KR100871560B1 - Composition for pvc based foam products and pvc based foam products using the same - Google Patents

Abstract

A poly(vinyl chloride)-based foam composition, and a poly(vinyl chloride)-based foam prepared by using the composition are provided to improve bleeding property, thermal stability and processability and to reduce the gelation time. A poly(vinyl chloride)-based foam composition comprises 100 parts by weight of a poly(vinyl chloride)-based resin; 6~8 parts by weight of a processing aid; 5~7 parts by weight of a heat resistant composite stabilizer; 6~10 parts by weight of a filler; 0.4~0.6 parts by weight of a foaming agent; and 0.05~0.3 parts by weight of a lubricant. The heat resistant composite stabilizer comprises 30~60 parts by weight of dibasic lead phosphite; 3~15 parts by weight of dibasic lead stearate; 5~20 parts by weight of calcium stearate; and 3~15 parts by weight of barium stearate.

Description

Composition for polyvinyl chloride-based foams and polyvinyl chloride-based foams using the same {COMPOSITION FOR PVC BASED FOAM PRODUCTS AND PVC BASED FOAM PRODUCTS USING THE SAME}

The present invention relates to a composition for polyvinyl chloride-based foam and a polyvinyl chloride-based foam using the same, and more particularly, by formulating the composition components in an appropriate content, by using a composite containing an inorganic acid salt and an organic acid salt as a heat stabilizer The present invention relates to a composition for polyvinyl chloride foam having excellent bleeding as well as thermal stability and processability, and a polyvinyl chloride foam using the same.

Polyvinyl chloride (PVC) is used as a base material for various products such as films, sheets, pipes, containers, and decorative materials because of its excellent physical, chemical, and electrical properties compared to low prices. By varying the molecular weight or added components of polyvinyl chloride, a hard or soft product can be obtained, and when a foaming agent is added, a lightweight foamed product can be produced. Particularly, rigid polyvinyl chloride foamed products have excellent surface properties and light weight, and thus are widely used for advertisement signs, interior decoration materials, and various building materials.

Polyvinyl chloride (PVC) is extremely limited in processing conditions because its pyrolysis temperature is close to the processing temperature of the product. Polyvinyl chloride alone hardly exhibits physical properties such as fluidity and mechanical strength (for example, impact resistance, tensile strength, fracture toughness strength, etc.) that can sufficiently satisfy processing conditions. Accordingly, a method of copolymerizing other monomers with the vinyl chloride monomer, or mixing and using a plasticizer or other resinous material is widely known. For example, a copolymer obtained by copolymerizing a vinyl chloride monomer with another monomer includes a copolymer of vinyl chloride and vinyl acetate, a vinyl chloride and acrylic ester copolymer, a copolymer of vinyl chloride and ethylene, and the like. As the plasticizer, epoxidized soybean oil, dioctylphthalate (DOP) and the like are used.

However, the above method has a drawback that the problem of processing cannot be solved while maintaining the excellent physical and chemical properties of polyvinyl chloride (PVC). For example, when copolymerizing a vinyl chloride monomer and another monomer, or adding a plasticizer, the softening temperature of the obtained molded object falls and mechanical strength falls. Most of the cases in which other resinous materials are mixed reduce the melt viscosity of the resin mixture to improve the workability in appearance, but the polyvinyl chloride (PVC) is not excellent in compatibility. Mechanical properties and transparency are inferior.

In addition, in order to improve impact strength as one of mechanical properties, a method of adding a steel sheet reinforcing agent to polyvinyl chloride (PVC) has been attempted. For example, Japanese Patent Laid-Open No. 9-278964 discloses a method of adding methyl methacrylate-butadiene-styrene copolymer (MBS copolymer) or chlorinated polyethylene (CPE) to polyvinyl chloride (PVC) as an impact modifier. Presented. However, when the impact modifier is added to the polyvinyl chloride (PVC) as described above, a large amount of reinforcing agent must be blended in order to give sufficient mechanical strength, which is expensive. Moreover, the fluidity | liquidity at the time of shaping | molding process does not improve, and the problem in terms of manufacturing conditions arises, for example, a motor load of an extruder becomes high.

On the other hand, in Japanese Patent Publications Nos. 40-5311 and 53-2898, in order to promote gelation or improve fluidity during molding processing without deteriorating the mechanical properties or transparency of the polyvinyl chloride (PVC) molded body. A method of blending a copolymer containing methyl methacrylate and the like as a main component as a processing aid has been proposed. However, this method promotes gelation without degrading the properties of polyvinyl chloride (PVC) to obtain a molded article having excellent transparency and fluidity. However, the appearance of the product is impaired because the added processing aid is likely to remain as a gelling agent. The problem is pointed out.

In addition, polyvinyl chloride (PVC) can not be processed without a heat stabilizer due to low thermal stability. Accordingly, heat stabilizers have been added for the purpose of inhibiting dehydrogenation, automatic oxidation inhibition, and chain scission prevention. For example, Korean Patent Publication No. 10-2005-0021042 discloses polyvinyl chloride (PVC) added with lead (Pb) composite stabilizers (tri lead sulfate, etc.), processing aids, and impact modifiers to improve processability and mechanical properties. The composition is shown. In addition, the Republic of Korea Patent No. 0722518, as a composition for the PVC foam sheet for producing a rigid PVC foam sheet in a free foam method that causes foaming at the same time extrusion, barium (Ba), lead (Pb), A resin composition for a polyvinyl chloride (PVC) foam sheet using organic acid salts of zinc (Zn), calcium (Ca), cadmium (Cd), and tin (Sn) as heat stabilizers is proposed.

[Patent Document 1] Japanese Patent Application Laid-Open No. 9-278964

[Patent Document 2] Japanese Patent Publication No. 40-5311

[Patent Document 3] Japanese Patent Publication No. 53-2898

[Patent Document 4] Republic of Korea Patent Publication No. 10-2005-0021042

[Patent Document 5] Republic of Korea Patent No. 0722518

As described above, polyvinyl chloride (PVC) is added with plasticizers, processing aids, heat stabilizers, impact modifiers, and the like, to enhance processability, heat stability, and mechanical properties. In addition, as shown in the above Patent Document 5, polyvinyl chloride (PVC) is further added with lubricants, pigments, fillers and the like in addition to the above components. In addition, when forming a foamed product, a blowing agent such as an azo compound (azo dicarbonamide, etc.) is added. Polyvinyl chloride (PVC) may be improved in the processing conditions or the mechanical properties of the molded body by the addition of processing aids, heat stabilizers and impact modifiers.

However, according to the prior art including the patent documents, although many additives as described above are included, there is a problem in that thermal stability, processability, transparency, etc., are poor, and bleeding properties are not good. In general, when manufacturing a rigid polyvinyl chloride (PVC) foam is used, such as a free-form (Free Foam) method, the foaming proceeds at the same time as extrusion. At this time, while the inside of the foam has a foam structure of a uniform cell (cell), the outer surface should be secured smooth appearance without bleeding (bleeding), the heat stabilizer according to the prior art bleeding (bleeding) It is weak and there is a problem of inhibiting the appearance of the foam. In addition, according to the prior art, it is pointed out that there are a lot of additive components as described above, the cost of the manufacturing process or purchase according to their combination is expensive.

The present invention is to solve the problems according to the prior art as described above, in the composition of the foamable polyvinyl chloride-based composition, each of the components to be added in an optimal composition to the optimum content, together with the inorganic acid salt as a heat stabilizer And by using a combination of organic acid salt, by using an appropriate composition of the content thereof, the composition for polyvinyl chloride-based foam having a high bleeding as well as thermal stability and processability to minimize the type of added components and this The object is to provide a polyvinyl chloride-based foam used.

In addition, the present invention provides a polyvinyl chloride-based foam composition and a polyvinyl chloride-based foam using the same by using a processing aid and a plasticizer in one particle, thereby simplifying the mixing process and shortening the gelation time, thereby improving workability. The purpose is to provide.

In order to achieve the above object, the present invention, the processing aid 6 to 8 parts by weight based on 100 parts by weight of polyvinyl chloride (PVC) -based resin; 5 to 7 parts by weight of the composite heat stabilizer; 6 to 10 parts by weight of the filler; 0.4 to 0.6 parts by weight of blowing agent and 0.05 to 0.3 parts by weight of lubricant,

The composite heat stabilizer, 30 ~ 60 parts by weight of dibasic red phosphite (DLP; Dibasic Lead Phosphite) based on 100 parts by weight of the total heat stabilizer; Dibasic Red Stearate (DBL; 3 to 15 parts by weight); Provided is a composition for polyvinyl chloride (PVC) foam containing 5 to 20 parts by weight of calcium stearate (Ca-St; calcium stearate) and 3 to 15 parts by weight of barium stearate (Ba-St).

The processing aid is preferably in the form of a capsule containing a plasticizer, wherein the plasticizer is preferably contained in 10 to 500 parts by weight based on 100 parts by weight of the processing aid.

In addition, the present invention provides a polyvinyl chloride-based foam that is foamed and molded by using the above foam composition.

At this time, the foam according to the present invention, by heating and kneading the foam composition for 8 to 15 hours at 120 ℃ ~ 130 ℃, and supplies the heated and kneaded composition to the extruder in a barrel of 160 ℃ ~ 210 ℃ After gelling, it is preferably manufactured by foaming and molding by passing through a mold.

According to the present invention, each component to be added is appropriately formulated to an optimal content, and as a heat stabilizer, a complex heat stabilizer having an appropriate composition of an inorganic acid salt and an organic acid salt is used, so that thermal stability, processability and transparency, as well as bleeding properties, are used. It has the effect of producing this excellent polyvinyl chloride-based foam. In addition, the kind of components to be added is minimized, and in particular, the processing aid and the plasticizer are compounded into one particle and then added to simplify the compounding process and shorten the gelation time.

Hereinafter, the present invention will be described in more detail.

Foam composition according to the present invention comprises at least a polyvinyl chloride (PVC) -based resin, processing aids, composite heat stabilizer, filler, foaming agent and lubricant.

The polyvinyl chloride (PVC) -based resin includes a copolymer obtained by copolymerizing another monomer with a vinyl chloride homopolymer as well as a vinyl chloride homopolymer. In this case, the vinyl chloride monomer includes not only vinyl chloride monomer but also vinylidene chloride monomer, vinyl acetate monomer or a mixture thereof. The copolymer may be selected from those containing 50% by weight or more, preferably 70% by weight or more of the vinyl chloride monomer. Examples of the copolymer include, but are not limited to, copolymers of vinyl chloride and vinyl acetate, copolymers of vinyl chloride and acrylate esters, copolymers of vinyl chloride and ethylene, and the like. As a commercialized product, P-800 of Hanwha Chemical Co., Ltd. can be usefully used.

The polyvinyl chloride (PVC) -based resins include plasticized and non-plasticized ones. In this case, when using an unplasticized polyvinyl chloride-based (PVC) resin, a plasticizer may be further included in the composition, and the plasticizer is included in the composition in a state of being included in the processing aid according to a preferred embodiment of the present invention. . Such polyvinyl chloride (PVC) -based resin is not particularly limited, but may be selected from those having a degree of polymerization of 100,000 or less, preferably 700 to 900, and more preferably 800. Hereinafter, the polyvinyl chloride (PVC) resin is abbreviated as "PVC resin".

The processing aid may be usefully applied to the present invention as long as it can promote gelation or improve fluidity during molding, and may be selected from, for example, methyl methacrylate resin. As commercialized products, LG Chem's PA-930, etc., can be usefully used. Such processing aid is included in 6 to 8 parts by weight based on 100 parts by weight of the PVC-based resin. At this time, if the content of the processing aid is less than 6 parts by weight of the effect (improving processability through the promotion of gelation and fluidity, etc.) due to its content is insignificant, and if more than 8 parts by weight will remain as a gelate as in the prior art It is not preferable because it may damage the appearance of the product.

According to the present invention, the composite heat stabilizer is to improve heat stability as well as processability and bleeding property (phenomena that do not bleed to the surface of the product) and the like, which is 5 to 7 weight parts based on 100 parts by weight of the PVC-based resin. It is included in wealth. At this time, when the content of the composite heat stabilizer is less than 5 parts by weight, it is difficult to improve the heat stability, processability and bleeding properties, etc., which are desired in the present invention. And economically undesirable.

According to the present invention, the composite heat-resistant tablet is a complex in which one inorganic acid salt and three organic acid salts are formed in an appropriate content. Specifically, the composite heat stabilizer is dibasic red phosphite (DLP; Dibasic Lead Phosphite) as an inorganic acid salt, dibasic red lead stearate (DBL) as an organic acid salt, and calcium stearate (Ca-St; calcium). stearate) and barium stearate (Ba-St; Barium Strearate).

At this time, the dibasic red phosphite (DLP) is a base component of the composite heat stabilizer for thermal stability, which is contained in 30 to 60 parts by weight based on 100 parts by weight of the total composite heat stabilizer. When the content of the dibasic red phosphite (DLP) is less than 30 parts by weight, the thermal stability may be insignificant. When the content of the dibasic red phosphite is less than 60 parts by weight, the content of other components may be relatively small, thereby decreasing the activity of the heat stabilizer. The basic red stearate (DBL) is to improve the water resistance and activity, in particular bleeding (Bleeding) as well as thermal stability, which is contained in 3 to 15 parts by weight based on 100 parts by weight of the total composite heat stabilizer. When the content of the dibasic red stearate (DBL) is less than 3 parts by weight, the above properties (water resistance, active bleeding resistance), in particular, lack of bleeding resistance, the heat stabilizer may bleed to the surface of the foamed product, 15 If the content is more than% by weight, the synergistic effect of the excess content is not large and the content of other components is relatively small, which is not preferable. In addition, the calcium stearate (Ca-St) is to improve heat resistance and activity, in particular transparency and processability, which is contained in 5 to 20 parts by weight based on 100 parts by weight of the total composite heat stabilizer. When the content of calcium stearate (Ca-St) is less than 5 parts by weight, it is difficult to improve transparency and processability, and when it exceeds 20 parts by weight, the content of dibasic red phosphite (DLP), etc. becomes relatively small. Stability may be compromised. In addition, the barium stearate (Ba-St) is to improve the activity, in particular gelling properties and lubricity during extrusion, it is contained in 3 to 15 parts by weight based on 100 parts by weight of the total composite heat stabilizer. When the content of the barium stearate (Ba-St) is less than 3 parts by weight, it is difficult to improve the gelability and the lubricity during extrusion, and when the content exceeds 15 parts by weight, the synergistic effect of the excess content is not large and the de The content of basic red phosphite (DLP), etc. may be reduced, resulting in poor thermal stability.

According to the present invention, in the case of using the above-described complex heat stabilizer of the inorganic acid salt and the organic acid salt as the heat stabilizer, heat stability, processability (activity, gelling property, etc.), transparency and bleeding property are improved. In addition, it is possible to reduce the amount of the lubricant (lubricant) and the like added by the use of the composite heat stabilizer.

The complex heat stabilizer may further include a pigment or an additive in addition to the inorganic acid salt and the organic acid salt as described above. The pigment may be selected from, for example, a white inorganic pigment such as titanium dioxide, and may be contained in an amount of 1 to 2 parts by weight based on 100 parts by weight of the total composite heat stabilizer. In addition, the additive may include an initial color inhibitor selected from zinc stearate (Zn-St; zinc strearate) and the like, and such additives may be included in an amount of 8 to 15 weights based on 100 parts by weight of the total composite heat stabilizer. .

The said filler is not specifically limited, The thing of the range which does not impair the objective of this invention can be used. The filler may be used, for example, by mixing one or two or more selected from calcium carbonate, magnesium carbonate, lithium carbonate, gypsum, mica, talc, magnesium hydroxide, aluminum hydroxide, calcium silicate, calcium aluminate, borax, and the like. Can be. As commercialized products, TL-1000 of Dongho Calcium Co., Ltd. in Korea can be usefully used. These fillers are included in 6 to 10 parts by weight based on 100 parts by weight of the PVC-based resin. In this case, if the content of the filler is less than 6 parts by weight, the effect (strength reinforcement, etc.) according to its content is insignificant, and if it exceeds 10 parts by weight, the processability (gelling property, etc.) of PVC may be inhibited, which is not preferable. The filler is preferably surface-treated with a silane coupling agent, a titanate coupling agent, stearic acid, or the like for dispersibility with PVC or improvement of mechanical strength of the product.

The blowing agent may be used as long as it can form a foam structure, for example, p, p'-oxybis (benzenesulfonyl hydrazide), benzenesulfonyl hydrazide, toluenesulfonyl hydra Sulfonyl hydrazide compounds such as jides; Azo compounds such as azodicarbonamide (ADCA) and azobisisophthtonitrile; Organic blowing agents such as nitroso-based compounds such as N, N'-dinitrosopentamethylenetetramine, N, N'-dimethyl-N, N'-dinitrosoterephthalamide and the like can be used. As a commercialized product, AZO-K of Kumyang Co., Ltd. can be usefully used. Such a blowing agent is included in 0.4 to 0.6 parts by weight based on 100 parts by weight of the PVC-based resin. In this case, if the content of the blowing agent is less than 0.4 parts by weight, the foaming rate is lowered, which is not preferable. When the content of the blowing agent is more than 0.6 parts by weight, the open cellization rate is increased, which makes it difficult to form a uniform closed cell in the entire product.

The lubricant is not particularly proposed as long as it can provide fluidity to the mold release property or composition with a mold (extrusion die), and higher fatty acids having 12 to 24 carbon atoms (and salts thereof), alcohols, esters, polyolefin waxes, and the like. Can be selected from. For example, lubricants are stearic acid, lauric acid, palmitic acid, myristic acid, lithium stearate, calcium palmitate, mineral oil, polyvinyl stearate, polyethylene wax (PE-wax) and paraffin wax 1 type, or 2 or more types selected from these etc. can be mixed and used. Such a lubricant (lubricant) is included from 0.05 to 0.3 parts by weight based on 100 parts by weight of the PVC-based resin. At this time, if the content of the lubricant is less than 0.05 parts by weight, it is difficult to achieve the effect (releasing property, fluidity, etc.) according to the content thereof, and if it exceeds 0.3 parts by weight, the synergistic effect due to the excessive content is insufficient and is not preferable in terms of economy.

Foam composition according to the present invention, the above components are made up in an appropriate amount, it may be further included pigments, impact modifiers and / or plasticizers as usual.

The pigment is not particularly limited and includes organic pigments and inorganic pigments. For example, organic pigments, such as an azo system, a phthalocyanine system, a styrene system, and dye lake system; Inorganic pigments, such as an oxide type, molybdenum chromium type, and a ferrocyanide type, etc. can be used. Specific examples of the oxide may include rutile titanium dioxide (R-TiO ₂ ), and the like, and SR-508 may be usefully used as a commercially available product. In addition, the pigment may be used as well as fluorescent pigments as described above. Such pigment is preferably included in 0.5 to 5.0 parts by weight based on 100 parts by weight of the PVC-based resin. If the content of the pigment is less than 0.5 parts by weight it may be difficult to implement the color, when the content of more than 5.0 parts by weight lacks the synergistic effect due to the excess content is not preferable in terms of economics.

In addition, the impact modifier may be used that is commonly used, for example methacrylate butadiene-styrene (Methacrylate butadiene styrene (MBS), acrylic (Acrylic), acrylonitrile butadiene-styrene (Acrylonitrile butadiene styrene; Acrylics such as ABS); Ethylene-based compounds such as chlorinated polyethylene (CPE) and ethylene vinyl acetate (EVA), which have been chlorinated with a plasticizing polymer; At least one selected from inorganic systems and the like coated with calcium carbonate with stearin can be used. Such an impact modifier is not particularly limited but may be included in an amount of 0.1 to 5.0 parts by weight based on 100 parts by weight of the PVC-based resin.

The said plasticizer is not specifically limited, The thing of the range which does not impair the objective of this invention can be used. Plasticizers include, for example, phthalic acid esters such as di-2-ethylhexyl phthalate, di-n-octyl phthalate, di-isononyl phthalate, dibutyl phthalate; Phosphoric acid esters such as tricresyl phosphate, trixylyl phosphate and triphenyl phosphate; Fatty acid esters such as di-2-ethylhexyl adipate and di-2-ethylhexyl sebacate; One or two or more selected from epoxy-based compounds such as epoxidized soybean oil, epoxidized linseed oil, epoxidized tetrahydrophthalate and epoxidized polybutadiene can be used, and the amount thereof is not particularly limited. As long as it is a range which does not damage, when used, Preferably it is 80 weight part or less with respect to 100 weight part of PVC-type resin. In addition, when the said plasticizer is used, it is good to add in the state contained in a processing aid, as demonstrated below.

According to a preferred embodiment of the present invention, the processing aid is preferably prepared in the form of capsules containing plasticizer and included in the composition. In this case, the compounding process can be simplified and the gelation can be promoted than the method of adding the processing aid and the plasticizer, respectively. At this time, the plasticizer may be contained in 10 to 500 parts by weight based on 100 parts by weight of the processing aid.

The capsule processing aid (containing a plasticizer) can be prepared by an emulsion emulsion polymerization method. Specifically, it can be prepared by polymerizing an emulsion comprising monomers, plasticizers, emulsifiers, initiators and deionized water for processing aids. At this time, the plasticizer may be included as 10 to 500 parts by weight of the plasticizer with respect to 100 parts by weight of the monomer. If the content of the plasticizer is less than 10 parts by weight, the effect of the addition of the plasticizer is insignificant, and if it exceeds 500 parts by weight, it is not preferable because the formation of the capsule-shaped particles is difficult. The emulsifier is preferably 0.05 to 3 parts by weight, 0.01 to 0.3 parts by weight of the initiator, and 100 to 500 parts by weight of deionized water, based on 100 parts by weight of the monomer. After mixing these components, the particle size is 100 using a Microfluidizer, Ultrasonifier, Manton-Gaulin homogenizer or Omni-Mixer. After homogenizing to ˜2000 nm, the mixture is put into a polymerization reactor, heated to a temperature of 50 to 100 ° C., polymerized, and then prepared in a particulate form through a powdering process such as a coagulation method or a spray drying method.

The monomer is a component constituting the processing aid, the methyl methacrylate as the main component (50 to 100% by weight), the auxiliary component is copolymerizable by the main component and free radicals, ethyl acrylate, hydroxyethyl methacryl Rate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, n-hexyl acrylate, n-hexyl methacrylate, ethylhexyl acrylate, ethylhexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, decyl acrylate, decyl methacrylate, dodecyl acrylate, dodecyl methacrylate, stearyl acrylate, stearyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, 4 -tert-butylcyclohexyl methacrylate, benzyl acrylate, benzyl methacrylate, phenylethyl acrylate Acrylate, phenylethyl methacrylate, phenylpropyl acrylate, phenylpropyl methacrylate, phenylnonyl acrylate, phenylnonyl methacrylate, 3-methoxybutyl acrylate, 3-methoxybutyl methacrylate, butoxy Ethyl Acrylate, Butoxyethyl Methacrylate, Diethylene Glycol Monoacrylate, Diethylene Glycol Monomethacrylate, Triethylene Glycol Monoacrylate, Triethylene Glycol Monomethacrylate, Tetraethylene Glycol Monoacrylate, Tetra Methacryl or acrylic monomers such as ethylene glycol monomethacrylate, furfuryl acrylate, furfuryl methacrylate, and nitrile monomers such as acrylonitrile or methacrylonitrile, styrene, alphamethyl styrene or vinyl toluene Monomers with double bonds and other methyl The monomer etc. which can copolymerize with a methacrylate (main component) can be used, It can select and use 1 or more types from these groups, It is not limited to these monomers.

In addition, the plasticizer may be selected from phthalic acid esters, phosphate esters, fatty acid esters and epoxys as described above, and the emulsifiers are, for example, alkylbenzenesulfonic acids, sodium alkylbenzenesulfonates, alkylsulfonic acids, sodium alkyls. What is widely used for emulsion polymerization, such as a sulfonate, sodium polyoxyethylene nonylphenylether sulfonate, sodium stearate, sodium dodecyl sulfate, sodium lauryl sulfate, sodium dodecyl sulfosuccinate, abietin acid salt, can be used have. In addition, the initiator may use an initiator that generates free radicals, for example, a peroxide-based, azo-based compound and the like can be used.

On the other hand, the foam composition according to the present invention may be further added one or more adducts selected from antioxidants, light stabilizers, flame retardants and the like as needed. Examples of the antioxidant include phenolic antioxidants, and the amount of the antioxidant is not particularly limited, but when used, preferably 5 parts by weight or less based on 100 parts by weight of the PVC resin. In addition, the light stabilizer can be used those having ultraviolet absorbing properties such as salicylic acid esters, benzophenones, benzotriazoles, cyanoacrylates, and when used, preferably 100 parts by weight of PVC resin 5 parts by weight or less is preferable. In addition, the flame retardant may be selected from those which are added as a flame retardant to a common building material, and examples thereof include a halogen-based compound. And the use amount is 2 weight part or less with respect to 100 weight part of PVC-type resin.

The composition for foam according to the present invention described above is not particularly limited in its production method, and the processing aid, the composite heat stabilizer, the filler, the foaming agent and the lubricant are blended with PVC resins in an appropriate amount, and various additives ( Pigments, impact modifiers, plasticizers, antioxidants, light stabilizers, flame retardants, etc.), for example, a ribbon blender, super mixer, tumbler mixer, Banbury mixer, Henschel mixer, mixing roll, etc. It can be produced by a method such as uniformly mixing or mixing and kneading by a conventional method such as hot blend or cold blend using a group or the like.

Preferably, the above composition ingredients are supplied to the kneader and heated and kneaded at a temperature of 120 ° C. to 130 ° C. for 8 to 15 hours. In addition, the heated and kneaded composition may be cooled and then stored and stored to be useful for preparing a foam product.

On the other hand, the foam according to the present invention is included in the present invention as long as foamed and molded using the foam composition of the present invention as described above, for example, through the injection or extrusion process sheet (sheet), panel (panel) Or it may have a three-dimensional shape. And the foam according to the present invention can be used for advertising signs, interior decoration, various building materials and the like.

The foam according to the present invention may be produced by extrusion processing of a free foam method, which preferably causes extrusion and foaming at the same time. More specifically, the composition heated and kneaded as described above is fed to an extruder hopper and gelled in a barrel of 160 ° C to 210 ° C, and then passed through a mold (extrusion die) by screw rotation in the extruder, It can be manufactured to have a foamed structure at the same time. At this time, the inside has a foam structure and the outside has a smooth surface.

Claims (5)

6 to 8 parts by weight of processing aids based on 100 parts by weight of polyvinyl chloride-based resin; 5 to 7 parts by weight of the composite heat stabilizer; 6 to 10 parts by weight of the filler; 0.4 to 0.6 parts by weight of blowing agent and 0.05 to 0.3 parts by weight of lubricant, The composite heat stabilizer, 30 ~ 60 parts by weight of dibasic red phosphite (DLP; Dibasic Lead Phosphite) based on 100 parts by weight of the total heat stabilizer; Dibasic Red Stearate (DBL; 3 to 15 parts by weight); 5 to 20 parts by weight of calcium stearate (Ca-St; calcium stearate) and 3 to 15 parts by weight of barium stearate (Ba-St; composition for polyvinyl chloride-based foam, characterized in that it contains. The method of claim 1, The processing aid is a particulate polyvinyl chloride foam composition comprising a plasticizer. The method of claim 2, Plasticizer is a composition for polyvinyl chloride-based foam, characterized in that contained in 10 to 500 parts by weight relative to 100 parts by weight of the processing aid. A polyvinyl chloride-based foam, which is foamed and molded using the composition for polyvinyl chloride-based foam according to any one of claims 1 to 3. The foam of claim 4 wherein the foam is The composition for polyvinyl chloride foam was heated and kneaded at 120 ° C. to 130 ° C. for 8 to 15 hours, and the heated and kneaded composition was fed to an extruder and gelated in a barrel at 160 ° C. to 210 ° C., and then passed through a mold. Polyvinyl chloride-based foam, characterized in that the foamed and molded.