleamic acid; Prototype test cases Table2