JPS59219355A - Chlorinated polyethylene composition - Google Patents

Abstract

PURPOSE:To provide the titled rubbery compsn. which has excellent wear resistance and contains a large quantity of a fibrous material well dispersed therein, by blending a fibrous material, an inorg. filler and other additives with a chlorinated polyethylene contg. a tackifier. CONSTITUTION:100pts.wt. chlorinated polyethylene having an MW of 50,000- 70,000 and a chlorine content of 20-50wt%, 5-70pts.wt. inorg filler, e.g. carbon black having a specific surface area of 600-1,200m<2>/g, 10-100pts.wt. natural and/or synthetic fibrous material, e.g. cellulose fiber or glass fiber having a length of 0.1-50mm. and a diameter of 0.1-30mu, 0.5-10pts.wt. tackifier and/or coupling agent, e.g. cumarone/indene resin or vinyltrichlorosilane, 0.5-15pts.wt. dehydrochlorination inhibitor, e.g. tribasic lead sulfate) and 0.1-20pts.wt. org. peroxide, e.g. dicumyl peroxide, are blended together.

Description

DETAILED DESCRIPTION OF THE INVENTION Objects of the Invention The present invention relates to compositions based on chlorinated ethylene, mineral fillers and natural and/or synthetic fibrous materials. More specifically, (A) chlorinated polyethylene, (B) inorganic filler, (C) natural and/or synthetic fibrous material, (DJ tackifier and/or coupling agent, (E) vinyl chloride thread polymer) The present invention relates to a chlorinated polyethylene composition comprising a dehydrochlorination inhibitor and an organic peroxide K (F), and the object thereof is to provide a composition having excellent wear resistance.

BACKGROUND OF THE INVENTION Prior to the invention, thermoplastic elastomers have been used as lubricants, fillers, anti-aging agents, plasticizers, vulcanizing agents, vulcanization accelerators, vulcanization accelerators, and
Products using rubber elastic compositions obtained by adding additives such as crosslinking agents, crosslinking aids, glass powder, cellulose acrylate, heat treatment, vulcanization or crosslinking, i.e. rubber products, are safe and secure for automobiles. It is well known that it is used in many parts and other components, and greatly contributes to maintaining and improving the performance of automobiles.

However, with recent trends in the automobile, Caterpillar and special vehicles (e.g. bulldozers), industrial products, and marine industries, structural improvements have been made. Rubber products used in the above fields require materials with even higher performance (higher properties) than the most important properties such as abrasion resistance, cold resistance, bending resistance, oil resistance, and sealing resistance. has been done. Thermoplastic elastomer with high performance in these properties [
For example, silicon-containing rubbers (silicon rubber, epichlorohydrin rubber, urethane rubber, fluorine-containing rubber) have problems in processability and cost. Although thermoplastic elastomers have no problem in terms of price, they have poor heat resistance and weather resistance because they have double bonds.

For this purpose, anti-aging agents, antioxidants, etc. are added, but not only do the anti-aging agents and antioxidants bleed, but all of the properties have advantages and disadvantages, and cannot always be said to be satisfactory. Furthermore, problems with individual thermoplastic elastomers that are commonly used will be discussed in detail.

Styrene-butadiene copolymer rubber (SBR) and acrylonitrile-butadiene copolymer rubber (NBR) have excellent oil resistance, cold resistance, and bending resistance, but because they have double bonds in their structure, they are weather resistant. Even if a relatively large amount of anti-aging agents, antioxidants, etc., which have good properties and ozone resistance are added, the long-term retention is poor. Furthermore, chloroprene rubber (CR) exhibits excellent oil resistance, cold resistance, and bending resistance. However, like SB'R and NBR, it has a double bond in its structure, so its weather resistance and ozone resistance are long-lasting even when relatively large amounts of antioxidants and antioxidants are added. Poor retention.

■ Structure of the Invention Based on the above, the present inventors conducted various searches to obtain a rubber-like material (elastomer) composition with excellent abrasion resistance. (A) 100 parts by weight of chlorinated polyethylene, ( B)
Inorganic filler 5-70 parts by weight (C1 natural and/or
or synthetic fibrous material 10 to 100 parts by weight, (DJ tackifier and/or coupling agent 0
．． 5 to 10.0 parts by weight, (E) 05 to 15.0 parts by weight of a vinyl chloride yarn combined dehydrochlorination inhibitor (hereinafter referred to as "dehydrochlorination inhibitor"), and (F) organic peroxide 0 It has been discovered that a chlorinated polyethylene composition containing .1 to 200 parts by weight is a rubber-like composition with good wear resistance, and the present invention has been achieved.

+1VI Effect of the invention Ethylene-propylene copolymer rubber (EPR), ethylene-propylene-diene ternary copolymer comb (EPDM) and chloro Sulfonated polyethylene has poor dispersibility with natural fibers and synthetic fibers. It is expected that the dispersibility of these fibrous materials will be improved by incorporating a tackifier and/or a coupling agent into these rubber materials. However, even if EPR, EPDM, and chlorosulfonated polyethylene are blended with a tackifier or a coupling agent, the dispersibility cannot be sufficiently improved when a relatively large amount of fibrous material is blended. On the other hand, they found that by using chlorinated polyethylene as the comb material, the dispersibility was excellent even when a relatively large amount of fibrous material was blended (added). It is thought that the anchoring effect is sufficiently exerted by the tackifier and the coupling agent, and poor dispersion will not occur even if a relatively large amount of fibrous material is blended.

The chlorinated polyethylene composition obtained by the present invention exhibits the following effects (characteristics).

(1) Excellent wear resistance.

(2) Good weather resistance.

(3) Excellent flexibility.

(4) Good oil resistance (aromatic oil, aromatic oil).

(5) Excellent flexibility and cold resistance.

(6) Good heat resistance.

(7) Good dimensional stability.

(8) It not only has excellent molding force and tightness, but also has a small shrinkage rate during molding.

(9) The most distinctive effect is that even if used for a long time under more severe conditions than general rubber compositions that are required to have good abrasion resistance, the abrasion resistance decreases very little.

The chlorinated polyethylene composition obtained by the present invention has the above-mentioned excellent effects and can be used in a wide variety of fields. Typical uses are shown below.

(1) Impellers for ships (2) O-IJ materials for aircraft and automobiles (3)
Backing materials for high-pressure and high-speed construction machinery and hydraulic machinery (4) Washer materials for automobile hydraulics, hydraulic machines, construction machinery, transportation machinery, etc. (5) Bellows sealing materials for washing machines (6) High-speed rotation and high temperature Sealing material that requires durability and wear resistance under certain conditions (7) Used in the undercarriage of vehicles related to construction machinery,
Mechanical seal material concave to prevent infiltration of sand, etc. Detailed description of the invention (A) Chlorinated polyethylene The chlorinated polyethylene used in the present invention is obtained by chlorinating polyethylene powder or particles in an aqueous suspension, or
Alternatively, it can be obtained by chlorinating polyethylene dissolved in an organic solvent (preferably, it can be obtained by chlorinating it in an aqueous suspension). Generally, amorphous or crystalline chlorinated polyethylene with a chlorine content of 20 to 50% by weight is used, and amorphous chlorinated polyethylene with a chlorine content of 25 to 45% by weight is particularly preferred.

The polyethylene is obtained by homopolymerizing ethylene or copolymerizing ethylene with at most 10% by weight of α-olefin (generally having at most 12 carbon atoms). Its density is generally 0910~0
．． It is 970i1cc.

Moreover, its molecular weight is 50,000 to 700,000.

In producing the composition of the present invention, only chlorinated polyethylene may be used, but other types of polymeric substances that are miscible with chlorinated polyethylene may also be blended. Examples of the polymer substances include ethylene-propylene-diene ternary thread copolymer rubber (EPDM), natural rubber, chloroprene thread rubber, chlorosulfonated polyethylene rubber, styrene-butadiene copolymer rubber (SBR), Rubbers such as acrylonitrile-butadiene copolymer rubbers (NBR), urethane rubbers, acrylic rubbers, and butadiene homopolymer rubbers [generally, Mooney viscosity (ML++4) is 10-150': ] can be given. In addition, other polymeric substances include the above-mentioned polyethylene, vinyl chloride resin (polymerization degree 400 to 1800) whose main component is vinyl chloride, methyl methacrylate resin whose main component is methyl methacrylate 1, and acrylonitrile. -Resinous materials such as styrene copolymer resins are mentioned. Regarding these rubber-like substances and resin-like substances, please refer to "Synthetic Rubber Handbook" edited by Kambara et al. [Asakura Shoten, 1939]
It is well known from works such as "Plastic Handbook" edited by Murahashi et al. (published by Asakura Shoten, 1962).

When blending these polymeric substances, the blending ratio is at most 50 parts by weight based on the chlorinated polyethylene.

(B) Inorganic filler In addition, the inorganic filler used in the present invention includes:
Its chemical composition is metals such as aluminum, copper, iron, silver, and alloys based on these, as well as aluminum oxide, its hydrates, aluminum silicate, antimony oxide, barium titanate, colloidal silica, calcium carbonate, and barium sulfate. , calcium sulfate, iron oxide, asbestos, carbon fiber, graphite, silica bar/l/-on, 7 lithium ash, lithium silicate, aluminum clay, mica, silica, silica, diatomaceous earth,
Silicon carbide, talc, asbestos, zirconium oxide, diconium silicate, molybdenum disulfide,
Examples include compounds such as titanium oxide and glass spheres, double salts, and mixtures thereof. The shapes of these inorganic fillers are broadly classified into powders (e.g. calcium carbonate), spheres (e.g. glass spheres) and tabulars (mica). Powder, tabular and spherical The size of the filler is preferably ITmn or less. In the present invention, among these inorganic fillers, carbon black and white carbon are most preferable. Carbon black generally has a specific surface area that does not allow for low-temperature nitrogen adsorption. 20 to 1,800 m measured by method and BET method
2/9 and the pore volume is 1.5 to 4.0 cc as measured by mercury intrusion method in the pore radius range of 30 to 7500 A.
/ 9, and especially the specific surface area is 600 to 1,200
m”/9 is valid.

Further, as white carbon (silica), one having a particle size of 10 to 50 millimeters is generally preferable. Moreover, those having a specific surface area of 100 to 250 m2/g are desirable, and those having a specific surface area of 100 to 20,027 g are particularly preferred. Furthermore, the specific gravity is usually 1.9-25.

These inorganic fillers are listed in Rubber Digest Co., Ltd., 11 Handbook, Rubber/Plastic Compounded Chemicals (Rubber Digest Co., published in 1972), pages 213 to 256, "Practical Handbook of Additives for Plastics and Rubber" [ Published by Kagaku Kogyo Shinbunsha, 1972] pages 489 to 62
It is described in detail on page 9.

(C) Fibrous materials Further, natural fibrous materials and synthetic fibrous materials used in the present invention include inorganic fibers such as glass fibers, graphite fibers, and asbestos fibers, polyester fibers, polyamide (nylon) fibers, cellulose (rayon) fibers, etc. ] fibers, synthetic organic fibers such as vinylon fibers and benbel fibers, and natural fibers such as cotton, linen and wool.

The length of these fibrous materials is usually 01 to 5 om,
Particularly preferred is 065-5wn. The diameter is generally 01 to 30 microns, preferably 1 to 20 microns. Furthermore, the particle size is 10 mesh to 5
One with 0 mesh is preferable. Among these fibrous materials, glass fibers, cellulose fibers and graphite fibers are preferred. Furthermore, those fibrous materials that have been previously treated with a coupling agent (for example, methoxylan-treated products, mercaptosilane-treated products) can also be preferably used. These fibrous materials may be used as they are, but depending on the intended use of the resulting composition, miscible natural fibrous materials, flakes made from finely divided synthetic fibrous materials, and powdered materials may be blended. can also be used. When these flakes and powders are blended, the blending ratio is at most 70 parts by weight per 100 parts by weight of the total amount of natural fibers and synthetic fibers.

(D+ Tackifier and coupling agent In the present invention, the tackifier is a tackifier that is generally used to improve the caking and dispersion properties of fillers or to increase adhesive properties. Typical examples of tackifiers include coumaron-indene resins produced by polymerizing coumaron, indene, styrene, etc. contained in coal tar, phenol/terpene resins, and petroleum hydrocarbons. Examples include resins and rosin derivatives.The types and physical properties of these tackifiers are described in detail on pages 129 to 144 of the above-mentioned "Handbook of Rubber and Plastic Compounded Chemicals."

Further, examples of the coupling agent include a silane coupling agent and a titanium coupling agent. As a typical example of a silane coupling agent, its general formula is CI)
A typical example of a titanium coupling agent is one represented by the formula (n1).

(RO)3-3i-R' (I)(n1
In the formula and (111 formula), the RO group has 1 to 5 carbon atoms.
R' is a functional group such as an alkoxy group or an acetoxy group that produces a silano group by hydrolysis of
W′ is an organic functional group that has an affinity with resins and is reactive, such as a vinyl group, an epoxy group, or a mercapto group having 1 to 5 carbon atoms, and W′ has at most 40 carbon atoms. A hydrocarbon group (which may have a substituent), A and B may be the same or different, -0COR', -08
02R2, -0PO('0H)OPO-(OR3)2
! TAHA-OR" (TA/DOSI, RI, R2, R3 and R4 may be the same or different, and the number of carbon atoms is at most 4.
0 hydrocarbon groups), m and n are integers from 0 to 3, but /! -1-m-)n is 4.

These coupling agents are commonly used as agents for methoxysilane treatment, ethoxysilane treatment, mercaptosilane treatment, and titanium treatment. Typical examples of the coupling agent include vinyltritalolosilane, γ-
Chloropropyl trimethoxysilane, γ-metachloroglopyltrimethoxysilane, r-aminopropyltriethoxysilane, isopropyl tristearoyl titanate, isobrobyl tridecylbenzenesulfonyl titanate-1, isopropyl tris (dioctyl pyrophos) Examples include phate titanate 1., bis(dioctylpyrophosphate) oxyacetate titanate, and the like.

(E) Dehydrochlorination inhibitor Furthermore, the dehydrochlorination inhibitor used in the present invention generally prevents dehydrochlorination of polymers containing halogen atoms (mainly chlorine atoms), such as vinyl chloride polymers, caused by heat or the like. It is widely used to prevent hydrogen chloride. The dehydrochlorination inhibitors are broadly classified into metal soaps, inorganic acid salt metal compounds, organic tin compounds, and pure organic compounds.

Among these, typical examples of metal soaps include metal salts of organic carboxylic acids having 1 to 10 carbon atoms (which may be substituted with at most 3 chlorine atoms). Such metals include lithium, magnesium, calcium, strontium, barium, cadmium, aluminum and lead.

Other metal soaps include lead salts of carboxylic acids such as tribasic maleic acid, dibasic phthalic acid, and salicylic acid. Examples of inorganic acid salts include alkylaryl cadmium phosphite, lead orthosilicate-silica gel coprecipitate, basic lead silicate, pentabasic lead sulfate, basic lead sulfite, and dibasic lead phosphite. It will be done. Among metal oxides, magnesium oxide is preferably used. Furthermore, examples of organic tin compounds include dibu, til tin dilaurate, octyl tin compounds, dimethyl tin compounds, dibutyl tin malate, sulfur-containing organotin compounds, stannane diol derivatives, and dibutyl tin compounds.
-C-tin-β-mercaptogulono9noate. Examples of pure organic compounds include chelating agents [the general formula is shown in formula (III)] and epoxy compounds.

In the fm1 formula, R5, R6, and R7 may be the same or different, and are hydrocarbon groups having at most 20 carbon atoms.

Furthermore, other dehydrochlorination inhibitors include stearoylbenzoylmethane and balmitoylbenzoylmethane.

These dehydrochlorination inhibitors are described on pages 266 to 319 of the above-mentioned 11 Handbook, Rubber/Plastic Compounded Chemicals. Among these dehydrochlorination inhibitors, inorganic acid salts and metal oxides and organic tin compounds are preferred, and inorganic acid salts and metal oxides are particularly preferred.In particular, dibasic lead phthalate, dibasic lead stearate, basic lead sulfate, basic lead silicate, magnesium oxide and Lead oxide is preferred.

(F) Organic peroxide The organic peroxide used in the present invention is not particularly limited, but it is particularly desirable to have a decomposition temperature (temperature at which the half-life is 1 minute) of 120'C or higher. , especially 14
A temperature of 0°C or higher is preferable.

Representative examples of suitable organic peroxides include peroxides such as 1,1-bis-tert-butylperoxy-3,3,5-)limethylcyclohexane, 2,5-dimethylhexane-2, Hydroperoxides such as 5-sibide loba-oxide, 2,5-dimethyl-2,5
Mention may be made of peroxy esters such as -di-sec-butylperoxyhexane, diacyl peroxides such as benzoyl peroxide, and dialkyl peroxides such as dicumyl peroxide.

Furthermore, polyfunctional substances such as triallyl isocyanurate and triallyl isocyanurate, which are commonly used as crosslinking aids in the rubber field, may be blended.

(G) Composition ratios The composition ratios of other compounding components to 100 parts of chlorinated polyethylene (including other rubber-like substances and/or resin-like substances, if they are included) are as follows.

The composition ratio of the inorganic filler is 5 to 70 parts by weight, and 5 to 6 parts by weight.
0 parts by weight is preferred, and 10 to 50 parts by weight is particularly preferred. If the composition ratio of the inorganic filler to 100 parts by weight of chlorinated polyethylene is less than 5 parts by weight, a composition with excellent wear resistance cannot be obtained.

On the other hand, if the amount exceeds 70 parts by weight, moldability is poor and it is difficult to obtain a uniform composition, and even if a molded product is obtained, it is not preferred because the flexibility is poor.

Furthermore, the composition ratio of the natural fibrous material and the synthetic fibrous material is 10 to 100 parts by weight as a total amount of these materials, and 12 parts by weight.
-100 parts by weight is desirable, particularly 15-80 parts by weight. If the total composition ratio of the natural fibrous material and the synthetic fibrous material to 100 parts by weight of chlorinated polyethylene is less than 10 parts by weight, a composition with good wear resistance cannot be obtained. On the other hand, if the amount exceeds 100 parts by weight, the dispersibility of these fibrous materials is not good even with the help of the tackifier or coupling agent.
It is difficult to obtain a uniform composition, and even if a composition is obtained, its flexibility is poor.

In addition, the composition ratio of the tackifier and the coupling agent is 0.5 to 100 parts by weight as the total amount thereof, and 0.5 to 100 parts by weight.
~70 parts by weight is desirable, and 160 to 70 parts by weight is particularly preferred. If the composition ratio of the tackifier and the coupling agent is less than 0.5 parts by weight based on the total amount of the tackifier and coupling agent relative to 100 parts by weight of chlorinated polyethylene, the dispersibility of the fibrous material is not good. On the other hand, when more than 100 parts by weight is added, the surface hardness of the resulting molded product increases, but the molded product not only becomes brittle but also has poor wear resistance.

Furthermore, the blending ratio of the dehydrochlorination inhibitor is i, o ~ 150
Parts by weight, particularly preferably 50 to 10.0 parts by weight.

Further, the blending ratio of the organic peroxide is 01 to 20.0 parts by weight, particularly preferably 1.0 to 100 parts by weight.

Furthermore, if a crosslinking aid is used, the proportion used is at most 100 parts by weight.

Furthermore, if the blending ratio of the organic peroxide is less than the lower limit, crosslinking will not proceed to completion and a good sealing material will not be obtained.

On the other hand, when the upper limit is exceeded, crosslinking progresses rapidly, making it difficult to obtain a product with a good shape, and also making it difficult to control crosslinking.

(6) Mixing method, molding method, etc. Although the composition of the present invention can be obtained by uniformly blending the above substances, fillers and plasticizers commonly used in the rubber industry and resin industry,
stabilizers against oxygen, ozone, heat and light (ultraviolet),
Additives such as lubricants and colorants may be added depending on the intended use of the composition.

Furthermore, when producing the composition of the present invention, the fibrous material and the tackifier and/or coupling agent may be treated in advance and the resulting product may be used, or the composition may be prepared without this treatment. It may be added during production.

When producing the composition of the present invention, the blending (mixing) method may be as follows: Mixing may be carried out using a mixer such as an open roll, a dry prenter, a Banbury mixer, or a Nigu mixer, which are commonly used in the technical field. Of these mixing methods, two or more of these mixing methods may be applied in order to obtain a more uniform composition (for example, after mixing in a dry blender, the mixture may be passed through an open roll. method of mixing).

The composition of the present invention may be molded into a desired shape using a molding machine commonly used in the rubber industry, such as an extrusion molding machine, an injection molding machine, a compression molding machine, or a calendar molding machine. In addition, in the rubber technology field, a method is generally used in which chlorinated polyethylene or the above-mentioned composition is added to produce molded products while vulcanizing (crosslinking), that is, a method in which vulcanization and molding are performed simultaneously is applied. It may be molded into a desired shape using a molding machine such as an extrusion molding machine, an injection molding machine, a compression molding machine, or a calendar molding machine, which are used for molding into a desired shape.

In addition, in the rubber technology field, a method is generally used in which chlorinated polyethylene or the above-mentioned composition is added to produce a molded product while vulcanization (crosslinking) is performed, that is, a method in which vulcanization and molding proceed simultaneously. It may be formed into a desired shape.

EXAMPLES AND COMPARATIVE EXAMPLES The present invention will be explained in more detail with reference to Examples below.

In addition, in the examples and comparative examples, heat aging test OJ
After leaving the JIS No. 3 dumbbells for 3 days during the JIS gear open with the temperature set at 120°C, using a Chopa type tensile tester, the tensile strength (hereinafter referred to as rT BJ) and elongation rate were measured. (hereinafter rEnJ
] and hardness (8 days) were measured, and the rate of change in TB and EB and Hs were determined.

In the abrasion resistance test, the amount of wear was measured in cc using an Akron type abrasion tester and a taper set abrasion tester under conditions of a load of 3 kg and a rotational speed of 1000 revolutions. Furthermore, the compression permanence test was carried out in accordance with JIS K-6301, the temperature was set at 120° C., and the strain value (correspondence) after being left for 3 days was measured. Furthermore, the grease resistance test was conducted using grease (manufactured by Mishikosan Co., Ltd., FCJ I S
A No. 3 dumbbell and a sample for volume change rate measurement were immersed, left for 5 days, and then measured in the same manner as in the heat aging test using the same measuring device. The rate of change in volume (hereinafter referred to as "△V") was measured using the Archimedes method.Furthermore, the engine oil resistance test was conducted using Toyoda genuine engine oil (20W-40-Gastle Sparklin-SD, ). Measurements were conducted under the same conditions as the grease resistance test.

In addition, the chlorinated polyethylene, inorganic filler, natural fibrous material, synthetic fibrous material,
The types and physical properties of the tackifier, coupling agent, organic peroxidant, and dehydrochlorination inhibitor are shown below.

[(A) Chlorinated polyethylene]

As chlorinated polyethylene, the density is 0.941.9/c
Chlorinated polyethylene obtained by chlorinating m3 of ethylene polymer (average molecular weight approximately 200,000) by an aqueous suspension method [chlorine content 40.2% by weight, unquality,
rcPE(A)J] and has a density of 0.936
Chlorinated polyethylene [chlorine content 302% by weight,
Crystalline 1-cpE (hereinafter referred to as B month) was used.

[(B) Inorganic filler]

Furnace black (manufactured by Showa Cabot Co., Ltd., trade name: Showblack N-2zo, particle size:
19-29 millimicrons, specific surface area 111-128
m27g, hereinafter referred to as ``c, B, J''] and dry method white carbon (manufactured by Nippon Aerosil Co., Ltd., trade name Aerosil 130, average particle size 16 mm, average specific surface area 130 mF7g, hereinafter referred to as ``WCBJ'') were used. .

[(C) Natural fibrous materials and synthetic fibrous materials] As fibrous materials, silane-treated glass fibers (average diameter 5 microns, average length 1 bleached, hereinafter referred to as GFJ), carbon fibers (average diameter 5 microns, average length 1 bleached), Micron, average length 1 basket, hereinafter referred to as "cFJ", polyamide fiber (average diameter 3 microns, average length 2 pieces, hereinafter referred to as FJ), titanium-treated glass fiber (average diameter 5 microns, average length , 1 m, hereinafter referred to as 1'-GF TJ).

[(D) Tackifier and coupling agent] Coumarone-indene resin (softening point 100-1
30° C., using r-mercaptoglopyltrimethoxysilane [hereinafter referred to as “compound (1)”] and isopyropyltridecylbenzenesulfonyl titanate [hereinafter referred to as “TACKl”] as a coupling agent. Hereinafter referred to as "compound (2)"] was used.

[(E) Dehydrochlorination inhibitor]

A tribasic sulfuric acid carrier (hereinafter referred to as "tribase") was used as a dehydrochlorination inhibitor.

[(F) Organic peroxide]

As an organic peroxide, dicumyl peroxide (hereinafter "
DCP) was used.

[(G) Crosslinking aid]

Triallylisocyanate (hereinafter referred to as 1'
-TAICJ] was used.

Examples 1 to 11, Comparative Examples 1 to 11 100 parts by weight of chlorinated polyethylene (type and compounding ratio are shown in Table 1), 10 parts by weight of tribase (as a dehydrochlorination inhibitor), 5 parts by weight of DCP (organic peroxide] and 3 parts by weight of TAIC (as a crosslinking auxiliary agent), as well as inorganic fillers, natural or synthetic fibrous materials, and tackifiers or coupling agents whose types and amounts are shown in Table 1. were thoroughly kneaded for 20 minutes using an open roll whose surface temperature was preset at 50°C to form a sheet [In Examples 7 to 9 and Comparative Examples 5 to 7 and 9, cPE(A) and CP E (B)
A mixture obtained by thorough kneading using an open roll whose surface temperature was previously set to 130°C was used. Moreover, in Comparative Examples 8 to 11, no tribase was blended].

Each mixture thus obtained was heated at a temperature of 170°C and a pressure of 200' Kg/cm2cr) for 15 minutes.
A sheet was created by hot pressing for a minute. Each sheet obtained was subjected to a heat aging resistance test, a grease resistance test, and an engine oil resistance test. In addition, the sheet obtained by the above mixing was hot pressed for 30 minutes under the same conditions as above to produce samples for compression set test and abrasion resistance test, and the tests were conducted respectively. The heat aging resistance test and the grease resistance test are shown in Table 2.

Furthermore, the results of the wear resistance test, engine oil resistance test, and compression set test are shown in Table 3. In addition, in these tables, TB and EB are rates of change (units are percent).
The output and output are shown as changes (units are points).

In Comparative Examples 8 to 11, dehydrochlorination occurred during sheet molding, and the sheet could not be manufactured.

From the results of the above Examples and Comparative Examples, the chlorinated polyethylene composition obtained by the present invention not only has excellent heat aging resistance, grease resistance, engine oil resistance, and compression set resistance, but also Since it has good abrasion resistance, it is clear that it is promising as a sealing material that requires abrasion resistance, a sealing material for industrial products, a backing material, a cap material, etc.

Patent applicant: Showa Denko Co., Ltd. Agent: Patent Attorney Sei Kikuchi

Claims (1)

[Claims] (A) 100 parts by weight of chlorinated polyethylene, (Bl
Inorganic filler 5 to 70 parts by weight, (C) Natural and/or synthetic fibrous material ] 00 to 100 parts by weight (D) Tackifier and/or coupling agent 0
5 to 10.0 parts by weight, (E) Dehydrochlorination inhibitor for vinyl chloride polymers 05
~15.0 parts by weight and (F) 01 to 200 parts by weight of organic peroxide.