SU667566A1 - Polymer composition - Google Patents

Description

one

The invention of ognosigs to crosslinked filled compositions based on low density polyethylene. Such compositions can be used as insulating and structural materials.

Known stitching with filled. a composition comprising low density polyethylene, kaolin, a peroxide lubricant agent and an antioxidant 1.

The preparation of such compositions allows reducing the polymer consumption, obtaining a material that is resistant to heat and organic solvents. Kaolin is one of the cheapest and most affordable mineral fillers. However, the compositions have high strain values when pushed under load.

The strain value is the percentage of the sample deformed when pressed under a load of 0.5 kgf at 20 ° C (TU 6-О5-1547-74). For successful operation and for prevention.

In the case of breakdowns, the insulating material must be deformed under these conditions by no more than 50%, and in some cases even less. Reducing the strain values cannot be achieved by increasing the concentration of the filler or crosslinking agent, since this sharply decreases the strength and increases the brittleness of the material.

Also known is a polymer composition containing low density polyethylene, a peroxide crosslinking agent, ter; a stabilizer, and 3,4-epoxy hexahydrobenzyl acrylate 2. However, this composition also has high values of extrusion during extrusion.

In order to reduce the deformation under pressure under pressure, the polymer composition containing low density polyethylene, kaolin, peroxide crosslinking agent and antioxidant, additionally contains 3,4-epoxyhexahydrobenzylacrh

Pat in the following ratio, wt.%:

Low density polyethylene59,5-86,7

Kaolin1O, OIZO, 0

3,4-Epoxyhexa-. hydrobenyl acryl T 2.0–7.0 Peroxide crosslinking agent, I, 0u2.5 Antioxidant Else Introduction 3.4–9 to 4 -hexyhexyl hydroxybenzene acrylate allows one to obtain a polymer composition with lower values while maintaining the same values of the other characteristics.

3,4-Epoxyhexahydrobenzyl acrylate can be obtained by epoxidation of tetrahydrobenzyl acrylate with an aqueous solution of peracetic acid,

1,3-dy- () n -butylperoxyisopropyl) -benzene peroxide can be used as aireHTa crosslinker, dicumyl peroxide and others can be used as

antioxidants - bis- (2-hydroxy-5-methyl-t / et- (butylphenyl) -methane (bisalkofan BP), l7N-di-JB-naphthyI-n-4enylenediam n and others.

Example 1. 86, 7 g of low density polyethylene, 1 O, 0 g of kaolin, 0.3 g of bisalcofen BP, 2.0 g of 3,4-epoxyhexahydrobenzylchrylate and 1.0 g of 1,3-di-β-butylperoxyisopropyl; -benzene are mixed at 11Q-12O С for IP min. After mixing, the composition is rolled with a gap of 0.5 mm 3 min with constant cutting of the web. The stitching is carried out in the mold according to the mode: temperature 170 ° C, time ZO min, Pressure 80 kgf / cm. ,

Examples 2-14. The composites are prepared and tested under the conditions of Example 1, but different components and varying amounts are used.

The compositions of compositions are given in table. 1, the results of their tests - in table. 2

T a b l i and a 1

Note. In the composition of the sample. 3 and 7 cross-linking agent dicumyl peroxide, antioxidant - N, N-di-β-4 tyl-α-phenylenediamine; in the remaining compositions, the mixing agent is 1,3-di-ret-butylperoxyisopropyl) -benzene, the antioxidant is bisalcofen BP.

Table 2