JPH1025384A - Highly packed foamable resin composition having hydrogen chloride scavenging ability and its molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain both a highly packed foamable resin composition excellent in properties, having highly hydrogen chloride scavenging ability when being burnt, comprising a vinyl chloride-based resin in a highly packed state of calcium carbonate, which is foamable and moldable, and to provide its molding. SOLUTION: This composition is obtained by blending 100 pts.wt. of a vinyl chloride-based resin with 50-300 pts.wt. of a heavy calcium carbonate or precipitated calcium carbonate having <=1μm particle diameter as an inorganic fine particle filler, 0.05-20 pts.wt. of a blowing agent and 3-50 pts.wt. of a polymer processing auxiliary excellent in compatibility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly filled foamed resin composition having a hydrogen chloride-capturing ability and a molded article thereof, and more particularly, to a highly filled calcium carbonate filler to enable foam molding. With excellent physical properties,
The present invention relates to a highly-filled foamed resin composition of a vinyl chloride-based resin having a high hydrogen chloride-capturing ability at the time of combustion and a molded product thereof.

[0002]

2. Description of the Related Art In general, vinyl chloride resins have excellent physical and mechanical properties, and are particularly excellent in flame retardancy, and are therefore used in many fields such as building materials. . However, since vinyl chloride contains chlorine in its molecule, it is a problem that hydrogen chloride is generated at the time of a fire, which affects the environment. In addition, many plastic products after use are incinerated. However, it is also a problem that vinyl chloride resin generates hydrogen chloride when incinerated, which affects human bodies and incinerators.

As a means for suppressing the generation of hydrogen chloride during such combustion, a method has been proposed in which a large amount of an inorganic filler such as calcium carbonate is blended into a vinyl chloride resin to capture the generated hydrogen chloride. ing.

For example, Japanese Patent Publication No. 57-54054 discloses that an appropriate amount of an aliphatic plasticizer, at least 2.0 parts by weight of a metal borate, and at least 5 parts by weight of hydrated alumina are added to 100 parts by weight of a plasticized polyvinyl chloride. And a polyvinyl chloride composition comprising at least 70 parts by weight of calcium carbonate having a specific surface area of 17000 cm ² / g or more based on 100 parts by weight of the polyvinyl chloride resin. Have been described.

JP-B-57-34299 discloses 100 parts by weight of a vinyl chloride resin, 40 to 90 parts by weight of a plasticizer having a molecular weight of at least 30% by weight of 900 or more, 3 to 50 parts by weight of antimony trioxide, A flame-retardant resin composition is described, which contains 5-80 parts by weight of magnesium hydroxide and 10-80 parts by weight of calcium carbonate having a particle size of 250 μm or less as main components.

[0006]

However, in these methods, although the effect of trapping hydrogen chloride is about 95%, the formed article is very brittle, has low elongation and low impact strength, and is extremely commercially available. It was difficult. In addition, hydrogen chloride generated from the surface of the molded product is released into the atmosphere before being captured by the inorganic filler (calcium carbonate), and it is not possible to completely capture all hydrogen chloride generated from the molded product. However, there is a problem that the hydrogen chloride capturing ability is limited.

Accordingly, it is an object of the present invention to provide a vinyl chloride resin having a high filling state of calcium carbonate, which enables foam molding, has excellent physical properties, and has a high ability to trap hydrogen chloride during combustion. It is an object of the present invention to provide a highly filled foamed resin composition of a base resin and a molded article thereof.

Another object of the present invention is to provide a core comprising a foam of a vinyl chloride resin highly filled with calcium carbonate,
Consists of a polymer processing aid with good compatibility with vinyl chloride resin and a skin layer composed of calcium carbonate, which can eliminate the brittleness of foamed moldings, which was not realized by conventional technology, and An object of the present invention is to provide a vinyl chloride resin foam having extremely high hydrogen chloride scavenging ability.

Still another object of the present invention is to effectively capture hydrogen chloride generated from a vinyl chloride resin molded product at the time of combustion with a higher capture efficiency as compared with a case where a fine particle calcium carbonate filler is filled at a high level. It is an object of the present invention to provide a vinyl chloride resin foamed resin composition and a molded article comprising the same.

[0010]

According to the present invention, 50 to 300 parts by weight of a heavy to light calcium carbonate filler having a particle diameter of 1 μ or less as an inorganic fine particle filler is added to 100 parts by weight of a vinyl chloride resin, Highly filled foam having hydrogen chloride scavenging ability characterized by comprising 0.05 to 20 parts by weight of a foaming agent and 3 to 50 parts by weight of a polymer processing aid having good compatibility with vinyl chloride resin. A resin composition is provided.

According to the present invention, it is also obtained by quenching and molding the above-mentioned highly filled foam composition by Celca molding.
A highly filled foamed resin molded article having a hydrogen chloride-capturing ability, characterized in that a skin layer of a polymer processing aid and a calcium carbonate filler having good compatibility with a vinyl chloride resin is formed on the surface of the molded article. Is done.

In the present invention, baking soda (N
aHCO ₃ ) is particularly preferred.

According to the present invention, by blending a polymer processing aid having good compatibility with the vinyl chloride resin, it is possible to highly fill the vinyl chloride resin with calcium carbonate and perform foam molding. That is, the polymer processing aid used in the present invention lowers the interfacial tension of the vinyl chloride resin, and under the conditions of melt-kneading, acts to make the dispersion of calcium carbonate uniform and uniform. Foam molding in a state of high filling of calcium carbonate becomes possible. In addition, it is possible to improve the hydrogen chloride trapping property at the time of combustion by filling calcium carbonate at a high level and foaming the same.

Further, by filling calcium resin into the resin at a high level, general effects such as improvement of heat resistance, suppression of linear expansion coefficient, improvement of dimensional stability, and provision of flame retardant effect can be obtained. In addition, the effect of miniaturizing the foam cell and dispersing the calcium carbonate fine particles uniformly around the foam cell is also obtained, thereby improving the physical properties of the molded article, for example, the rigidity, and improving the above-mentioned various properties. It can be further improved.

Also, calcium carbonate,
Along with the blowing agent, a polymer processing aid having good compatibility with the vinyl chloride resin is blended, and the resin composition is applied with the Celca molding method, so that the surface of the molded product has good compatibility with the vinyl chloride resin. It is possible to form a layer composed of a composition of a polymer processing aid and calcium carbonate, and since this surface layer has a low content of a vinyl chloride resin, the effect of trapping hydrogen chloride during combustion can be increased. Can be.

That is, no hydrogen chloride is generated from the surface of the molded product, and the release of hydrogen chloride generated immediately after combustion from the inside without being captured by calcium carbonate can be suppressed by the surface layer. Becomes Further, the formation of the surface layer makes it possible to remarkably improve the physical properties, for example, the rigidity of the foam molded article.

Furthermore, by selecting baking soda as the blowing agent component of the resin composition of the present invention, it is possible to more effectively capture hydrogen chloride by a neutralization reaction of acid and base. That is, baking soda decomposes at the time of molding, as shown in the following formula (1) · 2NaHCO ₃ → Na ₂ CO ₃ + H ₂ O + CO ₂ ‥ (1), and foams. And (3) NaHCO ₃ + HC1 → NaC1 + H ₂ O + CO ₂ ‥ (2) Na ₂ CO ₃ + 2HCl → 2NaC1 + H ₂ O + CO ₂ ‥ (3)

[0018]

Embodiment

[Resin Composition] Examples of the vinyl chloride resin used in the present invention include vinyl chloride homopolymers, copolymers of monomers copolymerizable with vinyl chloride, and grafts of vinyl chloride with rubber components capable of graft copolymerization. And copolymers.
Suitable examples of the copolymer include vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer, vinyl chloride-styrene copolymer, vinyl chloride-isobutylene copolymer, Vinyl chloride-vinylidene chloride copolymer, vinyl chloride-styrene-maleic anhydride terpolymer, vinyl chloride-styrene-acrylonitrile copolymer, vinyl chloride-butadiene copolymer, vinyl chloride-vinylidene chloride-vinyl acetate Copolymer, vinyl chloride-acrylate copolymer, vinyl chloride-
Maleic acid ester copolymer, vinyl chloride-methacrylic acid ester copolymer, vinyl chloride-acrylonitrile copolymer, internally plasticized polyvinyl chloride and the like.

The target calcium carbonate filler may be either light calcium carbonate or heavy calcium carbonate. The particle shape may be irregular or regular, and whisker-like. A thing may be used. These may be used alone or in combination. The average particle size of these calcium carbonate fillers is preferably less than 1 μm (submicron),
μ or less is more preferred, and 0.2 μ or less is most preferred.
When the particle size of calcium carbonate is 1 μm or more, the ability to capture hydrogen chloride is undesirably reduced.

The addition amount of the calcium carbonate filler is preferably 50 to 300 parts by weight, more preferably 50 to 150 parts by weight, based on 100 parts by weight of the vinyl chloride resin. If the amount is less than 50 parts by weight, the desired effect of trapping hydrogen chloride cannot be obtained. Further, if it is added in excess of 300 parts by weight, no further effect can be expected, and deterioration of moldability and deterioration of physical properties such as strength are not preferred.

In the present invention, the polymer processing aid having good compatibility with the vinyl chloride resin includes a polymer processing aid having a solubility parameter (Sp value) within ± 0.6 of the Sp value of the vinyl chloride resin. Agent is used. The solubility parameter is as follows: Sp = (CED) ^1/2 = (ΔE / V) ^1/2 where CED is the cohesive energy density, ΔE is the molar cohesive energy, and V is the molecular volume. It has a dimension defined and expressed as (cal / cm ³ ) ^1/2 .
The Sp value of the vinyl chloride resin is 9.6 in theory and 9.5 in actual measurement.

Suitable polymer processing aids include, for example,
Methacrylate / butadiene / styrene (MBS) resin, acrylonitrile / butadiene / styrene (AB
S) Resin, acrylonitrile-ethylene-styrene (A
ES) resin, styrene resin such as acrylonitrile / styrene (AS) resin, acrylic resin such as polymethyl methacrylate, ethylene-vinyl acetate copolymer (EV
A) resin, polyurethane resin and the like.

The amount of these additives is preferably 3 to 50 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the amount is less than 3 parts by weight, the impact resistance is not sufficiently exhibited, and the skin layer on the surface of the molded product is insufficient, so that the capability of capturing hydrogen chloride is undesirably reduced. On the other hand, if the amount is more than 50 parts by weight, the cost increases, which is not preferable.

The foaming agent in the resin composition of the present invention is not particularly limited, and may be a physical foaming agent or a decomposable foaming agent (chemical foaming agent). As physical blowing agents, for example, pentane, neopentane, hexane,
Heptane, benzene, methylene dichloride, trichloroethylene, Freon (11) and the like can be mentioned. As the decomposition type foaming agent, either an inorganic foaming agent or an organic foaming agent can be used. For example, inorganic foaming agents include sodium bicarbonate (baking soda), ammonium carbonate, ammonium bicarbonate, ammonium nitrite, sodium borohydride, light metals, azide compounds and the like. Azodicarponamide, azopisisobutyronitrile, dinitrosopentamethylenetetramine, N, N'-
Dinitrone-N, N'-dimethylterephthalamide, p
-Toluenesulfonyl hydrazide, p, p'-oxy-pis (benzenesulfonyl hydrazide), benzenesulfonyl hydrazide, trihydrazinotriazine and the like. These foaming agents may be used alone or in combination of two or more.

Of these, sodium bicarbonate blowing agent, which is an inorganic blowing agent, is most preferable from the viewpoint of hydrogen chloride capturing ability.

The vinyl chloride resin composition of the present invention may further contain, if necessary, a plasticizer, a lubricant, a stabilizer, an ultraviolet absorber, an antistatic agent, an oxidizing agent, in addition to the calcium carbonate filler, the processing aid and the foaming agent. Inhibitors, pigments, flame retardants, and the like may be appropriately added and blended according to a known formulation.

The plasticizer may be any of those known as plasticizers for vinyl chloride resins, for example, phthalic acid esters, aliphatic dibasic acid esters, phosphoric acid esters, hydroxy polycarboxylic acid esters, monofatty acid esters, and polyhydric acid esters. Alcohol esters, epoxy plasticizers, and polyester plasticizers are used.

As the lubricant, various waxes, for example, petroleum wax, polyethylene wax, polypropylene wax, fatty acid or its derivative, animal and plant wax and the like are used.

As the stabilizer, a stabilizer known per se, for example, a tin-based stabilizer, a metallic soap-based stabilizer, a zeolite-based stabilizer, or a lead-based stabilizer can be blended. Examples of the organotin-based stabilizer include dibutyltin dilaurate, dibutyltin maleate, organotin mercaptide, di-n-octyltin laurate, di-n-octyltin maleate polymer, and di-n-octyltin bis 2-ethylhexylmale. Ethates, di-n-octyltin bisisooctylthioglycolate and the like are used. As the metal soap based stabilizer, calcium stearate, magnesium stearate, barium stearate, zinc stearate or the like is used alone or in combination of two or more. Examples of the zeolite-based stabilizer include A-type, X-type, Y-type, T-type and the like, as well as chababasite, mordenite, erionite,
Various crystal structures such as clinpatirolite and the like, and ion exchangers and calcium ion exchangers thereof are used. As the lead-based stabilizer, any known per se,
Particularly tribasic to tetrabasic lead sulfate, basic lead phosphite,
Basic lead silicate, basic lead carbonate, basic lead maleate,
Examples include basic lead phthalate, basic lead stearate, higher fatty acid lead, or a combination of two or more thereof.

[Molded Article] According to the present invention, the above-mentioned highly filled foamed resin composition is quenched by cerca molding. That is, the material fed by the screw in the extruder,
It is kneaded by screw rotation and heating and is discharged from a mold (die). At this time, the foaming agent in the kneaded material is decomposed and foams when discharged from the mold. In the case of general molding, the foamed resin is cooled and solidified by a guide (sizing die) for determining a product shape, and is taken out and cut through a take-up machine. On the other hand, in the Cerca molding method, a foam molded body is formed along the lines shown in FIGS.

That is, a die body 2 is attached to the tip of the screw 1 of the extruder, and a sizing die 5 having a cooling jacket 6, a cooling tank 7, and a large take-off machine 8 are provided in this order. ing. In the die body 3,
A pipe-shaped torpedo 4 is fixed by a spider 3, and the molten resin composition is extruded in a hollow state from a narrow gap 11 of a die nozzle in an unfoamed state, and is passed through a sizing die 5 having almost the same dimensions as a die outlet. After being rapidly cooled by the cooling jacket 6, the outer surface becomes the skin layer 9, and the resin composition other than the outer surface foams inward, spreads, and becomes the foam layer 10. FIG. 2A shows an example of molding a seat panel of a bench, and FIG. 2B shows an example of molding a structural member having a U-shaped cross section.

When the highly filled foamed resin composition of the present invention is applied with the Celca molding method, a hard skin layer is formed on the surface,
For an average expansion ratio, the surface hardness increases. Further, since the material is solidified and extruded by a sizing die, the feature that the dimensions of the molded product are very stable can be obtained.

In particular, according to the present invention, it is possible to form a skin layer composed of a composition of a polymer processing aid having high compatibility with a vinyl chloride resin and calcium carbonate on the surface of the molded article. Has the advantage that the generation of hydrogen chloride during combustion is small since the content of the vinyl chloride resin is small.

The extrusion foaming of the resin composition of the present invention varies depending on the type and composition of the vinyl chloride resin, but it is generally preferable to carry out the extrusion at a die head temperature of 160 to 190 ° C. By supplying cooling water to the water.

The highly filled foamed extruded product according to the present invention is lightweight, has excellent heat insulating properties and rigidity, and is useful as various building materials, various structural materials, heat insulating materials and the like.

[0036]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.

Example 1 An average particle diameter of 0.1 part with respect to 100 parts by weight of a vinyl chloride resin.
100 parts by weight of 15 μm calcium carbonate, 20 parts by weight of an acrylic processing aid, 2 parts by weight of a baking soda-based foaming agent, and other stabilizers were mixed in a Henschel and extruded by Celca molding to obtain a molded product. Using the obtained molded body, the amount of hydrogen chloride generated during combustion was measured in accordance with JIS K 7217. The hydrogen chloride scavenging ability (%) was calculated according to the following equation. Hydrogen chloride scavenging ability (%) = [amount of hydrogen chloride contained in vinyl chloride resin-amount of hydrogen chloride generated] / amount of hydrogen chloride contained in vinyl chloride resin × 100 The hydrogen chloride scavenging ability was 99.3%. . Table 1 shows the results of the physical property tests on the molded products.

Example 2 An average particle diameter of 0.1 part by weight based on 100 parts by weight of a vinyl chloride resin.
100 parts by weight of 15 μm calcium carbonate, 20 parts by weight of an AES-based processing aid, 2 parts by weight of a baking soda-based foaming agent, and other stabilizers were mixed in a Henschel and extruded by Celka molding to obtain a molded product. Using the obtained molded body, the amount of hydrogen chloride generated during combustion was measured in accordance with JIS K 7217. The hydrogen chloride scavenging ability was 99.4%. Table 1 shows the results of the physical property tests on the molded products.

Example 3 An average particle diameter of 0.1 parts per 80 parts by weight of the vinyl chloride resin was used.
100 parts by weight of 5 μm calcium carbonate, 20 parts by weight of an acrylic processing aid, 2 parts by weight of a baking soda-based foaming agent, and other stabilizers were mixed in a Henschel and extruded by Celca molding to obtain a molded product. Using the obtained molded body, the amount of hydrogen chloride generated during combustion was measured in accordance with JIS K 7217. The hydrogen chloride scavenging ability was 99.2%. Table 1 shows the results of the physical property tests on the molded products.

[0040]

[Table 1]

The following (Note) in Table 1 shown below is as follows. (Note 1) Vinyl chloride resin manufactured by Mitsui Toatsu Chemical (average degree of polymerization 800) (Note 2) Calcium carbonate (average particle size manufactured by Shiraishi Kogyo)
0.15μ) (Note 3) Methacryl processing aid manufactured by Mitsubishi Chemical (Note 4) Inorganic baking soda blowing agent manufactured by Kyoei Chemical (Note 5) AES processing aid manufactured by Nippon Synthetic Rubber

Comparative Example 1 An average particle of 0.1 was added to 100 parts by weight of a vinyl chloride resin.
100 parts by weight of 5 μm calcium carbonate, 20 parts by weight of an acrylic processing aid, and other stabilizers were mixed in a Henschel and extruded to obtain a molded product. (No foaming) Using the obtained molded body, the amount of hydrogen chloride generated during combustion was measured according to JIS K
It was measured according to 7217. Since it was not foaming Cerca molding, an acrylic processing aid and a calcium carbonate skin layer were not formed, so that hydrogen chloride from the surface of the molded product could not be caught and the hydrogen chloride capturing ability was 93.8%. Tables 2 and 3 show the results of the physical property tests on the molded products.

Comparative Example 2 An average particle diameter of 0.1 part by weight based on 100 parts by weight of a vinyl chloride resin.
100 parts by weight of 15 μm calcium carbonate, 20 parts by weight of an acrylic processing aid, 2 parts by weight of a baking soda-based foaming agent, and other stabilizers were mixed in a Henschel and subjected to extrusion molding by ordinary foaming to obtain a molded product. Using the obtained molded body, the amount of hydrogen chloride generated during combustion was measured in accordance with JIS K 7217. Since this molded product is usually formed by foaming, as in Comparative Example 2, an acrylic processing aid and a calcium carbonate skin layer are not formed on the surface layer. Was 96.1%. Tables 2 and 3 show the results of the physical property tests on the molded products.

Comparative Example 3 An average particle size of 0.1 part by weight based on 100 parts by weight of a vinyl chloride resin.
100 parts by weight of 15 μm calcium carbonate, 20 parts by weight of an acrylic processing aid, 2 parts by weight of an azodicarponamide foaming agent, and other stabilizers were mixed in a Henschel and extruded with Celca to obtain a molded product. Using the obtained molded body, the amount of hydrogen chloride generated during combustion was measured according to JIS K 7217. This molded article had no hydrogen chloride scavenging effect because the azodicarponamide blowing agent was used, and had a hydrogen chloride scavenging ability of 95.8%. Tables 2 and 3 show the results of the physical property tests on the molded products.

Comparative Example 4 An average particle size of 0.1 part by weight based on 100 parts by weight of a vinyl chloride resin.
100 parts by weight of 15 μm calcium carbonate, 2 parts by weight of an acrylic processing aid, 2 parts by weight of a baking soda-based foaming agent, and other stabilizers were mixed in a Henschel, and extruded with Celka to obtain a molded product. Using the obtained molded body, the amount of hydrogen chloride generated during combustion was measured in accordance with JIS K 7217.
Since this molded product contains a small amount of an acrylic processing aid, a vinyl chloride resin is precipitated on the skin layer on the surface. Therefore, the hydrogen chloride scavenging ability was 94.5%. Tables 2 and 3 show the results of the physical property tests on the molded products.

Comparative Example 5 An average particle diameter of 2 μm was added to 100 parts by weight of a vinyl chloride resin.
Was mixed with 100 parts by weight of heavy calcium carbonate, 20 parts by weight of an acrylic processing aid, 2 parts by weight of a baking soda-based foaming agent, and other stabilizers in a Henschel, and extruded with Celka to obtain a molded product. Using the obtained molded body, the amount of hydrogen chloride generated during combustion was measured in accordance with JIS K 7217. Since this molded product contained 1 μm or more of calcium carbonate, the hydrogen chloride trapping ability was rather small, at 81.6%. Tables 2 and 3 show the results of the physical property tests on the molded products.

Comparative Example 6 An average particle diameter of 0.1 part by weight with respect to 100 parts by weight of a vinyl chloride resin.
200 parts by weight of 15 μm calcium carbonate, 20 parts by weight of an acrylic processing aid, 2 parts by weight of a baking soda-based foaming agent, and other stabilizers were mixed in a Henschel, and extruded with Celka to obtain a molded product. Using the obtained molded body, the amount of hydrogen chloride generated during combustion was measured in accordance with JIS K 7217. This molded product had a hydrogen chloride scavenging ability of 98.9%, which was almost the same as the content of 100 parts by weight of calcium carbonate. However, it is very brittle in physical properties and is difficult to commercialize. Tables 2 and 3 show the results of the physical property tests on the molded products.

[0048]

[Table 2]

[0049]

[Table 3]

The following (Note) in Tables 2 and 3 shown below are as follows. (Note 6) Heavy calcium carbonate manufactured by Nitto Powder Chemical (average particle diameter 2μ) (Note 7) Organic ADCA foaming agent manufactured by Sankyo Chemical

[0051]

According to the present invention, by adding a polymer processing aid having good compatibility with a vinyl chloride resin, the beer chloride resin can be highly filled with calcium carbonate and foam molding can be performed. . In addition, it is possible to improve the hydrogen chloride trapping property at the time of combustion by filling calcium carbonate at a high level and foaming the same.

Further, by filling calcium carbonate into the resin at a high level, general effects such as improvement of heat resistance, suppression of linear expansion coefficient, improvement of dimensional stability, and provision of flame retardant effect can be obtained. In addition, the effect of miniaturizing the foam cell and dispersing the calcium carbonate fine particles uniformly around the foam cell is also obtained, thereby improving the physical properties of the molded article, for example, the rigidity, and improving the above-mentioned various properties. It can be further improved.

Further, by applying the Celka molding method to the resin composition of the present invention, a layer comprising a composition of a polymer processing aid having high compatibility with a vinyl chloride resin and calcium carbonate is formed on the surface of the molded article. Can be formed, and since this surface layer has a small content of the vinyl chloride resin, the effect of trapping hydrogen chloride during combustion can be increased.
In other words, no hydrogen chloride is generated from the surface of the molded body, and the release of hydrogen chloride generated immediately after combustion from inside without being captured by calcium carbonate can be suppressed by the surface layer. Further, the formation of the surface layer makes it possible to remarkably improve the physical properties, for example, the rigidity of the foam molded article.

Furthermore, by selecting baking soda as the blowing agent, it is possible to more effectively capture hydrogen chloride by a neutralization reaction of acid and base.

[Brief description of the drawings]

FIG. 1 is a layout view of an apparatus for explaining a self-forming process for use in the present invention.

FIG. 2 is a sectional view of a die outlet in FIG.
A of FIG. 2 shows an example of forming a seat panel of a bench, and FIG.
Is a molding example of a structural material having a U-shaped cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw of extruder 2 Die main body 3 Spider 4 Torpedo 5 Sizing die 6 Cooling jacket 7 Cooling tank 8 Large take-off machine 9 Skin layer 10 Foam layer 11 Resin outlet

Claims (4)

[Claims] [Claim 1] 100 parts by weight of a vinyl chloride resin,
50 to 300 parts by weight of a heavy to light calcium carbonate filler having a particle size of 1 μ or less as an inorganic fine particle filler, 0.05 to 20 parts by weight of a foaming agent, and a polymer processing aid having good compatibility with a vinyl chloride resin. A highly-filled foamed resin composition having a hydrogen chloride-capturing ability, comprising 3 to 50 parts by weight of 2. The resin composition according to claim 1, wherein the blowing agent is baking soda. 3. The resin composition according to claim 1, wherein the polymer processing aid having good compatibility with the vinyl chloride resin is an acrylic resin and an AES resin. 4. A process aid obtained by subjecting the highly filled foamed composition according to claim 1 to rapid cooling molding by Celka molding, and having a surface compatible with a vinyl chloride resin and a processing aid having good compatibility with a calcium carbonate filler. A highly filled foamed resin molded article having a hydrogen chloride trapping ability, wherein a skin layer is formed.