JP2002275336A - Vinyl chloride resin composition, processing aid and method for controlling plate-out - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop an aid for controlling a plate-out phenomenon maintaining excellent lubricity in a system containing a less toxic organic tin stabilizer and a metallic soap stabilizer in a vinyl chloride resin composition. SOLUTION: This aid for controlling a plate-out phenomenon is obtained by compounding a glycerin-succinic acid-aliphatic acid ester having a free carboxylic acid into a vinyl chloride resin containing a stabilizer, an inorganic filler and a lubricant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin composition, a processing aid, and a method for suppressing plate-out. The present invention relates to a method for suppressing plate-out using an auxiliary agent and a vinyl chloride resin composition.

[0002]

2. Description of the Related Art Hard vinyl chloride resins are widely used for house building materials such as plumbing pipes and rain gutters and for civil engineering. This vinyl chloride resin is unstable to heat and light, decomposes while removing hydrogen chloride from the molecular chains constituting the vinyl chloride resin during processing or use, and the vinyl chloride resin product discolors, mechanically, optically, The electrical properties decrease. Stabilizers are used to improve these negative phenomena. Cadmium-barium-based, calcium-zinc-based, barium-
There are zinc-based, tin-based, lead-based and the like, but conventionally, lead-based stabilizers having better thermal stability, electrical insulation and workability than others have been most widely used.

However, lead-based stabilizers have been pointed out to be toxic in terms of working environment and use, and the elution of lead from polyvinyl chloride resin pipes for water supply has become a social problem. Can no longer be used. In addition, the use of lead-based stabilizers in vinyl chloride pipes for sewage is being regulated from the viewpoint of preventing the release of lead into the environment. For this reason, studies are being made to replace it with a more safe organotin-based stabilizer or a metal soap-based stabilizer such as calcium, zinc, and barium.

[0004] Since these stabilizers are inferior in processability to lead-based stabilizers, lubricants have been studied for the purpose of improving them. As such lubricants, for example, a method using pentaerythritol or dipentaerythritol or a higher fatty acid ester of a mixture thereof having an esterification rate of 75% or more (Japanese Patent Publication No. 55-17054), or A) a) aliphatic 0-6 hydroxyl groups or acids consisting of: alicyclic and / or aromatic dicarboxylic acids, b) aliphatic polyols and c) aliphatic monocarboxylic acids having 12 to 30 carbon atoms in the molecule. B) 1) dicarboxylic acid and 12 to
Ester comprising a long-chain aliphatic monofunctional alcohol having 30 carbon atoms, 2) a long-chain aliphatic monocarboxylic acid having 12 to 30 carbon atoms in a molecule and a molecule Ester comprising a long-chain aliphatic monofunctional alcohol having 12 to 30 carbon atoms therein; 3) an aliphatic polyol and a long chain having 12 to 30 carbon atoms in the molecule A method of using a specific amount of a mixed ester A) and an ester B in an ester consisting of a group of all- or partial esters composed of an aliphatic aliphatic monocarboxylic acid (Japanese Patent Publication No. 56-9544). I have.

On the other hand, in a vinyl chloride resin composition containing a non-lead-based stabilizer such as an inorganic filler and calcium stearate, a plate-out in a mold at the time of extrusion molding can be achieved only by blending a generally used lubricant. The plate-out material which has been generated and mainly adhered to the mold and has an inorganic filler as a main component must be removed frequently, and there has been a problem that productivity is reduced. In the lubricant composition disclosed in the above two publications, the lubricity at the time of extrusion was improved, but the plate-out was not sufficiently improved.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a vinyl chloride resin composition comprising a low-toxic organotin-based stabilizer and a metal soap-based stabilizer while maintaining excellent lubricity while maintaining excellent lubricity. It is an object of the present invention to develop a processing aid that suppresses or reduces the phenomenon.

[0007]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the above problems, and as a result, have found that a vinyl chloride resin composition comprising a stabilizer, an inorganic filler and a lubricant is provided. The present inventors have found that a plate-out phenomenon is prevented by blending a glycerin succinic acid fatty acid ester having a free carboxylic acid remaining in the molecule, thereby completing the present invention.

That is, the present invention has the following configuration. 1. A processing aid that suppresses or reduces plate-out during the molding of vinyl chloride resin composed of glycerin succinic acid fatty acid ester having a free carboxylic acid in the molecule. 2. A method for suppressing or reducing plate-out during molding of a vinyl chloride resin, which comprises mixing the processing aid according to the above 1 into a vinyl chloride resin composition containing a stabilizer, an inorganic filler and a lubricant.

3. A vinyl chloride resin composition containing a stabilizer, an inorganic filler and a lubricant, comprising the processing aid described in the above item 1, wherein the plate-out during molding is suppressed and reduced. object.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in more detail. As the vinyl chloride resin used in the present invention, for example, a monomeric polymer of vinyl chloride or ethylene, olefins such as propylene, vinyl esters such as vinyl acetate,
Examples thereof include a mixture with a copolymer such as a random polymer with an unsaturated carboxylic acid such as an acrylic ester or a methacrylic ester, or a mixture obtained by alloying a polymer having rubber elasticity mainly using these.

In the present invention, the glycerin succinic acid fatty acid ester having a free carboxylic acid in the molecule is a glycerin fatty acid ester obtained by a method such as an esterification reaction between glycerin and an aliphatic fatty acid or a transesterification reaction between glycerin and an oil or fat. (Mono-diglyceride) or an ester of glycerin aliphatic fatty acid monoester (monoglyceride) or glycerin aliphatic fatty acid diester (diglyceride) and succinic acid, which are separated by a method such as molecular distillation or chromatography. It is obtained by a method such as an esterification reaction between aliphatic fatty acid esters and succinic acid, or esterification of glycerin fatty acid esters with succinic anhydride.

The aliphatic fatty acids used in the glycerin succinic acid fatty acid ester include, for example, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid,
Carbon number of stearic acid, arachiic acid, eicosapentaenoic acid, behenic acid, lignoceric acid, cerotic acid, montanic acid, elaidic acid, erucic acid, oleic acid, linoleic acid, linoleic acid, ricinoleic acid, hydroxystearic acid or isostearic acid Examples thereof include natural or synthetic aliphatic fatty acids such as 8 to 50 saturated or unsaturated linear, branched, or hydroxy acids, and one or a mixture of two or more of these aliphatic fatty acids can be used. In addition, the glycerin succinic acid fatty acid ester obtained from these fatty acids can be used in a liquid state, but a solid ester can be more preferably used.

The amount of the glycerin succinate fatty acid ester having a free carboxylic acid in the molecule according to the present invention is as follows:
0.01 to 2.0% by mass, preferably 0.05 to 0.2% by mass, based on the vinyl chloride resin.

As the stabilizer used in the present invention, less toxic or non-toxic stabilizers such as organotin stabilizers and metal soaps such as calcium and zinc can be used. In the case of using a lead-based stabilizer, the amount of the lead-based stabilizer can be significantly reduced.

Various inorganic fillers can be used in the present invention. Examples thereof include calcium carbonate, clay, silica, carbon black, calcium silicate, and the like.
Diatomaceous earth, chalk, etc.

As the lubricant used in the present invention, a commonly used lubricant can be used. For example, higher fatty acids such as stearic acid and palmitic acid and derivatives thereof, metal soaps, natural waxes such as carnauba wax, canderia wax, synthetic waxes such as low-polymerized polyethylene wax, and petroleum-based waxes such as paraffin wax. There are waxes and the like. These lubricants may be one kind or a mixture of two or more kinds.

In the present invention, in addition to the above components, if necessary, additives such as a stabilizing aid, a pigment, an antistatic agent and a foaming agent can be appropriately compounded. Known additives can be used without any particular limitation.

[0018]

Hereinafter, the present invention will be described with reference to Examples.
Embodiments of the present invention are not limited to these. [Sample Glycerin Succinic Acid Fatty Acid Ester] According to a known method, an esterification reaction was performed with 1 mol equivalent of distilled monoglyceride and 1.3 mol equivalent of succinic anhydride to obtain a glycerin succinic fatty acid ester.

(1) Glycerin succinate palmitate Equivalent liquemar P as distilled palmitate monoglyceride
-100 (RIKEN Vitamin Co., Ltd.) was used.

(2) Glycerin succinate stearic acid ester Liquemar S as distilled stearic acid monoglyceride
-100 (RIKEN Vitamin Co., Ltd.) was used.

(3) Glycerin behenate succinate Lichemal B-1 as distilled behenate monoglyceride
00 (RIKEN Vitamin Co.) was used.

[Tests and Evaluations] The blended compositions of the examples and comparative examples shown in Table 1 were uniformly mixed, and a barrel temperature of 170 to 195 ° C. was obtained with a different direction twin screw extruder TP-20T manufactured by Thermoplastics Industry Co., Ltd. C1 = 170 ° C., C2 = 185
C, C3 = 195 ° C.), the mold temperature was 210 ° C., the screw rotation speed was 70 rpm, and the extruded amount was 2.5 kg / h. The results are shown in Table 1.

The following raw materials were used in the test.

Vinyl chloride resin: trade name "ZEST100"
0Z "(Shin Daiichi PVC Co.) Organotin stabilizer: Trade name" TVS # 8831 "(Nitto Kasei) Calcium carbonate: Trade name" Whiteton SB "(Shiraishi Calcium Co.) Calcium stearate: Trade name" Nissan Calcium " Stearate G "(Nippon Oil & Fats Co., Ltd.) Lubricant A: Trade name" RIQUESTER SL-02 "(RIKEN Vitamin Co .: ester wax) Lubricant B: Trade name" Hiwax 220MP "(Mitsui Petrochemical: Polyethylene wax)

The evaluation results of the test were based on the following criteria. ：: Deposition is hardly observed ×: Deposition is clearly observed

[0026]

[Table 1]

[0027]

According to the present invention, by blending a glycerin succinic acid fatty acid ester having a free carboxylic acid in the molecule of the present invention, plate-out during processing of a vinyl chloride resin composition is suppressed, and workability and productivity are remarkably improved.

Claims (3)

[Claims] 1. A processing aid for suppressing or reducing plate-out during molding of a vinyl chloride resin comprising a glycerin succinic acid fatty acid ester having a free carboxylic acid in the molecule. 2. A plate-out during molding of a vinyl chloride resin, characterized by incorporating the processing aid according to claim 1 into a vinyl chloride resin composition containing a stabilizer, an inorganic filler and a lubricant. How to control and reduce. 3. A vinyl chloride resin composition containing a stabilizer, an inorganic filler and a lubricant, comprising the processing aid according to claim 1, wherein plate-out during molding is suppressed or reduced. Vinyl chloride resin composition.