RU1775407C - Concentrate of antipyrenes - Google Patents

Abstract

Usage: the manufacture of slow-burning products for electronics, electrical engineering, television and radio engineering, construction products. SUMMARY OF THE INVENTION: a flame retardant concentrate, including an organohalogen flame retardant, a flame retardant synergist, contains divinyl styrene thermoelastoplast with a content of 25-35% of bound styrene at a certain ratio of components, 4 cpf, 2 tables

Description

The invention relates to polymer compositions, namely, a flame retardant concentrate based on high-impact polystyrene, used to obtain refractory compositions of styrene plastics, which can be used for the manufacture of refractory products for electronics, electrical engineering, television and radio engineering, construction products and other fields of national economy ystva.

A concentrate of flame retardants added to polyofins is known, consisting of a polyolefin as a binder, and the main components are an organic halide flame retardant, a synergist flame retardant (antimony oxides or sulfides, as well as Bi, As, Zn, Ti).

The disadvantage of this technical solution is the high processing temperature in the manufacture of the concentrate due to the low fluidity of the composition.

The closest in technical essence and the achieved result to the claimed invention is a flame retardant concentrate consisting of 45-55% block copolymer of styrene (50-80%) and alkadiene (50- 20%), 30-45% of organohalogen flame retardant ( brominated diphenyl ether C / 1 (DBDFO, OBDFO), flame retardant - synergies - f one hundred 10-25% antimony trioxide and 0.05-5% modifiers, including 0.05-0.15% antioxidant 3.

However, the disadvantage of the prototype is the high processing temperature at. the manufacture of the concentrate due to the fluidity of the j composition, which is based on the initial J styrene copolymer, to which OZ is impaired by reduced combustibility due to the introduction of this concentrate of flame retardants. This is also the reason for the low degree of filling of the concentrate with antipyrogenic additives (55-45%). The disadvantages include the production of a defective surface of styrene plastic due to the whitening effect and poor distribution of antimony trioxide in the polymer matrix. On the surface of the painted plastic, white point inclusions from agglomerates of unallocated antimony trioxide particles are observed that are not visible only on a white background or

when coloring material black. This is precisely what explains the production of the low-impact high impact polystyrene UPS 825TG in black or dark gray only.

The aim of the invention is to simplify the processing of concentrate flame retardants and technology for the production of slow-burning plastics based on concentrates of flame retardants, increase the fluidity of the melt, eliminating the whitening effect of the flame retardant synergist.

This goal is achieved in that the concentrate of flame retardants, including a halalogenorganic flame retardant, flame retardant synergist and block copolymer of styrene and alkodien, contains block styrene and alkodyene block copolymers in the following ratio of components, wt.%:

Organohalogen

fire retardant 25-55

Fire retardant synergist 10-25

Divinyl styrene

thermoplastic elastomer

Compounds of the following series or mixtures thereof, such as tetrabromodiphenylolpropzn, deca- or octabromodiphene oxide, can be used as the organohalogen antipyrec. tetrabromodmphenylolpropane diglycidyl ether or the product of its condensation with aniline; the product of the formation of 1,1-dichloro-2.2-di {chlorophenyl) eglen (redant-2). Compounds of the following series or AX mixtures of Sb20s-, Sn02 can be used as flame retardant.

The concentrate may further contain a blowing agent, for example, azodicarbonamide, calcium hydrogen carbonate, in an amount of 1, wt.%; various pigments of organic and inorganic nature in an amount of 0.005-5 wt.%, as well as thermal stabilizers, antioxidants, lubricants.

A distinctive essential feature of the claimed invention is the use of a vinyl styrene thermoplastic elastomer as a polymer binder in a flame retardant concentrate. This allows to significantly increase the degree of filling with flame retardants and other additives up to 80 wt.% While maintaining high melt flow of the composition, which makes it possible to process such a concentrate at 130-150 ° C (in contrast to 240-230 ° C for the prototype). Such a concentrate composition contains all functional additives (flame retardants, thermoplastic stoplight) in the ratios required for

obtaining styrene plastic of the required level of fire protection and a complex of physical and mechanical properties. Convenient in a technological sense, the form introduced in

additive polymers provides good dosing and transportation of the composition, the absence of separation of components (as in the case of combining polymer granules and powder additives), and, consequently, high stability of composition and properties, and no loss. In addition, the introduction of additives into the polymer through a concentrate of this composition gives a reduction in material and energy costs, preservation

5 strength properties of styrene plastic, because only one polymer processing is needed - directly in the manufacture of products by injection molding. Thus, we are talking about a significant improvement in the manufacturability of the production of slow-burning materials when using such a concentrate of flame retardants.

An unobvious factor when administered

5 flame retardants in the polymer through a concentrate based on thermoplastic elastomer there was no bleaching effect of antimony thioxide associated with defects on the surface of the plastic in the form of white point inclusions that do not allow plastics to be painted in different colors except white and black, as, for example, in case of slow-burning high-impact polystyrene UPS 825TG.

5 When antimony trioxides are introduced directly into the polymer, for example, impact-resistant polystyrene, due to poor compatibility, the flame retardant particles aggregate, resulting in

0 surface defects. When preliminary combining the flame retardant with thermoplastic elastomer, apparently, its distribution with the elastomeric matrix is significantly improved and, probably, we can talk about

5 the effect of microencapsulation, i.e. Having been introduced into the composition of the flame retardant concentrate in styrene plastic, antimony trioxide remains trapped in the elastomeric phase dispersed in the styrene matrix

0 plastic and due to this there are no surface defects.

Specific examples of the preparation of flame retardant concentrates and properties (combustibility and surface appearance)

5 low-combustible impact-resistant polystyrene based on them are shown in Table 1 below. 2. A concentrate of additives based on thermoplastic elastomer is prepared as follows:

powder components are mixed (halogen-free flame retardants,

flame retardant synergist, and also, if necessary, a blowing agent, pigments, thermostabilizers) in the required proportions;

the resulting mixture is mixed with crumb of thermoplastic elastomer and extruded, followed by granulation of strands into granules of 2-5 mm in size.

The flame retardant concentrate is mixed with high-impact polystyrene granules in a ratio of 1: 3-4.5 in a Z-shaped mixer and used directly for processing into products by injection molding at a temperature of 180-200 ° C.

Standard samples are prepared for flammability tests in accordance with UL-94 (vertical test - 94V, flame height 19 mm, double burning of the sample for 10 seconds from the bottom) in the form of plates 127 12.7 1.6 mm (for monolithic materials) and bars, 7 IO mm (for integral foams).

50 mm diameter discs are cast to visually assess surface quality. In order to better demonstrate the whitening effect of antimony trioxide, examples of red colored compositions are provided.

The melt flow rate (MFR, g / 10 min) is determined at 200 ° C and a load of 5 kg on an IIRT device, according to the standard method according to GOST 11645-73.

Claims (5)

1. A concentrate of flame retardants for styrene plastics, including an organohalogen flame retardant, a flame retardant synergist and a block copolymer of styrene and alkadiene, characterized in that, in order to simplify the processing technology and the technology for producing low-combustible plastics, increased -55 18-25 Rest no melt flow, excluding the whitening effect of the flame retardant synergist, as a block copolymer of styrene and alkadiene, it contains divinyl styrene thermoplastic elastomer with a content of 25-35% of bound styrene in the following ratio, wt.%: Organohalogen flame retardant Fire retardant synergist Divinyl styrene thermoplastic elastomer 2. The concentrate according to claim 1, with the exception that, as an organohalogen flame retardant, it contains compounds from the series: tetrabromodiphenylolpropane, tetrabromodiphenylolpropane diglycide ester, diglycidyl ether oligocondensation product tetrabromodi phenylpropane with aniline in a molar ratio of 1: 0.1-0.95, deca or octabromodiphenyl oxide, the product of bromination of 1,1-dichloro-2,2-di (chlorophenyl) ethylene or a mixture thereof. 3. The concentrate according to claim 1, with the exception that, as a flame retardant synergist, it contains compounds from the series or a mixture of them 5O2Oz. SHO, Sn02. 4. The concentrate according to claim 1, characterized in that, in order to obtain integral styrene foams, it further comprises a blowing agent in an amount of 1.5-5% by weight of the composition. 5. A concentrate according to claim 1, with the exception that, in order to color the styrene plastics in bulk, it additionally contains pigments in an amount of 0.005-5% by weight of the composition. Divinylstyrene ternoelastoplast with a content of (DST-30) 25-35 styrene-32 42 20 72 10 31 64 20 71 9 32 2526 32 26 25 29 24 30 SO - 40 35 Organohalogen flame retardant: ..