Fire-resistant polymer composition and a product manufactured therefrom

FIELD: polymer materials.

SUBSTANCE: invention relates to incombustible, weakly foaming polybutylene terephthalate-based polymer composition, which can be used injection casting and extruding construction- and decorative construction-destination parts for motor cars, aircrafts, and other vehicles as well as in electrical engineering. Composition contains 79.5-91% polybutylene terephthalate, 4-10% decabromodiphenyl oxide or its mixture with antimony trioxide, 1-3% polytetrafluoroethylene, and additionally 4-15% modifier, in particular polyblock-structure block copolymer obtained by interaction of butanediol with oligotetramethylene oxide.

EFFECT: increased fire-resistant characteristics.

2 tbl, 5 ex

 

The invention relates to non-flammable Slobodyan polymeric compositions based on polybutylene terephthalate. The resulting composition can be used for manufacturing by injection molding and extrusion parts structural and decorative and structural purposes, used in cars and aircraft and other modes of transport, and electrical engineering.

Known flame-retardant molding composition containing polybutylene terephthalate, melamine (flame retardant) and barium sulfate (filler) (ASV USSR 1578158 ).

The disadvantages of the compositions are strong demovideo during combustion, low values of strain, including damping, properties, and lack of fire.

Known flame retardant polymer composition comprising polyalkyleneglycols, flame retardant thermo stabilizer, fiberglass filler and modifier epoxy resin (ASV USSR 1789533).

The disadvantages of the compositions are strong demovideo and high density.

Known flame-retardant polyester molding composition comprising a polyester (polybutylene terephthalate, polyethylene terephthalate), a flame retardant, a modifier, a stabilizer, a filler (Germany, application No. 19837701)

The specified polymer composition has a high Flammability, good deformation properties (does not contain Napo is the distributors), but it has a high smoke emission.

Products made from known polymer compositions do not provide the necessary level of fireproof properties due to high smoke emission.

Closest to the claimed composition adopted for the prototype, fire retardant polyester composition comprising, in wt.%:

Organohalogens retardant (preferably
aromatic brominated compounds - diphenyl
ether with 5-10 Aug, tetrabromobisphenol and others)1-40
PTFE with a particle size of 20-800 μm
(preferably 100-700 μm)0.01 to 5
The antimony trioxide1-30

per 100 wt.% polyester is mainly polybutylene terephthalate (U.S. patent No. 5194481).

The specified polymer composition has a high Flammability (SURDS= 29,3-30,1), good strength and deformation properties, but has a high smoke emission. Therefore, products made from the composition of the prototype, also do not provide the necessary level fireproof properties.

The technical object of the present invention is to develop a polymer HDMI is tion, providing fire safety (fire resistance and low demovideo) made of her products while maintaining a high level of physical and mechanical properties.

For the technical solution proposed:

Flame retardant polymer composition including polybutylene terephthalate, organohalogens fire retardant and polytetrafluoroethylene, which as organohalogen flame retardant contains decabromodiphenyl oxide or a mixture of antimony trioxide, and further comprises a modifier - block copolymers polyblock structure obtained by synthesis butanediol with oligotetramethyleneglycol with an excess of dimethyl terephthalate, in the following ratio, parts by weight:

Polybutylene terephthalate79,5-91
Decabromodiphenyl oxide or
his mixture of antimony trioxide4-10
The specified modifier4-15
Polytetrafluoroethylene1-3

and products made from the proposed flame-retardant polymer composition.

The mass ratio of butanediol and oligotetramethyleneglycol in the synthesis of blockcopolymer is 9:1.

The mass ratio of decabromodiphenylethane and trioxide of antimony which leaves 2:1.

As polytetrafluoroethylene proposed composition contains ultra-fine powder of PTFE with a particle size of 1-20 microns.

Reduction of smoke emission and maintenance of the physico-mechanical properties is achieved by introducing into the formulation of the proposed flame-retardant resin composition of the modifier is specified blockcopolymer and ultra-fine powder of polytetrafluoroethylene.

Modifier - block copolymers polyblock structure contains blocks of links formed by the exporter and butanediol, and links formed by the exporter and oligotetramethyleneglycol. Synthesis of blockcopolymer carried out with an excess of dimethyl terephthalate. The mass ratio of butanediol and oligotetramethyleneglycol can be any, but preferably the ratio of 9:1.

Modifier-block copolymers has a good affinity with polybutylene terephthalate, well combined with him in the melt is evenly distributed over the volume of the polymer and facilitates the crystallization of the latter without the occurrence of internal stresses.

The crystallization nuclei are particles of ultra-fine powder of polytetrafluoroethylene.

Uniform distribution of the modifier-blockcopolymer in the polybutylene terephthalate contributes to a more dense packing of the macromolecules of the latter, which reduces access to the Sloboda in volume of the polymer, and the highly developed surface of ultrafine particles (1-20 μm) powder of polytetrafluoroethylene contributes to the absorption of the products of combustion. All this leads to the reduction of smoke emission.

In the proposed polymer composition was used polybutylene terephthalate beyond 2226-001-45372259-98.

As organohalogen flame retardant can be used in a variety of halogenated compounds, but it is preferable to use decabromodiphenyl oxide (TU 2494-451-04872688-2003) or its mixture with antimony trioxide (TU 48-15-1-88). The ratio of decabromodiphenylethane and trioxide of antimony may be different, but the best technical result is achieved with a ratio of 2:1.

Ultradispersed polytetrafluoroethylene powder has a particle size of 1-20 μm (TU).

Of the proposed polymer composition can be obtained by the methods of injection molding and extrusion products such as housings of devices, details of passenger seats, profiles, fastening and other

Examples of implementation

Example 1.

Getting blockcopolymer.

In a reactor equipped with a heater and stirrer, download 177 g of dimethyl terephthalate, to 112.5 g of butanediol and 12.5 g of oligotetramethyleneglycol with a molecular weight of 1000. As the catalyst used tetrabutoxide, as thermo stabilizer - Irganox 1010 (phosphate inhibitor).

Synthesis of lead PR is the temperature of 150-200° With intensive stirring for 2 hours. In the first stage is the formation of oligomers with terminal butanediamine groups and Argonauts methanol.

Then raise the temperature to 245°and synthesis is carried out for 1.5-2 h in vacuum at a residual pressure of 1 mm Hg to a complete distillation of the excess butanediol.

Obtaining polymeric composition.

A mixture of 79.5 parts of polybutylene terephthalate (TU 2226-001-45372259-98), 5,0 by mass of decabromodiphenylethane, and 2.5 parts by weight of antimony trioxide, 10 parts by weight of blockcopolymer and 3 parts by weight of ultrafine polytetrafluoroethylene, thoroughly mixed in a mixer and fed into the hopper of the extruder, where the homogenized and made into pellets. Temperature of the extruder 200-230°zone nozzle 227 is±2°C. Samples for testing polymeric compositions are produced on a standard injection molding machine.

Of the proposed flame-retardant polymer composition according to example 1 were manufactured by the method of injection molding of test specimens in the form of discs (GOST 18616-80) and blades (GOST 11262-80). Extrusion of the composition according to example 1 were manufactured product - profile mounting.

Examples 2-5.

Obtaining a flame-retardant polymeric composition carried out analogously to example 1, but the ratio of the components shown in table 1.

Of the proposed fire is Taikai polymer compositions of examples 2-5 were produced samples in the form of discs (GOST 18616-80) and blades (GOST 11262-80). Method of injection molding of the compositions according to examples 2-5 were produced products - details of passenger seats, corps devices, switches, plugs and sockets.

Properties of flame-retardant polymer composition as compared with the prototype are shown in table 2.

Table 1
Name of the componentComposition, wt. including, by exampleThe placeholder
12345
Polybutylene terephthalate79,586,091,079,583,0100
Modifier
(block copolymers)10,07,04,015,05,0-
Organohalogens
fire retardant5,04,03,04,010,01-40
Antimony trioxide2,5- 1,52,0-1-30
Polytetrafluoroethylene3,02,01,02,02,00.01 to 5

Table 2
NameComposition, wt. ,, examplesThe placeholder
properties12345
Physico-mechanical properties
Density, g/cm31,361,351,351,351,41,45
Tensile strength at break, MPa636562586060
Elongation at break, %7810984
Fireproof properties
Combustibility
τOST/sub> with7898410-12
HProhorcm1,11,31,31,21,04,2
Demovideo
D2105110110105100>150
D4190195205195200250
Note: τOSTthe time residual combustion (smoldering) after exposure to the flame of a gas burner within 12 to be vertically spaced samples;

HProhor- the height of burn-out;

D2D4specific optical density of smoke for 2 and 4 minutes respectively (srvc. units).

Physico-mechanical properties of the compositions were determined by standard methods, Flammability - OST 1 90094-79, smoke developed - according to GOST 24632-81.

From table 2 it follows that the proposed flame-retardant polymer composition has reduced by 25-30% smoke emission compared to the prototype.

T is thus, we offer flame retardant composition combines low demovideo and Flammability along with high strength and deformation properties.

Products made from the proposed fire retardant polymeric composition, provide the necessary level fireproof properties.

1. Flame retardant polymer composition including polybutylene terephthalate, organohalogens fire retardant and polytetrafluoroethylene, wherein as organohalogens it contains flame retardant decabromodiphenyl oxide or a mixture of antimony trioxide and further comprises a modifier-block copolymers polyblock structure obtained by synthesis butanediol with oligotetramethyleneglycol with an excess of dimethyl terephthalate, in the following ratio, parts by weight:

Polybutylene terephthalate79,5-91
Decabromodiphenyl oxide or
his mixture of antimony trioxide4-10
Polytetrafluoroethylene1-3
Modifier4-15

2. Flame retardant polymer composition according to claim 1, characterized in that the mass ratio of butanediol and oligotetramethyleneglycol in the synthesis of blockcopolymer is 9:1.

3. Hognaston the I polymer composition according to any one of claims 1 and 2, characterized in that the mass ratio of decabromodiphenylethane and antimony trioxide in a mixture is 2:1.

4. Flame retardant polymer composition according to any one of claims 1 to 3, characterized in that as polytetrafluoroethylene it contains ultra-fine powder of PTFE with a particle size of 1-20 microns.

5. The product, characterized in that it is made of flame-retardant polymer composition according to any one of claims 1 to 4.



 

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FIELD: polymer materials.

SUBSTANCE: invention relates to incombustible, weakly foaming polybutylene terephthalate-based polymer composition, which can be used injection casting and extruding construction- and decorative construction-destination parts for motor cars, aircrafts, and other vehicles as well as in electrical engineering. Composition contains 79.5-91% polybutylene terephthalate, 4-10% decabromodiphenyl oxide or its mixture with antimony trioxide, 1-3% polytetrafluoroethylene, and additionally 4-15% modifier, in particular polyblock-structure block copolymer obtained by interaction of butanediol with oligotetramethylene oxide.

EFFECT: increased fire-resistant characteristics.

2 tbl, 5 ex

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