SU378393A1 - STABILIZED COMPOSITION BASED ON HOMO OR COPOLYMER OF VINYL CHLORIDE - Google Patents

Description

one

The invention relates to the field of processing. Plastic masses.

There are known stabilized compositions on the basis of homo- or copolymers of vinyl chloride and a stabilizing mixture consisting of salts of organic and / or inorganic acids and esters of bisphenols.

In order to increase the thermal stability and improve the color of the composition, as the esters of bisphenols, acrylic and methacrylic esters are added to it in an amount of 0.1-10% by weight of the polymer.

In addition, an epoxysopepia may be additionally added to the composition.

These additives cause a significant improvement in the initial color of PVC materials (from brown for vinyl plastic, stabilized with a mixture of tribasic lead sulfate and calcium stearate, to ivory with an addition of 4 parts by weight of diphenylolpropane dimethacrylic ester), and in the case of transparent materials - translucent .

In this case, an increase (2–3 times) in the thermal stability of the samples and an increase in their color fastness (when tested - materials in a circulating air oven) is observed.

The optimum working concentration of acrylic esters of bisphenols is 4-6 wt. hours per 100 weight. h PVC. The physical and mechanical properties of the material is not changed2

However, there is only a slight increase in tensile strength.

In tab. 1-5 presents the results illustrating the advantages obtained with the introduction into the composition of vinyl plastic acrylic esters of bisphenols in a mixture with different thermal stabilizers ..

All the studied acrylic and methacrylic esters of bisphenols, to a greater or lesser degree, also depending on their concentration and on the selected thermal stabilizer, increase the thermal stability of powdered PVC. This effect of the ester. Is also in -film-x, obtained from powder mixtures using the roller-pressing method. An improved initial color of materials is observed when adding. acridic esters to lead, calcium-zinc, organotin, barium-cadmium thermostabilizers. -

Increased thermal stability. The film is most pronounced on the system with di- or monomethacrylic ether. Of diphenylpropane and with diacrylic ether, diphenylolpropane. : -: For this case, when using lead thermostabilizers and calcium stearate as a lubricant, a sharp increase in thermal stability is characteristic of the plate size as compared to the porous skin:

composition (for example, without DMEDP in powder 66 minutes, in film 75.5 minutes; from 8 parts by weight. DMEDPP in powder 87 minutes, in film 212 minutes).

Acrylic and methacrylic esters of bisphenols increase the thermal stability of films to varying degrees, depending on the type

ether, and on the composition. The effect of increasing the thermoelectricity of the copolymer is smaller than that of PVC. However, in all cases, a significant improvement in the initial color of the films is observed, and only dimethacrylate ester of hydroquinone at high concentrations gives the fillers a grayish tint.

Table 1

Note to the table. 1. The processing mode for all compositions is similar. Mixing at a temperature of 70 for 35 ° C; milling at 155 ° C for 7 ms; roll gap 0.5 mm; compression at 170 ° C: duration of heating the material without pressure for 5 minutes, pressure 100 kg / sg

Note to the table. 2. Composition: PVC s-60 100 weight. h .; tribasic lead sulfate 2 wt. h .; secondary stabilizer.

Table 2 Note to the table. 3. Composition: PVC 100 arat lead 2 wt. h .; secondary stabilizer.

Note to the table. 4. Composition: PVC-50 103 weight. h .; barium stearate 2 ve .; h .; secondary stabilizer.

Table 5

Thermal stability at 175 ° C

compositions, weight. h on "Kongorot,

PVC

tribasic lead sulfate

Calcium stearate Diphenylolpropane dimethacrylic ester

PVC

Tribasic lead sulfate

Calcium stearate Diphenylolpropane diacrylic ester

VA-10

Tribasic lead sulfate

Calcium Stearate

Table 3

Table 4

Continued table. five

Thermal stability at

compositions, weight. h on "Kongorot, min min

BA-1010046,5

Tribasic C} lead lead 3 Calcium stearate 1

Diphenylolpropane di-methacrylic ester4

BA-1010053

Tribasic lead sulfate2

Calcium stearate 1 Diphenylolpropane diacrylic ester4

Note to the table. 5. Effect of diphenylpropane acrylic esters on the thermal stability of PVC films and copolymer of vinyl chloride and vinyl acetate (BA-10). weight. h .; dibasic step7 Subject of the Invention 1. A stabilized composition based on a homo- or sol-polymer of vinyl chloride and a stabilizing mixture consisting of o, pga-5 salts of nahic and / or inorganic acids and bisphenol ethers, in order to improve thermostability and improve The color of the composition is colored; acrylic and methacrylic esters are introduced into it as bisphenol ethers in an amount of 0.1--10% by weight of the polymer. 2. The composition according to claim 1, wherein an epoxy compound is further added to it.