JPS5925832A - Automobile tensioner damper - Google Patents

Abstract

PURPOSE:To provide titlted tensioner damper of low cost, giving high heat deterioration resistance, etc., comprising a chlorinated polyethylene, carbon black, both phenol and thiopropionate-based antioxidants, hydrogen chloride- removale-proof agent, and organic peroxide. CONSTITUTION:The objective tensioner damper comprising (A) 100 parts by wt. of a chlorinated polyethylene (pref. of noncrystalline type with a chlorine content of 25-45wt%), (B) 10-100 parts by wt. of carbon black, (C) 0.1-10 parts by wt. of a phenol antioxidant, (D) 0.1-10 parts by wt. of a thiopropionate-based antioxidant, (E) 0.5-15 parts by wt. of a hydrogen chloride-removale-proof agent (e.g. an inorganic acid salt, metallic oxide; pref. lead oxide), and (F) 0.1-20 parts by wt. of an organic peroxide. It is preferable that the component (B) has a specific area of 600-1,200m<2>/g determined by the BET-procedure, etc.

Description

[Detailed Description of the Invention] Mark Object of the Invention The present invention consists of chlorinated polyethylene, zero carbon black,
Ω phenolic antioxidant, D thiopropionate antioxidant, ■ vinyl chloride polymer dehydrochlorination inhibitor, and [F] Automotive tensioner/damper obtained from organic peroxide. The purpose of this invention is to provide a tensioner/damper with excellent heat resistance.

ff1l Background of the Invention Since before, thermoplastic elastomers have been used with lubricants, fillers, anti-aging agents, plasticizers, vulcanizing agents, vulcanization accelerators, vulcanization accelerating aids,
Rubber elastic compositions, i.e. rubber products, obtained by adding additives such as crosslinking agents and crosslinking aids and vulcanizing or crosslinking them by heat treatment are used in many safety and security heavy parts of automobiles and other parts. , structural improvements to automobiles are being made to maintain and improve automobile performance, and to comply with exhaust gas regulations. As a result, regarding automobile parts,
There is a demand for products with even higher performance (higher properties) in the most important properties (heat resistance, % weather resistance, oil resistance, etc.). Thermoplastic elastomers with high performance in these properties [e.g., silicon-containing rubber materials (silicon rubber),
[Epichlorohydrin-based rubbery materials, fluorine-containing rubbery materials] have 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, 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.

Moreover, if the product is used for a long time, it has disadvantages such as a decrease in rubber elasticity due to deterioration of the elastomer. 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 agent, antioxidant, etc., which have good ozone resistance, ozone resistance, and heat aging resistance are added, the long-term retention is poor. Also,
Ethylene-propylene-diene ternary copolymer rubber (EPD
Regarding M), it has excellent cold resistance, flexibility resistance, ozone resistance, and heat aging resistance. However, it does not have excellent oil resistance, which is the most important physical property for flexible automotive boots. Furthermore, chloroprene rubber (C
Regarding R), C. It exhibits excellent oil resistance, cold resistance, and bending resistance.

However, due to the presence of double bonds like 5Brl and NBR, short-term weather resistance and ozone resistance can be improved by adding relatively large amounts of anti-aging agent. However, due to long-term use, these properties result in poor heat aging resistance. Furthermore, chlorosulfonated polyethylene has oil resistance, cold resistance,
It has excellent properties of bending resistance, ozone resistance and weather resistance.

In addition, it has excellent heat aging resistance under temperature conditions of up to 120°C. However, when exposed to severe conditions of 120° C. or higher, the heat aging resistance decreases.

Structure of the Invention Based on the above, the present inventors have developed a rubber that is relatively low-priced, improves the drawbacks of these commonly used thermoplastic nidistomers, and is suitable for tensioners and dampers for automobiles. As a result of various searches for obtaining an elastic composition, we found that: 100 parts by weight of chlorinated polyethylene, 10 to 100 parts by weight of carbon black, Ω
Phenolic antioxidant 0.1-10.0 parts by weight, 0 Thiopropionate antioxidant 0.1-10.
0 parts by weight, ■ Dehydrochlorination inhibitor for vinyl chloride polymers 0.5 to 1
Automotive tensioners and dampers obtained from 5.0 parts by weight and [F] 01 to 20.0 parts by weight of organic peroxide are not only relatively inexpensive, but also have the same heat resistance as those commonly used. It was discovered that the drawbacks of plastic elastomers are greatly improved, and the present invention was achieved.

Effects of the Invention The automotive tensioner/damper of the present invention uses a phenolic antioxidant, a thiopropionate antioxidant, and a dehydrochlorination inhibitor in combination to reduce the release of organic peroxides caused by decomposition. The consumption of radicals is extremely low, so even if a relatively large amount of the above-mentioned antioxidant and dehydrochlorination inhibitor are blended, there is little effect on the degree of crosslinking, and the tensioner/damper for automobiles has excellent heat resistance.

The automobile tensioner/damper obtained by the present invention exhibits the following characteristics (effects).

(1) Good heat resistance.

(2) Excellent weather resistance.

(3) Good bending resistance and abrasion resistance.

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

(5) Good dimensional accuracy.

(6) Not only is molding processability good, but the shrinkage rate during molding is small.

(Power) The most distinctive effect is that it has excellent heat aging resistance even under severe conditions of 140°C or higher, and the decline in heat aging resistance is relatively small even after long-term use.

M Detailed Description of the Invention (5) 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, 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 parts by weight of α-olefin (generally having at most 12 carbon atoms). Its density is generally 0.910~
It is 0.970.9/Cc.

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

Although p1 chlorinated polyethylene alone may be used in preparing the compositions of the present invention, other types of polymeric substances that are miscible with chlorinated polyethylene may also be blended. Examples of the polymeric substances include ethylene-propylene-diene ternary copolymer comb (EPDM), natural rubber, chloroprene rubber, chlorosulfonated polyethylene rubber, styrene-butadiene copolymer rubber (SBR), and acrylonitrile. T-butadiene copolymer rubbers (NBR) and butadiene homopolymer rubbers [generally,
The Mooney viscosity (M L ++4) is 10 to 150]. In addition, other polymeric substances include the above-mentioned polyethylene, vinyl chloride resin whose main component is vinyl chloride (
(degree of polymerization, 400 to 1,800), resinous materials such as methyl methacrylate resins containing methyl methacrylate as a main component and acrylonitrile-styrene copolymer resins. Regarding these rubber-like materials and resin-like materials, there are "N Synthetic Rubber Products" edited by Kambara et al. (Asakura Shoten, published in 1962), "A Plastic Products" edited by Murahashi et al. (Asakura Shoten, published in 1962), etc. It is well known by.

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

■ Carbon black Also, the specific surface area of the carbon black used in the present invention is generally determined by low-temperature nitrogen adsorption method and B
The pore volume is 15 to 40 Cf-, /9 as measured by mercury porosimetry in the range of pore radius 30 to 7500, and the pore volume is 15 to 40 Cf-, /9 as measured by E'I'' method. Those having a surface area of 600 to 1200771"/.9 are effective.

Examples of the carbon black include channel black, acetylene black, thermal black, and carbon black produced by a furnace black method. Regarding these carbon blacks, see the Carbon Black Handbook compiled by the Carbon Black Association (Tosho Publishing, published in 1972), Rubber Digest Shasen N Handbook, and Rubber/Plastic Compound Chemicals (Rubber Digest, published in 1978). Their manufacturing methods and physical properties are well known, such as in the above-mentioned Six Synthetic Rubber Handbooks. Among these carbon blacks, conductive carbon black and acetylene black obtained by the acetylene method (generally, specific surface area is 600 to 1.200, ?/&) are suitable because they have high conductivity and high modulus. Not. In addition, channel black obtained by the channel method (generally,
Is the specific surface area 50-1200tr? /,! Although carbon black 9) is used for special purposes, it has an acidic pH and is therefore not suitable as carbon black for use in the present invention. On the other hand, thermal black and furnace black obtained by thermal method and furnace method are
Reinforcement, flexibility, side abrasion resistance, side heat resistance, oil resistance and alkalinity against chlorinated polyethylene (as pi-1)
It is suitable because it can provide high properties with a relatively small amount of compounding.

0 Phenolic antioxidant Furthermore, the phenolic antioxidant used in the present invention is generally used as an antioxidant for organic substances such as synthetic resins. The general formulas of typical phenolic antioxidants are represented by the following formulas [(■) formula to ω formula].

H 3 a) [Hereinafter referred to as “phenolic compound (1)”] [hereinafter referred to as “
TD [hereinafter referred to as "phenol compound (3)"] and Rg Ra ■ [hereinafter referred to as "phenol compound (4)"] However,
R1, R2 and R8 may be the same or different, and are an alkyl group having 1 to 20 carbon atoms across hydrogen atoms.

Ncroalkyl group having 4 to 20 carbon atoms, 1 to 20 carbon atoms
1-alkyl group having 20 alkyl groups; 1-alkyl group having 20 alkyl groups and 1 having an alkyl group having 1 to 20 carbon atoms;
- A hydrocarbon group selected from the group consisting of alkylbenzyl groups, at least two of R1, R2 and R3 are hydrocarbon groups, and R1 is an alkyl group having 1 to 6 carbon atoms. R3 and R11 may be the same or different, and may be a hydrogen atom, the above hydrocarbon group, or a carbon number of 7
~20 aralkyl groups or alkoxy groups having 1 to 20 carbon atoms, at least one of R6 and R6 is the hydrocarbon group or the above aralkyl group,
R7 and R8 may be the same or different, and may be a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, or a hydrogen atom or an alkyl group having 4 to 1 carbon atoms.
a 1-alkylcycloalkyl group or a 1-alkylbenzyl group having two cycloalkyl groups, an aryl group having 6 to 12 carbon atoms, or an alkyl group having 1 to 12 carbon atoms, and Ro is It is an alkylidene group or alkylene group having 1 to 12 carbon atoms, and X is 1 to 6
is an integer, and y is 1.2 or 3] a) Among the phenolic compounds (1) represented by the formula, σ)
In the formula, R, R2 and R3 each preferably have at most 12 carbon atoms. Representative examples of preferred ones include 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-methylphenol, and 2,4-dimethyl-6-ethylphenol. α,α′,γ,γ′-tetramethylYthyl)phenol, 2.6-sibenzyl-4-methylphenol, 2.
Mention may be made of 6-di-tertiary-amyl-4-methylphenol and 2-tertiary-butyl-4-ethyl-6-tertiary octylphenol. Other representative examples of the phenolic compounds are JP-A-50-138050 and JP-A-50-138050, JP-A No. 5]-6
It is described in each specification of No. 4563 and No. 51-112867.

Furthermore, among the phenolic compounds (2) represented by (11), compounds in which R1 has 3 to 6 carbon atoms in the (ID formula) are desirable. Representative examples of desirable compounds include tetra[methylene-3-(3, 5-di-tert-butyl-4-
hydroxyphenyl)propionate]methane, tetra[methylene-4-(3-tertiary-phthyl-5-n-hequinyl-4-hydroxyphenyl]butyrate]methane and tetra[methylene-4-(3,5-di-phthyl)] Tertiary-butyl-4-hydroxyphenyl)butyrate comethane is mentioned.

Other representative examples of the phenolic compounds include JP-A-51-
No. 6251, No. 51-64563 and No. 51-11
It is described in each specification of No. 2867. Furthermore, G.I.D.
Among the phenolic compounds represented by R5 and R,
It is preferable that the number of 3 carbons is at most 18, especially 4
or more is preferred.

Representative examples of suitable phenolic compounds include 2.2.
'-Thiobis-(4-octylphenol), 4,eachiobis[4-methyl-6-(1-methylchlorohexyl]phenol], 4.4''-thiobis(3,6-distyrylphenol) and 2,2- Dithiobis-(4-
n-propoxy-6-tertiary-butylphenol). Other typical examples of the phenolic compounds are JP-A-51-56860, JP-A-51-64563, and JP-A-51-51. -112687. It is described in each specification.

In addition, a phenolic compound (4
), in the above formula (IV), R7 and R8
The number of carbon atoms is preferably 18 at most, and particularly preferably 4 or less. Further, it is preferable that R9 has at most 12 carbon atoms, and particularly preferably 8 or less carbon atoms. Representative examples of the phenolic compounds include 2,2-methylenebis(4,6-dimethylphenol), 2.2''-methylenebis-(4-methyl-6
-tertiary-butylphenol), 4,4'-methylenebis-(6-tertiary-butylphenol), 2,2'-isopropylidenebis-(4,6-di-n-octylphenol) and 4,4'-deca Methylenebis-(3-methylphenol), 2.2″-trithiobis-(4-methoxy-6-tert-butylphenol) and 4.4′
-1 lithiobis-C2,6-di-tert-butylphenol).

No. 57756, No. 51-64563 and No. 51-1
．． No. 12867.

0 Thiopropionate-based antioxidant Also, the thiopropionate-based antioxidant used in the present invention is used as an antioxidant for organic substances such as synthetic resins, similar to the above-mentioned phenolic antioxidant. It is often used in combination with the phenolic antioxidant. The general formula of a typical thiopropionate antioxidant is shown as a T formula [M to W scale].

O 111 R, o-0-C-CnH,, n -8-CnH2n -
C-0-R,, 1 C2(-CH2-0-C-CnH,, n -8-R,2
)4 (However, R+o%IRI+ and RI2 may be the same or different, and are hydrocarbon groups selected from the group consisting of alkyl groups having 1 to 20 carbon atoms, aryl groups, and aralkyl groups. , n is an integer from 1 to 20) Among the thiopropione-1 type antioxidants used in the present invention, representative examples include dibutylthiodiglopionenit, cyamylthiodipropionate, and dioctylthiodipropionate. nate, diheptylthiodipropionate, dioctylthiodipropionate, dioctylthiodipropionate, dilaurylthiodipropionate,
Dimyristylthiodipropionate-1, lauryl stearylthiodipropionate, distearylthiodipropionate and pentaerythritol tetrakis (β
-Laurylthiopropinate).

Representative examples of other thiopropionate-based antioxidants are found in JP-A-51-64563, Rubber Digest Co., Ltd. Sixth Handbook, Rubber and Plastic Compounded Chemicals (Rubber Digest Co., Ltd., published in 1972), No. 105. It is described in detail on pages 111 to 111 and pages 111 to 130 of 11 Plastic Compounds (Basics and Applications) edited by Yamada et al. (Taiseisha, published in 1962). Among the thiopropionate antioxidants, in the above M formula and formula (2), R10% R11 and R12 each preferably have at most 20 carbon atoms, preferably 9 parts or more, and 12 or more carbon atoms. It is. Representative examples of suitable thiopropionate antioxidants include dilaurylthiopropinate dimyristylthiodiprobionate, lauryl stearylthiodipropionate, distearylthiodipropionate, and pentaerythritol tetrakis (β).
- lauryl thioglopine).

■ 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 etc. It is widely used to prevent 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, tribasic 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 dibutyl tin dilaurate, octyl tin compounds, dimethyl tin compounds, dibutyl tin malate, sulfur-containing organic tin compounds, stannane diol derivatives, and dibutyl-1-
C-tin-β-mercaptopropanoate is mentioned.

In addition, as a pure organic compound, a chelating agent [the general formula is
] and epoxy compounds.

In the NQ formula (2), R, 3, R, 4 and RI5 may be the same or different, and are hydrocarbon groups having at most 20 carbon atoms.

Furthermore, other dehydrochlorination inhibitors include stearoylbenzoylmethane and panoylbenzoylmethane.

These dehydrochlorination inhibitors are listed in Rubber Digest's Air Handbook, Rubber/Plastic Compounded Chemicals (published by Rubber Digest in 1972), pages 266 to 319.
It is written on the page. 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. ℃
The above are preferred.

Representative examples of suitable organic peroxides include 1,1-bis-
Ketone peroxides such as tertiary-butylperoxy-3,3,5-)limethylcyclohexane.

2,5-Dimethylhexane-2; Hydroperoquinde such as 5-dihydroboroquinde, peroxy ester such as 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, benzoyl peroxyhexane. Mention may be made of diacyl peroxides such as oxides 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.

0 Blending ratio The blending ratio of other blending 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 blending ratio of carbon black is 10 to 100 parts by weight, preferably 20 to 100 parts by weight, and the proportion is 30 to 100 parts by weight.
00 heavy view part is suitable. If the blending ratio of carbon black to 100 parts by weight of chlorinated polyethylene is less than 10 parts by weight, a tensioner/damper with excellent wear resistance and engine oil resistance cannot be obtained. On the other hand, 10
If it exceeds 0 parts by weight, moldability will be poor and a good product will not be obtained.

The blending ratio of the phenolic antioxidant is preferably 01 to 100 parts by weight, particularly preferably 01 to 50 parts by weight.

In addition, the blending ratio of thiopropionate antioxidant is 0.
．． The amount is 1 to 100 parts by weight, preferably 0.1 to 5.0 parts by weight.

Furthermore, the blending ratio of the dehydrochlorination inhibitor is 1.0 to 15.
0 parts by weight, particularly preferably 5.0 to 100 parts by weight.

The blending ratio of the organic peroxide is 0.1 to 20.0 parts by weight, preferably 1.0 to 10.0 parts by weight.

Furthermore, when a crosslinking aid is used, the proportion used is at most 10.0 parts by weight.

Phenolic antioxidant for chlorinated polyethylene,
If the blending ratio of the thiopropionate antioxidant and the dehydrochlorination inhibitor is less than the lower limit, a tensioner/damper with good stability cannot be obtained. On the other hand, even if the amount exceeds the upper limit, it is still undesirable. Furthermore, if the blending ratio of the organic peroxide is below the lower limit, crosslinking will not proceed completely, making it impossible to obtain a good tensioner/damper.

On the other hand, if the upper limit is exceeded, crosslinking will progress rapidly, making it difficult to obtain a tensioner/damper with a good shape, or it may become difficult to control crosslinking. .

■ Mixing method, molding method, etc. Fillers, plasticizers, oxygen, ozone, heat, etc. When producing the original invention ♂Km, the blending (mixing) method is the open roll, Two or more types of mixing methods may be applied using mixers such as a dry blender, a Banbury mixer, and a kneader.

(For example, a method in which the mixture is mixed in advance with a dry blender and then mixed using an open roll)
.

You may let them.

EXAMPLES 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, the heat aging test was
After leaving all the JISN No. 3 dumbbells for 10 days while the JIS gear was open at a temperature of 15'O ℃, using a Shoba type tensile tester, the tensile strength (hereinafter referred to as "TB") and elongation were measured. (hereinafter referred to as "EB") and hardness C (hereinafter referred to as "H8"), and TB
The rate of change in EB and the change in Hs were determined. In addition, the oil resistance test was conducted during the JIS test tube test where the temperature was set at 150°C.
A JIS Na No. 3 dumbbell and a sample for measuring the rate of volume change were immersed in each of the three oils, left for 10 days, and then measured in the same manner as in the heat aging test using the same measuring device. In addition, the volume change rate (hereinafter referred to as “△■
) was measured using the Archimedes method. Furthermore, the water resistance test was conducted by placing water in a JIS tube tester set at a temperature of 100°C and leaving it there for 30 days.
It was measured using the same method as the oil resistance test. The weather resistance test was carried out using a Sunshine Weather Meter manufactured by Toyo Seiki Co., Ltd., after being left at a temperature of 40° C. for 30 days, and then measured in the same manner as the heat aging resistance test. Furthermore, the wear resistance test was conducted using the Akron type abrasion test method at a load of 3 kg and a rotation speed of 30.
The wear amount was measured in parts at 00 revolutions/min. In addition, the compression set test was conducted by setting the temperature to 120°C and 150°C, and measuring the strain value (correspondence) after standing for 3 days. Furthermore, for the bending resistance test, repeated fatigue was performed by 500,000 cycles using a demature tester, and the presence or absence of cracks was measured.

In addition, each mixed component used in Examples and Comparative Examples was manufactured by the following shapes, physical properties, and manufacturing methods.

[(5) Chlorinated polyethylene] As chlorinated polyethylene, the density is 0.941 g/a
Chlorinated polyethylene (chlorine content 41.2% by weight, non-quality, hereinafter referred to as "CPE") obtained by chlorinating the ethylene polymer (average molecular weight approximately 200,000) of d by an aqueous suspension method. ) was used.

[■ Carbon black]

As carbon black, furnace black (manufactured by Asahi Carbon Co., Ltd., trade name PEF Asahi 60, average particle size 5
1 millimicron, specific surface area 58n? /g, hereinafter [cB
-IJ) and Thermal Black (manufactured by Asahi Carbon Co., Ltd., trade name Asahi Thermal, Flat [Ω Phenolic Antioxidant]) As a phenolic antioxidant, 2.2''-thiodi-
Ethyl-bis[3-(3,5-di-tert-butyl-4)
-hydroxyphenyl)prozeonate] [hereinafter referred to as "antioxidant (1)"].

[0 thiopropione, 1 photo-oxidant Cothiopropione-1 As an antioxidant, pentaerythritol tetro(lauryl-thiopropionate) [hereinafter referred to as "antioxidant (2)"] O 1: and dilaurylthiopropione-1 (hereinafter referred to as 1'-DLTDP J).

[■ Dehydrochlorination inhibitor]

As a dehydrochlorination inhibitor, tribasic lead sulfate (hereinafter referred to as "tribase") and magnesium oxide (manufactured by Kyowa Chemical Industry Co., Ltd., trade name Kiyowa Mag + 150,100 mesh pass, specific surface area 150tt? / 9, hereinafter rM)
gOJ) was used.

[[F] Organic peroxide]

As the organic peroxide, 1,1-bis-tertiary-butylperoquine-3,3,5-)limethylcyclohexane C (hereinafter referred to as "peroxide") was used.

C (G crosslinking aid) As a crosslinking aid, triaryl inanate C below "
TAIC) was used.

[σ] Plasticizer

As a plasticizer, trioctyl trimellitate (hereinafter “
TOTMJ) was used.

[σ] Other additives] Wax (manufactured by Inuyama Shinko Co., Ltd., trade name: Sannotsu, average molecular weight: about 700) was used as another additive.

Examples 1 to 5, Comparative Examples 1 to 7 100 parts by weight of CPE (as chlorinated polyethylene),
4 parts by weight of peroxide (as organic peroxide), 20
TOT'M (as plasticizer) in parts by weight, TA in 3 parts
IC (as crosslinking coagent) and 2 parts by weight of Suntite S
(as other additives) and CB-1 and CB-2 as carbon black, antioxidant (1) as phenolic antioxidant, antioxidant (2) or DT as thiopropionate antioxidant , T.D.
P and tribase or Mg0(
The respective blending amounts are shown in Table 1) using an open roll whose surface temperature was preset at 50°C.
'? A sheet having a thickness of α was formed while thoroughly kneading the mixture for a period of time.

Each sheet formed in this way is 3 cm x 3
It was cut into square pieces of cm. The obtained square sheet was heated using a heat press machine (manufactured by Daikai Tekko Co., Ltd., 50 ton press, heat press temperature: 17
Using a mold for a tensioner/damper (5°C, press time 15 minutes), vulcanization bonding was performed with iron with a thickness of 14 mm, width of 28 mm, length of 3 cm, and product weight of 25 g.
Created tensioner and damper products. Side heat aging test 1-1 for these tensioner/damper products.
(s change, water resistance test and oil resistance test volume change rate and 1 (s change and engine oil volume change rate and I-T s change rate were measured. Also, heat aging resistance test, oil resistance test and The rate of change in Tn and EB of cutting engine oil is 200Kg/at a temperature of 175℃.
A sheet was prepared by hot pressing at a pressure of ca for 15 minutes, and the sheet was measured. Furthermore, for the abrasion resistance test, side bending test, and compression set test, crosslinking was performed by hot pressing at a temperature of 175°C for 30 minutes under a pressure of 9/al to 200, and measurements were performed on the obtained samples. I did it. Table 2 shows the results of the heat aging test, water resistance test and weather resistance test. Furthermore, the results of the oil resistance test, compression set test, bending resistance test, and abrasion resistance test are shown in Table 3. In addition, in these tables, TB and EB indicate the rate of change (in units) and l-18 indicates change (in points).

From the results of the above Examples and Comparative Examples, the automotive tensioner/damper obtained by the present invention has excellent oil resistance and heat aging resistance at high temperatures (150°C) in TB (tensile strength) and En (elongation rate). It is clear that not only is it good, but also the compression set resistance at high temperature (150° C.) is good.

Patent applicant: Showa Denko Co., Ltd. Agent: Patent attorney Sei Kikuchi 239-

Claims (1)

[Claims] 8. Chlorinated polyethylene 100 parts by weight0 Carbon black 10-100 parts by weight, 0 Phenolic antioxidant 01-10.0 parts by weight0 Thiopropionate antioxidant 01-00, O D Dehydrochlorination inhibitor for vinyl chloride polymers 05-15
An automobile tensioner/damper obtained from 0 parts by weight and 01 to 20.0 parts by weight of D organic peroxide.