UA61419A - A polymeric composition - Google Patents

Abstract

A polymeric composition contains chloroprene rubber, zinc oxide, magnesium oxide, technical carbon, stearic acid. Additionally it contains naphtam and wax as stabilizer, expanded graphite as filler, D thiuram, altax as vulcanization accelerant, low molecular polyethylene as plastisizer, antimony trioxide, aluminum hydroxide, chloroparaffin as fire retardants.

Description

Description of the invention

The invention relates to the composition of high-molecular compounds, namely to the compositions of chloroprene polymers and 2. It can be used in the rubber industry for the production of thermally expanding material, which is used to increase the fire resistance of various surfaces and structures, such as profiles, plates and others.

The polymer composition based on chloroprene rubber, which contains a vulcanizing group (zinc oxide, magnesium oxide 70), a softener - stearic acid, and a filler - technical carbon, is the closest in composition to the polymer composition that is claimed and chosen as a prototype. (Handbook of the tire manufacturer.

"Khimiya" publishing house, Moscow, 1971, p. 89).

The disadvantage of the known polymer composition is that it is flammable, during burning it does not protect the structures it seals against the spread of flame.

The basis of the invention is the task of improving the polymer composition by changing the content and composition of 72 components, thanks to which it acquires fire-resistant properties and swelling properties that prevent the spread of flame.

The problem is solved by adding naphtha and wax as stabilizers, expanded graphite as a filler, thiuram D and altax as vulcanization accelerators, polyethylene low molecular weight as a plasticizer, antimony trioxide, aluminum hydroxide, chloroparaffin as flame retardants at this ratio of components, wt. h.:

Chloroprene rubber 100

Zinc oxide 4.5-5.5

Magnesium oxide 3.5-4.5 "

Technical carbon P-803 6.0-14.0

Stearic acid 1.5-2.5

Low molecular weight polyethylene 1.5-2.5

Oil 1.5-2.5 Me

Wax 1.5-2.5 "-

Graphite extended 28-32

Tiuram D 1-2 M

Altax 0.7-09 pcs

Antimony trioxide 4.5-5.5

Zo Chlorparaffin 18-22 i-oi

Aluminum hydroxide 28-32

According to the invention, the introduction of antimony trioxide, aluminum hydroxide, chloroparaffin as flame retardants and expanded graphite in the complex allows to obtain a polymer composition that swells and does not burn during combustion. 70 The introduction of naphtha and wax as stabilizers improves the resistance of the composition to various types of aging. 8 s The introduction of thiuram D, altax as vulcanization accelerators improves strength properties and

From" the heat resistance of the composition.

The role of the remaining components of the polymer composition is as follows. Chloroprene rubber of sulfur regulation is used as a polymer base, as a vulcanizing group - zinc oxide and magnesium oxide, as a filler - technical carbon P-803, as a softener - stearic acid and low molecular weight polyethylene. b The components of the polymer composition have the following characteristics - Chloroprene rubber of sulfur regulation (imported raw material) - a solid product with a Mooney viscosity of 45-55 um. unit e Zinc oxide (GOST 202-84) is a white powder with a density of 5.47 g/cm3 and Tpl. 18002S. - 30 Magnesium oxide (GOST 844-79) - powder with a density of 3.1 Zg/cm? and Tll. 28002S.

Ge Stearic acid is a white powder with a hardness of 692C and a density of 850-990g/cm.

Low molecular weight polyethylene (TU 6-05-1837-82) is a white solid product with Tl, 105"7С and a fragility of 9576. 5B Technical carbon P-803 (GOST 7885-86E) - a black powder with a specific adsorption surface of 10-20m 2/g » Naftam (GOST 39-79) - gray powder with Tll 10570.

Wax 38-1 (TU 38101564-80) - a homogeneous mass from light yellow to brown in color with T dl 50-55" with a density of 0.Og/cm3. 60 Thiuram D (GOST 7400-76) - white powder with Tll 10576.

Altax (GOST 7087-75E) - light cream-colored powder with Tl 17070.

Antimony trioxide (TU 48-14-1-82) is a white powder with a density of 5.2 g/cm3.

Chloroparaffin KhP-1100 (TU 6-01-597-81) is a white powder with a density of 1.65 g/cm.

Aluminum hydroxide (GOST 11841-78) is a white powder with a density of 2.42 g/cm3. for Expanded graphite (GOST 8295-73) is a black powder. -D-

Compositions of polymer compositions are given in table. 1.

Compositions are prepared on rollers Sm-Pd 800 550/550 according to the following mode, min.:

Rubber loading 0-5

Administration of magnesium oxide, stearic acid, altax, thiuram D 6-9

Introduction of technical carbon, graphite, low molecular weight polyethylene 10-13

Introduction of wax, naphtha, aluminum hydroxide, chloroparaffin, antimony trioxide 14-18

Cooling the rolls before applying zinc oxide 19-28 70 Introduction of zinc oxide 29-33

Mixture cut 34-3652

Vulcanizates are made at a temperature of 150-257 for 25-30 minutes.

The physical and mechanical properties of vulcanizates are determined according to the current GoStTs.

Properties of polymer compositions are given in table. 2.

The authors established that using flame retardants in doses of less than 55 wt. h. per 100 wt. parts of rubber (total amount), and expanded graphite in doses smaller than 30 wt. h. per 100 wt. parts of rubber, fire-resistant compositions cannot be obtained.

The use of flame retardants in doses greater than 55 wt. h. per 100 wt. parts of rubber, and expanded graphite in doses larger by mass. h. per 100 wt. part of rubber leads to the deterioration of the physical, mechanical and technological indicators of polymer compositions.

The use of other ingredients in quantities greater or less than specified in the formula of the invention does not lead to obtaining compositions with the necessary properties.

As can be seen from the table. 2, the invention makes it possible to obtain a polymer composition that does not burn, but swells and protects the structures that it seals from burning. "

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Claims (1)

The formula of the invention is a polymer composition containing chloroprene rubber, zinc oxide, magnesium oxide, carbon black, stearic acid, which is distinguished by the fact that it additionally contains naphtha and wax as a stabilizer, expanded graphite as a filler, thiuram D, altax as a vulcanization accelerator, low-molecular polyethylene as a plasticizer, antimony trioxide, aluminum hydroxide, chloroparaffin as flame retardants with this ratio of components, wt. h.: b5 chloroprene rubber 100 zinc oxide 4.5-5.5 magnesium oxide 3.5-4.5 technical carbon P-803 6.0-14.0 stearic acid 1.5-2.5 low molecular weight polyethylene 1, 5-2.5 naphtha 1.5-2.5 wax 1.5-2.5 expanded graphite 28-32 thiuram D 1-2 altax 0.7-09 antimony trioxide 4.5-5.5 chloroparaffin 18-22 715 aluminum hydroxide 28-32. Official bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2003, M 11, 11/15/2003. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. « (o) «- - «- |se) - and (o) -th Cheka" -th 20 ie) 60 b5