SU683210A1 - Polymeric composition - Google Patents

Description

(54) POLYMER COMPOSITION

one

 This invention relates to a composition of a polymer composition based on a mixture of polyvinyl chloride (PVC) and polymethyl methacrylate (PMMA) used, for example, to obtain a lighting, structural or decorative flame retardant material that can be injection molded, extruded or press-press.

Such a material must have a certain complex of properties: it must instantly fade out after being removed from the flame zone, have the minimum time for independent burning, be homogeneous (transparent), have sufficiently high physicomechanical properties and a HIGH dynamic thermal stability resource so that it can be processed without complications modern processing machines (injection molding and extrusion). The higher dynamic. thermostability

a processing machine can work more efficiently. It is known that the processing of a composition is considered POSSIBLE if its dynamic thermal stability is not less than 15 minutes and the higher it is, the greater the possibility of its processing.

A polymeric composition based on PVC, methyl methacrylate and stabilizer tlj is known.

Lead-tribasic sulfate is used as a stabilizer. However, the material obtained from such a composition has low lighting performance and therefore cannot be used in the lighting industry.

A transparent transparent impact-resistant composition of a mixture of PVC, PMMA and chlorinated polyethylene 2 is known.

However, such a composition has a low thermal stability (dynamic thermal stability of 1 I min) and insufficient fire resistance (the circumference of the sample goes out after 2-3 minutes after being carried out of the flame). Closest to the present invention is a composition containing polyvinyl chloride, polymethyl methacrylate, flame extinguisher — trichloroethyl phosphate, and stabilizer Z. The stabilizer is a mixture of the following composition, wt.%: Average lead salt of caproic acid 10-14 Average lead salt of enanthic acid 4-8 Average lead salt of pelargonic acid 0.5-1.5 Ethyl celloslose 40-60 Cyclohexane The Composition provides the lighting engineering material with self-absorption properties. However, the time of self-combustion of the samples was relatively fast (60–120 s), the light transmission was 40–50 and dynamic thermal stability was no longer than 1–2 min, i.e. The material can not be recycled by injection molding and extrusion methods. The purpose of the invention is to reduce r Tritiness, increase light transmission and dynamic thermal stability to the position. This is achieved by the fact that the polymer for a composition containing PVC, PM trichloroethyl phosphate and a stabilizer contains as a stabilizer a mixture of the following composition, parts by weight: Laurat barium and cadmium, taken in a ratio. 1: 2100 Glycerin 5-25 Zinc laurate1-3 Epoxidized soybean oil5-25 Diphenylolpropane1-3 cU, and) -Dimethacrylate- (bis-glyylene glycol) -phthalate0,5-5 Triphenylphosphite 6-12 Three (2-methylhexyl) phosphite 12-20 Alkylphenol0 2-2 Alkylphenol t bari 0.6-2 and the components of the composition are taken in the following ratio, wt%: Polyvinyl chloride35-47.5 Polymethyl methacrylate 35-47.5 Stabilizer1.8-3 Trichloroethylphosphate Else 04 Mixture 100 parts by weight bari barium cadmium (1: 2), 5-25 hours glycerol, 1-3 weight.h. zinc laurate, 5-25 weight.h. epoxidized soybean oil, 1-3 weight, h. diphenylolpropane and 0.55 n.s. O, L J-dimethacrylate- (bis-ethyleneGlycol) -phthalate is named LAST DP-4; a mixture of tri- (2-ethylhexyl) phosphite, triphenyl phosphite, alkylphenol and alkylphenol and barium, in appropriate quantities - J1ACT-A. The ratio of LAST DP-4 to LASTE-A is 5: 1-1: 1. The use of the stabilizing mixture in the polymer composition makes it possible to significantly increase the light transmittance and the dynamic thermal stability of the composition, the samples being instantly self-attenuating when removing them from the flame. The composition of the composition can also be introduced various opacifiers, dyes, bleach. L a r i me r 1. A mixture containing, wt%: 41 PMMA, 41 UBX, 16.2 trichloroethyl phosphate, 1.5 stabilizers. PAST DP-4- and 0.3 stabilizers LAST-A are granulated at 160-170 C and get samples by casting under pressure. at 160-180 ° C. The self-burning time of the samples was determined according to OST 1-90094-73 in seconds, light transmission according to GOST 978461 in percent and dynamic thermal stability in min. Dynamic thermostability is the time from the beginning of the kneading of the composition in the Prabender plastograph chamber at the time of the start of destruction, which is determined by the sharp increase in torque. The dynamic thermostability of the composition is determined as follows. A plastograph chamber of the firm Braender, heated to 75-180 ° C, is loaded with 45-50 g of the composition. Mixing is carried out until the moment of sharp increase of the torque fixed by the device. The time from the beginning of the kneading of the moment of a sharp rise in load is an indicator of the dynamic thermal stability. Example 2-4. The mode of preparation of the composition is similar to the example. In the composition used: in example 2: 1.6% LAST DP-4, 3, 4% LAST-A, 1.5% LAST D11-4, 0.5% AST-A, 4-2.0% LAST DP-4, 1.0% LAST-A, The table shows the properties of the present and known compositions.

Proposed

PVC 4

PMMA 41

Trichloroethyl Phosphate 16.2

LAST DP-4 1,5

LAST-A 0.3

PVC 41

PMMA 41

Trichloroethyl Phosphate 1 6

LAST DP-4 1,6

LAST-A 0.4

PVC 41

BMMA 41

Trnchloroethyl Phosphate 1 6

LAST DP-4 1, 5

LAST-A 0.5

P5X 41 PMMA 41

Trichloroethyl phosphate 1,5 LAST-DP 2 LAST-A 1

Famous

Claims (3)

1.Patent UK No. 98116, cl. SIR, pub. 1962. 2. Japanese Patent 14167/67, cl. 25 N, published. 1967. 3. USSR author's certificate number 371255, cl. From 08 L 27/06, 1971.