JPH10231410A - Rigid vinyl chloride resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pipe excellent in impact resistance, mechanical strengths, heat resistance and long-term running performances by melt-extruding a composition obtained by adding a heat stabilizer, etc., to a vinyl chloride resin obtained by grafting vinyl chloride onto a specified acrylic copolymer by suspension polymerization and having a specified degree of polymerization into a pipe. SOLUTION: 0.2-7 pts.wt. heat stabilizer, 0.1-5 pts.wt. stearic acid, 0.1-5 pts.wt. calcium stearate and 0.1-10 pts.wt. processing aid are added to 100 pts.wt. resin having a degree of polymerization of 800-2,000 and obtained by grafting 97-90wt.% vinyl chloride onto 3-10wt.% copolymer obtained by copolymerizing 100 pts.wt. acrylic monomer mixture comprising 80-100wt.% alkyl (meth)acrylate monomer and 0-20wt.% monomer which give homopolymers having glass transition points of -20 deg.C or below and -20 deg.C or above, respectively (e.g. n-butyl acrylate) with 0.1-10 pts.wt. polyfunctional monomer (e.g. trimethylolpropane triacrylate), and the resulting mixture is extruded into a pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid vinyl chloride resin tube.

[0002]

2. Description of the Related Art A vinyl chloride resin composition has mechanical strength,
Since it is a material excellent in weather resistance, chemical resistance, etc., it is widely used for building members, pipework equipment, housing materials and the like.
However, since the vinyl chloride resin composition has poor impact resistance, various modification methods have been proposed.

[0003] For example, as a method for improving impact resistance, chlorinated polyethylene (CP)
E), a method in which a rubber-based resin such as methyl methacrylate-butadiene-styrene copolymer (MBS), acrylic rubber or the like is compounded as an impact resistance reinforcing agent, and molded.

However, when a vinyl chloride resin composition containing an impact resistance enhancer is melt-extruded into a tubular shape to produce a hard vinyl chloride resin tube, when CPE is added, the low-temperature impact resistance becomes poor, and sufficient There is a problem that the molding temperature width at which a high impact resistance can be obtained becomes very narrow. When MBS is blended, there are problems such as a significant decrease in impact resistance after the exposure test and an increase in load during molding. When the acrylic rubber is compounded, it is difficult to uniformly disperse the particles at the time of molding, and there is a drawback that the impact resistance of the vinyl chloride resin becomes uneven depending on the processing conditions.

[0005] Further, the impact resistance of a rigid vinyl chloride-based resin pipe formed by melt extrusion from a vinyl chloride resin composition containing an impact-resistant reinforcing agent is not sufficient.

JP-A-62-36412 discloses a vinyl chloride resin composition obtained by graft-polymerizing vinyl chloride to a specific acrylic copolymer. But,
Using the vinyl chloride-based resin composition disclosed herein, a hard vinyl chloride-based resin tube obtained by melt-extruding the same into a tubular shape has improved impact resistance, but has reduced mechanical strength and heat resistance. There is a disadvantage that. Furthermore, the resulting hard vinyl chloride resin tube has a surface condition (gloss and smoothness)
However, there is a problem that the method is not sufficiently satisfactory and does not have a stable long-term running property.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to provide a hard vinyl chloride resin pipe which is excellent in impact resistance, mechanical strength and heat resistance and which is excellent in appearance. It is another object of the present invention to provide a hard vinyl chloride-based resin tube which is excellent in the above various properties and also excellent in long-term running property.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an alkyl (meth) acrylate monomer having a glass transition temperature of less than -20 DEG C. of 80 to 100% by weight and a homopolymer having a glass transition temperature of -20 DEG C. or more. Monomer 2
0 to 0% by weight of an acrylic mixed monomer (a-
1) 100 parts by weight of polyfunctional monomer (a-2)
By graft copolymerizing 97 to 90% by weight of vinyl chloride (b) with 3 to 10% by weight of an acrylic copolymer (a) obtained by copolymerizing 1 to 10 parts by weight by suspension polymerization. With respect to 100 parts by weight of the obtained vinyl chloride resin (A) having a degree of polymerization of 800 to 2,000,

Heat stabilizer (B) 0.2-7 parts by weight, stearic acid (C) 0.1-5 parts by weight, calcium stearate (D) 0.1-5 parts by weight, and processing aid (E) 0.1
It can be achieved by a rigid vinyl chloride resin tube obtained by melt-extruding a vinyl chloride resin composition containing 10 to 10 parts by weight into a tube.

In the present invention, among the monomers used for the acrylic mixed monomer (a-1), the alkyl (meth) acrylate monomer having a glass transition temperature of a homopolymer of less than -20 ° C. is not particularly limited. ,
Ethyl acrylate, n-propyl acrylate, isobutyl acrylate, n-butyl acrylate, sec
-Butyl acrylate, n-hexyl acrylate, 2
-Ethylhexyl acrylate, n-octyl (meth)
Examples include acrylate, isooctyl acrylate, n-decyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl acrylate, lauryl (meth) acrylate, and 2-acryloyloxyethyl succinic acid. These may be used alone or in combination of two or more.

The above homopolymer has a glass transition temperature of -2.
The content of the alkyl (meth) acrylate monomer having a temperature of less than 0 ° C is 80 to 80% in the acrylic mixed monomer (a-1).
100% by weight. When the content is less than 80% by weight, it is difficult to obtain impact resistance, so the content is limited to the above range.

Further, an acrylic mixed monomer (a-1)
Among the monomers used in (1), the monomer having a glass transition temperature of a homopolymer of −20 ° C. or higher is not particularly limited. For example, methyl (meth) acrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n- Alkyl (meth) such as butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, t-butyl methacrylate, n-hexyl methacrylate, cyclohexyl methacrylate, lauryl acrylate, myristyl (meth) acrylate, palmityl (meth) acrylate, and stearyl (meth) acrylate Acrylates: Polarity such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 2-acryloyloxyethyl phthalic acid Containing vinyl monomers; styrene,
aromatic vinyl monomers such as α-methylstyrene and vinyltoluene; unsaturated nitriles such as acrylonitrile and methacrylonitrile; vinyl esters such as vinyl acetate and vinyl propionate. These may be used alone or in combination of two or more.

The above homopolymer has a glass transition temperature of -2.
The monomer having a temperature of 0 ° C. or higher can arbitrarily adjust the glass transition temperature of the obtained acrylic copolymer (a). The content of the homopolymer having a glass transition temperature of −20 ° C. or higher is determined by the amount of the acrylic mixed monomer (a-
In 1), the content is 0 to 20% by weight. If the content exceeds 20% by weight, impact resistance cannot be obtained, so that the content is limited to the above range.

The polyfunctional monomer (a-2) is not particularly restricted but includes, for example, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, 1,6 Di (meth) acrylates such as hexanediol di (meth) acrylate and trimethylolpropane di (meth) acrylate; trimethylolpropane tri (meth) acrylate, ethylene oxide-modified trimethylolpropane tri (meth) acrylate, pentaerythritol tri ( Tri (meth) acrylates such as meth) acrylate; pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, diallyl phthalate, diallyl maleate, diallyl phthalate , Diallyl succinate, diallyl compounds such as triallyl isocyanurate and triallyl compounds, divinyl benzene, divinyl compounds such as butadiene and the like. These may be used alone or in combination of two or more.

In the present invention, the acrylic copolymer obtained by copolymerizing 100 parts by weight of the acrylic mixed monomer (a-1) and 0.1 to 10 parts by weight of the polyfunctional monomer (a-2) is used. Use coalescence (a). When the content of the polyfunctional monomer (a-2) is less than 0.1 part by weight, it is difficult to obtain impact resistance as the crosslinking density decreases, and when it exceeds 10 parts by weight, the crosslinking density increases. Therefore, it becomes difficult to obtain impact resistance and tensile strength, so that the above range is limited. Preferably, it is 0.1 to 8 parts by weight.

The method for obtaining the acrylic copolymer (a) is not particularly limited, and examples thereof include an emulsion polymerization method and a suspension polymerization method. Considering the impact resistance, the emulsion polymerization method is preferred.

In the emulsion polymerization method, an emulsifying dispersant is added for the purpose of improving the dispersion stability of the above-mentioned acrylic mixed monomer in an emulsion and effecting the polymerization efficiently. The emulsifying and dispersing agent is not particularly limited. For example, anionic surfactants such as polyoxyethylene nonylphenyl ether sulfate (trade name “Hitenol N-08” manufactured by Daiichi Kogyo Seiyaku Co., Ltd.); Nonionic surfactants Agents; partially saponified polyvinyl alcohol; cellulosic dispersants; gelatin and the like.

In the emulsion polymerization method, a polymerization initiator is used. The polymerization initiator is not particularly limited and includes, for example, water-soluble polymerization initiators such as potassium persulfate, ammonium persulfate, and hydrogen peroxide; benzoyl peroxide;
Organic peroxides such as lauroyl peroxide; azo initiators such as azobisisobutyronitrile; Further, if necessary, a pH adjuster, an antioxidant, and the like may be added.

The emulsion polymerization method is not particularly limited.
From the difference in the method of adding the monomer, for example, a batch polymerization method,
Examples include a monomer dropping method and an emulsion dropping method.
The batch polymerization method is, for example, in a jacketed polymerization reactor,
Pure water, an emulsifying dispersant, a polymerization initiator, a mixed monomer composed of the acrylic mixed monomer and the polyfunctional monomer are added all at once, and the mixture is sufficiently emulsified by stirring under the conditions of oxygen removal by a nitrogen gas flow and pressurization. After that, polymerization is performed by heating the inside of the vessel with a jacket.

In the monomer dropping method, for example, pure water, an emulsifying dispersant, and a polymerization initiator are put into a jacketed polymerization reactor,
Under the conditions of oxygen removal and pressurization under a nitrogen stream,
First, after the inside of the vessel is heated by a jacket, the above-mentioned mixed monomer is dropped by a predetermined amount to gradually polymerize.

In the emulsion dropping method, for example, an emulsified monomer is prepared in advance by sufficiently emulsifying the above-mentioned mixed monomer, emulsifying dispersant and pure water with stirring, and then pure water and a polymerization initiator are introduced into a jacketed polymerization reactor. In this method, the vessel is first heated by a jacket under the conditions of oxygen removal and pressurization under a nitrogen stream, and then the above-mentioned emulsified monomer is dropped by a predetermined amount to carry out polymerization.

In the present invention, the acrylic copolymer (a) obtained by the above method is used, and 3 to 10% by weight of the acrylic copolymer (a) is added to vinyl chloride (b).
A vinyl chloride resin (A) having a degree of polymerization of 800 to 2,000 obtained by graft copolymerization of 97 to 90% by weight by suspension polymerization is used. The acrylic copolymer (a)
Is from 3 to 3 in the obtained vinyl chloride resin (A).
30% by weight. When the content is less than 3% by weight,
If it is difficult to obtain sufficient impact resistance, and if it exceeds 30% by weight, the mechanical strength such as bending strength and tensile strength becomes low. Therefore, it is limited to the above range, and preferably 3 to 20% by weight. is there.

The content of the vinyl chloride (b) is
90 to 97% by weight in the obtained vinyl chloride resin (A)
It is. If the content is less than 90% by weight, the mechanical strength such as bending strength and tensile strength will be low, and if it exceeds 97% by weight, it will be difficult to obtain sufficient impact resistance. , Preferably 92 to 97% by weight.

The average degree of polymerization of the vinyl chloride copolymer is from 800 to 2,000. When the average degree of polymerization is less than 800, it is difficult to obtain sufficient impact resistance. Conversely, when it exceeds 2,000, the load at the time of extrusion molding becomes high and extrusion molding becomes difficult. , Preferably 1000 to 1600.

The method for obtaining the vinyl chloride resin (A) is not particularly limited, and examples thereof include an emulsion polymerization method and a suspension polymerization method. Among them, the suspension polymerization method is preferred.
In the suspension polymerization method, a dispersant and an oil-soluble polymerization initiator are used for the purpose of improving the dispersion stability of the acrylic copolymer (a) and efficiently performing the graft copolymerization of vinyl chloride.

The dispersant is not particularly limited.
Examples include methylcellulose, ethylcellulose, hydroxypropylmethylcellulose, polyvinyl alcohol, partially saponified polyvinyl acetate, gelatin, polyvinylpyrrolidone, starch, and maleic anhydride-styrene copolymer. These may be used alone or in combination of two or more.

As the oil-soluble polymerization initiator, a radical polymerization initiator is preferably used from the viewpoint of being advantageous for graft copolymerization. The radical polymerization initiator is not particularly limited and includes, for example, lauroyl peroxide, t-butyl peroxypivalate, diisopropyl peroxydicarbonate, dioctyl peroxydicarbonate, t-butyl peroxy neodecanoate, α-cumene Organic peroxides such as luperoxy neodecanoate; 2,2-azobisisobutyronitrile, 2,2-azobis-2,4
-Azo compounds such as dimethylvaleronitrile. In the above suspension polymerization method, a pH adjuster, an antioxidant and the like may be added as necessary.

Specifically, for example, pure water, the acrylic copolymer (a), a dispersant, an oil-soluble polymerization initiator, and, if necessary, After the polymerization degree regulator was charged, the air in the polymerization vessel was discharged by a vacuum pump, and then vinyl chloride (b) and, if necessary, other vinyl monomers were charged under stirring conditions. The inside of the container is heated by a jacket, and graft copolymerization of vinyl chloride is performed.

Since the above vinyl chloride graft copolymerization is an exothermic reaction, the temperature in the reaction vessel can be controlled by changing the jacket temperature. After the completion of the reaction, unreacted vinyl chloride is removed to form a slurry, and the slurry is dehydrated and dried to produce the vinyl chloride resin (A).

In the present invention, the heat stabilizer (B) is used in an amount of from 0.2 to 100 parts by weight of the vinyl chloride resin (A).
7 parts by weight, 0.1 to 5 parts by weight of stearic acid (C), 0.1 to 5 parts by weight of calcium stearate (D), and 0.1 to 10 parts by weight of a processing aid (E) The vinyl resin composition is melt-extruded into a tubular shape to produce a hard vinyl chloride resin tube.

The heat stabilizer (B) is not particularly limited.
For example, organic tin-based stabilizers such as dibutyltin mercapto, dioctyltin mercapto, dimethyltin mercapto, dibutyltin malate, dibutyltin malate polymer, dioctyltin malate, dioctyltin malate polymer, dibutyltin laurate, and dibutyltin laurate polymer Lead-based stabilizers such as lead stearate, dibasic lead phosphite, and tribasic lead sulfate; calcium-zinc-based stabilizers; barium-zinc-based stabilizers; and barium-cadmium-based stabilizers. These may be used alone or in combination of two or more.

The heat stabilizer (B) is added in an amount of 0.2 to 7 parts by weight based on 100 parts by weight of the vinyl chloride resin (A). If the amount is less than 0.2 parts by weight, the thermal stability decreases, and extrusion molding becomes difficult. If the amount exceeds 7 parts by weight, the impact resistance and heat resistance decrease. It is limited and preferably 0.4 to 5 parts by weight.

The heat stabilizer (B) may be used in combination with a stabilizing aid. The stabilizing aid is not particularly limited, and includes, for example, epoxidized soybean oil, epoxidized tetrahydrophthalate, epoxidized polybutadiene, and phosphate ester. These may be used alone,
More than one species may be used in combination.

Further, stearic acid (C) acts as an internal lubricant and is mainly used for the purpose of accelerating the gelation of the molten resin at the time of extrusion molding, lowering the flow viscosity and preventing frictional heat generation. There is no particular limitation. The mixing amount of stearic acid (C) is 100
It is 0.1 to 5 parts by weight with respect to parts by weight. The amount is
When the amount is less than 0.1 part by weight, the appearance of the obtained resin tube is not good. On the contrary, when the amount exceeds 5 parts by weight, heat resistance is reduced. Parts by weight.

In addition, calcium stearate (D)
It acts as an external lubricant and is used mainly for the purpose of increasing the sliding effect between the molten resin and the metal surface during extrusion molding, and its grade is not particularly limited. The blending amount of the calcium stearate (D) is the same as that of the vinyl chloride resin (A) 1
It is 0.1 to 5 parts by weight with respect to 00 parts by weight. If the amount is less than 0.1 part by weight, the appearance of the obtained resin tube is not good, and if it exceeds 5 parts by weight, build-up problems and heat resistance during long-term extrusion are reduced, It is limited to the above range, and preferably 0.1 to 3 parts by weight.

Further, the processing aid (E) is not particularly limited as long as it promotes the gelation of the resin and improves the extrudability, and is, for example, an alkyl acrylate having a weight average molecular weight of 100,000 to 2,000,000. And acrylic processing aids such as alkyl methacrylate copolymers. Examples of the acrylic processing aid include an n-butyl acrylate-methyl methacrylate copolymer and a 2-ethylhexyl acrylate-methyl methacrylate-butyl methacrylate copolymer.

The amount of the processing aid (E) is 0.1 to 10 parts by weight based on 100 parts by weight of the vinyl chloride resin (A). If the compounding amount is less than 0.1 part by weight, the dispersibility is not good, it is difficult to promote the gelation of the resin uniformly, and the appearance of the obtained resin tube is not good. If the amount exceeds the above range, the moldability decreases, so that the amount is limited to the above range.

The vinyl chloride resin (A) includes:
If necessary, other lubricants, plasticizers, antioxidants,
Additives such as an ultraviolet absorber, a light stabilizer, an antistatic agent, a filler, and a pigment may be added.

Other lubricants include montanic acid wax, paraffin wax, polyethylene wax, stearyl alcohol, butyl stearate and the like. Examples of the plasticizer include dibutyl phthalate, di-2-ethylhexyl phthalate, di-2-
Ethylhexyl adipate and the like can be mentioned.

Examples of the antioxidant include phenolic antioxidants. Examples of the light stabilizer include a hindered amine-based light stabilizer and the like. Examples of the ultraviolet absorbent include salicylic acid ester-based, benzobunone-based, benzotriazole-based, and cyanoacrylate-based ultraviolet absorbers.

Examples of the filler include calcium carbonate, talc and the like. Examples of the pigment include organic pigments such as azo, phthalocyanine, sulene, and dye lakes; oxides, molybdenum chromates, sulfides, and the like.
Inorganic pigments such as selenide and ferrocyanide are exemplified.

In the present invention, the heat stabilizer (B) is used in an amount of from 0.2 to 100 parts by weight of the vinyl chloride resin (A).
7 parts by weight, stearic acid (B) 0.1 to 5 parts by weight, calcium stearate (D) 0.1 to 5 parts by weight, and a processing aid 0.1 to 10 parts by weight, for example, Mix by hot blending or cold blending to obtain a vinyl chloride resin composition, and melt extrude this composition into a tube using a single screw extruder or twin screw extruder to obtain a hard vinyl chloride resin tube. . The conditions for the melt extrusion molding are the same as the conventional conditions.

The vinyl chloride resin composition may further contain an acrylic polymer lubricant (F) having a weight average molecular weight of 10,000 to 500,000. The acrylic polymer lubricant (F) is used for the purpose of improving long-term running properties without impairing the appearance of a molded product, and its grade is not particularly limited.

The blending amount of the acrylic polymer lubricant (F) is preferably 0.01 to 5 parts by weight. The amount is 0.0
If the amount is less than 1 part by weight, there is no effect. If the amount is more than 5 parts by weight, a problem of deterioration in physical properties due to excessive lubrication occurs, so the amount is limited to the above range.

[0045]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

(Examples 1 to 4, Comparative Examples 1 to 14) According to the latex formulation and polymerization formulation shown in Tables 1 and 2, the acrylic copolymer (a) and vinyl chloride resin (A ) Got. <Preparation of Acrylic Copolymer (a)> In a reaction vessel equipped with a stirrer and a reflux condenser, pure water and an emulsifying dispersant (trade name “HITENOL N-08” manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) ( AS), ammonium persulfate (abbreviated as APS), n-butyl acrylate (abbreviated as BA), trimethylolpropane triacrylate (abbreviated as TMPTA), and oxygen in the vessel is replaced with nitrogen. The temperature of the reaction vessel was raised to 65 ° C. under stirring conditions, and the mixture was heated and stirred for 5 hours to obtain an acrylic copolymer (a) having a solid concentration of 30% by weight.

<Preparation of Vinyl Chloride Resin (A)> Next, pure water was placed in a reaction vessel equipped with a stirrer and a jacket.
Above acrylic copolymer, partially saponified polyvinyl alcohol (Kuraray Co., trade name "Kuraray Povar L-8")
3% aqueous solution (abbreviated as PVA aqueous solution), hydroxypropyl methylcellulose (Shin-Etsu Chemical Co., Ltd., trade name “Metroze 60SH50”) 3% aqueous solution (abbreviated as cellulose aqueous solution), t-butyl peroxy neodecanoate ( BPOND), α-cumylperoxy neodecanoate (abbreviated as QPOND), CaCl
₂ at the same time, then exhaust the air in the polymerization reactor with a vacuum pump, and then add vinyl chloride under stirring conditions,
By stirring for 30 minutes, vinyl chloride was uniformly mixed, and polymerization was started at a polymerization temperature of 50 ° C. by controlling the jacket temperature.

The completion of the reaction was confirmed by reducing the pressure in the reactor to a pressure of 5.8 kg / cm ² , and after the defoaming agent (manufactured by Toray Industries, Inc., “Toray Silicon SH5510”) was added under pressure, the reaction was stopped. Stopped. Thereafter, the unreacted vinyl chloride monomer was removed, followed by dehydration drying to obtain a vinyl chloride resin (A).

According to the blending and extrusion conditions shown in Tables 3 to 5, a rigid vinyl chloride resin tube of the present invention was obtained by the following procedure. <Manufacture of hard vinyl chloride resin tube> 100 parts by weight of the above vinyl chloride resin (A), an organotin stabilizer (B) (trade name "SNT-461K", manufactured by Sankyoki Gosei Co., Ltd.), polyethylene Lubricants (polyethylene wax) (manufactured by Mitsui Petrochemical Co., Ltd., trade name "Hiwax220RKT"), stearic acid (C) (Kao Corporation, trade name "S-30"), calcium stearate (D) (Sakai Chemical Co., product The name "SC-
100 ") and an acrylic processing aid (E) (manufactured by Mitsubishi Rayon Co., Ltd., trade name" METABLEN P-501A "), and this mixture is a 50 mm-diameter biaxially different direction extruder (manufactured by Nagata Seisakusho Co., Ltd.) (“SLM-50”) to obtain a rigid vinyl chloride resin tube having a diameter of 20 mm.

<Evaluation of Physical Properties of Hard Vinyl Chloride Resin Tube> The physical properties of the hard vinyl chloride resin tube obtained above were evaluated in the following (1) to (6), and the results are shown in Tables 3 to 6. It is shown together. (1) Degree of polymerization The viscosity average degree of polymerization of the vinyl chloride resin (A) was measured in accordance with JIS K6721 and the degree of polymerization was defined as the degree of polymerization. (2) Impact resistance A rigid vinyl chloride resin tube was subjected to a falling weight impact test at 0 ° C. and −10 ° C. in accordance with JIS K6742. The unit is cm. According to JIS K7110, an Izod impact test at 23 ° C. was performed on a notched test piece. The unit is kg · cm / cm ² .

(3) Exposure test 60, 120, 18 according to JIS A1415
After the exposure for 0 and 240 hours, the test piece was subjected to an Izod impact test at 23 ° C. (4) Tensile strength A tensile strength test at 23 ° C. was performed according to JIS K7113. The unit is kg / cm ² . (5) Bigat softening temperature A bigat softening temperature test was performed in accordance with JIS K7206. The unit is ° C. (6) Appearance The surface condition (gloss and smoothness) of the rigid vinyl chloride resin tube was visually evaluated.

[0052]

[Table 1]

[0053]

[Table 2]

[0054]

[Table 3]

[0055]

[Table 4]

[0056]

[Table 5]

[0057]

[Table 6]

(Examples 5 to 8, Comparative Examples 15 to 24) Table 7
And by the latex formulation and polymerization formulation shown in Table 8,
Acrylic copolymer (a) in the same operation procedure as in Example 1.
Was prepared to obtain a vinyl chloride resin (A). Then
100 parts by weight of the vinyl chloride resin (A) were added to Tables 9 to 11
The organic tin-based stabilizer (B) (trade name “SNT-461K”, manufactured by Sankyo Synthetic Co., Ltd.), polyethylene lubricant (polyethylene wax) (manufactured by Mitsui Petrochemical Co., Ltd.)
Trade name "Hiwax220RKT"), stearic acid (C) (manufactured by Kao Corporation, trade name "S-30"), calcium stearate (D) (manufactured by Sakai Chemical Co., trade name "SC-10")
0 "), an acrylic processing aid (E) (manufactured by Mitsubishi Rayon Co., Ltd., trade name" METABLEN P-501A "), and an acrylic polymer lubricant (F) (Mitsubishi Rayon Co., Ltd., trade name" METABLEN L-1000 ") )), And the mixture was supplied to a 50 mm-diameter twin-screw extruder (trade name “SLM-50” manufactured by Nagata Seisakusho Co., Ltd.) to obtain a hard vinyl chloride resin tube having a diameter of 20 mm.

With respect to the rigid vinyl chloride resin tubes obtained in Examples 5 to 8 and Comparative Examples 15 to 24,
(6) and the following (7) Physical properties of running properties were evaluated, and the results are summarized in Tables 9 to 11. (7) Running properties The appearance of the tube after continuous extrusion for 24 hours by the above extruder was visually observed and evaluated according to the following criteria. -Those having good appearance were evaluated as "O". Those with faint or streaks on the outer surface were evaluated as "x".

[0060]

[Table 7]

[0061]

[Table 8]

[0062]

[Table 9]

[0063]

[Table 10]

[0064]

[Table 11]

[0065]

The rigid vinyl chloride resin tube of the present invention has the above-mentioned structure, and has a specific polymerization degree obtained by graft-polymerizing a specific amount of vinyl chloride to a specific acrylic copolymer (a). Using a resin (A), a specific amount of a heat stabilizer (B), stearic acid (C), calcium stearate (D), and a processing aid (E) are blended with a vinyl chloride resin composition, It is obtained by melt extrusion molding into a tube, and is excellent in impact resistance, mechanical strength, and heat resistance without adding a conventional impact resistance reinforcing agent. In addition, it is excellent in impact resistance after exposure test, and also excellent in surface condition (gloss and smoothness), so it is required for building members and pipes that require durability, weather resistance, impact resistance, heat resistance and excellent appearance It is suitably used for construction equipment and housing materials.

The vinyl chloride resin composition used for producing the rigid vinyl chloride resin tube of the present invention has a wide extrusion molding temperature range, good thermal stability, good fluidity, low extrusion load, and Can be melt-extruded. This vinyl chloride resin composition is further added with a weight average molecular weight of 10,000 to 50.
By mixing 10,000 acrylic polymer lubricants (F), long-term running properties can be improved.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI (C08K 5/00 5:57 5:09) B29K 96:02 B29L 23:00 (72) Inventor Ayumu Yamane Ritto, Kurita-gun, Shiga Prefecture Machinojiri 75 Sekisui Chemical Co., Ltd.

Claims (2)

[Claims] The glass transition temperature of the homopolymer is -20.
Alkyl (meth) acrylate monomer having a temperature of less than 80 ° C.
100% by weight and the glass transition temperature of the homopolymer is -20
Acrylic obtained by copolymerizing 100 parts by weight of an acrylic mixed monomer (a-1) composed of 20 to 0% by weight of a monomer having a temperature of at least 0 ° C. and 0.1 to 10 parts by weight of a polyfunctional monomer (a-2). System copolymer (a) 3 to 10% by weight
The degree of polymerization obtained by graft copolymerizing 97 to 90% by weight of vinyl chloride (b) by suspension polymerization is 800 to
0.2 to 7 parts by weight of heat stabilizer (B), 0.1 to 5 parts by weight of stearic acid (C), and 0.1 to 5 parts by weight of calcium stearate (D) based on 100 parts by weight of 2,000 vinyl chloride resin (A). 1 to 5 parts by weight, and processing aid (E) 0.1 to
A vinyl chloride resin composition containing 10 parts by weight,
A rigid vinyl chloride resin tube obtained by melt extrusion molding into a tube. 2. The vinyl chloride resin composition according to claim 1, further comprising 0.01 to 5 parts by weight of an acrylic polymer lubricant (F) having a weight average molecular weight of 10,000 to 500,000. A rigid vinyl chloride resin tube obtained by melt-extruding a resin composition into a tubular shape.