JPH08183863A - Coloring agent for polyvinyl chloride - Google Patents

Abstract

PURPOSE: To control or prevent the plate-out of, e.g. an inorganic compound during molding an polyvinyl chloride article. CONSTITUTION: A coloring agent for polyvinyl chloride resin, which contains an inorganic compound treated with a silane coupling agent having an amino or epoxy group and containing a terminal alkoxy group. It can reduce a plate- out, such as an inorganic compound, occurring on the inner wall at the tip of the die of, e.g. an extruder during molding, makes it possible to perform continuous operation for a long time without stopping a molding machine for cleaning, and can greatly reduce the occurrence of mars on a molded article and also improve the gloss thereof.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel colorant for coloring polyvinyl chloride.

2. Description of the Related Art Conventionally, when a polyvinyl chloride is profile-extruded or injection-molded, a plate-out (build-up) occurs on the inner surface of the molding machine, which may damage the molded product or reduce the product size. There is a problem of having an adverse effect. Inorganic compounds such as titanium oxide and calcium carbonate in polyvinyl chloride, lubricants, gel polyvinyl chloride resins, etc. are ejected from the molded product at the part where the rapid flow of polyvinyl chloride changes during molding. Plate-out, which is a phenomenon of depositing on the inner surface of the molding machine, is particularly prominent during long-time molding during profile extrusion, and troubles easily occur. Polyvinyl chloride is composed of a polyvinyl chloride resin, a heat stabilizer, a lubricant, a filler, a plasticizer, and the like, and contains a colorant if necessary. In the case of plate-out caused by an inorganic compound such as titanium oxide contained in this colorant, an attempt to suppress / prevent plate-out by using organically treated titanium oxide with a polyol or siloxane has been investigated. It didn't come to a solution.

[0002]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The inventors of the present invention have made earnest studies on prevention of the plate-out of inorganic compounds such as titanium oxide as described above. The present invention has been completed by finding that treatment with a specific treatment agent can suppress or prevent plateout.

[0003]

That is, the present invention provides a coloring agent for polyvinyl chloride containing an inorganic compound, wherein the inorganic compound is treated with a terminal alkoxy-containing silane coupling agent having an amino group or an epoxy group. It is an agent.

The inorganic compound used in the present invention is an inorganic pigment such as titanium oxide, titanium yellow and iron oxide.

In the present invention, the silane coupling agent used for treating the inorganic compound is a terminal alkoxy-containing silane coupling agent having an amino group or an epoxy group. Among the terminal alkoxy-containing silane coupling agents, three reactive methoxy groups at one terminal,
Alternatively, a silane coupling agent containing three ethoxy groups and having a reactive amino group or epoxy group at the opposite terminal is particularly effective. These terminal alkoxy-containing silane coupling agents may be used alone or in combination of several kinds.

The amount of such a terminal alkoxy-containing silane coupling agent added is 0.5 to 3 parts by weight, more preferably 1 to 1.5 parts by weight, based on 100 parts by weight of the inorganic compound. If it is less than 0.5 part by weight, the effect of suppressing and preventing plate out is small, and if it exceeds 3 parts by weight, various performances of the polyvinyl chloride molded product may be affected.

The coloring agent of the present invention is intended to be colored with polyvinyl chloride. The polyvinyl chloride is a polyvinyl chloride resin, a heat stabilizer, a lubricant, a filler, a modifier, and It consists of a plasticizer.

As the polyvinyl chloride resin, conventionally known polyvinyl chloride, chlorinated polyethylene, vinyl chloride-
Examples thereof include a vinyl acetate copolymer, a vinyl chloride-vinyl vinyl chloride copolymer, a vinyl chloride-maleic acid ester copolymer, a vinyl chloride-acrylic acid ester copolymer, and a vinyl chloride-methacrylic acid ester copolymer.

As the heat stabilizer, a lead stabilizer (tribasic lead sulfate, basic lead sulfite, dibasic lead phosphite, dibasic lead phthalate, dibasic lead stearate, lead stearate) is used. Etc.), tin stabilizers (dioctyltin dilaurate type, dioctyltin maleate type, dioctyltin mercapto type, dimethyltin mercapto type, dibutyltin fatty acid type, dioctyl tin fatty acid type, di -Butyl tin maleate, di-butyl tin mercapto, etc.), Ca-Zn stabilizer, di-n-octyl tin maleate polymer, di-n-octyl tin bis (2-ethylhexyl malate) and epoxy And soybean oil.

Examples of the lubricant include higher fatty acid lubricants, wax lubricants, resin lubricants and fatty acid ester lubricants.

Examples of the filler include calcium carbonate and barium sulfate.

As the modifier, ethylene / vinyl acetate resin, polyethylene terephthalate, acrylic resin, M
BS polymer (methyl methacrylate-butadiene-styrene copolymer), ABS polymer, epoxy resin, chlorinated paraffin and the like can be mentioned.

Examples of the plasticizer include phthalic acid ester plasticizers, maleic acid / phthalic acid ester plasticizers, trimellitic acid ester plasticizers, polyester / epoxidized ester plasticizers, and fatty acid ester plasticizers. To be

The form of the colorant of the present invention includes masterbatch, powdery and granular dry colors, and the most effective form of the colorant for suppressing and preventing plate out is powdery and granular. It is a granular dry color.

The masterbatch of the present invention is prepared by melt-kneading a pigment containing a predetermined amount of an inorganic compound, polyvinyl chloride resin, a plasticizer, a heat stabilizer, a dispersant and the like with a silane coupling agent, and then pelletizing the mixture. It is a plate.

The powdery dry color is a powdery colorant composed of a pigment containing an inorganic compound, a dispersant and the like. The powdery dry color is a colorant of the present invention in which, when a pigment containing a predetermined amount of an inorganic compound and a dispersant are mixed, the terminal alkoxy-containing silane coupling agent is directly treated by a spraying method to slowly react. And

The granular dry color means a granular colorant including a pigment containing an inorganic compound, a polyvinyl chloride resin, a plasticizer, a stabilizer, a modifier, a dispersant, or a pigment and a dispersant containing an inorganic compound. It is a colorant consisting of only. The granular dry color is obtained by melt-kneading a pigment containing a predetermined amount of an inorganic compound, a polyvinyl chloride resin, a dispersant agent and the like together with a silane coupling agent to cause a reaction, and then granulating the colorant of the present invention.

Here, the dispersant is a metal salt of stearic acid, low-molecular-weight polyethylene or the like, and is for improving the pigment dispersion.

In addition to the components described above, various additives such as general lubricants, reinforcing agents and foaming agents are used as other components of the coloring agent for polyvinyl chloride within a range that does not impair the effects of the present invention. be able to.

[0020]

The present invention will be described in more detail with reference to Examples. Here, parts are parts by weight.

Example 1 100 parts of titanium oxide and 25 parts of calcium stearate were mixed with a stirrer, and then 1.0 part of γ-aminopropyltriethoxysilane was sprayed into this mixture to continue the reaction by reacting the present invention. Was obtained.

1.43 parts of the above colorant was added to 100 parts of polyvinyl chloride containing a lead-based stabilizer having the following formulation,
A Henschel mixer was used as a test sample.

Polyvinyl chloride straight PVC containing lead stabilizer (average degree of polymerization; p = 1000) 100 parts Tribasic lead sulfate 0.5 parts Dibasic lead stearate 0.5 parts Lead stearate 2. 0 parts Wax-based lubricant 0.5 parts Calcium carbonate 3.0 parts

A test sample mixed with a Henschel mixer was extruded for 1 hour under the following conditions, and the plate-out state inside the die was observed. The results shown in Table 1 were obtained. Extrusion conditions: φ = 20 mm, L / D = 20 single-screw extruder (screw shape; full flight), screen 40
Put one mesh, rotation speed 75rpm, temperature: 200
Extruded at ℃.

Example 2 100 parts of titanium oxide and 25 parts of calcium stearate were mixed with a stirrer, and then 3.0 parts of γ-aminopropyltriethoxysilane were sprayed and continuously mixed to react with the mixture of the present invention. Was obtained. Using this colorant, a test sample was obtained in the same manner as in Example 1. The results are shown in Table 1.

Example 3 100 parts of titanium oxide and 25 parts of calcium stearate were mixed with a stirrer, and 1.0 part of β- (3,4epoxycyclohexyl) ethyltrimethoxysilane was sprayed and allowed to react while being mixed. A colorant was obtained. Using this colorant, a test sample was obtained in the same manner as in Example 1. The results are shown in Table 1.

Example 4 100 parts of titanium oxide, 43 parts of low molecular weight polyethylene and 1.0 part of γ-aminopropyltriethoxysilane were uniformly mixed, and kneaded by heating with 3 rolls (120 ° C., 2 passes). A colorant of the present invention was obtained. For 100 parts of polyvinyl chloride containing the lead-based stabilizer described in Example 1, 1.7 parts of the above colorant was used.
Parts were added, and a test sample was obtained in the same manner as in Example 1 below. The results are shown in Table 1.

Comparative Example 1 100 parts of titanium oxide and 25 parts of calcium stearate were mixed with a stirrer to obtain a comparative colorant. Using this colorant, a test sample was obtained in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 2 100 parts of titanium oxide and 43 parts of low molecular weight polyethylene were uniformly mixed and kneaded by heating with three rolls to obtain a colorant of the present invention. Polyvinyl chloride containing lead stabilizer as described in Example 1 1
The test sample was obtained in the same manner as in Example 1 by adding 1.7 parts of the above colorant to 00 parts. The results are shown in Table 1.

Example 5 100 parts of titanium oxide and 25 parts of magnesium stearate were mixed with a stirrer, and then 1.0 part of γ-aminopropyltriethoxysilane was sprayed into this mixture and the mixture was reacted to cause reaction. Was obtained. 1.43 parts of the above colorant was added to 100 parts of polyvinyl chloride containing a tin-based stabilizer having the following formulation, and mixed with a Henschel mixer to prepare a test sample. Hereinafter, the same test as in Example 1 was performed. The results are shown in Table 1.

Polyvinyl chloride straight PVC containing tin stabilizer (p = 1000) 100 parts Dibutyltin mercapto 0.5 parts Magnesium stearate 0.8 parts Wax lubricant 1.0 parts

Comparative Example 3 100 parts of titanium oxide and 25 parts of magnesium stearate were mixed with a stirrer to obtain a comparative colorant. Using this colorant, a test sample was obtained in the same manner as in Example 5. Hereinafter, the same test as in Example 1 was performed. The results are shown in Table 1.

[0033]

[Table 1]

[0034]

When the coloring agent of the present invention obtained as described above is used as a coloring agent for polyvinyl chloride according to a conventionally known method, an inorganic compound is generated on the inner wall of the die tip of an extruder or the like during molding. It is possible to reduce plate-out items such as
It became possible to perform continuous work for a long time without stopping the molding machine for cleaning. Further, it was possible to significantly reduce the occurrence of scratches on the molded product.

Claims (2)

[Claims] 1. A colorant for an inorganic compound-containing polyvinyl chloride resin, wherein the inorganic compound is treated with a terminal alkoxy-containing silane coupling agent having an amino group or an epoxy group. 2. The colorant according to claim 1, wherein the terminal alkoxy-containing silane coupling agent is triethoxyaminosilane or trimethoxyepoxysilane.