JPH0221418B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention has improved properties such as excellent low-temperature falling weight impact resistance, excellent internal hydraulic fracture resistance at high temperatures, excellent chemical resistance, excellent heat resistance, excellent weather resistance, and excellent practical durability. The present invention relates to a post-chlorinated vinyl chloride resin/vinyl chloride resin/elastomer-based molding resin composition that can exhibit unique characteristics that combine these excellent properties in a well-balanced manner. More specifically, the present invention provides the following (i) and (ii) (i) 55 to 70 parts by weight of post-chlorinated vinyl chloride resin (preferably 55 to 65 parts by weight) (ii) 30 parts by weight of vinyl chloride resin ~45 parts by weight (preferably 35 to 45 parts by weight) for a total of 100 parts by weight, the following (iii) and (iv) (iii) post-chlorinated polyethylene elastomer 2 parts by weight to less than 6 parts by weight (preferably 2 parts by weight) ~5 parts by weight) (iv) 2 to 7 parts by weight of an elastomer selected from the group consisting of acrylic elastomers and MBS elastomers, provided that the total of (iii) and (iv) above is 5.5 parts to 12 parts by weight, The present invention relates to a post-chlorinated vinyl chloride molding resin composition comprising: Conventionally, post-chlorinated vinyl chloride resin/vinyl chloride resin/
Regarding elastomer-based resin compositions and molded products thereof, several proposals are known ranging from post-chlorinated vinyl chloride resin-rich compositions to vinyl chloride resin-rich compositions, and depending on the purpose of improvement of each proposal. Combinations of various composition ratios and elastomer types have been proposed. However, it cannot be avoided that each has advantages and disadvantages, and it is extremely difficult to provide a resin composition that exhibits satisfactory impact resistance, heat resistance, and other properties even under severe usage conditions, and that has a good balance of these properties. The reality is that it is difficult. For example, in Japanese Patent Publication No. 45-27905, impact resistance,
For the purpose of providing a resin composition having heat resistance and good processability, 95 to 50 parts by weight of post-chlorinated polyvinyl chloride and 5 to 50 parts by weight of polyvinyl chloride or a copolymer mainly composed of vinyl chloride. A three-component post-chlorinated vinyl chloride resin composition has been proposed in which 1 to 50 parts by weight of an acrylonitrile/butadiene/styrene copolymer (ABS/elastomer) is blended with 100 parts by weight of a mixture of There is. However, this proposal does not disclose at all the elastomers (iii) and (iv) specified in the present invention, nor their combinations. This proposed resin composition has, for example, poor weather resistance, and does not show impact resistance that can be used in practical use in an impact resistance test such as an impact resistance test after a weather resistance test. Furthermore, in addition to the disadvantage of poor chemical resistance, the results of practical durability tests are also unsatisfactory, and there is a disadvantage that it cannot be put to practical use in applications exposed to relatively harsh usage conditions. Furthermore, JP-A-54-22454 discloses that post-chlorinated resins are used to improve impact resistance, processability during molding, compatibility with post-chlorinated vinyl chloride resins, weather resistance, and other mechanical properties. Impact resistance improvers have been proposed for mixed resins in which vinyl chloride resins or post-chlorinated vinyl chloride resins account for 50% by weight or more, such as mixed resins of post-chlorinated vinyl chloride resins and polyvinyl chloride resins. According to this proposal, the improving agent to be blended in an amount of about 2 to about 10% by weight based on the total resin polymerization of the resin composition includes ethylene, propylene, and diene having a weight average molecular weight ratio of about 4 or less. Impact resistance modifiers have been proposed that contain as an active ingredient a vinyl chloride graft suspension copolymer in which a polymer elastomer is used as a backbone polymer and vinyl chloride is used as a graft monomer. However, this proposal does not mention the elastomers (iii) and (iv) specified in the present invention, or their combination, and there is no mention of low-temperature drop weight impact resistance, chemical resistance, practical durability, etc. Further improvement is desired in terms of resistance under harsh conditions. Furthermore, JP-A-55-127455 discloses that the content of chlorinated polyvinyl chloride is 70 to 84% by weight based on the total amount of chlorinated polyvinyl chloride and polyvinyl chloride, and the content of polyvinyl chloride is 30 to 84% by weight. A chlorinated vinyl chloride resin molded product has been proposed in which a 16% by weight chlorinated vinyl chloride resin composition is molded at a molding temperature of 190 to 220°C. According to this proposal, a molded product having particularly excellent hot water resistance can be obtained, and even if the amount of polyvinyl chloride is less than 16% by weight or more than 30% by weight, the effect of this proposal is particularly high. It states that it becomes difficult to obtain excellent hot water resistance. Furthermore, this proposal states that the chlorinated vinyl chloride resin composition may contain a small amount of elastomer to improve impact resistance, and the total amount of chlorinated polyvinyl chloride and polyvinyl chloride is 100%.
It is stated that 10 parts by weight or less of ABS resin is suitable. The above (iii) and (iv) specified in the present invention also in this proposal.
Neither the elastomer nor the combination thereof is disclosed at all, and the use of vinyl chloride resin exceeding 30 parts by weight is actively excluded. This proposed composition has inferior chemical resistance, poor weather resistance and poor practical durability, and has defects that make it impractical for applications exposed to relatively harsh usage conditions. Another known proposal is Japanese Patent Application Laid-Open No. 117519/1983 regarding cable protection pipes for underground cables. This proposal includes a resin composition that is made of polyvinyl chloride resin mixed with appropriate amounts of chlorinated polyvinyl chloride resin and a weather-resistant impact reinforcement agent, which has excellent heat resistance, impact resistance, and weather resistance. A cable protection pipe for underground cables is claimed. Then, an acrylic elastomer is described as the weather-resistant impact strength agent, and regarding the amount of the resin and acrylic elastomer, CPVC (chlorinated polyvinyl chloride) is PVC)
The proportion of CPVC and impact strengthener is 15 to 50 parts by weight.
It is stated that the amount of the impact strengthener is in the range of 5 to 20 parts by weight per 100 parts by weight of a resin composition containing 85 to 50 parts by weight of PVC. This proposal does not mention the above-mentioned (iii) elastomer specified in the present invention, and (iii) and (iv)
Of course, there is no disclosure whatsoever regarding the use of an elastomer in combination.Furthermore, as mentioned above, the composition of the polyvinyl chloride resin rich in which the amount of chlorinated polyvinyl chloride resin used is 50 parts by weight or less based on 100 parts by weight of the resin composition. things are recommended. However, this type of composition has unsatisfactory internal hydraulic fracture resistance and chemical resistance at high temperatures, has poor weather resistance, has insufficient practical durability, and is exposed to relatively harsh conditions. There are drawbacks that make it impractical for use. Moreover, a cable protection tube for underground cables is also proposed in Japanese Patent Application Laid-Open No. 117520/1983. This proposal includes adding 6 parts by weight of chlorinated polyethylene to 100 parts by weight of a mixture of vinyl chloride resin and post-chlorinated vinyl chloride resin in a weight ratio of 4:6 to 6:4. A cable protection tube for underground cables has been proposed which is made of the above composition and is added in an amount of 12 to 20 parts by weight based on 100 parts by weight of the post-chlorinated vinyl chloride resin. This proposal does not disclose at all the elastomer (iv) specified in the present invention, nor does it mention anything about the combination of the elastomers (iii) and (iv). This proposed composition has poor internal hydraulic rupture resistance at high temperatures, and is also unsatisfactory in weather resistance.
The results of practical durability tests were also poor, and there are drawbacks that make it impractical for applications that are exposed to relatively harsh usage conditions. The present inventors aimed to develop a composition capable of overcoming the technical problems that are desired to be improved in post-chlorinated vinyl chloride resin/vinyl chloride resin/elastomer molding resin compositions as described above. I have been conducting research. As a result, a total of 100
selected from the group consisting of (iii) post-chlorinated polyethylene elastomer and (iv) acrylic elastomer and MBS elastomer, each in a specified amount range proportion to parts by weight, and whose total amount satisfies the specified amount range. Excellent low-temperature falling weight impact resistance due to the compound elastomer composition,
Excellent internal water pressure rupture resistance at high temperatures, excellent chemical resistance,
It is a post-chlorinated vinyl chloride rich material that has improved properties such as excellent heat resistance, excellent weather resistance, and excellent practical durability, and can exhibit unique properties that combine these excellent properties in a well-balanced manner. It has been discovered that a post-chlorinated vinyl chloride molding resin composition can be provided. Therefore, an object of the present invention is to provide a post-chlorinated vinyl chloride molding resin composition that has excellent improved properties. The above objects and many other objects and advantages of the present invention will become more apparent from the following description. Examples of the (i) post-chlorinated vinyl chloride resin used in the present invention include those with a chlorine content of about 60 to 70% by weight and a specific viscosity (according to JIS K6721) of about 0.20 to 0.70. It can be produced by chlorinating a powder in the gas phase, suspended in water, or dissolved in a solvent. The method of chlorinating vinyl chloride resin is well known, for example, Japanese Patent Publication No. 36-888 and Japanese Patent Publication No. 45
It is explained in detail in Publication No.-30833. In addition to vinyl chloride homopolymers, examples of vinyl chloride resins used to produce the post-chlorinated vinyl chloride resin include vinyl chloride copolymers with other comonomers copolymerizable with vinyl chloride. Coalescent resins may be mentioned. At this time, the amount of the comonomer used is about 15 parts by weight or less, based on 100 parts by weight of vinyl chloride monomer.
Preferably, the amount is about 6 parts by weight or less. Examples of such other copolymerizable monomers that can be used include, for example, vinyl esters such as vinyl acetate, vinyl propionate, and vinyl laurate; acrylic esters such as methyl acrylate, ethylene acrylate, and butyl acrylate; Methacrylic acid esters such as acrylate and ethyl methacrylate; Maleic acid esters such as dibutyl maleate and diethyl maleate; Fumaric acid esters such as dibutyl fumarate and diethyl fumarate; Vinyl methyl ether, vinyl butyl ether, vinyl octyl Vinyl ethers such as ether; vinyl cyanides such as acrylonitrile and methacrylonitrile; olefins such as ethylene, propylene, and n-butene; vinylidene halides or vinyl halides other than vinyl chloride such as vinylidene chloride and vinyl bromide;
etc. can be given. Examples of the vinyl chloride resin (ii) used in the present invention include vinyl chloride homopolymer as well as the vinyl chloride copolymer used to form the vinyl chloride resin used in the production of the post-chlorinated vinyl chloride resin. Examples of other polymerizable monomers include vinyl chloride copolymer resins with other comonomers similar to those exemplified. The amount of these comonomers used is also approximately 100 parts by weight of vinyl chloride monomer.
Preferably, the amount is 15 parts by weight or less. Furthermore, (iii) post-chlorinated polyethylene elastomer and its manufacturing method used in the present invention are also known,
Examples of such post-chlorinated polyethylene elastomers include post-chlorinated polyethylene elastomers preferably having a chlorine content of about 20 to 45% by weight, more preferably about 30 to 40% by weight. The post-chlorinated polyethylene elastomer is preferably amorphous. Such post-chlorinated polyethylene elastomers are available on the market, such as Elasthren 301A, 351A, 401A (Showa Denko K.K.).
Daisolatsuku H-135 (manufactured by Osaka Soda Co., Ltd.);
Examples include CPE-3614 and CPE-3615 (manufactured by Tau Chemical Co., Ltd.). Furthermore, (iv) the acrylic elastomer used in the present invention and its production method are also known and can be used in the present invention. Acrylic elastomer is a multicomponent resin made by graft polymerizing monomers such as methyl methacrylate, styrene, and acrylonitrile to copolymer rubber mainly composed of acrylic esters.
The method for producing this multi-component resin is already known, for example, Japanese Patent Publication No. 51-5674,
28117, JP-A-50-8819, JP-A-50-88169, JP-A-50-98951, etc. The manufacturing method will be explained in more detail using an example. For the acrylic ester that is the main component of the copolymer rubber, at least 80% by weight of an acrylic alkyl ester or an acrylic alkyl ester in which the alkyl group has 2 to 8 carbon atoms is used, and monovinylidene that can be copolymerized with this is used. A compound and a polyfunctional crosslinker are reacted to first form an aqueous dispersion of a rubbery copolymer. Next, a methacrylic acid alkyl ester having an alkyl group having 1 to 4 carbon atoms, a vinyl aromatic compound, an unsaturated nitrile, and A multicomponent resin is obtained by graft polymerization of 20 to 80 parts by weight of all or a mixture of 2 to 3 monomers containing a monovinylidene group copolymerizable with these monomers. Such acrylic elastomers are available on the market, for example Kureha HIA-15, HIA-
28 (manufactured by Kureha Chemical Co., Ltd.); Kane Ace FM (Kanebuchi Chemical Co., Ltd.)
(manufactured by Mitsubishi Rayon Co., Ltd.); Metablane W-300, Metablane W-529 (manufactured by Mitsubishi Rayon Co., Ltd.), and the like. Furthermore, (iv) MBS/elastomer used in the present invention and its manufacturing method are known and can be used in the present invention. For example, in rubber whose main component is butadiene,
Examples include multicomponent resins obtained by graft polymerization of methyl methacrylate, styrene, and the like. like this
(iv) MBS/elastomers are available on the market, such as Metablen C-223 (manufactured by Mitsubishi Rayon Co., Ltd.);
Examples include Kureha BTANX (manufactured by Kureha Chemical Co., Ltd.); Kane Ace B-56 (manufactured by Kanebuchi Chemical Co., Ltd.). In the post-chlorinated vinyl chloride molding resin composition of the present invention, for the composite resin component consisting of (i) post-chlorinated vinyl chloride resin component and (ii) vinyl chloride resin component as exemplified above, , (iii) a post-chlorinated polyethylene elastomer and (iv) an elastomer selected from the group consisting of acrylic elastomers and MBS elastomers. If (iii) the post-chlorinated polyethylene elastomer is omitted from the composite elastomer component, it will be difficult to combine the excellent properties of the composition of the present invention in a well-balanced manner; for example, chemical resistance will be significantly deteriorated; Furthermore, the weather resistance tends to be significantly lowered, and in addition, the practical durability is unsatisfactory, so that it cannot be used practically under relatively harsh conditions. Furthermore, if (iv) an elastomer selected from the group consisting of acrylic elastomer and MBS elastomer is omitted from the composite elastomer component, it is similarly difficult to combine the excellent properties of the composition of the present invention in a well-balanced manner. For example, internal hydraulic rupture resistance at high temperatures is markedly reduced, heat resistance tends to decline, and weather resistance and practical durability are significantly deteriorated, making it unusable for practical use under relatively harsh conditions. The result is completely unsatisfactory. Therefore, in the present invention, it is essential to use a composite elastomer component consisting of the above (iii) and (iv), and the combination of these two elastomer components is the same as the above (i).
It interacts with the resin component consisting of (ii) and (ii) to help the four-component composition of the present invention exhibit the above-mentioned excellent properties in a well-balanced manner. The mechanism by which the individual components in a multi-component composition that requires these four components have the combination of the above-mentioned properties on the composition is unknown, but as will be shown later with examples and comparative examples. This was a completely unexpected result, which could not have been predicted based on the knowledge of the prior art that impact resistance is improved by adding an elastomer. Furthermore, in the composition of the present invention, the above-mentioned 4
The combination of components shows a well-balanced combination of excellent low-temperature falling weight impact resistance, excellent internal hydraulic fracture resistance at high temperatures, excellent chemical resistance, excellent heat resistance, excellent weather resistance, and excellent practical durability. In order to best exhibit the unique properties, the combination of the above ingredients as well as their relative amounts are important factors. As the amount ratio, the following amount ratio is selected. (i) Cl-PVC 55 to 70 parts by weight (preferably 55 to 65 parts by weight) (ii) PVC 30 to 45 parts by weight (preferably 35 to 45 parts by weight) for a total of 100 parts by weight, (iii) Cl-PE 2 parts by weight to less than 6 parts by weight (preferably 2 to 5 parts by weight) (iv) Acrylic and/or MBS 2 to 7 parts by weight However, the total of (iii) + (iv) is 5.5 parts by weight parts to 12 parts by weight. Further, in the above amount ratio, it is advantageous that the following amount conditions (a) and (b) are further satisfied. (a) The weight ratio of (iii):(iv) is 1:1 to 2 (b) The amount of (iii) is (i)
11 parts by weight or less per 100 parts by weight In the above, Cl-PVC is post-chlorinated vinyl chloride resin, PVC is vinyl chloride resin, Cl-PE is post-chlorinated polyethylene elastomer, Acrylic and/or MBS Acrylic elastomer and
Refers to an elastomer selected from the group consisting of MBS and elastomers. The above-mentioned proportions in the post-chlorinated vinyl chloride molding resin composition of the present invention affect each other among the multiple components constituting the multi-component composition of the present invention.
Although it is not possible to unambiguously state the technical significance of the amount of a single component, its tendency will be explained below. In the composition of the present invention, (i) Cl-PVC and (ii) PVC
If the amount of Cl-PVC exceeds the above range and is too small in the composite resin component consisting of It has become difficult to combine impact resistance, excellent weather resistance, excellent moldability, and excellent secondary processability (bending processability, adhesion, and fusion properties) with other excellent properties in a well-balanced manner. Also, if the amount of Cl-PVC exceeds the above range and is too small, that is, if the amount of PVC exceeds the above range and exceeds the above range, the excellent internal water pressure resistance of the composition of the present invention at high temperatures may be reduced. , it tends to be difficult to combine excellent heat resistance, excellent chemical resistance, etc. with other excellent properties in a well-balanced manner. Therefore,
In the present invention, it is necessary to satisfy the amount ranges of (i) Cl-PVC and (ii) PVC. Furthermore, in the composition of the present invention, (iii) Cl-PE and (iv)
If the amount of Cl-PE in the composite elastomer component consisting of acrylic and/or MBS is too excessive, such as 6 parts by weight or more, the composition of the present invention may have excellent hydrostatic strength at high temperatures, excellent mechanical strength, and excellent melting properties. It is difficult to combine adhesion properties, excellent heat resistance, etc. with other excellent properties in a well-balanced manner, and if the amount of Cl-PE is too small (less than 2 parts by weight), the composition of the present invention will deteriorate. It becomes difficult to combine excellent chemical resistance, weather resistance, etc. with other excellent properties in a well-balanced manner. On the other hand, if the amount of Acrylic and/or MBS exceeds 7 parts by weight and is too excessive, the excellent chemical resistance, excellent mechanical strength, excellent weather resistance, excellent heat resistance, etc. of the composition of the present invention may be impaired. It is difficult to combine these properties in a well-balanced manner with the excellent properties of
If the amount of Acrylic and/or MBS is too small, less than 2 parts by weight, the composition of the present invention, such as excellent low-temperature drop weight impact resistance and excellent mechanical properties, may be well-balanced with other excellent properties. It is difficult to obtain such a composition. Furthermore, the above (iii) Cl-PE and (iv) Acrylic and/or
The composite elastomer component consisting of MBS is
The total amount of (iii) + (iv) is used in a range of 5.5 parts by weight to 12 parts by weight, based on 100 parts by weight of the composite resin component consisting of Cl--PE and (ii) PVC. If the total amount exceeds the above range, the composition of the present invention will have excellent water pressure resistance at high temperatures, excellent chemical resistance, excellent heat resistance, excellent weather resistance, and excellent mechanical strength. It is difficult to have excellent secondary processability (adhesiveness, fusion bondability, bending processability), etc. in a well-balanced manner along with other excellent properties, and if the amount exceeds the above range and is too small, the property will deteriorate. It is difficult to combine the excellent falling weight impact resistance at low temperatures, excellent mechanical strength, excellent secondary processability, etc. of the composition of the invention with other excellent properties in a well-balanced manner. Therefore, (iii) Cl-PE and (iv) Acrylic and/or MBS are each used in amounts that satisfy the above amount range and total amount range. In a preferred embodiment of the composition of the present invention, the composition further comprises:
It is preferable that the suitable amount conditions (a) and (b) are also satisfied. By satisfying these suitable amount conditions, it is possible to provide the composition of the present invention which has the most excellent properties in the most preferable balance. The post-chlorinated vinyl chloride molding resin composition of the present invention includes (i) Cl-PVC, (ii) PVC, (iii)
It can be produced by mixing Cl--PE and (iv) Acrylic and/or MBS, as well as other additives if desired, simultaneously or in any order.
The mixing means can be selected and used as appropriate, and it is preferable to select a mixing means that can mix the above-mentioned components as uniformly as possible. Mixing can be carried out using, for example, a high-speed mixer such as a Henschel mixer or a Spar mixer, a ribbon blender, a Banbury mixer, a continuous kneader, a mixing roll, or a Laikaiki mixer. As for the mixing method, it is preferable that each component is put into the above-mentioned mixer and uniformly blended at a temperature of, for example, 210° C. or less for a time appropriate for each mixer. The post-chlorinated vinyl chloride molding resin composition of the present invention comprises (i) Cl-PVC, (ii) PVC, (iii) Cl-PE and (iv)
In addition to the four essential components of Acrylic and/or MBS,
Various other additives may be included. Examples of such additives include stabilizers, lubricants, antioxidants, fillers, ultraviolet absorbers, and colorants. Specific examples of these additives include, for example:
Inorganic salts such as tribasic lead sulfate and dibasic lead phosphite; lead stabilizers; tin-based compounds such as butyltin malate, butyltin laurate, butyltin mercaptide, octyltin malate, octyltin mercaptite, and methyltin mercaptide; Stabilizers such as metal soaps such as lead stearate, cadmium stearate, zinc stearate, calcium stearate, paraffin wax, microcrystal wax, polyethylene wax, fatty acids, fatty acid amides, fatty acid esters, Lubricants such as fatty acid ketones, fatty alcohols, partial ester waxes of fatty acids; e.g. phenyl-α
- Naphthylamine series such as naphthylamine, phenyl-β-naphthylamine, aldol-α-naphthylamine, diphenylamine series such as P-isopropoxy-diphenylamine, N,N'-diphenyl-propylene diamine, 2,2,4-trimethyl-1, Polymer of 2-dihydroquinone, 6
-Ethoxy-2,2,4-trimethyl-1,2-
Quinoline series such as dihydroquinoline, 1-oxy-3-methyl-4-isopropylbenzene, 2,
Monophenols such as 6-di-tert-butyl-4-methylphenol, 4,4'-dihydroxydiphenyl, hindered, bisphenol, tris-(2-methyl-4-hydroxy-5-tert-butylphenyl) ) Polyphenols such as butane,
Antioxidants such as thiobisphenols such as 4-4′-thiobis-(6-tert-butyl-3-methylphenol); e.g. calcium carbonate,
Fillers such as aluminum silicate, aluminum hydroxide, magnesium carbonate, magnesium hydroxide, diatomaceous earth, wood flour, talc, silica, mica, etc.; salicylic acids such as phenyl salicylate, p-octylphenyl sacylate Derivative 2,4-dihydroxy benzophenone, 2
-benzophenones such as hydroxy-4-methoxy benzophenone, 2-(2'-hydroxy-5'-methyl-phenyl)benzotriazole,
Triazoles such as 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)benzotriazole, resorcinol monobenzoate, 2,4-di-tert-butyl phenyl-3,
UV absorbers such as 5-di-tert-butyl-4-hydroxybenzoate, methyl o-benzoylbenzoate; for example, titanium oxide, lead white, lithopone, barite, carbon black, cadmium red, red iron, silver vermilion, cadmium yellow Examples include coloring agents such as inorganic pigments, azo pigments, nitroso pigments, nitro pigments, basic dye lakes, phthalocyanine pigments, and the like. The amount of these additives to be used can be arbitrarily selected as long as the above-mentioned properties of the composition of the present invention are not substantially deteriorated. wt% stabilizer, approx. 0.5
- about 5% by weight lubricant, about 0 to about 2% by weight antioxidant, about 0 to about 10% by weight filler, about 0 to about 2% by weight ultraviolet absorber, about 0 to about 3% by weight. For example, the amount of the coloring agent used can be exemplified. The post-chlorinated vinyl chloride molding resin composition of the present invention exhibits the excellent improved properties as described above and also exhibits unique properties that combine these excellent properties in a well-balanced manner. In addition to being advantageous in the field of application of conventional vinyl chloride resin/vinyl chloride resin/elastomer compositions, it can also be used in applications that are exposed to relatively harsh usage conditions, where conventional compositions have been practically difficult to use. It can also be used to advantage. Therefore, in addition to fields of use such as industrial high-temperature chemical pipes, tanks, underground pipes, sewage pipes for hot waste water, chemical solution dissolvers used at high temperatures, etc., it can also be used, for example, as protection pipes for power cables, It can also be conveniently used in applications such as plating tanks and chlorine gas piping. Hereinafter, several examples of the compositions of the present invention will be illustrated in more detail by way of examples along with comparative examples. The tests and evaluations of low-temperature falling weight impact resistance, high-temperature internal hydraulic pressure resistance, chemical resistance, heat resistance, weather resistance, and practical durability are as follows. Test method and evaluation: - Preparation of test piece: - The following component composition (i) Cl-PVC (Nicatemp T-781; chlorine content
68wt%, average degree of polymerization 1000; Nippon Carbide Industries Co., Ltd. product) (ii) PVC (Nicabinyl SG-1100; average degree of polymerization
1000; Mitsubishi Chemical Industries, Ltd. product) (iii) Cl-PE (Elastrene 301A; chlorine content wt%;
Showa Denko Co., Ltd. product) (iv) Acrylic (HIA28; Kureha Chemical Industry Co., Ltd. product) MBS (BTANX; same as above) (v) Stabilizer (TVS# MA-300A; Butyltin stabilizer; Nitto Kasei Co., Ltd. product) (vi) Lubricant (Hiwax 200P; polyethylene
Wax-based lubricant (product of Mitsui Petrochemical Industries, Ltd.) was added to a 75 Henshil mixer at room temperature and mixed at high speed until the temperature reached 120°C.
Cool to 50°C to form a mixed composition (compound). The above compound was heated to a resin temperature of 160℃ using an extruder (RC-100 model manufactured by Ikegu Iron Works Co., Ltd.).
Extrusion molded at ~220℃, outer diameter 32mm, inner diameter
A test pipe of 25 mm and an average thickness of 3 mm is formed. Testing and Evaluation: - (a) Low temperature falling weight impact test. Test piece made by cutting the test pipe into a pipe length of 20cm
Prepare 30 pieces and cool them in a constant temperature bath at 0°C for 4 hours. A 6 kg weight is allowed to fall naturally onto the side of the tube of the test piece cooled to 0°C, and if the test piece does not break, 1
If the standard is high and the test piece breaks, lower the standard by one level, repeat this for 30 samples, and the test piece is 50
Find the height at which failure occurs with a probability of 50% (cm). The larger the value, the better the low-temperature falling weight impact resistance. (b) Internal hydraulic pressure fracture resistance test at high temperatures. A test piece obtained by cutting the test pipe into a pipe length of 50 cm is used. Seal one end of the pipe test piece with a saw jig, and use a water pressure machine from the other end to increase the pressure at a rate of 10.
Apply water pressure at a temperature of 60°C and ^measure the pressure at which the test piece breaks (Kg/cm ² ,
at 60℃). It is shown as the measured value. Condition the pipe in a 60°C water bath for 1 hour and test in the 60°C water bath.
The larger the value, the better the internal water pressure rupture resistance at high temperatures. (c) Chemical resistance test. Weigh (g) a test piece obtained by cutting the test pipe into a pipe length of 5 cm, and place this test piece on an oil bath for 60 g.
Immerse in 93% H ₂ SO ₄ warmed to °C. After being continuously immersed for 2 weeks under these conditions, take it out, wipe off the moisture on the surface with a washed and dry cloth, and immediately weigh the weight (g). Calculate the increase and express it as a percentage. The higher the number, the worse the chemical resistance.
The smaller the value, the better the chemical resistance. Furthermore, the appearance of the test piece after the immersion treatment is observed with the naked eye, and changes in appearance are judged according to the following evaluation criteria. Grade 1: No observable change compared to before immersion treatment. Grade 2: Slight discoloration is observed. Grade 3: Discolors to brown. Grade 4: Discolors to blackish brown. Grade 5: Discoloration to blackish tone and sweating phenomenon observed. The smaller the grade value, the better the chemical resistance. (d) Heat resistance test. 5 test pieces cut out from the pipe into 1 cm x 2 cm
With a load of Kg・f (5Kgf is force and is synonymous with Kg/cm ² ),
Tested in accordance with JIS K7206 (Vikat Softening Point Test Method for Thermoplastic Plastics), and the Vikatsu Softening Point (°C) is measured and shown. The larger the value, the better the heat resistance. (e) Weathering test. (e-1) W-OM (weather-o-meter) 100
Shyalpee test after hours. A test piece obtained by cutting the test pipe into a pipe length of 10 cm is used. After the test piece was irradiated for 100 hours with a weatherometer that sprayed the black panel at a temperature of 63 ± 2°C for 18 minutes at 180 minute intervals, a Charpy impact strength test piece was cut out from the treated test piece.
Shall py impact strength (Kg・cm/
cm ² ) is measured and shown. The higher the number, the more W-O
-Excellent weather resistance as determined by Shape test after M100hr. (e-2) Drop weight test after 400 hours of W-O-M. Test piece made by cutting the test pipe into a pipe length of 20cm
30 specimens were prepared, and these specimens were heated at a black panel temperature of 63 ± 2°C, with a spray cycle of 18 at 180 minute intervals.
Irradiate for 400 hours with a weather meter under the condition of spraying for 400 hours. A falling weight impact resistance test was conducted on each of the treated test pieces in the same manner as in (a) above, and
The fracture height (cm) was actually measured and expressed as the arithmetic mean value (cm) of the fracture heights of 30 test pieces. The larger the value, the better the weather resistance as determined by the drop weight test after 400 hours of W-O-M. (f) Practical durability test. Chlorine gas at 40°C to 60°C is supplied via a 5m long test pipe. The test pipe was installed outdoors for one year from mid-August to mid-August of the following year.
The above chlorine gas supply piping was subjected to a practical durability test. After the test, a test pipe with a pipe length of 5 cm was cut from near the center of the tested test pipe, and the pipe was compressed at a speed of 10 mm/min from the circumferential direction at a measurement temperature of 25°C, and the pipe was broken. The amount of deformation (cm) of the pipe was actually measured. The deformation length (cm) of the pipe is determined from the difference between the pipe length before the compression test and the pipe length at the time of failure, and the amount of deformation relative to the pipe length before the compression test is expressed as a percentage. Deformation amount is 50%
In the above cases, evaluate without destroying. The larger the amount of deformation, the better the practical durability. Examples 1 to 3 and Comparative Examples 1 to 5 Cl-PVC, PVC, Cl- described in the section of preparation of the test piece with the component composition and amount shown in Table 1 below
Compositions with PE, Acrylic or MBS, stabilizers and lubricants were prepared and tested according to the test methods and evaluations described above. The results are shown in Table 1 below.

【table】

[Table] Examples 4 to 7 The composition was prepared in the same manner as Examples 1 to 3, except that the type and amount of Cl-PVC, PVC, Cl-PE, MBS, and Acrylic were changed as shown in Table 2. I got something. The results are shown in Table 2 below.

【table】

【table】

Claims (1)

[Claims] 1 The following (i) and (ii) (i) Post-chlorinated vinyl chloride resin 55 parts by weight to 70 parts by weight (ii) Vinyl chloride resin 30 parts by weight to 45 parts by weight, to a total of 100 parts by weight In contrast, the following (iii) and (iv) (iii) Post-chlorinated polyethylene elastomer from 2 parts by weight to less than 6 parts by weight (iv) Elastomer selected from the group consisting of acrylic elastomer and MBS elastomer from 2 parts by weight to 7 parts by weight Parts by weight: However, the total of (iii) and (iv) above is 5.5 parts by weight to 12 parts by weight, and the weight ratio of (iii):(iv) is 1:1 to 2.
A post-chlorinated vinyl chloride molding resin composition comprising the following. 2. The composition according to claim 1, wherein the amount of (iii) is 11 parts by weight or less based on 100 parts by weight of (i) post-chlorinated vinyl chloride resin.