Thermoplastic elastomeric material

FIELD: chemistry.

SUBSTANCE: invention refers to rubber-processing industry, in particular to development of thermoplastic elastomeric rubber materials that can be used for manufacturing of various extrusion profiles and moulded flexible parts for automotive, cable, light industry and construction engineering. Thermoplastic elastomeric material is made of composition including, wt. fraction: rubber - 100, polyolefin - 2-150, vulcanising agent 1-15, vulcanisation activator 3-10, stearic acid - 0.75-2.0, oil - 25-500 and bulk additive - 1-100, modified diene-containing thermoplastic elastomer, such as hydrooxylated, halogenated, hydrogenated or hydrohalogenated dienevinylaromatic thermoplastic elastomer - 5-150, release agent - zinc stearate, calcium stearate or their mixture - 0.1-2.0. As oil additive the material contains paraffine-naphthene oils, as bulk additive is contains powder filler with particle size 100 nanometers to 20 microns, selected from the group: schungite, kaolin, chalk, talcum powder or carbon white, as well as mixed mineral additive with 0.04-4.0 mass % of industrial carbon. Thus as rubber thermoplastic elastomeric material contains ethylene-propylene-diene rubber with propylene chains 27 to 40 mass %, and as the third comonomer is contains ethylidene norbornene or dicyclopentadiene in amount 2-10 mass %, as well as butyl rubber, chlorbutyl rubber, brominated butyl rubber, polyisoprene rubber, butadiene-styrene rubber, or polybutadiene rubber. As polyolefin it contains isotactic polypropylene, polyethylene or their mixture at ratio of polyethylene mixed with isotactic polypropylene in amount of 5-95 mass %.

EFFECT: production of material possessing high technological and physical-mechanical properties, melt processability to products without vulcanisation by moulding under pressure or extrusion, low density, high fullness by oil.

5 cl, 2 tbl

 

The invention relates to the rubber industry, in particular to the development of thermoplastic elastomeric materials rubber-based, and can be used for the manufacture of various extrusion profiles and molded flexible parts used in the automotive, cable, light industry and construction.

Known thermoplastic elastomer composition based rubber containing a polyolefin, a vulcanizing system, a vulcanization activator, stearic acid, oil and filler (see U.S. patent No. 4130535 And NC 525/211, 1978).

However, the known thermoplastic elastomer composition during its use has the following disadvantages:

- insufficient melt flow index (5.8 g/10 min at a temperature of 210°and the load of 10.6 kgf), which leads to the loss of the ability to be processed by injection molding and extrusion,

- increased up to 1.2-1.3 g/cm3density

- narrow range of hardness manufactured products 61-91 srvc. unit shore a,

- insufficient capacity of the filling oil,

- low ultimate tensile strength and a large residual elongation after break.

The objective of the invention is the creation of a thermoplastic elastomeric material.

The technical result of using this proposed thermoplastic elastomeric material the material is a high complex technological and physico-mechanical properties, the ability to be processed into products from the melt without vulcanization molding or extrusion, low density, high capacity filling oil, as well as a wide range of hardness of products - from 35 to 95 srvc. unit shore A.

The technical result is achieved by the combination of the components of the proposed thermoplastic elastomeric material, and the proportion included in thermoplastic elastomeric material components.

The proposed thermoplastic elastomeric material made of a composition comprising rubber, a polyolefin, a vulcanizing system, a vulcanization activator, stearic acid, oil and filler, the rubber material contains a rubber selected from the group ethylenepropylene rubber with polypropylene links from 27 to 40 wt.%, containing as a third of the co monomer ethylidenenorbornene (ENB) or Dicyclopentadiene (DCPD) in an amount of 2-10 wt.%, as well as butyl rubber, herbalicious, bromobutyl rubber, branch, Rubezhnoe, Ukraine rubber, the best choice rubber or polybutadiene rubber, further comprises a modified diesterase a thermoplastic elastomer, such as gidrooksilirovania, halogenated, hydrogenated or hydrohalogenation dienvidosetijai thermoplastic elastomer, polyolefin contains from articheski polypropylene, polyethylene or a mixture, as antiadhesive contains zinc stearate, calcium stearate or a mixture, as oil contains paravinogradovite oil as filler contains powder filler with a particle size of from 100 nm to 20 μm, selected from the group of shungite, kaolin, chalk, talc or white carbon black, and a mixture of mineral filler from 0.04 to 4 wt.% technical carbon, with the following content of components, parts by weight:

rubber100
the specified polyolefin20-150
vulcanizing system1-15
the vulcanization activator3-10
stearic acid0,75-2
the specified filler1-100
the specified release agent0.1 to 2
specified modified
diesterase TPR5-150
specified oil25-500.

The content of polyethylene in his mixture of isotactic polypropylene selected from 5 to 95 wt.%. The vulcanizing system it contains sulfur, sulfur-accelerator, peroxide or resin curing system. In the resin C is theme as alkylphenolethoxylates resin using a resin based on p-tert-butylphenol or p-op. The content of calcium stearate in its mixture with the zinc stearate is selected in the amount of 20-80 wt.%.

Moreover, the content material is sulfuric vulcanizing system preferably selected from 2 to 6 mass parts, the ratio of the sulfur and vulcanization accelerator is preferably chosen from 1:1 to 1:8, and as the vulcanization accelerator is preferably used 2-mercaptobenzothiazole, di-(2-benzothiazolylthio), tetramethylthiuramdisulphide or sulfenamid C, and as a vulcanization activator is preferable to use zinc oxide.

The content material of the sulfur-vulcanizing accelerator system preferably selects from 4 to 8 mass parts, with a mixture of tetramethylthiuramdisuphide and dithiodimorpholine, and as a vulcanization activator while it is preferable to use zinc oxide. In sulfur-accelerator system use a mixture of tetramethylthiuramdisuphide and dithiodimorpholine when the content of dithiodimorpholine in its mixture with tetramethylthiuramdisuphide in the amount of 30-70 wt.%.

The content material of peroxide vulcanizing system preferably is chosen from 1 to 8 mass parts, while the use of peroxide of Dicumyl or peroxide di-tert-butyl, and as a vulcanization activator while it is preferable to use zinc oxide.

Soda is the content material of the resin vulcanizing system preferably selects from 4 to 15 mass parts, when this resin curing system consists of alkylphenolethoxylates resin in a mixture with 0.5 to 10 wt.% organic halogenated compounds selected from the group: hexachlorocyclo, polychloroprene, chlorosulphurized polyethylene, chlorinated polyethylene or polyvinyl chloride, and as a vulcanization activator contains a mixture of zinc oxide, tin, lead or cadmium chloride of the corresponding metal. The content in the resin vulcanizing system, a vulcanization activator of zinc chloride, tin chloride, chloride of lead or cadmium chloride in mixtures thereof with a suitable metal oxide selected from 5 to 95 wt.%.

Among the essential features characterizing the proposed thermoplastic elastomeric material, distinctive are:

content as rubber rubber selected from the group ethylenepropylene rubber with polypropylene links from 27 to 40 wt.%, containing as a third of the co monomer ethylidenenorbornene (ENB) or Dicyclopentadiene (DCPD) in an amount of 2-10 wt.%, and the use of butyl rubber, chlorobutyrate, bromobutyl rubber, composition of polyisoprene rubber, the best choice of rubber or polybutadiene rubber,

- the introduction of thermoplastic elastomeric material modified diesterase thermoplastic elastomer, t is anyone as gidrooksilirovania, halogenated, hydrogenated or hydrohalogenation dienvidosetijai TPR,

content as polyolefin isotactic polypropylene, polyethylene or a mixture when the content of polyethylene in his mixture of isotactic polypropylene in amounts of 5-95 wt.%,

- the introduction of thermoplastic elastomeric material as antiadhesive of zinc stearate, calcium stearate, or a mixture thereof at a content of calcium stearate in its mixture with the zinc stearate in the amount of 20-80 wt.%,

- quantitative content components, parts by weight:

rubber100
the specified polyolefin20-150
vulcanizing system1-15
the vulcanization activator3-10
stearic acid0,75-2
the specified filler1-100
the specified release agent0.1 to 2
specified modified
diesterase TPR5-150
specified oil25-500,

- use as a vulcanizing system sulfur, sulfur-accelerator, peroxide or resin systems is,

the content material of sulfuric vulcanizing system is preferably from 2 to 6 mass parts, the ratio of the sulfur and vulcanization accelerator is preferably selected from 1:1 to 1:8, and as an accelerator of vulcanization preferably using 2-mercaptobenzothiazole, di-(2-benzothiazolylthio), tetramethylthiuramdisulphide or sulfenamid C, and as a vulcanization activator, preferably using zinc oxide,

the content material of the sulfur-vulcanizing accelerator system preferably selected from 4 to 8 mass parts, used a mixture of tetramethylthiuramdisuphide and dithiodimorpholine, and as a vulcanization activator while it is preferable to use zinc oxide. In sulfur-accelerator system used a mixture of tetramethylthiuramdisuphide and dithiodimorpholine when the content of dithiodimorpholine in its mixture with tetramethylthiuramdisuphide in the amount of 30-70 wt.%,

the content material of peroxide vulcanizing system preferably selected from 1 to 8 mass parts, used peroxide of Dicumyl or peroxide di-tert-butyl, and as a vulcanization activator while it is preferable to use zinc oxide.

the content material of the resin vulcanizing system preferably selected from 4 to 15 mass the parts, when this resin curing system consists of alkylphenolethoxylates resin in a mixture with 0.5 to 10 wt.% organic halogenated compounds selected from the group: hexachlorocyclo, polychloroprene, chlorosulphurized polyethylene, chlorinated polyethylene or polyvinyl chloride, and as a vulcanization activator contains a mixture of zinc oxide, tin oxide, lead oxide or cadmium oxide with a suitable metal chloride. The content in the resin vulcanizing system, a vulcanization activator of zinc chloride, tin chloride, chloride of lead or cadmium chloride in mixtures thereof with a suitable metal oxide selected from 5 to 95 wt.%,

- the content of thermoplastic elastomer material as alkylphenolethoxylates resin resin resin system based on p-tert-butylphenol or p-op,

- use as oil prefinancing oil,

- use as filler mineral filler selected from the group: shungite, kaolin, chalk, talc or white carbon black, and a mixture of mineral filler from 0.04 to 4 wt.% technical carbon, the particle size of the powder filler is from 100 nm to 20 μm.

Experimental studies of the proposed thermoplastic elastomeric material showed it to be highly effective is here. It was found that the proposed thermoplastic elastomeric material is highly complex technological and physico-mechanical properties, ability to be processed into products from the melt without vulcanization molding or extrusion. This proposed a thermoplastic elastomer material has a low density, a sufficient occupancy of oil and a wide range of hardness made of it products - from 35 to 95 srvc. unit shore A.

Upon receipt of the proposed thermoplastic elastomeric material can be used EPDM, shungit with the content of propylene units from 27 to 40% and ethylidenenorbornene (ENB) or Dicyclopentadiene (DCPD) as the third monomer in an amount of from 2 to 10%, and oil-filled EPDM, shungit with a content of from 30 to 100 wt.% oil. When using oil-filled rubbers total amount of oil in thermoplastic elastomer composition should not exceed 500 parts by weight per 100 parts by weight of the elastomeric component of the ethylene-propylene-diene rubber.

As rubbers proposed a thermoplastic elastomer material contains ethylenepropylene rubber with polypropylene links from 27 to 40 wt.%, containing as a third of the co monomer ethylidenenorbornene (ENB) or Dicyclopentadiene (the JRS) in an amount of 2-10 wt.%, as well as butyl rubber, herbalicious, bromobutyl rubber, branch, Rubezhnoe, Ukraine rubber, the best choice rubber or polybutadiene rubber.

As polyolefins proposed a thermoplastic elastomer material contains isotactic polypropylene (GOST 26996-86), polyethylene (GOST 16338-85) or their mixture.

As the vulcanizing systems proposed a thermoplastic elastomer material contains sulfur system, sulfur, accelerator (sulfur + accelerators from class turangalila, thiazolo), peroxide system or resin (alkylphenolethoxylate resin with activators, donors halides or bromonaphthalene resin system.

As oil proposed a thermoplastic elastomer material contains paravinogradovite oil type domestic industrial oil I-20A, MP-75, nataksala, neveplast and foreign oil production type Sanpar 130, 150, Plaxen 1100, 6110, 25110, etc.

The proposed thermoplastic elastomeric material further comprises a modified diesterase a thermoplastic elastomer, such as gidrooksilirovania, halogenated, hydrogenated or hydrohalogenation dienvidosetijai TPR.

As a powder mineral filler proposed a thermoplastic elastomer material contains shungite is Olin, chalk, talc or white carbon, or a mixture of technical carbon.

Proposed a thermoplastic elastomer material and articles thereof of the wide nomenclature is obtained by mixing the components in the extruder-reactor Rheomex PTW 25/42 (L/D=42, D=25). In the power zone of the extruder-reactor at a temperature of 30°and the frequency of rotation of the augers 60-250 min-1introducing a mixture of crushed ethylene-propylene-diene rubber and polyolefin granules and carry out the mixing at 170-180°C. the resulting mixture granularit and mixed with bienvenidamarisol a thermoplastic elastomer, filler, oil, and a mixture of powdered vulcanizing agent, zinc oxide and stearic acid. The process of dynamic vulcanization is carried out in an extruder-reactor at a temperature of 210-270°in the fourth, fifth and sixth zones of the extruder simultaneously with the process of mixing the components of the composition. The duration of the process of dynamic vulcanization is 1-3 minutes

Table 1 presents the experimental formulations proposed a thermoplastic elastomer material, while table 2 presents the standard characteristics of the material.

Control strength was carried out in accordance with GOST 15140-78.

The technology components of the proposed thermoplastic elastomeric material is standard is Oh, does not require the use of specific technological equipment and includes the processes that are conventional in the manufacture of rubber compounds: crushing, weighing, mixing, etc. and then the production of the material and its products using the methods of extrusion, injection molding and other

Thus, the proposed thermoplastic elastomeric material has advantages compared with the known thermoplastic elastomer material of the same purpose.

1. Thermoplastic elastomeric material made of a composition comprising rubber, a polyolefin, a vulcanizing system, a vulcanization activator, stearic acid, oil, and a filler, characterized in that it as a rubber contains a rubber selected from the group: ethylenepropylene rubber with polypropylene links from 27 to 40 wt.%, containing as a third of the co monomer ethylidenenorbornene or Dicyclopentadiene in the amount of 2-10 wt.%, as well as butyl rubber, herbalicious, bromobutyl rubber, branch, Rubezhnoe, Ukraine rubber, the best choice rubber or polybutadiene rubber, further comprises a modified diesterase a thermoplastic elastomer, such as gidrooksilirovania, halogenated, hydrogenated or hydrohalogenation dienvidosetijai thermoplastic elastomer, polyolefin contains the isotactic thermoplastic elastomer, polyolefin contains isotactic polypropylene, polyethylene or a mixture thereof, optionally as antiadhesive contains zinc stearate, calcium stearate or a mixture, as oil contains paraffin is artenova oil, as filler contains powder filler with a particle size of from 100 nm to 20 μm, selected from the group of shungite, kaolin, chalk, talc or white carbon black, and a mixture of mineral filler from 0.04 to 4.0 wt.% technical carbon, with the following content of components, parts by weight:

rubber100
the specified polyolefin20-150
vulcanizing system1-15
the vulcanization activator3-10
stearic acid0,75-2,0
the specified filler1-100
the specified release agent0,1-2,0
specified modified
diesterase TPR5-150
specified oil25-500

2. Thermoplastic elastomeric material according to claim 1, characterized in that the content of polyethylene in his mixture of isotactic polypropylene selected from 5 to 95 wt.%.

3. Thermoplastic elastomeric material according to claim 1, characterized in that as a vulcanizing system it contains sulfur, samostoiatelnoe, peroxide or resin curing system.

4. Thermoplastic elastomeric material is according to claim 3, characterized in that the resin system as alkylphenolethoxylates resin used resin-based n-tert-butylphenol or n-op.

5. Thermoplastic elastomeric material according to claim 1, characterized in that the content of calcium stearate in its mixture with the zinc stearate is selected in the amount of 20-80 wt.%.



 

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