JPS6335176B2 - - Google Patents

Description

[Detailed description of the invention]

OBJECTS OF THE INVENTION The present invention relates to compositions based on chlorinated polyethylene, inorganic fillers and natural and/or synthetic fibrous materials. More specifically, (A) chlorinated polyethylene, (B) inorganic fillers, (C) natural and/or
or relating to a chlorinated polyethylene composition comprising a synthetic fibrous material, (D) a tackifier and/or coupling agent, (E) a dehydrochlorination inhibitor for a vinyl chloride polymer, and (F) an organic peroxide. The purpose is to provide a composition with excellent wear resistance. [] Background of the Invention For some time, thermoplastic elastomers have been used as lubricants, fillers, anti-aging agents, plasticizers, vulcanizing agents, vulcanization accelerators,
Vulcanization accelerator, crosslinking agent, crosslinking aid, glass powder,
Products using rubber elastic compositions obtained by adding additives such as cellulose acrylate, heat-treating, vulcanizing or crosslinking, i.e. rubber products, are used in many safety and security heavy parts of automobiles and other parts. It is well known that this technology greatly contributes to maintaining and improving the performance of automobiles.
However, in line with recent trends in automobiles, special vehicles with caterpillars (for example, bulltozers), industrial chemicals, and the marine industry, 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 elastomers with high performance in these properties [e.g., silicon-containing rubber materials (silicon rubber), epichlorohydrin rubber materials, urethane rubber materials,
Regarding the fluorine-containing rubber material], there are problems in terms of processability and cost. On the other hand, generally used thermoplastic elastomers have no problem in terms of price, but they have double bonds and therefore have poor heat resistance and weather resistance. For this purpose, anti-aging agents and antioxidants are added, but not only do the anti-aging agents and antioxidants bleed,
All characteristics have advantages and disadvantages, and cannot necessarily 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 the SBR and NBR mentioned above, it has double bonds in its structure, so it has good weather resistance and ozone resistance.Even if a relatively large amount of anti-aging agent or antioxidant is added, it can be retained for a long time. is inferior. [] Constitution of the Invention Based on the above, the present inventors conducted various searches to obtain a rubber-like material (elastomer) composition with excellent wear resistance, and as a result, (A) 100 parts by weight of chlorinated polyethylene, (B) Inorganic filler 5-70 parts by weight, (C) Natural and/or synthetic fibrous material 10-100
Parts by weight, (D) Tackifier and/or coupling agent
0.5 to 10.0 parts by weight, (E) Dehydrochlorination inhibitor for vinyl chloride polymers (hereinafter referred to as "dehydrochlorination inhibitor") 0.5 to 15.0
It has been discovered that a chlorinated polyethylene composition comprising 0.1 to 20.0 parts by weight of (F) organic peroxide is a rubber-like composition with good wear resistance, and the present invention has been achieved. [] Effects of the invention Ethylene-propylene copolymer rubber (EPR), ethylene-propylene-diene ternary copolymer rubber (EPDM) and Chlorosulfonated 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 coupling agent, the dispersibility cannot be sufficiently improved when a relatively large amount of fibrous material is blended. On the other hand, they have found that by using chlorinated polyethylene as the rubber material, the dispersibility is excellent even when a relatively large amount of fibrous material is blended (added). This means that the tackifier and coupling agent added sufficiently exhibit an anchoring effect, and even if a relatively large amount of fibrous material is blended, poor dispersion will not occur. 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, aliphatic oil). (5) Excellent flexibility and cold resistance. (6) Good heat resistance. (7) Good dimensional stability. (8) Not only does it have excellent moldability, but it also has a low shrinkage rate during molding. (9) The most distinctive effect is that even when used for a long time under harsher 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-ring materials for aircraft and automobiles (3) Packing materials for high-pressure and high-speed construction machinery and hydraulic machinery (4) Hydraulics for automobiles, hydraulic machinery, construction machinery, and transportation machinery Washer materials such as (5) Bellows sealing materials for washing machines (6) Sealing materials that require durability and abrasion resistance due to high-speed rotation and high temperature conditions (7) Used in the undercarriage of vehicles related to construction machinery. ,mud,
Mechanical sealing material that prevents infiltration of water, 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 by chlorinating polyethylene powder or particles in an aqueous suspension. 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, it is amorphous or crystalline chlorinated polyethylene whose chlorine content is 20 to 50% by weight, especially chlorine content of 25%.
~45% by weight amorphous chlorinated polyethylene is 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 between 0.910 and 0.970 g/cc. Also,
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. As the polymer substance, ethylene-
Propylene-diene ternary copolymer rubber (EPDM), natural rubber, chloropyrene rubber, chlorosulfonated polyethylene rubber, styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer rubber ( NBR), urethane rubbers, acrylic rubbers, and butadiene homopolymer rubbers [In general, Mooney viscosity (ML ₁₊₄ ) is
10 to 150]. In addition, other polymeric substances include the above-mentioned polyethylene, vinyl chloride resin (polymerization degree 400-1800) whose main component is vinyl chloride, methyl methacrylate resin whose main component is methyl methacrylate, and acrylonitrile-styrene copolymer resin. Examples include resin-like substances such as These rubber-like and resin-like materials are described in the "Synthetic Rubber Handbook" edited by Kambara et al. (Asakura Shoten, published in 1962), the "Plastic Handbook" edited by Murahashi et al. (Asakura Shoten, published in 1968), etc. It is well known. When these polymeric substances are blended, 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 metals whose chemical composition is aluminum, copper, iron, silver, alloys containing these as main components, aluminum oxide, and hydrates thereof. , aluminum silicate, antimony oxide, barium titanate, colloidal silica, calcium carbonate, barium sulfate, calcium sulfate, iron oxide, asbestos, carbon black, graphite, shirasu balloon, fly ash, lithium silicate, aluminum clay, mica, silica Examples include compounds such as silica, diatomaceous earth, silicon carbide, talc, asbestos, zirconium oxide, zirconium silicate, molybdenum disulfide, titanium oxide and glass bulbs, double salts and mixtures thereof. These inorganic fillers come in the form of powders (e.g. calcium carbonate), spheres (e.g. glass spheres) and platelets (e.g. mica).
It is broadly divided into The powder, plate-like and spherical materials preferably have a diameter of 1 mm or less. In the present invention, among these inorganic fillers, carbon black and white carbon are most preferred. Carbon black generally has a specific surface area of 20 to 1800 m 2 /g measured by low-temperature nitrogen adsorption method and BET method, and a pore volume of 20 to 1800 m ² /g and a pore volume of
Measured by mercury intrusion method in the range of 30 to 7500 Å
1.5~4.0cc/g, especially when the specific surface area is 600~
1200m ² /g is effective. In addition, white carbon (silica) generally has a particle size of 10
~50 millimicrons are preferred. Further, it is desirable that the specific surface area is 100 to 250 m ² /g, particularly preferably 100 to 200 m ² /g. Furthermore, the specific gravity is usually between 1.9 and 2.5. These inorganic fillers are described in "Handbook of Rubber and Plastic Compounding Chemicals" edited by Rubber Digest Co., Ltd. (published by Rubber Digest Co., Ltd. in 1972), pp. 213 to 256, "Practical Handbook of Additives for Plastics and Rubber". ” (Kagaku Kogyo Shinbunsha, published in 1970) No. 489
It is described in detail on pages 629 to 629. (C) Fibrous materials Furthermore, the natural fibrous materials and synthetic fibrous materials used in the present invention include inorganic fibers such as glass fibers, graphite fibers, and asbestos fibers;
It is broadly divided into synthetic organic fibers such as polyester fibers, polyamide (nylon) fibers, cellulose (rayon) fibers, vinylon fibers and Bemberg fibers, and natural fibers such as cotton, linen and wool. The length of these fibrous materials is usually 0.1-50mm
and particularly preferably 0.5 to 5 mm. Also, the diameter is generally 0.1 to 30 microns, especially 1
~20 microns is preferred. Furthermore, the granularity is 10
Preferably, it has a mesh size to 50 meshes. Among these fibrous materials, glass fibers, cellulose fibers and graphite fibers are preferred. In addition, these fibrous materials that have been previously treated with a coupling agent (for example, methoxylan-treated materials,
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 based on 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. It is. Typical examples of tackifiers include coumaron-indene resin, which is produced by polymerizing coumaron, indene, styrene, etc. contained in coal tar;
Examples include phenol/terpene resins, petroleum hydrocarbon 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, Rubber and Plastic Compounded Chemicals". Examples include ring agents and titanium coupling agents.A typical example of a silane coupling agent is represented by the general formula (), and a typical example of a titanium coupling agent is represented by the formula (). (RO) ₃ −Si−R′ () In formulas () and (), the RO group is a functional group such as an alkoxy group or acetoxy group having 1 to 5 carbon atoms that produces a silano group by hydrolysis, and R' is a functional group having 1 to 5 carbon atoms, such as an acetoxy group. ~20 first class,
R″ is a hydrocarbon group (which may have a substituent) having at most 40 carbon atoms,
A and B may be the same or different, −OCOR ¹ ,
−OSO ₂ R ² , −OPO(OH)OPO−(OR ³ ) ₂ or −
OR ⁴ (However, R ¹ , R ² , R ³ and R ⁴ may be the same or different, and are hydrocarbon groups having at most 40 carbon atoms), and m and n are integers from 0 to 3. However, l+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 vinyltrichlorosilane, γ-chloropropyltrimethoxysilane, γ-metachloropropyltrimethoxysilane, γ-aminopropyltriethoxysilane, isopropyl tristearoyl titanate, isopropyl tridecylbenzenesulfonyl titanate, Examples include isopropyl tris(dioctyl pyrophosphate titanate, bis(dioctyl pyrophosphate) oxyacetate titanate, etc.) (E) Dehydrochlorination inhibitor Further, the dehydrochlorination inhibitor used in the present invention is generally vinyl chloride. Polymers containing halogen atoms (mainly chlorine atoms) such as polymers are widely used to prevent dehydrochlorination caused by heat etc. The dehydrochlorination inhibitor is They are broadly classified into metal soaps, inorganic acid salt metal compounds, organic tin compounds, and pure organic compounds.Of these, typical examples of metal soaps include organic carboxylic acids with 1 to 10 carbon atoms (at most metal salts (optionally substituted with three chlorine atoms) include lithium, magnesium, calcium, strontium, barium, cadmium, aluminum and lead.Other metal soaps include: Also mentioned are lead salts of carboxylic acids such as tribasic maleic acid, dibasic phthalic acid and salicylic acid. Also included are inorganic acid salts such as alkylaryl cadmium phosphite, lead orthosilicate-silica gel coprecipitate, basic Examples include lead silicate, tribasic lead sulfate, basic lead sulfite, and dibasic lead phosphite.Among metal oxides, magnesium oxide is preferably used.Furthermore, as an organotin compound, Dibutyl tin dilaurate, octyl tin compounds, dimethyl tin compounds, dibutyl tin malate, sulfur-containing organotin compounds, stannane diol derivatives, and dibutyl-1-C-tin-β
- Examples include mercaptopropanoate. Examples of pure organic compounds include chelating agents [the general formula is shown in formula ()] and epoxy compounds. In formula (), R ⁵ , R ⁶ , and R ⁷ 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 listed on pages 266 to 266 of the above-mentioned "Handbook, Rubber/Plastic Compounded Chemicals".
It is described on page 319. Among these dehydrochlorination inhibitors, inorganic acid salts, metal oxides and organic tin compounds are preferred, and inorganic acid salts and metal oxides are particularly preferred. Particularly suitable are dibasic lead phthalate, dibasic lead stearate, tribasic lead sulfate, basic lead silicate, magnesium oxide and lead oxide. (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, particularly 140°C. ℃ or higher is preferable. Representative examples of suitable organic peroxides include ketone peroxides such as 1,1-bis-tertiary-butylperoxy-3,3,5-trimethylcyclohexane, 2,5-dimethylhexane-2,5 -hydroperoxides such as dihydroperoxide, peroxyesters such as 2,5-dimethyl-2,5-di-tertiary-butylperoxyhexane, diacyl peroxides such as benzoyl peroxide, and dicumyl peroxide. Dialkyl peroxides such as: 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 ratio The composition ratio of other compounding components to 100 parts by weight of chlorinated polyethylene (including other rubber-like substances and/or resin-like substances, if these are included) is as follows. The composition ratio of the inorganic filler is 5 to 70 parts by weight,
5 to 60 parts by weight is preferred, particularly 10 to 50 parts by weight. 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 more than 70 parts by weight is added, moldability will be poor,
It is difficult to obtain a uniform composition, and even if a molded product is obtained, it is not preferred because of poor flexibility. Furthermore, the composition ratio of the natural fibrous material and the synthetic fibrous material is 10 to 100 parts by weight in total, preferably 12 to 100 parts by weight, and especially 15 to 100 parts by weight.
80 parts by weight is preferred. If the total composition ratio of natural fibers and synthetic fibers 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, not only will the dispersibility of these fibrous materials be poor even with the aid of the above-mentioned tackifier or coupling agent, but it will also be difficult to obtain a uniform composition; Even if this is achieved, the flexibility is not good. In addition, the composition ratio of the tackifier and the coupling agent is 0.5 to 10.0 parts by weight in total, preferably 0.5 to 7.0 parts by weight, and especially 1.0 to 10.0 parts by weight.
7.0 parts by weight is preferred. If the composition ratio of the tackifier and coupling agent is less than 0.5 parts by weight in total based on 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 abrasion resistance. Furthermore, the blending ratio of dehydrochlorination inhibitor is 1.0~
The amount is 15.0 parts by weight, particularly preferably 5.0 to 10.0 parts by weight. Further, the blending ratio of the organic peroxide is 0.1 to 20.0 parts by weight, particularly preferably 1.0 to 10.0 parts by weight. Furthermore, if a crosslinking aid is used, the proportion used is at most 10.0 parts by weight. Furthermore, if the blending ratio of the organic peroxide is below 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. (H) 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 and resin industries may also be used. Additives such as agents, oxygen, ozone, heat and light (ultraviolet) stabilizers, 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 a treated product may be used, or the composition may be produced without this treatment. It may be added at the same time. When producing the composition of the present invention, the blending (mixing) method may be to use a mixer commonly used in the art, such as an open roll, dry blender, Banbury mixer, or kneader. Among these mixing methods, in order to obtain a more uniform composition, two or more of these mixing methods may be applied (for example, after mixing in advance with a dry blender, the mixture may be mixed using an open roll). how to). 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, a method of manufacturing a molded product while vulcanizing (crosslinking) it by adding chlorinated polyethylene or the above-mentioned composition and vulcanizing (crosslinking) it in the rubber technology field, that is, a method of simultaneously proceeding vulcanization and molding, 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 that is used for molding into a desired shape. In addition, a method of manufacturing a molded product while vulcanizing (crosslinking) it by adding chlorinated polyethylene or the above-mentioned composition and vulcanizing (crosslinking) it in the rubber technology field, that is, a method of simultaneously proceeding vulcanization and molding, is applied. It may be formed into a desired shape. [] Examples and Comparative Examples The present invention will be explained in more detail below using Examples. In addition, in the Examples and Comparative Examples, the heat aging test was conducted using a Schooper type tensile tester after leaving JIS No. 3 dumbbells for 3 days while the JIS gear was open at a temperature of 120°C. , tensile strength (hereinafter referred to as "T _B "), elongation rate (hereinafter referred to as "E _B "), and hardness (hereinafter referred to as " _HS "), and the change rate of T _B , E _B and H I asked for _S. In addition, the abrasion resistance test was performed using an Akron type abrasion tester and a taper type abrasion tester at a load of 3.
Wear amount was measured in cc under conditions of kg and 1000 rotations. Furthermore, the compression permanence test is JIS K-
According to 6301, the temperature was set to 120℃, respectively.
The strain value (%) after being left for 3 days was measured. Furthermore, in the grease resistance test, grease (manufactured by Fuji Kosan Co., Ltd., product name F-Mild EP-460) was placed in a JIS test tube tester set at a temperature of 120°C, and a JIS No. 3 dumbbell was placed inside the test tube. Samples for volume change rate measurement were immersed in the sample and left for 5 days, and then measured in the same manner as in the heat aging test using the same measuring device. Note that the volume change rate (hereinafter referred to as “△
(referred to as "V") was measured using the Archimedes method. Furthermore, the engine oil resistance test was conducted under the same conditions as the grease resistance test using Toyoda genuine engine oil (20W-40-Catusle Sparklin-SD). In addition, the chlorinated polyethylene, inorganic filler, natural fibrous material,
Types of synthetic fibrous materials, tackifiers, coupling agents, organic peroxidants and dehydrochlorination inhibitors,
The physical properties are shown below. [(A) Chlorinated polyethylene] As chlorinated polyethylene, the density is 0.941g/
chlorinated polyethylene [chlorine content 40.2% by weight, amorphous ^, hereinafter referred to as "CPE (A )”] and density is 0.936
g/ ^cm3 ethylene polymer (average molecular weight approximately 170,000)
Chlorinated polyethylene obtained by chlorinating it by an aqueous suspension method [chlorine content 30.2% by weight,
Crystalline material (hereinafter referred to as "CPE(B)") was used. [(B) Inorganic filler] As an inorganic filler, Furnace Black (manufactured by Showa Cabot Co., Ltd., trade name: SHOW BLACK N-) was used as an inorganic filler.
220, particle size 19-29 mm, specific surface area 111
~128m ² /g, hereinafter referred to as "CB") and dry method white carbon (manufactured by Nippon Aerosil Co., Ltd., trade name Aerosil 130, average particle size 16 millimicrons, average specific surface area 130m ² /g, hereinafter referred to as "WCB") [(C) Natural fibrous material and synthetic fibrous material] As the fibrous material, silane-treated glass fiber (average diameter 5 microns, average length 1 mm, hereinafter referred to as "GF"), carbon Fiber (average diameter 5 microns,
average length 1 mm, hereinafter referred to as "CF"), polyamide fiber (average diameter 3 microns, average length 2 mm, hereinafter referred to as "AF"), and titanium-treated glass fiber (average diameter 5 microns, average length 1 mm,
(hereinafter referred to as "GFT") was used. [(D) Tackifier and coupling agent] As a tackifier, coumaron-indene resin (softening point 100-130℃, hereinafter referred to as "TACK")
Also, as a coupling agent, γ-
Mercaptopropyltrimethoxysilane (hereinafter referred to as "compound (1)") and isopropyltridecylbenzenesulfonyl titanate (hereinafter referred to as "compound (2)") were used. [(E) Dehydrochlorination inhibitor] Tribasic lead sulfate (hereinafter referred to as "tribase") was used as a dehydrochlorination inhibitor. [(F) Organic peroxide] Dicumyl peroxide (hereinafter referred to as "DCP") was used as the organic peroxide. [(G) Crosslinking aid] Triallyl isocyanate (hereinafter referred to as "TAIC") was used as a crosslinking aid. 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 dehydrochlorination inhibitor) 5 parts by weight of DCP ( (as an organic peroxide) and 3 parts by weight of TAIC (as a crosslinking aid), as well as inorganic fillers, natural or synthetic fibers, 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.
A mixture obtained by sufficiently kneading CPU (B) using an open roll whose surface temperature was previously set to 130°C was used. Furthermore, in Comparative Examples 8 to 11, no tribase was added]. Each mixture thus obtained is heated to a temperature of 170
A sheet was prepared by hot pressing for 15 minutes at a temperature of 200 kg/cm ² at a pressure of 200 kg/cm 2 . 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 kneading was heat pressed for 30 minutes under the same conditions as above to produce samples for compression set test and abrasion resistance test,
Tests were conducted on each. 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, T _B and E _B are the rates of change (unit: %)
and H _S are shown as changes (units are points).

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[Table] 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 is
Not only does it have excellent heat aging resistance, grease resistance, engine oil resistance, and compression set resistance, but it also has particularly good abrasion resistance, making it suitable for sealing materials that require wear resistance and sealing materials for industrial products. It is clear that it has a promising future as a material for packing, capping, etc.

Claims (1)

[Scope of Claims] 1 (A) 100 parts by weight of chlorinated polyethylene, (B) 5 to 70 parts by weight of inorganic filler, (C) 10 to 100 parts by weight of natural and/or synthetic fibrous material
Parts by weight, (D) Tackifier and/or coupling agent
0.5 to 10.0 parts by weight, (E) Dehydrochlorination inhibitor for vinyl chloride polymers
A chlorinated polyethylene composition comprising 0.5 to 15.0 parts by weight and (F) 0.1 to 20.0 parts by weight of an organic peroxide.