SU1235878A1 - Method of modifying mixtures of thermoplastic polymers which are incompatible with respect to thermodynamic characteristics - Google Patents

Description

The invention relates to a process for the production and processing of polymeric materials based on two thermodynamically incompatible polymers.

The goal is to increase the mutual dispersibility of thermodynamically incompatible polymers.

Example 1. High-pressure polyethylene (LDPE) and polystyrene (PS) in a ratio of 85:15 are simultaneously introduced into a Banbury mixer, mixed for 7.5 minutes at a temperature of 438-463 K, and then after they melt, highly dispersed additive - chalk, in the amount specified B table 1, and mixed for 7.5 minutes The mixture is then discharged from the mixer, rolled and crushed. Standard injection molding patterns are obtained on the injection molding machine. The temperature of the cylinder injection molding machine 443-463 K, the temperature of the mold 310-323 K.

From the obtained standard specimens, t. Slices are prepared, which are examined on a metallographic microscope. Physical and mechanical properties of casting

ABOUT

0.25 0.5 0.75 1

1.5 2 3 4 5 6

4.0

8.0

9.1

7,8

6

5.1

3.3

3.3

3.7

3.7

3.8

Output samples are determined by standard methods (Table 1).

Example 2. A mixture of high pressure polyethylene and polystyrene was prepared as in Example 1, but tuff was used as a highly dispersed mineral additive. The properties of the mixture with the introduction of tuff are given in table 2. Example 3. A mixture of polyethylene

high pressure and polyvinyl acetate (HDPE-PVA), taken in a ratio of 90:10, was prepared as in example 1, but calcite was used as a solid, highly dispersed mineral additive. The properties of the mixture LDPE-PVA are given in table 3.

Example A, For comparison, high-pressure polyethylene is mixed with polystyrene and chalk in a ratio (85: 15: 0.5) in the form of powders at 20 ° C and then melted. Samples of example 1 are prepared from the melt. The size of the polystyrene particles is 7.8-9.3 µm, which corresponds to

particle size in the unmodified mixture (Table 1).

Table

I.

130 320 340

330 310 250 270 237 210 190 170

75 600 725 675 650 590 525 430 375 300 250

95

97.5 100 100 100 100 100 100 102

97

97

table 2

2 3 4 5 6

4.1

4.5

five

5.3

5.8

Editor N.Egorova

Compiled by A. Kondratov

Tehred M. Khodanych Proofreader E. Roshko

Order 3059/22 Circulation 470 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Raushsk nab., d. 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Continuation tablZ

135 200 260 325 220

9.6 9.5 9.4 9.4 9.3

Claims (1)

A METHOD OF MODIFICATION OF MIXTURES OF THERMODYNAMIC INCOMPATIBLE THERMOPLASTIC POLYMERS by introducing low molecular weight substances, i.e., with the aim of increasing the mutual dispersibility of thermodynamically incompatible polymers, they melt into a mixture, which is 5 wt. I solid fine mineral additives. β £ co GO SP 00 h t