JP2018059004A - Vinyl chloride-based resin composition and extrusion molding for window frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vinyl chloride-based resin composition capable of providing an extrusion molding that shows excellent woody appearance and is excellent in heat resistance, and to provide an extrusion molding for window frame and a window frame using the vinyl chloride-based resin composition.SOLUTION: A vinyl chloride-based resin composition contains a vinyl chloride-based resin and ultrahigh molecular weight polyethylene having a viscosity average molecular weight of 1,000,000 or more. Preferably, the vinyl chloride-based resin composition contains the vinyl chloride-based resin as a main component and 0.1-100 pts.mass of adhesive ultrahigh molecular weight polyethylene with respect to 100 pts.mass of the vinyl chloride-based resin. Preferably, an average particle diameter of the ultrahigh molecular weight polyethylene is 1-200 μm. An extrusion molding for window frame has a base material formed from a thermoplastic resin, and a skin layer which is layered on the base material and is formed from the vinyl chloride-based resin composition.SELECTED DRAWING: None

Description

  The present invention provides a vinyl chloride resin composition capable of providing a window frame having a surface appearance that is very similar to natural wood, excellent in woody design, and excellent in heat resistance, and the vinyl chloride resin composition. The present invention relates to an extruded product for a window frame and a window frame.

Vinyl chloride resin is generally excellent in physical properties such as impact resistance and heat resistance and weather resistance, and is relatively inexpensive, so it can be used for interior / exterior building materials for housing, wire coating materials, vehicles such as automobiles, etc. Widely used in interior and exterior members, electrical equipment members, furniture, and the like.
Moreover, in the interior / exterior building materials for houses, various methods (for example, Patent Documents 1 and 2, etc.) have been tried to produce extruded products that are oriented to natural wood and have a grain pattern.

A thermoplastic resin composition containing finely pulverized wood powder as a filler has been known for a long time to give a texture close to that of natural wood, and in particular, a vinyl chloride resin composition has excellent colorability and moldability. And since it is relatively inexpensive, it is widely used in such applications.
For example, a molded product using wood powder mixed with a vinyl chloride resin composition has the characteristics of wood and vinyl chloride resin, and has a high design with a wood texture. Used for interior building materials such as surrounding edges.

On the other hand, in order to synchronize with the design of interior building materials and to express the wood texture, a window frame made of resin that is molded by mixing fine powders such as wood powder with a resin extrusion for window frames is proposed. Has been.
In addition, in order to enhance the wood texture of products, extrusion for window frames using a vinyl chloride resin composition containing a vinyl chloride resin containing a cross-linked gel instead of wood flour that causes a significant decrease in physical properties when mixed in large amounts. Many molded articles (for example, Patent Document 3) are also used.

  However, as the environment of use becomes higher due to changes in the natural environment, in recent years, the demand for heat resistance required for interior and exterior building materials for houses has been increasing. The existing woody vinyl chloride resin composition that is contained cannot currently satisfy the required characteristics for heat resistance.

Japanese Patent Publication No.57-55735 Japanese Patent Publication No. 63-53216 JP 2002-194160 A

  The problem to be solved by the present invention is to provide a vinyl chloride resin composition capable of providing an extruded product having an excellent woody appearance and excellent heat resistance, and the use of this vinyl chloride resin composition. Another object of the present invention is to provide an extruded product for a window frame and a window frame.

  As a result of intensive studies to solve the above problems, the present inventors have found that a vinyl chloride resin composition in which a specific ultrahigh molecular weight polyethylene is blended in a predetermined ratio with respect to a vinyl chloride resin has an excellent woody tone. The present inventors have found that an extruded product having an appearance and excellent heat resistance can be provided, resulting in the present invention. That is, the gist of the present invention resides in the following [1] to [10].

[1] A vinyl chloride resin composition comprising a vinyl chloride resin and an ultrahigh molecular weight polyethylene having a viscosity average molecular weight of 1,000,000 or more.

[2] The vinyl chloride resin composition according to [1], comprising a vinyl chloride resin as a main component and 0.1 to 100 parts by mass of the ultra high molecular weight polyethylene with respect to 100 parts by mass of the vinyl chloride resin.

[3] The vinyl chloride resin composition according to [1] or [2], wherein the ultra high molecular weight polyethylene has an average particle diameter of 1 to 200 μm.

[4] The vinyl chloride resin composition according to any one of [1] to [3], wherein the center line average roughness Ra of the surface of the extruded product of the vinyl chloride resin composition is 0.5 μm or more.

[5] The vinyl chloride resin composition according to any one of [1] to [4], which is used for applications in which an extruded product having a base material made of a thermoplastic resin is laminated as a skin material.

[6] The vinyl chloride resin composition according to any one of [1] to [5], which is a vinyl chloride resin composition for window frames.

[7] An extruded product of the vinyl chloride resin composition according to any one of [1] to [6].

[8] A window frame having a base material made of a thermoplastic resin and a skin layer made of the vinyl chloride resin composition according to any one of [1] to [6] laminated on the base material. Extruded product.

[9] The extruded product for window frames according to [8], wherein the thermoplastic resin is a vinyl chloride resin.

[10] A window frame comprising the extruded product for window frames of [8] or [9].

  According to the vinyl chloride resin composition of the present invention, it is possible to obtain an extrusion-molded product that exhibits an appearance excellent in woody design and is also excellent in heat resistance. Therefore, according to the extrusion molded product for window frames and the window frame using the vinyl chloride resin composition of the present invention, it is a window frame product that is very similar to natural wood and excellent in design, and excellent in heat resistance, It is possible to provide a window frame product that sufficiently satisfies the recent required level of high-temperature heat resistance.

  Hereinafter, the present invention will be described in detail, but the present invention is not limited to the following description, and can be arbitrarily modified and implemented without departing from the gist of the present invention. In addition, in this specification, when expressing by putting a numerical value or a physical-property value before and behind using "-", it shall use as what includes the value before and behind.

[Vinyl chloride resin composition]
The vinyl chloride resin composition of the present invention comprises a vinyl chloride resin and an ultra-high molecular weight polyethylene having a viscosity average molecular weight of 1,000,000 or more, preferably a vinyl chloride resin as a main component, and a vinyl chloride resin of 100 mass. 0.1 to 100 parts by mass of ultrahigh molecular weight polyethylene having a viscosity average molecular weight of 1,000,000 or more per part by weight.

The vinyl chloride resin composition of the present invention includes a super high molecular weight polyethylene having a viscosity average molecular weight of 1,000,000 or more, and thus can give a woody appearance to the obtained extruded product and has excellent heat resistance. It can be a molded product.
That is, ultra high molecular weight polyethylene having a viscosity average molecular weight of 1 million or more is dissolved by being left undissolved even at the melting temperature of the vinyl chloride resin composition when molding a vinyl chloride resin composition mixed with the vinyl chloride resin. The remaining ultrahigh molecular weight polyethylene gives the surface roughness of the molded product, and the resulting molded product can be given a wood texture very similar to natural wood.
In addition, ultra high molecular weight polyethylene having a viscosity average molecular weight of 1,000,000 or more itself is excellent in heat resistance, and thus can be formed into a molded product excellent in heat resistance.
In the present invention, the “main component” refers to a component usually contained in the composition in an amount of 50% by mass or more, preferably 55% by mass or more, more preferably 60% by mass or more.

<Vinyl chloride resin>
Examples of the vinyl chloride resin contained in the vinyl chloride resin composition of the present invention include vinyl chloride or a mixture of vinyl chloride and a monomer copolymerizable therewith with a suspension polymerization method, a bulk polymerization method, a fine suspension. Examples thereof include a polymer or copolymer produced by polymerization by a usual method such as a turbid polymerization method or an emulsion polymerization method.

  Examples of monomers copolymerizable with vinyl chloride include vinyl esters such as vinyl acetate, vinyl propionate and vinyl laurate; acrylic acid esters such as methyl acrylate, ethyl acrylate and butyl acrylate; methyl methacrylate and ethyl Methacrylic acid esters such as methacrylate; Maleic acid esters such as dibutyl maleate and diethyl maleate; Fumarate esters such as dibutyl fumarate and diethyl fumarate; Vinyl ethers such as vinyl methyl ether, vinyl butyl ether and vinyl octyl ether Vinyl chlorides such as acrylonitrile and methacrylonitrile; α-olefins such as ethylene, propylene and styrene; vinylidene halides other than vinyl chloride such as vinylidene chloride and vinyl bromide; Vinyl halides; diallyl phthalate, although polyfunctional monomers such as ethylene glycol dimethacrylate, a monomer is not limited to those described above to be used. These monomers may be used individually by 1 type, and may use 2 or more types together.

  When using the above-mentioned monomer copolymerizable with vinyl chloride for the production of vinyl chloride resin, the monomer should be used in the range of 30% by mass or less in the constituents of vinyl chloride resin. It is more preferable to use so that it may become 20 mass% or less.

  The vinyl chloride resin used in the present invention includes a post-chlorination vinyl chloride-based resin produced by the above-described method. Further, a crosslinked vinyl chloride resin containing a crosslinked gel component insoluble in tetrahydrofuran (hereinafter referred to as THF) crosslinked by adding a crosslinking agent during polymerization is also included.

  The average degree of polymerization of the vinyl chloride resin used in the present invention is preferably in the range of 500 to 3500, more preferably 800 to 1400, based on JIS K6721 in view of its workability, moldability and physical properties. Range. When the average degree of polymerization is not less than the above lower limit, the physical properties of the obtained vinyl chloride resin composition tend to be better, and when it is not more than the above upper limit, workability and moldability tend to be better. is there.

  In the present invention, for the purpose of controlling the design surface of the obtained molded product, a crosslinked vinyl chloride resin containing the aforementioned crosslinked gel can be used as the vinyl chloride resin. That is, if an uncrosslinked vinyl chloride resin is used, a molded article having a glossy appearance can be obtained, and if a crosslinked vinyl chloride resin is used, a molded article having a dull appearance can be obtained. These may be appropriately selected and used according to the application to which the vinyl chloride resin composition is applied. As described above, when the vinyl chloride resin contains a THF-insoluble cross-linked gel content, the cross-linked gel content of the vinyl chloride resin as a whole is preferably not more than the above upper limit, and the average degree of polymerization of the portion dissolved in THF Is preferably in the above range.

  In the present invention, only one kind of vinyl chloride resin may be used, and two or more kinds of vinyl chloride resins having different copolymer compositions, types of copolymerization monomers, average degree of polymerization, presence / absence of crosslinking, and the like may be used. You may mix and use.

  As described above, the vinyl chloride resin composition of the present invention is usually 50% by mass or more, preferably 55% by mass or more, more preferably 58% by mass or more, particularly preferably 60 to 80% based on the vinyl chloride resin. Including mass%.

<Ultra high molecular weight polyethylene>
The ultra high molecular weight polyethylene contained in the vinyl chloride resin composition of the present invention is ultra high molecular weight polyethylene (UHMW-PE) having a viscosity average molecular weight of 1,000,000 or more.
Ultra high molecular weight polyethylene having a viscosity average molecular weight of 1,000,000 or more is known to be a polyethylene resin having a very large molecular weight and a linear molecular structure having almost no branched chain.

In the present invention, the viscosity average molecular weight Mv of ultrahigh molecular weight polyethylene is the ratio of a decalin solution having a concentration of 0.05% at 135 ° C. instead of the intrinsic viscosity [η] (dl / g) according to the method shown in ASTM D4020. A value that is approximated using the viscosity ηsp (dl / g) and calculated by the following formula (I) is adopted.
Mv = 5.37 × 10 ⁴ ηsp ^1.37 (I)

  The ultra high molecular weight polyethylene used in the present invention has a viscosity average molecular weight calculated by the above formula (I) of 1,000,000 or more. When the viscosity average molecular weight of the ultrahigh molecular weight polyethylene is less than 1,000,000, the effect of the present invention, that is, the woody appearance and excellent heat resistance cannot be achieved. The viscosity average molecular weight of the ultra high molecular weight polyethylene used in the present invention is particularly preferably 1.5 million or more, and more preferably 1.9 million or more, from the viewpoint of the woody appearance and heat resistance. However, if the viscosity average molecular weight of the ultra high molecular weight polyethylene is excessively large, the fluidity of the ultra high molecular weight polyethylene is poor, and the dispersibility during the production of the vinyl chloride resin composition may be lowered or the fluidity may be impaired. The viscosity average molecular weight of the ultrahigh molecular weight polyethylene is preferably 30 million or less, particularly preferably 10 million or less.

Such ultra high molecular weight polyethylene is manufactured or provided not in pellets but in particles (powder). The average particle size of the particulate ultrahigh molecular weight polyethylene is preferably 1 to 200 μm, more preferably 5 to 50 μm, and still more preferably 10 to 30 μm. When the average particle size of the ultrahigh molecular weight polyethylene is not more than the above upper limit, it is usually smaller than the vinyl chloride resin particles having an average particle size of about 50 to 250 μm, and the uneven distribution of coarse particles is reduced. By the ultrahigh molecular weight polyethylene particles that appear on the surface of the vinyl chloride resin composition molded product as being above the lower limit, the surface of the molded product is given roughness, The wood texture tends to be exposed, which is preferable.
In addition, the average particle diameter of the ultra high molecular weight polyethylene referred to in the present invention may be the particles before the composition is formed, or may be the particle diameter of the particles dispersed in the composition.
The particles before making the composition have an average particle size d ₅₀ in the mass-based particle size distribution according to the Coulter counter method. It may be an average particle diameter d ₅₀ obtained from a piece.

  As such ultra-high molecular weight polyethylene, a commercially available product can be used. For example, the “Hizex Million (registered trademark)” series, the “Mipperon (registered trademark)” series (both manufactured by Mitsui Chemicals, Inc.), etc. Can be mentioned.

  Only 1 type may be used for ultra high molecular weight polyethylene, and 2 or more types from which a viscosity average molecular weight and an average particle diameter differ may be mixed and used.

  Although there is no particular limitation, the vinyl chloride resin composition of the present invention is usually 0.1 to 100 parts by mass, preferably 3 to 80 parts by mass of such ultrahigh molecular weight polyethylene with respect to 100 parts by mass of the vinyl chloride resin. Parts, more preferably 15-80 parts by mass. When the content of the vinyl chloride resin is within the above range, the effects of the present invention, that is, the woody appearance and excellent heat resistance can be sufficiently obtained.

<Other ingredients>
In the vinyl chloride resin composition of the present invention, if necessary, other components other than the vinyl chloride resin and high molecular weight polyethylene may be contained within a range not impairing the object of the present invention.

  For example, the vinyl chloride resin composition of the present invention is generally known as a stabilizer, lubricant, processing aid, filler, impact resistance enhancer, ultraviolet absorber, colorant such as pigment or dye, plastic It may contain various known additives such as an agent, a heat improver, a foaming agent, an antioxidant, an antistatic agent, a fungicide, an antibacterial agent, a flame retardant, and a flame retardant aid. These additives are used so that the additive effect of each additive can be obtained within a range that does not impair the mechanical properties and moldability of the obtained molded article.

Specifically, the stabilizer is a metal soap mainly composed of inorganic salts such as tribasic lead sulfate, lead silicate and basic lead carbonate, and organic acid salts of metals such as lead, cadmium, barium, calcium and zinc. , Those containing at least two of the above-mentioned metals, for example, Ba-Zn, Ca-Zn, Cd-Ba, etc. Although 1 type (s) or 2 or more types, such as soap and an organic tin type compound, are mentioned, it is not limited to these.
When a stabilizer is blended in the vinyl chloride resin composition of the present invention, the blending amount of the stabilizer is 0.1 to 30 parts by mass, particularly 1 to 15 parts by mass with respect to 100 parts by mass of the vinyl chloride resin. It is preferable.

As the flame retardant, one or more of antimony trioxide, barium borate, zinc borate, zinc oxide, chlorinated polyethylene, and other halogen flame retardants are used.
When a flame retardant is blended in the vinyl chloride resin composition of the present invention, the blending amount of the flame retardant is 1 to 30 parts by mass, particularly 1 to 15 parts by mass with respect to 100 parts by mass of the vinyl chloride resin. preferable.

  Furthermore, a filler can be added to the vinyl chloride resin composition of the present invention. In addition to ensuring the rigidity of the resin member, the addition of a filler contributes to the capture of volatile components generated from the material and the cost reduction of the material itself. Examples of the filler include, but are not limited to, carbon black, calcium carbonate, titanium oxide, talc, aluminum hydroxide, magnesium hydroxide, hydrotalcite, clay, silica, and white carbon. These fillers may be used alone or in combination of two or more. Carbon black also functions as a black pigment.

  When a filler is blended in the vinyl chloride resin composition of the present invention, the blending amount of the filler is 1 to 100 parts by mass, particularly 5 to 50 parts by mass with respect to 100 parts by mass of the vinyl chloride resin. preferable. If the blending amount of the filler is too small, the above-described addition effect tends to be insufficient, and if it is too much, the mechanical properties and moldability tend to be impaired.

  As the impact resistance enhancer, one or more known rubber polymers such as a butadiene rubber polymer, a silicone rubber polymer, and an acrylic rubber polymer can be used.

  The glass transition temperature (hereinafter sometimes referred to as “Tg”) of the rubber-like polymer used as the impact resistance enhancer is usually 0 ° C. or less, preferably from the viewpoint of imparting more excellent impact resistance. It is -10 degrees C or less, More preferably, it is -30 degrees C or less. When there are a plurality of glass transition temperatures, it is preferable that at least one glass transition temperature is not more than the above upper limit, and it is particularly preferable that all glass transition temperatures are not more than the above upper limit. These rubbery polymers are preferably obtained by emulsion polymerization.

The glass transition temperature of the rubbery polymer is the temperature at the peak top of the tan δ curve measured with a dynamic mechanical property analyzer, and is specifically measured as follows.
A rubber polymer powder was prepared into a test piece of 3 mm (thickness) × 10 mm (width) × 50 mm (length) by a hot press machine, and a dynamic mechanical characteristic analyzer (model name “EXSTAR DMS6100”, The tan δ curve is measured under the conditions of a double-end bending mode, a heating rate of 2 ° C./min, and a frequency of 10 Hz, and the temperature at the peak top of the tan δ curve is defined as the glass transition temperature.

The butadiene-based rubbery polymer is obtained by polymerizing 50 to 100% by mass of 1,3-butadiene and 0 to 50% by mass of one or more vinyl monomers copolymerizable with 1,3-butadiene. Those are preferred. By using such a butadiene rubber polymer, the impact resistance of the vinyl chloride resin composition can be greatly improved. Examples of vinyl monomers copolymerizable with 1,3-butadiene include aromatic vinyl monomers such as styrene and α-methylstyrene; alkyl (meta) such as methyl (meth) acrylate and ethyl (meth) acrylate. ) Acrylate; (meth) acrylonitrile. These may be used alone or in combination of two or more. Furthermore, polyfunctional aromatic vinyl monomers such as divinylbenzene and divinyltoluene; poly (meth) acrylates of polyhydric alcohols such as ethylene glycol di (meth) acrylate and 1,3-butanediol di (meth) acrylate; Allyl (meth) acrylate can also be used in combination.
In the present invention, (meth) acrylate means acrylate or methacrylate, and (meth) acryl means acryl or methacryl.

  Examples of silicone rubber polymers include polyorganosiloxane rubber and silicone / acrylic composite rubber in which polyorganosiloxane rubber and acrylic rubber are combined, but the impact resistance of vinyl chloride resin composition is improved. From this point of view, it is preferable to use a silicone / acrylic composite rubber. In the silicone / acrylic composite rubber, the polyorganosiloxane rubber component is preferably 1 to 99% by mass and the acrylic rubber component is 99 to 1% by mass (the total of both components is 100% by mass).

  As a method for producing a silicone / acrylic composite rubber, first, a latex of a polyorganosiloxane rubber is prepared by emulsion polymerization, and then the latex particles of the polyorganosiloxane rubber are impregnated with a monomer constituting the acrylic rubber. A method of polymerizing this is preferred. Examples of the monomer constituting the acrylic rubber include alkyl (meta) such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. ) Acrylates.

As the acrylic rubbery polymer, those obtained by polymerizing (meth) acrylate or a mixture containing (meth) acrylate as a main component are preferable. Examples of (meth) acrylates include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, and tridecyl (meth) ) Acrylate, ethoxyethyl (meth) acrylate, methoxytripropylene glycol (meth) acrylate, 4-hydroxybutyl (meth) acrylate, lauryl (meth) acrylate, and stearyl (meth) acrylate. These may be used alone or in combination of two or more.

  The acrylic rubbery polymer preferably has a Tg of 0 ° C. or less from the viewpoint of the effect of improving the impact resistance of the vinyl chloride resin composition. To obtain an acrylic rubbery polymer having a Tg of 0 ° C. or lower, n-butyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, lauryl (meth) acrylate, or tridecyl (meth) acrylate is used as (meth) acrylate. It is preferable.

  The acrylic rubbery polymer may be a (co) polymer obtained by polymerizing one or more monomers. Further, it may be an acrylic composite rubber in which two or more kinds of acrylic rubber polymers are combined.

  Of the above rubber polymers, a butadiene rubber polymer and a silicone rubber polymer are preferable because a high effect can be exhibited in low temperature impact strength, and a butadiene rubber polymer weight is particularly preferable. It is a coalescence.

  When the impact strength enhancer is blended with the vinyl chloride resin composition of the present invention, the blend amount of the impact strength enhancer is 2 to 50 parts by weight, particularly 3 to 10 parts per 100 parts by weight of the vinyl chloride resin. It is preferable to set it as a mass part.

<Method for producing vinyl chloride resin composition>
The vinyl chloride resin composition of the present invention is charged with a vinyl chloride resin, an ultrahigh molecular weight polyethylene having a viscosity average molecular weight of 1 million or more, and various other additives used as required in a predetermined kneader or mixer. And it can manufacture easily by mixing or knead | mixing uniformly, heating to the temperature range which is not deteriorated, for example, 100-230 degreeC, Preferably it is 130-200 degreeC. The vinyl chloride resin may be mixed with the high molecular weight polyethylene in advance, and then mixed with other various additives, or all components may be mixed at once, and any method may be used. . The mixer or kneader used for mixing or kneading the above-described blending components is not particularly limited as long as it is a device capable of substantially uniformly blending and kneading the blend.

  Examples of the mixer include a mixer such as a Henschel mixer, a ribbon blender, a planetary mixer, and a universal mixer. Examples of the kneader include a single screw extruder, a twin screw extruder, and an open roll. An apparatus capable of kneading under a shearing force while heating, such as a Banbury mixer, a kneader, a pressure kneader, or an intensive mixer, is used.

  When melt-kneading the raw material component of the vinyl chloride resin composition to granulate pellets, it is preferable to heat-knead at a temperature of about 130 to 190 ° C, for example.

[Extruded products for window frames]
By extruding the vinyl chloride resin composition of the present invention, an extruded product for a window frame can be produced. As the window frame extrusion molded product, only the vinyl chloride resin composition of the present invention is used, and even a single layer extrusion molded product obtained by extrusion molding as it is, on a base material made of a thermoplastic resin, Co-extrusion molding may be performed so that the skin layer made of the vinyl chloride resin composition of the present invention is laminated and coated. The skin layer made of the vinyl chloride resin composition of the present invention may be formed by being laminated and integrated on a base material made of a thermoplastic resin.

  However, a skin layer made of the vinyl chloride resin composition of the present invention is formed on a base material made of a thermoplastic resin rather than a single layer molded product obtained by extruding the vinyl chloride resin composition of the present invention as it is. A multilayer molded product obtained by extrusion molding so as to be laminated and coated is more preferable because a molded product having a high impact strength is obtained.

In this case, the thermoplastic resin constituting the base material of the multilayer extrusion molded product may be one or more of vinyl chloride resin, chlorinated polyethylene, polystyrene, polypropylene, ABS, AES, etc. A vinyl chloride resin having a high affinity with the vinyl chloride resin composition of the layer is preferable, and a vinyl chloride resin other than the vinyl chloride resin composition defined in the present invention is particularly preferable.
In addition, it is preferable that the thickness of the skin layer which consists of a vinyl chloride-type resin composition of this invention is about 0.05-1 mm.

The temperature at the time of extrusion molding is preferably in the range of a cylinder temperature of 130 to 180 ° C and a die temperature of 150 to 200 ° C.
If the temperature is lower than the above lower limit, molding is performed in a state where the resin cannot be sufficiently melted, and the designability and moldability tend to deteriorate. On the other hand, when it is higher than the above upper limit value, the resin component tends to be easily decomposed.

[Center line average roughness Ra]
The surface of the extruded product obtained by the vinyl chloride resin composition of the present invention has a center line average roughness Ra of preferably 0.5 μm or more, more preferably 1 to 80 μm, and still more preferably 5 to 20 μm. However, it is preferable from the viewpoint of obtaining a wood texture very similar to natural wood.
In the present invention, for example, the center line average roughness Ra can be controlled within the above range by adjusting the particle size and blending amount of the ultrahigh molecular weight polyethylene blended in the vinyl chloride resin composition.
In addition, the measuring method of centerline average roughness Ra is as describing in the term of the below-mentioned Example.

[Window frame]
The extruded product for window frames of the present invention is an extruded product excellent in woody design and also excellent in heat resistance, and is therefore suitable as a window frame for houses.

  EXAMPLES Hereinafter, although the content of this invention is demonstrated more concretely using an Example, this invention is not limited by a following example, unless the summary is exceeded. The values of various production conditions and evaluation results in the following examples have meanings as preferred values of the upper limit or lower limit in the embodiments of the present invention, and preferred ranges are the above-described upper limit or lower limit values and the following values: It may be a range defined by a combination of values of the examples or values of the examples.

<Raw material>
PVC: Vinyl chloride resin having an average degree of polymerization of 800 (cross-linked gel content: 0% by mass)
Ultra high molecular weight PE-1: Ultra high molecular weight polyethylene “Miperon (registered trademark) PM-200” manufactured by Mitsui Chemicals, Inc. (viscosity average molecular weight 1.8 million, average particle size 10 μm, melting point 136 ° C.)
Ultra high molecular weight PE-2: Ultra high molecular weight polyethylene “Miperon (registered trademark) XM-220” manufactured by Mitsui Chemicals, Inc. (viscosity average molecular weight 2 million, average particle size 30 μm, melting point 136 ° C.)
Cross-linked PVC: Cross-linked vinyl chloride resin low molecular weight PE with an average degree of polymerization of 1100 and a cross-linked gel content of 80% by weight: Polyethylene “High Wax (registered trademark)” (viscosity average molecular weight 2000) manufactured by Mitsui Chemicals

<Other ingredients>
Stabilizer: Stabilizer for Ca-Zn-based PVC Filler: Light calcium carbonate Impact resistance enhancer: Butadiene-based rubbery polymer (Tg = -66 ° C)
Pigment: Carbon black

<Evaluation method>
Centerline average surface roughness (Ra): Measured in accordance with JIS B0601 “Product Geometric Specification (GPS) —Surface Properties: Contour Curve Method—Terms, Definitions, and Surface Property Parameters”.

Wood texture: The wood texture was judged visually and evaluated according to the following criteria.
× = No wood texture △ = Slight wood texture ○ = With wood texture

Heat resistance: Measured according to JIS K7206 “Plastics—Thermoplastics—Vicat softening temperature test method”. This heat resistant temperature is preferably 90 ° C. or higher.

Pellet granulation: Whether or not pellet granulation was carried out when a mixture of blended raw materials was granulated using a φ40 mm single screw extruder (cylinder temperature: 140 to 160 ° C., die temperature: 160 ° C.) was determined as follows.
× = No granulation ○ = Granulation possible

[Examples 1 to 4 and Comparative Examples 1 to 4]
The blending raw materials shown in Table-1 were charged into a high-speed mixer with the blending amounts described in Table-1, and stirred until the temperature reached 100 ° C.
In addition, about the other component, it mix | blended so that it might become a total of 20 mass parts by 4 mass parts of stabilizers, 10 mass parts of fillers, 5 mass parts of impact-resistant reinforcement agents, and 1 mass part of pigments.
The discharged mixture was granulated into a pellet shape using a φ40 mm single screw extruder (cylinder temperature: 140 to 160 ° C., die temperature: 160 ° C.).
Among the evaluation items shown in Table 1, in the evaluation of pellet granulation, the granulated product at this time was used as an evaluation sample.
Among the evaluation items shown in Table 1, in the evaluation of heat resistance, the pellets were kneaded with a mixing roll (surface temperature 180 to 190 ° C.) and formed into a sheet by a press molding machine (molding temperature 180 ° C., The sample was compression molded at a molding pressure of 200 kg / cm ² ) and used as a sample for evaluation.
Among the evaluation items shown in Table 1, in the evaluation of the center line average roughness Ra and the wood texture, the granulated pellets were subjected to a φ40 mm single screw extruder (cylinder temperature: 160 to 180 ° C., die temperature: 190 ° C.). A flat molded product having a width of 300 mm and a thickness of 1 mm was extruded and used as a sample for evaluation.
Each evaluation result is shown in Table-1.

As can be seen from Table 1, Examples 1 to 4 corresponding to the vinyl chloride resin composition of the present invention are excellent in wood texture and heat resistance, and in particular, Example 2 and Example including 50 parts by mass of ultrahigh molecular weight polyethylene. Example 4 is excellent in heat resistance.
On the other hand, since Comparative Example 1 does not contain a texture modifying component, the surface is smooth, there is no wood texture, and heat resistance is poor.
In Comparative Examples 2 and 3 in which crosslinked PVC is added to Comparative Example 1, the wood texture is improved, but the heat resistance does not change and is not sufficient.
In Comparative Example 4 in which the ultrahigh molecular weight polyethylene in Examples 1 and 3 was replaced with low molecular weight polyethylene, pellet granulation by a φ40 mm single screw extruder was not possible.

Claims (10)

  A vinyl chloride resin composition comprising a vinyl chloride resin and an ultrahigh molecular weight polyethylene having a viscosity average molecular weight of 1 million or more.   The vinyl chloride resin composition according to claim 1, comprising a vinyl chloride resin as a main component and 0.1 to 100 parts by mass of the ultrahigh molecular weight polyethylene with respect to 100 parts by mass of the vinyl chloride resin.   The vinyl chloride resin composition according to claim 1 or 2, wherein the ultra high molecular weight polyethylene has an average particle diameter of 1 to 200 µm.   The vinyl chloride resin composition according to any one of claims 1 to 3, wherein a center line average roughness Ra of the surface of the extruded product of the vinyl chloride resin composition is 0.5 µm or more.   The vinyl chloride resin composition according to any one of claims 1 to 4, which is used for a laminate as a skin material on an extruded product having a base material made of a thermoplastic resin.   The vinyl chloride resin composition according to any one of claims 1 to 5, which is a vinyl chloride resin composition for window frames.   An extruded product of the vinyl chloride resin composition according to any one of claims 1 to 6.   An extrusion molded article for a window frame comprising a base material made of a thermoplastic resin and a skin layer made of the vinyl chloride resin composition according to any one of claims 1 to 6 laminated on the base material. .   The extruded product for window frames according to claim 8, wherein the thermoplastic resin is a vinyl chloride resin.   A window frame comprising the extruded product for window frames according to claim 8 or 9.