JPS5949243A - Chlorinated vinylchloride-based resin expansion molded product and manufacture of the same - Google Patents

Abstract

PURPOSE:To obtain titled product of great expansion ratio with fine uniform cell structure and high closed-cell content, also having high heat-resistant temperature, by blending a chlorinated vinyl chloride-based resin with an acrylic and/or styrene resin(s) followed by expansion molding. CONSTITUTION:A resin composition comprising (A) 100pts.wt. of a chlorinated vinyl chloride-based resin and (B) 0.5-30pts.wt. of an acrylic and/or styrene resin(s) is incorporated with (C) >=0.01pts.wt. of a heat-decomposable foaming agent and/or high-melting point pulverized substance followed by feeding to an extruder to carry out a kneading under molten state while injecting a valatile organic foaming agent of a boiling point <=90 deg.C and then subjecting to expansion molding to obtain the objective product. This product will have the following characteristics : (1) density: 0.1g/ml or less (2) closed-cell content : >=70% (3) heat-resistant temperature : >=75 deg.C. The chlorine content of the component (A) is pref. 60-75wt%.

Description

[Detailed description of the invention]

The present invention relates to a resin foam molded product formed by foam molding a resin composition mainly composed of chlorinated vinyl chloride resin, and a method for producing the same. The purpose of the present invention is to provide a resin foam molded product having a high expansion ratio and having a structure. Conventionally, vinyl chloride resin foam moldings have been produced by heating and foaming (1) a composition prepared by adding and mixing a vinyl chloride polymer with a so-called decomposed foaming agent that becomes a gas when decomposed, and (2) polyvinyl chloride. A paste (plastisol) made by mixing a polymer and a plasticizer is mechanically foamed and molded, or a composition prepared by adding a decomposable foaming agent to the plastisol is heated and foam-molded. It has been known. Examples of manufacturing methods include (3) heating and foaming a composition prepared by adding and mixing a decomposable blowing agent to a vinyl chloride polymer using extrusion molding or injection molding, or (4) decomposing the composition. A method of forming a foamed product by pre-roll-forming at a temperature below the decomposition temperature of the mold blowing agent and then heating, and (5) a composition thereof (
A known method is to fill a mold with a volatile organic blowing agent, a swelling organic solvent, and a softener (if necessary), and then pressurize and heat the entire mold to foam the mold. However, such conventional chloride vinyl resin foam moldings are inferior in the fine uniformity of the cell structure of the foam, and therefore have a high defoaming ratio and t.

[In addition to the disadvantage of being ugly, it also has the disadvantage of being inferior to heat-resistant bones. For example, when placed in an atmosphere with a temperature of around 60°C, the foamed molded product will change dimensions and easily shift due to its lack of heat resistance. However, the inventors of the present invention have previously applied nucleating agents such as talc to a 1'vinyl salt polymer along with a heat stabilizer. A resin composition containing decomposable foaming agents such as acrylic resin, azocica-bonamide compound, etc. is fed to an extruder L7, and the resin composition heated and gelled in this extruder has a boiling point of 90'.
A method of extrusion foaming by press-injecting a solid solvent-based blowing agent of C or lower, such as propane, butane, pentane, methyl chloride, trichlorofluoromethane, dichlorotetrafluoroethane, etc., was devised (Japanese Patent Laid-Open No. 149328/1983). (See Rabbit). The foam obtained by this method is excellent in the fine uniformity of the cell structure and the high expansion ratio.
4) The disadvantage of poor heat resistance is the same as above 1), and d◇ in this point
Ryo was very hopeful. As a result of the inventors' intensive efforts to address these car technical issues, we developed a chlorinated reinforced vinyl resin and an acrylic resin.
'#! and/or a styrene-based resin as a main component.
Accompanying salts are vinyl-based (compared to fat foam moldings). 1 heat: Width is jF:l <, and cell wall structure, i.e., cell 141-, is excellent in fineness, has a small density, and has a low foaming ratio. It is very sensitive and has an extremely high closed cell ratio 2)
After confirming this, the present invention was completed. The present invention also provides a method for producing a foamed molded product, which takes one year to prepare, by adding 100 ffl of chlorinated salt (vinyl resin [1>J, hereinafter referred to as component (a)) to heat Degradable foaming agent and/or high melting point fine powder substance [hereinafter referred to as component (B)] 16 parts in t3.0.1 Upper chest, viscous, acrylic stick F fat and/or styrene resin [hereinafter referred to as component (B) This is called C) "component" 05.~30
Parts by weight, 1 fat composition made by blending into an extruder (Jl
: A volatile organic blowing agent having a boiling point of 90° C. or lower is melted and kneaded with 11 persons, and then extrusion foam molding is completed. The present invention will be explained in detail below. The component (a) used in the present invention is a chlorinated salt (vinyl resin), and by kneading it, a foamed molded product with excellent heat resistance can be obtained. Chlorine [Various vinyl chloride resins containing 4P chlorine are used as vinyl chloride resins. As the vinyl chloride resin to be chlorinated, in addition to polyvinyl chloride, Asahi Mai [111J car polymer and graft copolymers mainly composed of vinyl] can also be used. - vinyl acetate, vinylidene chloride, acrylic acid and its esters,
Methacrylic acid and its esters, acrylonitrile,
Examples include methacrylonitrile, maleic acid and its esters or anhydrides, fumaric acid and its esters, olefins such as ethylene and propylene, and vinyl ethers, and these may be used alone or in combination. The method for chlorination may be any conventionally known method such as photochlorination under ultraviolet irradiation or solution chlorination in the presence of a chlorine compound (chlorine chlorination agent). This salt-accumulated vinyl chloride resin/resin has a chlorine content of 60 to 75
% by weight is preferred for the purposes of the present invention. If the chlorine content is low, the effect of improving heat resistance will be small;
On the other hand, if the temperature is too high, the molding temperature due to pressing or the like will become high, making processing difficult, and problems with thermal stability will occur due to the high temperature. Second, the above-mentioned components, namely the pyrolytic G7 blowing agent and the high melting point fine powder substance, act to adjust the cell structure formed during foam molding to be uniform and fine (cell homogenization aid). Among these, the thermally decomposable blowing agent is preferably one that decomposes to generate gas at a temperature lower than the molding temperature of the ibipinyl chloride resin. Examples of such decomposable blowing agents include azo-based 7Y) J agents such as azodicarbonamide, azobisisobutyronitrile, diazoaminobenzene, diethyl azodicarboxylate, diisopropylazodicarboxylate, and diazoaminobenzene. , N, N'-t, /nitrosopentamethylenetetramine, N, N'-dimethyl-N
, nitroso-based blowing agents such as N'-dinitrosoterephthalamide, benzenesulfonyl hydrazide, toluenesulfonylhydrazide, 3,3'-disulfonehydrazide phenylsulfone, toluene disulfonylhydrazone, thiobis(benzenesulfonylhydrazide), toluenesulfonyl azide, toluenesulfonyl semicarbazide,
4.4'-oxybis(benzenesulfonyl)
Examples include sulfonyl hydrazide blowing agents such as (d) or bicarbonate (d). In addition, decomposition aids such as citric acid, citric acid, tartaric acid, urea, zinc compounds, and copper compounds are added to the above thermally decomposable foaming agent (J
It is preferable to adjust the decomposition temperature by using a polyvinyl chloride polymer so that the vinyl chloride polymer decomposes under the molding moisture level Pi and generates gas. In addition, the fine powder with a high melting point may be anything that has a melting point higher than the melting point (gel point) of chlorinated vinyl chloride, 1 fat, and examples include calcium carbonate, talc, mica, sericite, etc. , barium sulfate, silica, smoke silica,
Examples include acid titanium, clay, aluminum oxide, bentonite, diatomaceous earth, carbon black or even pigments, high melting point heat stabilizers and pyrotechnics. Is there only one type of bubble homogenization aid listed above? It is not limited to use, and there is no problem in using two or more of them. Note that the component (b) has a particle size of 30 μm or less after being combined and dispersed in the molten resin composition, preferably 10 μm under PJ. It is preferable that it is a fine powder, and the amount used is according to (a) above.
001 parts by weight or more, especially 00 parts by weight, per 100 parts by weight of the component.
It is desirable to use 5 parts by weight of VJ. The particle size is 30
If μn is greater than 1, the fluidity of the resin composition during molding will be poor, the surface gloss will be reduced, a foam pattern will be produced, and the foamed cells will be J='-1-. Further, if the amount used is less than 001, it is difficult to obtain a foam molded product having a fine cell or J-1 cell structure. Even if pyrolytic foaming agent 115 units or more is used, no significant improvement in the above-mentioned effects is observed, so the amount of this component to be used should be (a) less than 100 parts of component 100 parts or 5 parts of ichikawa parts. is desirable, and even if the high melting point fine powder substance is used in an amount of 20 parts by weight or more, no significant improvement in the effects such as uniformity and fineness of cells is observed. However, the charging Jbi agent,
There is no problem in using it further for the purpose of flame retardancy, compounding, etc. In the present invention, the above (8) component, that is, acrylic yarn a
It is desirable to mix and use lIlii and styrene resin together with the above components (a) and (b), as this will promote the gelation of component (a) or
AI adjustment increases the melt viscosity of the resin or adjusts it to an appropriate viscosity, and prevents coalescence of pores and shrinkage of cells generated at high temperatures, so decomposition gas at the time of core generation is absorbed into the resin. (Hold it quickly and prevent it from escaping to the outside.)
First, the desired high-foaming material can be obtained. This (ha)
Particularly, the use of the above-mentioned components and A'1 shows a remarkable effect, and as a result, a highly foamed molded product with an excellent appearance, a uniform fine cell structure, and no shrinkage can be obtained. . In order to achieve the above effect, the acrylic resin as the component (c) should promote the gelation of the component (a) to y'1-, appropriately increase the resin viscosity, impart rubber elasticity, and chlorinate. Things that can improve the tensile strength or elongation rate at high temperatures of vinyl resins, that is, the reduced viscosity measured at 20°C as a 0.1 fiL/100-chloroform solution is 3.
It is preferable that the acrylic resin has a polymerization degree of 0 dt/Iu or more, and has a higher degree of polymerization than the chlorinated vinyl chloride resin used, and has good compatibility! It is desirable to use 5ρ selections. Desirable acrylic resins used for this purpose include methyl methacrylate polymers or copolymers mainly composed of methyl methacrylate, such as copolymers consisting of methyl methacrylate and acrylic esters, and copolymers with kneads. A copolymer with nJ-capable jlj, 94 is mentioned. Examples of the above-mentioned acrylic esters include methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, and 2-ethylhexyl acrylate, and monomers copolymerizable with them include styrene. , unsaturated nitrile, vinyl nitrile, ethyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, and other methacrylic acid esters other than methyl methacrylate. The reduced viscosity (molecular weight) of the acrylic polymer can be adjusted by known appropriate means during the polymerization operation, such as polymerization temperature, concentration of catalyst and chain transfer agent, etc. In general, products with large molecular weights can be produced by lowering the polymerization preparation, lowering the catalyst concentration, and lowering the chain transfer agent concentration. In addition, by using an emulsion polymerized product as the acrylic resin mentioned above, in addition to the above-mentioned effects, it also improves the penetration when molding this composition using an extruder, and prevents blockages in the raw material supply port. 1', it is possible to stably supply the C raw material, and the H force, torque, and extrusion speed of the extruder are constant, making it possible to stably obtain a foamed product. Similarly to the above-mentioned acrylic yarn #*' resin, styrene resin has a long compatibility with component (a), and when the resin composition is heated and melted, it increases the melt viscosity of the resin, gives rubber elasticity, and protects the resin. By improving the tensile strength or elongation rate of cumulative vinyl chloride resin at high temperatures and preventing the coalescence of pores or shrinkage of the cells that are formed during foaming, we can quickly absorb decomposed gases during foaming into the resin. It is used to raise the desired high-foamed molded product by holding it at a temperature of 100 mm and roasting it to the outside (l+/, 7 II-, ) shows a remarkable effect when used in combination with the above ingredients, resulting in a highly foamed molded product with an extremely low bulk specific gravity that has a uniform, fine cell structure and a uniform appearance.
Obtainable. The above styrene resin has styrene as its main component,
Copolymerization with acrylonitrile and/or these tl'
A copolymer with J t4f is desirable, and 0.19
-/100IIIL It is desirable to use a styrenic resin with a high degree of polymerization, which has a reduced viscosity measured as a chloroform solution at 20°C of 3.0 dt/y- or more and has good compatibility with component (a). Toki J (-Polymerizable intermediates include acrylic esters such as methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, and 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, Examples include methacrylic acid esters such as n-butyl methacrylate and ethylhexyl methacrylate, maleic acid, fumaric acid or their esters, and maleic anhydride. If the degree of polymerization of the polymer is high, it is desirable to use a polymer with a higher degree of polymerization.The above styrene resin may be manufactured by a conventionally known polymerization method, but in component (a) From the viewpoint of improving the dispersibility of 19 and obtaining a styrenic resin with a higher polymerization rate, those produced by the 11 polymerization method are preferred. (C) Acrylic resin and/or styrene resin as a component Use of resin! It is desirable to use resin in a range of 05 to 30 parts by weight, preferably 3 to 20 parts by weight, per 100 parts by weight of component (a) of No. 1-J. If it is less than 30, the above-mentioned effect cannot be obtained;
Even if it is used in more than a bare area, no special effect can be obtained due to heavy addition, but the flammability, etc. which the chlorinated 1-fluoride vinyl chloride-1. In addition,(
c) As ingredients, acrylic resin, styrene resin, and styrene resin may be used alone or in combination. Tree II+=? consisting of the above components (a) to (c)? ,
However, it is not supported to further add various additives that are added to the tevinyl resin to the 111 product as necessary. These should be kept within a range that does not impair the purpose or effect of the present invention. J>1 A resin composition consisting of the above-mentioned components (A) to (C) and additional fill components that may be added as necessary is fed to an extruder.1~ Volatile organic foaming at a boiling temperature of 90℃ After the agent is melted and kneaded, extrusion foam molding is performed to continuously obtain a foamed molded product with a fine cell structure and a high expansion ratio at a low cost. Specifically speaking, the resin 9 foam molded product provided by the present invention has a density of □□□ or 011/- or less (particularly 0.06 f/
* (D; J lower) with high expansion ratio 75
At the same time, it has a fine cell structure and an independent heat retention rate of 70 (particularly 75% or more).It also has a heat resistance temperature of 75°C and 80°C. As there is a product 7' with excellent heat resistance, it can be used as a heat insulation product in areas where conventional salt-based vinyl fruit resin e-foam moldings cannot be used, but where mixed use is relatively common. It is suitable for use as a heat insulating material, etc.
Volatile organic blowing agent 1 at 90°C pJ used for producing the above resin foam molding is an aliphatic hydrocarbon or an aliphatic halogen gas. Preferably, it is the first substance that can be reversely refracted from carboxyhydrogen, specifically, furopane, butane, dibutane, pentane, neohentane, n-hexitine, isohexane, n-hebutane, petroleum ether, and salt. Methyl, 1-methylene salt, chloroform, tetracyclic]'
Carbon, salt 41'ethyl, ethylidene chloride, trichloroethylene, 1,2-dichloroethane, trichlorofluoromethane, dichlorofluoromethane, promotofluoromethane, tetrafluoromethane, dichlorofluoromethane, chlorotrifluoromethane, trifluoromethane, trichlorotrifluoroethane , cyclobutrafluoroethane, dibromodetrafluoroethane, chloropentafluoroethane, hexafluoroethane, chlorodifluoroethane, difluoroethane, methyl ether,
Ethyl ether 7+ is exemplified by Toca. The use of these materials is not limited to one type, but two types may be used at the same time. Furthermore, the above boiling point 9
In order to produce a foam molded product with a high expansion ratio by uniformly melting and dispersing a volatile organic blowing agent at 0°C or lower in a resin composition,
Aromatic hydrocarbons that are compatible with vinyl chloride resins,
It is also effective to improve the compatibility with the aromatic and aromatic halogen (a) components such as halogen, ester, and ketone compounds. Volatile organic emissions/j′! The amount of the agent to be used can be adjusted depending on the density of the desired foamed molded product. The specific method for extrusion foam try-type is generally to first mix the raw resin composition in advance using a mixer such as a super mixer, feed this into an extruder, and then add the heated resin in the extruder. A predetermined portion of the volatile organic blowing agent mentioned above is introduced into the resin composition from the middle of the cylinder, and the organic blowing agent is melted into the resin composition in the melting zone in the cylinder. :1-Disperse (dissolved content ◆),
Thereafter, the resin composition is uniformly cooled to a temperature suitable for foaming, and extruded into the atmosphere or into a vacuum section to carry out foam molding. The organic blowing agent may be press-injected at any time as long as the organic blowing agent is not packed into the resin composition supply port and the resin composition is not chewed into the resin composition due to wrinkles, but it is especially important to inject the organic blowing agent into the resin composition supply port when the resin composition is heated in the extruder. Granules (often when the fatty acids are in a semi-gelled state or completely gelled state,
Even in this state of confusion, the organic blowing agent is easily and uniformly dispersed in the resin composition, resulting in a uniform

[A molded article with a cell structure and a high expansion ratio is obtained. By extrusion foam molding according to the uninvented method described above, I6 with a high expansion ratio having a uniform fine cell structure in various shapes such as plate-shaped, sheet-shaped, rod-shaped, and tube-shaped
, it is possible to continuously produce 1 μν of 1-lipid foam molded products at low cost. Here are some specific examples. However, in the following description: Polymer ((:
], -PVC), 4 parts of lead-based stabilizer, 1 stair! 1 part of lucium chloride, a foam homogenizing agent shown in the same table, and an acrylic resin or a styrene resin were mixed in a Henschel mixer. [Bubble L1-forming aid] Talc: Manufactured by Dousan Kaolin Co., Ltd., average particle size 1 to 3 μm. Mill lead flower O: Manufactured by Shiraishi Calcium Co., Ltd., calcium carbonate
Average particle size OO2 ~ 0.03 μm CM: Sankyo Kasei Co., Ltd. Cellmic] 33, Azoshika
Bonamide compound, decomposition temperature 130-180°C PTS: para-toluenesulfonyl hydrazide, decomposition temperature 110°C [Acrylic resin or styrene resin] b-t: Methyl methacrylate 90% by weight Age IJ/14 Butyl 10% in order Copolymer consisting of 70% by weight of styrene, reduced viscosity 9.5 dt/f S-: Copolymer consisting of 30% styrene, reduced viscosity 12 dt/7 (resin composition) is extruded and foam-molded using two connected compression molding machines having the configuration shown below, and the density of the foam (
y-/d), cell state, closed cell ratio (%), heat resistance temperature (
℃) was investigated. The results were as shown in Table 1. [Extruder configuration] The first stage extruder has a diameter of 20 mm, L/D = 25, and the cylinder has a blowing agent inlet 300 mm from the hopper side, from which a double plunger pump is connected. The blowing agent is connected to the mechanism that can be used. The second stage extruder connected to the tip of this first stage extruder has a diameter of [J diameter 25 mm, L/D = 28, and this tip has a diameter]
0mm land] OOmm round die is installed. [Conditions for press u' + foam molding] (11 1st stage extruder r) Temperature of each part of the cylinder (C3 to C3 from the hopper side): e, = ] 40 to 1fi0. C2=160~180C
3 = 170-190°C 19 Rotation speed: (iorpm (2) 2nd stage extruder 0 cylinder 1 each part and die temperature: C, = 1.40-100, C2 = 120-140
C3=110~]30. Die temperature = 120-140℃ Zero rotation speed: 25-30 rpm (3) Type of blowing agent press-fitted in a part of the cylinder of the first stage extruder Top and press-fit cap: Methyl chloride-trichlorofluoro [Jmethane 50:50
Weight ratio) The mixture was press-injected using a double plunger pump at a concentration of 13 to 16% by weight based on the raw resin composition [Measurement conditions for physical properties of foamed molded product] Cell condition: Evaluated by visual observation according to the following criteria did. A: Uniform fine cell structure with a cell diameter of 300 μm or less B: Uniform cell structure with a cell diameter of 300-1000 μm C: Independent cell structure with a 3T' average cell diameter of 1001000 a and poor uniformity Bubble rate (%): Petskuman air comparison formula specific gravity 1i
Measurement was performed using Model 930. The test piece was cut out to a size of 20 m + n x 20 mm x 40 mm, and the true volume of the foam test piece (ΔV: volume composed of independent cells) was determined by the air displacement method using the above specific gravity R1, and calculated using the following formula [ . Ta. V: Apparent volume of the test piece W: Vehicle volume of the test piece △V: True volume of the test piece measured with an air comparison type specific gravity needle α: Density heat resistance temperature of the plastic constituting the test piece c°C
): 20 pieces of foam molded product extruded from a round die.
Regarding the test piece cut out to mmX20mmX100+nm. Measure the dimensional change of the test piece by leaving it for 24 hours at each temperature at 5°C intervals from 60°C to 100°C. The heat resistance temperature (℃) is 17 with a maximum heating deformation temperature that does not exceed 17%. Example 2 (Experiments 1613-22) 100 parts of salt-accumulated vinyl chloride polymer (chlorine content: 67% by weight, average degree of polymerization: 670), 2 parts of powdered soot stabilizer, 1 part of calcium stearate and shown in Table 2. Using a raw material resin composition obtained by using a Henschel mixer with a mesh cell bubble equalization aid, acrylic or styrene thread resin, extrusion foam molding was carried out using the same extruder as in the previous example (the extrusion conditions were as in the previous example). ). However, the type of blowing agent and the perspiration phase (% of heavy phase relative to the raw resin composition) were set to 0 as shown in Table 2. . [Blowing agent] 'I''0Fk4: Trichlorofluoromethane D (
”FFi:: Dichlorobutratuluoroethane tSO
:isooctane 1) (jl'M: dichlorofluoromethane'rctt
'h:: Tetrachlorodifluoroethane [A17
[Ryl-based resin or styrene-based resin] E-2: Copolymer consisting of methacrylic alcohol, methyl 80% ethyl acrylate, 20% by weight, reduced viscosity 2 dl-/l- 8-2: Styrene 70@m% acrylic U nitrile Co-coalescence consisting of 30% polyester, reduced viscosity 2 dt/y- The physical properties of the obtained foam were as shown in Table 2. Example 3 (Experiments 7623-34) Two connected extruders as described below were used in this example. The first extruder has a diameter of 50 mm and L/D = 30, and the cylinder of the extruder is equipped with a blowing agent injection hole 100 cm from the hopper, from which the blowing agent is injected using a constant flow injection pump. This is a press-fitting mechanism. For the above extrusion, a second extruder with a diameter of 50 mm and L/D = 30 is connected to the tip of the bar, and a 5 mm extruder is connected to the tip of the second extruder.
Attach a temporary production die of x400mm. . [Original vehicle 8I resin composition] 100 parts of chlorinated vinyl chloride polymer (chlorine content: 66% by weight, average polymerization: 1!j760), 4 parts of lead-based stabilizer, 1 part of calcium stearate, 1 part of talc, CM (Cellmic) 133) and the following acrylic or styrene resin were mixed together using a Henschel mixer. E-3: Methyl methacrylate polymer, reduced viscosity 4, Od
t/f E-4: J↓-polymer consisting of 70% by weight of methyl methacrylate and 30% by weight of butyl acrylate, reduced viscosity: 8.5c
lt/j7- E-5: Copolymer consisting of methyl methacrylate 80% by weight butyl acrylate 20@drop%, reduced viscosity 13.5 dt/f E-6: Methyl methacrylate 70% by weight butyl acrylate 10 Copolymer consisting of 20% by weight of butyl methacrylate, reduced viscosity 10.5 dt/f S-3: Copolymer consisting of 70% by weight styrene, 30% by weight acrylonitrile, reduced viscosity 4.5 dt/Jil- 8-4: Copolymer consisting of styrene resin m% acrylonitrile 30%, reduced viscosity lO, Odl-/? S-5: Copolymer consisting of methoxy 2 fufu 2% by weight acrylonitrile 28% by weight, reduced viscosity 14.6 dt/7 [Type of blowing agent and amount of H] Trichlorofluoromethane - methyl chloride (80/20
) A mixed blowing agent is pressurized into the injection hole using a constant flow injection pump so that the amount of the mixed blowing agent is 15% by weight and 11% based on the raw resin composition. [Extrusion temperature conditions] 1st stage extruder (from cylinder temperature hopper side) C, =
]5r), c4=180, O:4=
190. 04== ] ROoC 2nd stage extruder (cylinder temperature from the connection side of the 1st stage extruder) "l + "2 + "3-→Dl as shown in the table
(Dice temperature) - Resin temperature of the second stage extruder head (dice inlet) as shown in the table T4-1 → I as shown in the table
) Under the above conditions, the first stage extruder was set at 60 rpm (extrusion amount: 40~
The density (f/d), cell state, closed cell ratio (%), and heat resistance temperature were measured for the plate-shaped foam obtained by extrusion foaming and operating at 45 Kl/hr). however,
The dimensions of the test piece for measuring the heat resistance temperature are 20m+nX 1
00mmX]O13mm. The results were as shown in Table 3.

Claims (1)

[Claims] 1. Chlorinated vinyl chloride resin, acrylic resin and/or
or a resin foam molded article 26 formed by foam molding a resin composition containing a styrene-based resin as a main component. The resin foam molded article 3 according to claim 1 has a temperature of 75° C. or higher, and the chlorinated vinyl chloride resin has a chlorine content of 60 to 7.
Case 1 according to claim 1, which is quintuple blockage%
Resin foam molded product 4, the blending ratio of acrylic resin and/or styrene resin per 100 parts by weight of chlorinated vinyl chloride resin is 0.
．． 5 to 30 parts by weight of resin foam molded article 5 according to claim 1, (a) chlorinated vinyl chloride resin 100 parts! ? Department,
(b) Pyrolytic foaming agent and/or high melting point fine powder substance 0.011 times a day, (8) Acrylic resin and/or styrene resin 0
．． A resin composition consisting of 5 to 30 parts by weight is supplied to an extruder, and a volatile organic blowing agent having a boiling point of 90° C. or less is melt-kneaded while being added, and then extrusion foam molding is completed. Manufacturing method for polyvinyl chloride resin foam molded product