JPH021851B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a chlorinated polyethylene composition having good heat resistance. More specifically, it relates to a chlorinated polyethylene composition consisting of (A) chlorinated polyethylene, (B) metal oxide and hydrotalcite group, (C) organic peroxide, and (D) quinoline compound, and is heat resistant. The object of the present invention is to provide a chlorinated polyethylene composition with excellent properties. BACKGROUND ART Conventionally, there has been a demand for heat-resistant rubber-like materials in the fields of automobile parts, home appliance parts, and the like. As this rubbery material, heat-resistant rubbers mainly composed of silicon-containing rubbery material (silicon rubber), epichlorohydrin-based rubbery material, fluorine-containing rubber, etc. are generally used. However, these rubber-like materials have problems in terms of processability and cost. On the other hand, since chlorinated polyethylene has less satisfactory heat resistance than these heat-resistant rubbers, it has not been used in such fields where heat resistance is required. In order to improve the heat aging resistance of chlorinated polyethylene, it is possible to add a relatively large amount of anti-aging agent, but anti-aging agents are generally produced by the decomposition of organic peroxides used as cross-linking agents. There was a problem that only a small amount could be added because the active radicals consumed were consumed. Problems to be Solved by the Invention In view of the abnormality, the object of the present invention is to obtain a chlorinated polyethylene composition which does not have these drawbacks (problems) and has excellent heat resistance. Means and Effects for Solving the Problems According to the invention, these problems are solved by: (A) 100 parts by weight of chlorinated polyethylene; (B) 1.0 parts by weight of metal oxides and hydrotalcites;
~15.0 parts by weight, (C) 0.1 to 20.0 parts by weight of an organic peroxide, and (D) 0.05 to 5.0 parts by weight of a quinoline compound, and the total amount of the metal oxide and hydrotalcite group The proportion of hydrotalcite group in the composition can be solved by a chlorinated polyethylene composition in which the proportion is 1.0 to 80% by weight. The present invention will be explained in detail below. (A) Chlorinated polyethylene The chlorinated polyethylene used in the present invention can be obtained by chlorinating polyethylene powder or particles in an aqueous suspension or by chlorinating polyethylene dissolved in an organic solvent. (preferably those obtained by chlorination in aqueous suspension). Generally, it is amorphous or crystalline chlorinated polyethylene whose chlorine content is 20 to 50% by weight, especially
25-45% by weight of 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/cm ³ . 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. As the polymer substance, ethylene-
Propylene-diene ternary copolymer rubber (EPDM), natural rubber, chloroprene rubber, chlorosulfonate polyethylene rubber, styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer rubber ( NBR), urethane-based rubbers, and butadiene homopolymer rubbers [generally,
Mooney viscosity (ML ₁₊₄ ) is 10 to 150]. In addition, other polymeric substances include the above-mentioned polyethylene, vinyl chloride resin containing vinyl chloride as the main component (degree of polymerization, 400-1800), methyl methacrylate resin containing methyl methacrylate as the main component, and acrylonitrile-styrene copolymer resin. Examples include resin-like substances such as. Regarding these rubber-like and resin-like materials, please refer to "Synthetic Rubber Handbook" edited by Kambara et al. (Asakura Shoten, published in 1962) and "Plastic Handbook" edited by Murahashi et al.
(published in 1964), etc., is well known. When blending these polymeric substances, the blending ratio is at most 50 parts by weight per 100 parts by weight of chlorinated polyethylene. (B) Metal oxide The average particle size of the metal oxide used in the present invention is usually 0.1 to 150 microns, with 1.0 to 120 microns being particularly preferred. Also,
Typical examples include oxides of lead, aluminum, magnesium, titanium, zinc, nickel, manganese and tin, especially oxides of lead, magnesium, aluminum and titanium. (C) Hydrotalcite group Furthermore, the hydrotalcite group used in the present invention has a general formula of MgaMeb(OH)cCO ₃ .
MH ₂ O (where Me is Al, Cr or Fe,
a is from 1 to 10, b is from 1 to 5, and c is from 10 to
20 and M is 1 to 8). The average grain size of this hydrotalcite group is generally 0.1~
150 microns, particularly preferably from 0.5 to 100 microns;
Preferably, it is Al. (D) 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; - 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. (E) Quinoline compound Furthermore, the quinoline compound used in the present invention is generally used as an anti-aging agent and an antioxidant in the rubber industry and the resin industry. The quinoline compound improves heat resistance in the reaction with the chlorinated polyethylene. A typical example of the quinoline compound used in the present invention is 2,2,4-trimethyl-1,2
-dihydroquinoline polymer, 6-ethoxy-2,
2,4-trimethyl-1,2-dihydroquinoline, 6-dodecyl-2,2,4-trimethyl-
Examples include 1,2-dihydroquinoline and trimethyl-dihydroquinoline derivatives. These quinoline compounds are described on pages 89 to 90 of the above-mentioned "Handbook of Rubber and Plastic Compounded Chemicals". (F) Composition ratio The composition ratio (blending ratio) of other composition components to 100 parts by weight of chlorinated polyethylene is as follows. The blending ratio of metal oxide and hydrotalcite group is 1.0 to 15.0 parts by weight as a total amount, and 2.0 to 15.0 parts by weight.
12.0 parts by weight is preferred, particularly 3.0 to 12.0 parts by weight. The blending ratio of the organic peroxide is 0.1 to 20.0 parts by weight, preferably 0.5 to 15.0 parts by weight, and particularly preferably 1.0 to 10.0 parts by weight. Furthermore, the blending ratio of quinoline compounds is 0.05~
5.0 parts by weight, preferably 0.05 to 4.0 parts by weight,
Particularly suitable is 0.05 to 3.0 parts by weight. Furthermore, when a crosslinking aid is used, the proportion used is at most 10.0 parts by weight. If the mixing ratio of the metal oxide and the hydrotalcite group to the chlorinated polyethylene is less than the lower limit, a molded product (such as a sheet) with good stability cannot be obtained.
On the other hand, even if the upper limit is exceeded, the stability will not be further improved, and in fact, they may bleed onto the surface of the molded product, which is not preferable. Furthermore, if the blending ratio of the organic peroxide is less than the lower limit, crosslinking will not proceed completely, making it impossible to obtain a good molded product. On the other hand, if the upper limit is exceeded, crosslinking will proceed rapidly, making it difficult to obtain a product with a good shape.
Crosslinking can also be difficult to control. Furthermore, if the blending ratio of the quinoline compound is less than the lower limit, a composition with good heat resistance cannot be obtained. on the other hand,
Even if the amount exceeds the upper limit, it is not expected to further improve heat resistance. In addition, the proportion of hydrotalcite group in the total amount of metal oxides and hydrotalcite group is
1.0 to 80% by weight, preferably 2 to 75% by weight,
Particularly suitable is 5 to 70% by weight. (G) 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 are also added. Additives such as oxygen, ozone, heat and light (ultraviolet) stabilizers, lubricants and colorants may be added depending on the intended use of the composition. When producing the composition of the present invention, the compounding (mixing) method may be to use mixers such as open rolls, dry blenders, Banbury mixers, and kneaders commonly used in the art. The composition of the present invention may be molded into a desired shape using molding machines commonly used in the rubber industry, such as extrusion molding machines, injection molding machines, compression molding machines, and calender molding machines. 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 now be described in more detail with reference to Examples. In the Examples and Comparative Examples, the tensile test was conducted in accordance with JIS K-6301 using a chopper type tester using JIS No. 3 dumbbells to determine the tensile strength (hereinafter referred to as "T _B ") and elongation rate. (hereinafter referred to as " _EB ") and hardness (hereinafter referred to as " _HS ") were measured. In addition, the heat aging test was conducted by leaving the JIS No. 3 dumbbell in a JIS gear oven set at a temperature of 150°C for 3 days, and using a Schottsper type tensile tester to determine the tensile strength (hereinafter referred to as "T _B "). ), elongation rate (hereinafter referred to as " _EB "), and hardness (hereinafter referred to as " _HS ") were measured, and the rate of change in T _B and _EB and the change in H _S were determined. Further, the cold resistance test was conducted by measuring the embrittlement point using an impact resistance tester in accordance with JIS K-6301. Furthermore, the compression set test was performed by compressing 25% in accordance with JIS K-6301, and
The test was carried out by measuring the thickness of the sample after leaving it for 3 days using a gear open tester set at a temperature of .degree. C., and measuring the strain rate (%) of the sample. Examples 1 to 7, Comparative Examples 1 to 5 Chlorinated polyethylene obtained by chlorinating an ethylene polymer (average molecular weight approximately 200,000) with a density of 0.935 g/cc by an aqueous suspension method (chlorine content 36.1 weight) %, amorphous, hereinafter referred to as "CPE") and Mg _4.5 Al ₂ (OH) ₁₃・ CO ₃・ 3.5 H ₂ O (average grain 80 microns in diameter (hereinafter referred to as “DHT”), magnesium oxide (average particle size) as a metal oxide
45 microns, hereinafter referred to as "MgO"] or lead oxide [average particle size 30 microns, hereinafter referred to as "PbO"] and 2,2,4-trimethyl-1,1,2
- dihydroquinoline polymer (as a quinoline compound, hereinafter referred to as "antioxidant"), 4 parts by weight of 1,1-bis-tertiary-butylperoxy-3,
3,5-trimethylcyclohexane (as an organic peroxide), 3 parts by weight of triallylisocyanurate (as a crosslinking aid), trioctyl trimellitate (hereinafter referred to as "TOTM") as a plasticizer.
and dioctyl sebacate (hereinafter referred to as "DOS") and carbon black manufactured by the furnace method as a filler (manufactured by Showa Cabot Co., Ltd.,
Product name: Asahi Black FEF, average particle size: 51 millimicrons, specific surface area, 41 m ² /g, FEF (hereinafter referred to as "CB-1") and carbon black manufactured by the same method (manufactured by Asahi Carbon Co., Ltd., product name: Asahi Thermal, average particle size 118 mm, specific surface area
19 m ² /g, SRF (hereinafter referred to as "CB-2") were thoroughly kneaded for 20 minutes using an open roll at room temperature (approximately 20°C) at the mixing ratios (parts by weight) shown in Table 1. The sheet was formed while Each sheet obtained in this way is heated to
A crosslinked sheet was prepared by hot pressing at 150° C. and a pressure of 200 kg/cm ² for 20 minutes. Tensile test of each sheet obtained in this way,
A heat aging test and a cold resistance test were conducted. In addition, for the compression set test, each sheet obtained with a roll was rolled in the M direction, and a sample was prepared under the same crosslinking conditions as above, and the test was conducted in the same manner as the heat resistance test. The results are shown in Table 2. In addition, the second
In the table, T _B and E _B are percentage changes (unit: %)
and H _S indicates change (unit point).

【table】

[Table] Note that dehydrochlorination occurred during crosslinking of the composition (sheet) obtained in Comparative Example 2. From the above Examples and Comparative Examples, the composition obtained by the present invention has excellent heat aging resistance compared to a composition that does not contain at least one of the quinoline compound, metal oxide, and hydrotalcite group. In addition, it is clear that no cracks occur in the compression set test (that is, the flexibility is good), and the low temperature resistance is also good. It is also clear that it is promising as a material for automobile parts and home appliance parts. Effects of the Invention By using the quinoline compound used in the present invention together with the metal oxide and the hydrotalcite group, the consumption of free radicals generated by the decomposition of the organic peroxide is extremely small. Even if a relatively large amount of the quinoline compound and dehydrochlorination inhibitor are blended, it has little effect on the degree of crosslinking, and a chlorinated polyethylene composition with excellent heat resistance can be obtained. The chlorinated polyethylene composition obtained by the present invention not only has excellent heat resistance but also
It has the following characteristics (effects). (1) Good weather resistance and durability. (2) Excellent compression set and ozone resistance. (3) Good oil resistance, fuel oil resistance, and chemical resistance. Since the chlorinated polyethylene composition obtained by the present invention has the excellent characteristics described above, it can be used in various fields, and a typical example of its use is in vehicle parts such as automobiles. ,
Examples include wire covering materials and general industrial parts (eg, heat-resistant packing).

Claims (1)

[Scope of Claims] 1 (A) 100 parts by weight of chlorinated polyethylene, (B) metal oxide and hydrotalcite group 1.0
~15.0 parts by weight, (C) 0.1 to 20.0 parts by weight of an organic peroxide, and (D) 0.05 to 5.0 parts by weight of a quinoline compound, and the total amount of the metal oxide and hydrotalcite group A chlorinated polyethylene composition in which the proportion of hydrotalcite group is 1.0 to 80% by weight.