JP2000007854A - Antistatic resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antistatic polypropylene resin composition capable of suppressing generation of a scattered gas at a high temperature such as molding and reducing troubles such as environmental pollution or molding defect without lowering an antistatic property or a slipping property. SOLUTION: This antistatic resin composition is obtained by compounding a polypropylene resin with (A) a glycerol fatty acid ester containing 40-80 wt.% of monoester and 20-50 wt.% of diester (the fatty acid composing the ester is a 12-22C saturated fatty acid) and (B) a mixture of alkyldiethanolamine and a fatty acid monoester of alkyldiethanolamine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic polypropylene resin composition which has an excellent antistatic effect, reduces the amount of scattered gas due to an antistatic agent at a high temperature, and has an excellent slip property.

[0002]

2. Description of the Related Art In a polypropylene molded article, especially a film, an internal kneading type antistatic agent, for example, monoglyceride stearate, is used for the purpose of preventing electrostatic damage such as prevention of stain adhesion and reduction of printing defects. And ester-type antistatic agents represented by (1) are widely used. However, when molding a resin to which such an ester type antistatic agent is added, exposure to a high temperature causes scattering of the antistatic agent, contaminating the environment, and degassing holes in blow molding and injection molding. Blockage causes troubles, molding failures, etc., which have a large effect.

In order to reduce scattered matters (smoke) at a high temperature, means for increasing the molecular weight of the ester type antistatic agent is generally used. However, as the molecular weight increases, an antistatic effect is obtained. It is difficult and not preferable.

Accordingly, an object of the present invention is to prevent the generation of scattered gas at a high temperature such as during molding without lowering the antistatic property and slipping property, and to reduce troubles such as environmental pollution and molding defects. An object of the present invention is to provide a functional polypropylene resin composition.

[0005]

Means for Solving the Problems The present invention is an antistatic resin composition comprising the following components (A) and (B) mixed with a polypropylene resin. (A) Glycerin fatty acid ester having a monoester content of 40 to 80% by weight and a diester content of 20 to 50% by weight (provided that the fatty acid constituting the ester is a saturated fatty acid having 12 to 22 carbon atoms) (B) Mixtures of alkyldiethanolamine and fatty acid monoesters of alkyldiethanolamine

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The glycerin fatty acid ester which is the component (A) of the present invention is an ester of glycerin and a saturated fatty acid having 12 to 22 carbon atoms and having a monoester content of 40 to 80.
% By weight and a diester content of 20 to 50% by weight. If the content of the monoester exceeds 80% by weight, the smoke-producing property increases, and if it is less than 40% by weight, the manifestation of the antistatic effect is poor. If the diester content is also less than 20% by weight, the smoke-producing property becomes large, and if it exceeds 50% by weight, the manifestation of the antistatic effect becomes poor. The saturated fatty acids having 12 to 22 carbon atoms constituting the ester may be used alone or as a mixed fatty acid.

The alkyldiethanolamine constituting the component (B) of the present invention is preferably a compound represented by formula (I), and the fatty acid monoester of alkyldiethanolamine is preferably a compound represented by formula (II). .

[0008]

Embedded image

(In the formula, R ¹ represents an alkyl group having 12 to 22 carbon atoms.)

[0010]

Embedded image

(Wherein, R ² represents an alkyl group having 12 to 22 carbon atoms, and R ³ represents an alkyl group having 11 to 21 carbon atoms.) The alkyl diethanolamine and the fatty acid mono-alkyl diethanolamine in the component (B) are used. The weight ratio with the ester is
It is preferably at least 40/60 from the viewpoint of antistatic properties, and is preferably at most 60/40 in order to obtain good slip properties.

The alkyl chain length of the alkyldiethanolamine in the component (B) and the alkyldiethanolamine used as the raw material of the fatty acid monoester of the alkyldiethanolamine may be the same or different.

In order to achieve a good antistatic effect and a low smoke-generating property, the amount of the component (A) and the component (A) in the resin composition of the present invention must be in proportion to the polypropylene resin. 0.2
1.01.0% by weight and the component (B) 0.2 to 1.0% by weight are preferred.

The polypropylene resin to which the present invention is applied may have any structure as long as it is mainly composed of propylene, such as a homopolymer of propylene or a random or block copolymer of propylene and ethylene.
A good antistatic effect can be exhibited. The melt index is preferably between 0.1 and 20.

In the antistatic resin composition of the present invention, in addition to the above components (A) and (B), other resin additives can be used in combination as long as the effects of the present invention are not impaired. For example, polyoxyethylene aliphatic alcohol, polyoxyethylene alkyl phenyl ether, dihydroxyethyl alkyl amide, polyoxyethylene alkyl amide,
Surfactants such as alkyl sulfonates, erucamide, oleic amide, polyethylene wax, oxidized polyethylene wax, lubricants such as higher alcohols,
2,6-di-t-butyl-4-methylphenol, n-
Octadecyl-3- (3 ', 5'-di-t-butyl-
4'-hydroxyphenyl) propionate, pentaerythrityltetrakis- [methylene-3- (3 ', 5'-
Di-tert-butyl-4-hydroxyphenyl) propionate], dilauryl-3,3'-thiodipropionate, distearyl-3,3'-thiodipropionate,
Antioxidants such as trisnonylphenyl phosphite, bis- (2,2,6,6-tetramethyl-4-piperidyl) sebacate, [dimethyl-1- (2-hydroxyethyl) -4-hydroxy-2 succinate] 2,2,6,6-tetramethylpiperidine] condensate and the like;
UV absorbers such as (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole; nucleating agents such as dibenzylidenesorbitol; plasticizers; light stabilizers; And other additives, and other antistatic agents and the like may be used in combination.

The resin composition of the present invention can be formed into any molded articles such as films, sheets, bottles, filaments and the like.

[0017]

EXAMPLES In the following examples, parts and percentages are by weight unless otherwise specified.

Examples 1 to 10 and Comparative Examples 1 to 8 As components (A), (A-1) to (A-5) shown in Table 1 and (B) as components (B-1) shown in Table 2 ) To (B-7), 100 parts of a propylene polymer (F-122V manufactured by Grand Polymer Co., Ltd.) was added in the amount shown in Table 3, and pentaerythrityltetrakis- [ Methylene-3- (3 ′,
0.1 part of 5'-di-t-butyl-4-hydroxyphenyl) propionate and 0.05 part of calcium stearate were blended, mixed by a tumbler, and pelletized by a twin screw extruder adjusted to 210 ° C. Next, a film having a thickness of 100 μm was formed from the pellet by a T-die film forming apparatus adjusted to 280 ° C. to obtain a sample. Using this sample, the surface resistivity and the kinetic friction coefficient were measured by the following methods, and the smoke emission was evaluated. Table 3 shows the results.

[0019]

[Table 1]

[0020]

[Table 2]

<Measurement Method of Surface Specific Resistance> A film molded to 100 microns is stored in a room at a temperature of 25 ° C. and a humidity of 50% RH for 7 days, and then a high resistance meter A-3941 manufactured by Yokogawa Hewlett-Packard Company. Was used to measure the surface specific resistance (Ω).

<Measurement Method of Dynamic Friction Coefficient> A film molded to 100 μm is stored in a room at 23 ° C. for 7 days, and then subjected to JIS K-
The dynamic friction coefficient was measured according to 7125.

<Evaluation Method of Smoke Producing Property> At the time of forming a film with a T-die at 280 ° C., the evaluation of smoking was visually performed. When no smoke was visible, the evaluation was ◎. When the smoke was little and slightly visible, the evaluation was ○. When white smoke was confirmed, the evaluation was ×.

[0024]

[Table 3]

If the specific surface resistance value is less than 1 × 10 ¹³ Ω, there is no practical problem. The lower the dynamic friction coefficient, the better the slip property. From Table 3, it is clear that Examples 1 to 10 all have a small surface specific resistance value, are excellent in antistatic properties, show good slip properties, and have high anti-smoking properties. On the other hand, Comparative Examples 1 to 8 clearly show that the antistatic property, the slip property and the smoke preventing property cannot all be satisfied at the same time from the evaluation results of the surface specific resistance value, the coefficient of dynamic friction, and the smoke generating property.

[0026]

By adding the antistatic resin composition of the present invention to a polypropylene resin, it is possible to achieve smoke prevention during molding without lowering the antistatic effect and slipping property, and to improve the working environment. it can.

Claims (4)

[Claims] An antistatic resin composition comprising a polypropylene resin and the following components (A) and (B). (A) Glycerin fatty acid ester having a monoester content of 40 to 80% by weight and a diester content of 20 to 50% by weight (provided that the fatty acid constituting the ester is a saturated fatty acid having 12 to 22 carbon atoms) (B) Mixtures of alkyldiethanolamine and fatty acid monoesters of alkyldiethanolamine 2. The antistatic resin composition according to claim 1, wherein the weight ratio of the alkyldiethanolamine to the fatty acid monoester of the alkyldiethanolamine in the component (B) is from 40/60 to 60/40. 3. The antistatic property according to claim 1, wherein the alkyldiethanolamine is a compound represented by the general formula (I), and the fatty acid monoester of the alkyldiethanolamine is a compound represented by the general formula (II). Resin composition. Embedded image (In the formula, R ¹ represents an alkyl group having 12 to 22 carbon atoms.) (In the formula, R ² represents an alkyl group having 12 to 22 carbon atoms, and R ³ represents an alkyl group having 11 to 21 carbon atoms.) 4. The amount of the component (A) to the polypropylene resin is 0.2 to 1.0% by weight, and the amount of the component (B) is 0.2 to 1.0% by weight.
The antistatic resin composition according to any one of claims 1 to 3, which is 1.0% by weight.