JPS60192745A - Molded article of vinyl chloride resin and molding method - Google Patents

Abstract

PURPOSE:To obtain the titled molded article having a low coefficient of linear expansion, and excellent impact resistance and moldability, by pelletizing a mixture of a vinyl chloride resin, wood flour, gypsum fibers, CaCO3, and specified modifiers, followed by extrusion thereof. CONSTITUTION:100pts.wt. vinyl chloride resin, 5-50pts.wt. wood flour with diameters of 40-200mum, dried at a temperature of 100 deg.C or higher for 30min or longer, 5-30pts.wt. gypsum fibers with diameters of 100-200mum, 10-50pts.wt. CaCO3, 5-20pts.wt. of at least one modifier selected from among chlorinated PE, an ethylene-vinyl acetate copolymer, an acrylonitrile (or methyl methacrylate)-butadiene-styrene copolymer, are mixed, and the mixture is kneaded in a kneader and pelletized. The pellets are mixed at a temperature of 100 deg.C or higher for 30min or longer in a hopper drier, and extruded with a vent-type extruder at a resin temperature of 175 deg.C or lower.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to molded products having a small coefficient of linear expansion and excellent physical properties and appearance, particularly for use in rain gutters, decking materials, window frames, and other buildings. The present invention relates to a vinyl chloride resin molded product suitable for thin-walled molded products having a wood-like appearance, and a method for molding the same.

(Prior art) In recent years, molded products made of vinyl chloride resin, such as rain gutters made of hard vinyl chloride, have been increasingly used.
Rigid PVC rain gutters have a higher coefficient of linear expansion than metal rain gutters, and during use, changes in temperature may cause changes in longitudinal length, causing deformation or breakage at connections or fasteners. In addition, the parts exposed directly to the sun's rays thermally expanded, causing them to bend and become wavy.

Conventionally, for example, as described in JP-A-56-34741, (A) 95 to 70% by weight of vinyl chloride resin, (B) 5 to 30% by weight of gypsum fiber, (A) +(
B) has been proposed in which a copolymer resin containing 1% by weight or more of methyl methacrylate as a main component is blended, but the adhesion between the mixed gypsum fiber and the vinyl chloride resin is poor and the durability of the molded product is poor. It had the disadvantage of poor physical properties such as impact resistance.

Furthermore, as described in Japanese Patent Application Laid-Open No. 51-67379S3, a thermoplastic resin containing wood) has been proposed in which a small amount of defoaming substance is added. Since it is not possible to suppress the occurrence of slippage, voids are created around the wood flour, and the adhesion between the wood flour and thermoplastic resin is extremely poor (the physical properties such as impact resistance of the molded product are extremely low, and the molding The surface condition of the molded product is not 111 smooth.
Not only does it look bad, but this also causes the Il! to be used outdoors. J had the disadvantage of whitening (chalking) within a short period of time (if).

(Invention 1) In view of the above facts, the idea of the present invention is based on the results of a 5g test using a sharp 5g test. The present invention was developed based on the discovery of a way to eliminate the conventional drawbacks as mentioned above. PVC resin molding with excellent moldability, good surface condition, and wood-like appearance, especially suitable for thin-walled molded products such as rain gutters, decking materials, window frames, and other building materials. The purpose is to provide products.

(Summary of the Invention) The summary of the present invention is as follows: 1. In 100 parts by weight of vinyl chloride resin, 5 to 30 heavy seams of gypsum fiber and 5 to 50 parts of wood
parts by weight, 10 to 50 parts by weight of calcium carbonate, and selected from among chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and methyl methacrylate-butadiene-styrene copolymer. a vinyl chloride resin molded product (hereinafter referred to as "one-produced molded product 1"), in which 5 to 20 parts by weight of at least one modifier is dispersed; 2. Vinyl chloride resin 10
0 parts by weight, 5 to 30 parts by weight of gypsum fiber and 5 parts by weight of wood powder.
50 parts by weight of a defoaming agent, 0.3 to 2 parts by weight of a defoaming agent, 91 to 50 parts by weight of calcium carbonate (and chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer). and 5 to 20 parts by weight of at least one modifier selected from methyl methacrylate-butadiene-styrene copolymer (hereinafter referred to as "molded product 2 of the present invention"). ), 3.At least 3 at 100℃ or higher
5 to 50 parts by weight of wood flour dried for 0 minutes or more, 100 parts by weight of vinyl chloride resin, 5 to 30 parts by weight of gypsum fiber, 10 to 50 parts by weight of calcium carbonate, chlorinated polyethylene, ethylene-vinyl acetate. copolymer, acrylonitrile-butadiene-styrene copolymer, and methyl methacrylate-butadiene-styrene copolymer with 5 to 20 parts by weight of at least one modifier, and the mixture is kneaded. After kneading in a machine, the crushed pieces or pellets are mixed in a hopper dryer at 100°C or higher for 30 minutes or more, and then in a Hentquibb extruder at a resin temperature of 175°C or lower. A method for molding a vinyl chloride resin molded product characterized by extrusion molding (hereinafter referred to as "molding method 1 of the present invention"), 4. 5 to 50 parts by weight of wood flour dried at 100 ° C. or higher for at least 30 minutes or more. , vinyl chloride resin 100
parts by weight, 5 to 30 parts by weight of gypsum fiber, and 0.0 parts by weight of a defoaming agent.
3 to 2 parts by weight, 10 to 50 parts by weight of calcium carbonate, chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and methyl methacrylate-butadiene-styrene copolymer. At least one modifier 5 selected from
20 parts by weight, and this mixture was put into a kneader.
(After kneading, the crushed pieces or pellets are mixed in a hopper dryer at 100°C or higher for 30 minutes or more, and then extruded using a Ghent type extruder at a resin temperature of 175°C or lower. A method for molding a vinyl chloride resin molded article (hereinafter referred to as "molding method 2 of the present invention") is provided.

(Structure of the invention) Molded article 1.2 of the present invention and molding method 1 of the present invention.

As the vinyl chloride resin used in No. 2, for example, polyvinyl chloride (PVC), polyvinylidene chloride, chlorinated polyvinyl chloride (chlorinated PVC), etc. are preferably used. > is particularly preferably used.

Molded products 1 and 2 of the present invention and molding method 1 of the present invention.

For example, the gypsum fiber used in I flea 1
00 to 200 μm are preferably used, and those whose surfaces have been surface-treated with a camping treatment agent such as epoxy silane are preferably used.

The wood used in the molded article 1.2 of the present invention and the molding method 1.2 of the present invention is, for example, (40 to 200μ
Those having a moisture content of 2% or less are preferably used.

Molded product of the present invention 1. As the calcium carbonate used in 2 and the molding method of the present invention 1.2, for example, precipitated calcium carbonate, slight rhusium carbonate, ultrafine calcium carbonate, etc. are preferably used, and especially ultrafine calcium carbonate is particularly preferred. Those whose surfaces have been surface-treated with a fatty acid ester or the like are preferably used.

Molded product of the present invention 1. 2 and the present invention molding method 1゜2, the modifier used is added to the system to
It improves the adhesion between gypsum fibers and wood powder and resin, reduces the voids that occur around short glass fibers and wood powder, and improves physical properties such as impact strength of molded products. Polyethylene (chlorinated PE), ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer (ABS) and methyl methacrylate-butadiene-styrene copolymer (MBS) One type is used.

As the defoaming agent used in the molded article 2 of the present invention and the molding method 2 of the present invention, for example, a silicone-based defoaming agent is preferably used.

Molded articles 1 and 2 of the present invention and molding method 1 of the present invention.

In No. 2, in addition to the above, stabilizers and pigments may be used in combination as necessary.

In the molded product 1.2 of the present invention and the molding method 1.2 of the present invention, 5 to 30 parts by weight of gypsum fiber is added to 100 parts by weight of the vinyl chloride resin together with other ingredients to improve moldability. and resistance (! without worsening the attack resistance,
Reduce the coefficient of linear expansion of molded products to make them less susceptible to thermal deformation due to temperature changes.

If gypsum fiber is not added at all or if the amount added is less than 5 parts by weight per 100 parts of vinyl chloride resin, sufficient effects cannot be expected. If it is added in a large amount exceeding 30 parts by weight, the moldability will be poor, the appearance of the molded product will not be smooth, and the impact resistance will be poor.

Molded product of the present invention 1. 2 and the molding method of the present invention 1゜2, ζ is determined by adding 5 to 50 parts by weight of wood 1'5) to vinyl chloride resin at 100°C or higher together with other ingredients to improve moldability and durability. No impact damage or damage,
It reduces the coefficient of linear expansion of the molded product and prevents it from being thermally deformed due to temperature changes.
If a small amount, less than 5 parts by weight, is added to 00 parts by weight, sufficient effects cannot be expected, and if added in a large amount, exceeding 50 parts by weight, moldability will deteriorate and the moldability will deteriorate. The appearance of the product will not be smooth and the impact resistance will deteriorate.

In molded product 1.2 of the present invention and molding method 1.2 of the present invention, 10 to 50 parts by weight of calcium carbonate is added to 100 parts by weight of vinyl chloride resin together with other ingredients to improve weather resistance and At least the amount of gypsum fiber added improves the rigidity of the molded product and makes it less susceptible to thermal deformation due to temperature changes without deteriorating impact resistance. If calcium carbonate is not added at all or if only a small amount of less than 10 parts by weight is added to 100 parts by weight of vinyl chloride resin, a sufficient effect cannot be expected;
If a large amount exceeding the weight part is added, impact resistance and weather resistance will deteriorate.

In the molded products 1 and 2 of the present invention and the molding method 1-2 of the present invention, the modifier is added to the liner by adding 5 to 20 parts by weight to 100 parts by weight of the vinyl chloride thread resin together with other components. To improve physical properties such as impact resistance and rigidity of molded products without increasing expansion coefficient. If no modifier is added or only a small amount of less than 5 parts by weight is added,
If a sufficient amount of rhinoceros is not expected, and if a large amount exceeding 20 parts by weight is added, the coefficient of linear expansion will increase.

In the molded article 2 of the present invention and the molding method 2 of the present invention, the defoaming agent is added at 0.0 parts by weight per 100 parts by weight of the vinyl chloride resin.
By adding 3 to 2 parts by weight, air bubbles generated each time wood flour is added are suppressed as much as possible. If no defoamer is added at all or only a small amount of less than 0.03 parts by weight is added, a sufficient effect cannot be expected;
If it is added in a large amount exceeding 1 part by weight, not only the moldability will deteriorate, but also the kneading properties of the resin will deteriorate, resulting in poor physical properties such as impact resistance of the molded product.

Molding method of the present invention 1. In step 2, 5 to 50 parts by weight of wood flour dried at 100° C. or higher for at least 30 minutes or more, preferably 1 hour or more, 100 parts by weight of vinyl chloride resin, and 5 to 50 parts by weight of gypsum fiber, etc. Mix with a mixer.

Preferably, the mixing is carried out under heat and at high speed. While kneading this mixture using a roll kneader, the shearing force of the mixture causes the gypsum fibers to be separated and uniformly dispersed in the resin. The mixing conditions for the roll kneader include a roll temperature of 150~
175°C, CJ-le spacing 1-2, kneading time 3-8
Minutes are preferred.

A sheet-like material is extruded from a roll kneader and this sheet-like material is pulverized. The crushed pieces are mixed in a popper dryer at 100° C. or higher for 30 minutes or more, and then extruded from a bend type extruder at a resin temperature of 175° C. or lower to form a molded product.

As for the extrusion conditions, it is preferable to select an extruder model so as to apply as much shearing force as possible, and to use a breaker with a small hole diameter so that the resin pressure is high, and the resin pressure range is 130~ Preferably, the resin temperature is 170 kglctl, the resin temperature is 170 to 175°C, and the mold temperature is 180°C or less.

As the kneading machine, in addition to the roll kneading machine described above, an extruder with a large kneading force for producing pellets or the like may be used.

(Margin below) (Effects of the present invention) The molded article 1 of the present invention contains 5 to 30 parts by weight of gypsum fiber, 5 to 50 parts by weight of wood flour, and 10 to 50 parts by weight of calcium carbonate in 100 parts by weight of vinyl chloride resin. parts by weight, and at least one modifier selected from chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and methyl methacrylate-butadiene-styrene copolymer 5 Since the molded product has a small linear expansion coefficient and high rigidity, thermal deformation due to temperature changes may occur, and physical properties such as tensile strength and impact resistance are low. It has excellent moldability, and the surface condition of the molded product is good (it has a wood-like appearance).

The molded article 2 of the present invention contains 5 to 30 parts by weight of gypsum fiber, 5 to 50 parts by weight of wood flour, 0.3 to 2 parts by weight of defoaming agent, and calcium carbonate in 100 parts by weight of vinyl chloride resin. 10 to 50 parts by weight, and at least one species selected from chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-zotadi-1-styrene copolymer, and methylmekacrylate-butadiene-styrene copolymer. Since the modifier is dispersed in 5 to 20 parts by weight, the molded product has a small coefficient of linear expansion, is resistant to thermal deformation due to temperature changes, and has high tensile strength and fJi resistance.
It has excellent physical properties such as impact resistance, good moldability, and a good surface condition of the molded product, giving it a wood-like appearance.

The molding method 1 of the present invention has a temperature of at least 30°C at 100°C or above.
5 to 50 parts by weight of wood flour dried for at least 10 minutes, 100 parts by weight of vinyl chloride resin, 5 to 30 parts by weight of gypsum fiber, 50 parts by weight of calcium carbonate IO, chlorinated polyethylene, ethylene-vinyl acetate, etc. polymer, and 5 to 20 parts by weight of at least one modifier selected from acrylonitrile-butadiene-styrene copolymer and methyl methacrylate-phthadiene-styrene copolymer, and the mixture is passed through a kneader. After kneading, the crushed pieces or pellets are mixed in a hopper trier at 100°C or higher for 30 minutes or more, and then mixed in a Hentrive extruder at a resin temperature of 175°C or lower. Since it is extruded, the moisture content of the wood flour is kept within 2% and dispersed in the resin during molding.
The generation of gas is kept to an extremely low level, the voids generated around the wood powder are kept very small, the adhesion between the wood powder and the resin is good, and the coefficient of linear expansion of the molded product is small, preventing thermal deformation due to temperature changes. In addition, it has excellent physical properties such as tensile strength and impact resistance, has good moldability, has a good surface condition, and has a woody appearance.

In the molding method 2 of the present invention, at least 30
5 to 50 parts by weight of wood flour dried for more than 10 minutes, 100 parts by weight of vinyl chloride resin, 5 to 30 parts by weight of gypsum fiber, 0.3 to 2 parts by weight of defoaming agent, and 10 to 50 M of calcium carbonate. and at least one modifier selected from chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and methyl methacrylate-butadiene-styrene copolymer. After kneading this mixture with 20 parts by weight, the mixture is kneaded with a kneader and then made into pulverized pieces or pelletized, and the pulverized pieces or pellets are mixed with
After mixing at a temperature of 30 minutes or more at a temperature of 100°C or more, extrusion molding is performed using a Gent-type extruder at a resin temperature of 175°C or less, so the moisture content of the wood flour is kept within 2% during molding. It is dispersed in the resin, suppressing the generation of gas to an extremely low level, suppressing the voids that occur around the wood powder to an extremely small level, ensuring good adhesion between the wood powder and the resin, and reducing the coefficient of linear expansion of the molded product. It is small and does not easily undergo thermal deformation due to temperature changes, and has excellent physical properties such as tensile strength and impact resistance (h), as well as good moldability and a good surface condition of the molded product.
It has a woody appearance. (The following is a blank space.) The present invention will be described below with reference to Examples.

(Examples 1, 2, 5.6) The wood flour in the formulation of Examples 1, 2, 5.6 shown in Table 1 was
After drying at 100°C for 1 hour, the mixture was well mixed with vinyl chloride resin, gypsum fiber and other ingredients, and this mixture was kneaded for 5 minutes at 160°C using a roll kneader to give a thickness of 1.2 cm.
Make a sheet-like material of 3 mm in size, crush this sheet-like material, and
After making 1-square crushed pieces, mixing these crushed pieces in a hopper dryer at 100℃ for 1 hour, extrusion with a Ghent type extruder and mold at a resin temperature of 170 to 175℃ζ
, a thin profile shaped article with a thickness of 1.21 mm was extruded. A test piece was cut out from the molded product, and the coefficient of linear expansion, tensile strength,
The elongation and impact strength were measured, and the adhesion between the resin and the gypsum fibers and wood powder in the molded product was observed. The result is
It is shown in Table 1 as Example 1°2.5.6.

(Example 3.4) The wood in the formulation of Example 3.4 shown in Table 1 was added to 100%
After drying at ℃ for 1 hour, the mixture was well mixed with vinyl chloride resin, gypsum fiber, and other ingredients, and the mixture was pelletized using an extruder for pellet production. After mixing at 100° C. for 1 hour, the mixture was extruded using a Ghent type extruder and mold at a resin temperature of 170 to 175° C. to extrusion mold a thin irregular shaped product with a thickness of 1.21 m. A test piece was cut out from the molded product and its ζ, linear expansion coefficient, tensile strength, elongation and impact strength were measured.
We also observed the adhesion between the resin and the gypsum fibers and wood powder in the molded product. The results are shown in Table 1 as Example 3.4.

(Comparative Examples 1 to 3) The formulations of Comparative Examples 1 to 3 in Table 2 were mixed well in a mixer, and the mixture was heated to a resin temperature of 180 to 1 in an extruder and mold.
Extrusion was carried out at 85° C. to extrusion mold a thin irregularly shaped article with a thickness of 1.2 mm. Test pieces were cut out from the molded products, and the linear expansion coefficient, tensile strength, elongation, and impact strength were measured. The results are shown in Table 2 as Comparative Examples 1 to 3.

Incidentally, the coefficient of linear expansion was measured using ASTM: D696. The best in tensile strength and elongation, JISA570
Measured at 6. Regarding impact strength, JISA540
Measured at 0. The adhesion between the resin and the gypsum fibers and wood powder in the molded product was determined by observing the cross section of the test piece under an electron microscope and observing the state of voids around the gypsum fibers and wood powder. .

As is clear from Table 1, in Examples 1 to 3, the coefficient of linear expansion is small, and the surface has physical properties such as iV impact resistance, and Comparative Example 2, in which gypsum fiber and wood powder are dispersed, The moldability was improved compared to the value of No. 3, and it was possible to mold a thin molded product with a thickness of 1.2 mm, and the surface condition of the molded product was good. In addition, in the case of Examples 3 to 6, the coefficient of linear expansion is small, and the physical properties such as impact resistance are further improved, and the moldability is such that thin-walled molded products of 1.2 M can be formed. The surface condition of the molded product was good.

As is clear from Table 2, Comparative Example 1 has a significantly large coefficient of linear expansion and is easily deformed due to temperature changes. Moreover, in the case of Comparative Examples 2 and 3, the moldability was poor, making it impossible to mold a thin-walled molded product, and the physical properties such as impact resistance were so poor that they could not be used for practical use. . Also, comparative example 2
In the case of 3°, the gypsum fibers or wood powder and resin did not adhere well. (Margins below) Table 1 ○: The molded product could be molded into the shape of a thin-walled irregularly shaped product, and the surface condition of the molded product was good.

Table 2 It's uniform.

Ta.

,Ta.

Continuing from page 1 ■ Int, C1, 4 identification symbol Office serial number procedure manual (self-prompted) December 12, 1980 Mr. Commissioner of the Japan Patent Office 1, Indication of the case 1988 Patent Application No. 48451 2 , Title of the invention Vinyl chloride resin molded product and its molding method 3, Relationship with the case of the person making the amendment Patent applicant Zip code 530 Address Patent Department 2-4-4 Nishitenma, Kita-ku, Osaka City
(06) 365-2181 Patent Department Tokyo based (03
) 434-9552 Subject of amendment + 11 Feature MF of EJl specification Claims column (21 Detailed explanation of the invention column 5 of specification to correct.

(2) Page 6 lines 11 to 12 of the specification, page 7 lines 1 to 2, page 7 lines 11 to 12, page 8 line 8,
Page 10, line 1θ to line 11, page 16, line 7 to line 8, page 17, line 2, page 17, line 5 from the bottom to line 4 from the bottom.
and in the first line from the bottom of page 18, the text [methyl methacrylate] has been amended to read "methyl methacrylate."

One or more documents stating the scope of patent claims after the amendment to the catalog of attached documents At least 1 document stating the scope of claims after amending the list of attached documents. and 10 to 50 parts by weight of calcium carbonate, and at least one modifier selected from chlorinated polyethylene, ethylene-vinyl acetate copolymer, and acrylonitrile-gutadiene-styrene-styrene copolymer. A vinyl chloride-based resin molded product in which 20 parts by weight of 20 parts by weight are dispersed.

In 100 parts by weight of vinyl dichloride resin, 5 to 30 parts by weight of gypsum fiber, 5 to 50 parts by weight of wood powder, and defoaming agent Q3.
2 parts by weight, 10 to 50 parts by weight of calcium carbonate, and at least one modification selected from chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and methane copolymer. A vinyl chloride resin molded article in which 5 to 20 parts by weight of a quality agent are dispersed.

3. 5 to 50 parts by weight of wood flour dried at 100°C or higher for at least 30 minutes, 100 parts by weight of vinyl chloride resin, 5 to 30 parts by weight of gypsum fiber, and 1 part by weight of carbonic acid lucicum.
o% to 50 parts by weight, chlorinated polyethylene, ethylene-
Vinyl acetate copolymer, acrylonitrile-butadiene-
The mixture is mixed with 5 to 20 parts by weight of at least one modifier selected from a styrene copolymer and a methylnuc-8 acrylate-butadiene-styrene copolymer, and the mixture is kneaded in a kneader to form pulverized pieces. Watermelon is made into pellets, and the crushed pieces or pellets are dried in a hopper dryer.
A method for molding a vinyl chloride resin molded product, which comprises mixing at a temperature of 00°C or higher for 30 minutes or more, and then extruding the mixture in a vent-type extruder at a resin temperature of 175°C or lower.

5 to 50 parts by weight of wood flour dried at 4100°C or higher for at least 30 minutes with 100 parts by weight of vinyl chloride resin,
5 to 30 parts by weight of gypsum fiber, defoaming agent (3 to 2 parts by weight of L, 10 to 50 parts by weight of calcium carbonate, chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer) and at least one modifier selected from methylmethane 5 to 2
0 parts by weight, and this mixture is kneaded in a kneader to form pulverized pieces or pelletized, and the pulverized pieces or pellets are mixed in a dryer at 100°C or higher for 30 minutes or more. A method for molding a vinyl chloride resin molded product, characterized by extrusion molding using a vent-type extruder at a temperature of 175° C. or lower.

Claims (1)

[Claims] 1. In 100 parts by weight of vinyl chloride resin, 5 parts by weight of gypsum fiber
30M parts to 30M parts, 5 to 50 parts by weight of wood flour, 10 to 50 parts by weight of calcium carbonate, chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and methyl methacrylate. A vinyl chloride resin molded article comprising 5 to 20 parts by weight of at least one modifier selected from butadiene-styrene copolymers dispersed therein. 2. 5 parts of gypsum fiber in 100 parts by weight of vinyl chloride resin
30 parts by weight, 5 to 50 parts by weight of wood flour, and 0 defoaming agent.
．． 3 to 2 parts by weight, 10 to 50 parts by weight of calcium carbonate, chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and methyl methacrylate-butadiene-styrene copolymer. At least one modifier selected from 5
A vinyl chloride-based resin molded product in which 20 parts by weight of 20 parts by weight are dispersed. 3. 5 to 50 parts by weight of wood flour dried at 100°C or higher for at least 30 minutes, 100 parts by weight of vinyl chloride resin, 5 to 30 parts by weight of gypsum fiber, and 100 parts by weight of calcium carbonate.
O to 50 parts by weight, chlorinated polyethylene, ethylene-
Vinyl acetate copolymer, acrylonitrile-butadiene-
The mixture is mixed with 5 to 20 parts by weight of at least one modifier selected from a styrene copolymer and a methyl methacrylate-butadiene-styrene copolymer, and the mixture is kneaded in a kneader to form pulverized pieces. Watermelon is made into pellets, and the crushed pieces or pellets are dried in a hopper dryer.
A method for molding a vinyl chloride resin molded product, which comprises mixing at 00°C or higher for 30 minutes or more, and then extrusion molding using a Ghent type extruder at a resin temperature of 175°C or lower. 4. 5 to 50 parts by weight of wood dried at 100°C or higher for at least 30 minutes, 100 parts by weight of vinyl chloride resin, 5 to 30 parts by weight of gypsum fiber, and 0.3 parts by weight of a defoaming agent.
2 parts by weight, 10 to 50 parts by weight of calcium carbonate, chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and methyl methacrylate-butadiene-styrene copolymer. After kneading this mixture with 5 to 20 parts by weight of at least one modifier selected from After mixing for 30 minutes or more at 100°C or higher,
A method for molding a vinyl chloride resin molded product, which is characterized by IJJ molding at a resin temperature of 175°C or less.