阅读说明：本技术 一种注塑用脱模剂 (Mold release agent for injection molding ) 是由 刘为峰 于 2019-11-21 设计创作，主要内容包括：本发明涉及注塑领域,具体公开了一种注塑用脱模剂及其制备方法。该注塑用脱模剂,包括：大豆卵磷脂、异丙醇、聚乙二醇、二甲基硅油、聚山梨醇酯、单硬脂酸山梨坦、硬脂酸、二甲基乙醇胺、含氟聚合物、交联剂和石油醚等组分,通过三步法混合制得。本发明所述的注塑用脱模剂,在模具上喷涂一次后可进行多次脱模,并且该脱模剂对喷涂工艺的要求较低,即使喷涂不均匀,仍能形成相对均匀的保护膜。本发明所述的注塑用脱模剂的制备方法,工艺流程简单,操作方便,成本较低。(The invention relates to the field of injection molding, and particularly discloses a mold release agent for injection molding and a preparation method thereof. The mold release agent for injection molding comprises: soybean lecithin, isopropanol, polyethylene glycol, dimethyl silicone oil, polysorbate, sorbitan monostearate, stearic acid, dimethylethanolamine, fluoropolymer, a cross-linking agent, petroleum ether and the like, and the composite material is prepared by mixing the components in a three-step method. The release agent for injection molding can be used for demolding for multiple times after being sprayed on a mold once, has low requirement on a spraying process, and can form a relatively uniform protective film even if the spraying is not uniform. The preparation method of the release agent for injection molding has the advantages of simple process flow, convenient operation and lower cost.)

1. A mold release agent for injection molding, characterized in that: comprises the following components by weight:

1-2 parts of soybean lecithin

1-10 parts of isopropanol

5-8 parts of polyethylene glycol

3-5 parts of dimethyl silicone oil

2-3 parts of polysorbate

0.3-0.6 part of sorbitan monostearate

Stearic acid 5-12 parts

1-2 parts of dimethylethanolamine

0.2 to 0.6 portion of fluorine-containing polymer

2-3 parts of cross-linking agent

60-80 parts of petroleum ether.

2. The release agent for injection molding according to claim 1, characterized in that: comprises the following components by weight:

2 portions of soybean lecithin

5 portions of isopropanol

5 portions of polyethylene glycol

Dimethyl silicone oil 4 parts

Polysorbate 2 parts

Sorbitan monostearate 0.4 part

Stearic acid 8 parts

2 parts of dimethylethanolamine

0.6 part of fluorine-containing polymer

3 portions of cross-linking agent

And 68 parts of petroleum ether.

3. The release agent for injection molding according to claim 1 or 2, characterized in that: the fluorine-containing polymer is perfluorohexylethyl acrylate polymer F22.

4. A mold release agent for injection molding according to claim 3, characterized in that: the cross-linking agent is tetrabutyl titanate.

5. A mold release agent for injection molding according to claim 3, characterized in that: the cross-linking agent is isopropyl titanate.

6. A mold release agent for injection molding according to claim 3, characterized in that: the number average molecular weight of the polyethylene glycol is 1200-1500.

7. A mold release agent for injection molding according to claim 3, characterized in that: the viscosity of the release agent for injection molding is 90-115 mPa.s.

8. A method of producing a release agent for injection molding according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:

s1: adding isopropanol, polyethylene glycol, stearic acid, fluoropolymer and 1/3 petroleum ether into a mixing tank, and uniformly mixing to obtain a mixture A;

s2: adding soybean lecithin, simethicone, polysorbate, sorbitan monostearate, dimethylethanolamine, a cross-linking agent and the rest 2/3 petroleum ether into a mixing tank, and uniformly mixing to obtain a mixture B;

s3: and uniformly mixing the mixture A and the mixture B in a mixing tank to obtain the release agent for injection molding.

9. A method for producing a release agent for injection molding according to claim 8, characterized in that: in step S1, ultrasonic oscillation is used for mixing.

10. A method for producing a release agent for injection molding according to claim 8, characterized in that: in steps S2 and S3, mechanical stirring is used for mixing.

Technical Field

The invention belongs to the technical field of injection molding and demolding, and particularly relates to a demolding agent for injection molding.

Background

In the injection molding process, after products such as plastics, metals and the like are solidified in a mold, the surface of the mold cannot be absolutely smooth, so that a certain friction resistance exists when the product is stripped from the mold, and on the other hand, the product and the mold are difficult to demould due to physical adsorption or chemical bonding. In order to weaken the viscous action between the product and the mould and facilitate demoulding, a mould release agent is required. However, the existing release agents need to be re-sprayed after each release of 1 to 2 times, and the requirements for the spraying process are generally high.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the defects in the prior art, the invention provides a release agent for injection molding and a preparation method thereof.

The technical scheme is as follows: in order to achieve the above object, the present invention provides a mold release agent for injection molding, comprising by weight:

1-2 parts of soybean lecithin

1-10 parts of isopropanol

5-8 parts of polyethylene glycol

3-5 parts of dimethyl silicone oil

2-3 parts of polysorbate

0.3-0.6 part of sorbitan monostearate

Stearic acid 5-12 parts

1-2 parts of dimethylethanolamine

0.2 to 0.6 portion of fluorine-containing polymer

2-3 parts of cross-linking agent

60-80 parts of petroleum ether.

Preferably, the release agent for injection molding comprises the following components by weight:

2 portions of soybean lecithin

5 portions of isopropanol

5 portions of polyethylene glycol

Dimethyl silicone oil 4 parts

Polysorbate 2 parts

Sorbitan monostearate 0.4 part

Stearic acid 8 parts

2 parts of dimethylethanolamine

0.6 part of fluorine-containing polymer

3 portions of cross-linking agent

And 68 parts of petroleum ether.

Preferably, in the above-mentioned mold release agent for injection molding, the fluorine-containing polymer is perfluorohexylethyl acrylate polymer F22.

Preferably, in the above release agent for injection molding, the crosslinking agent is tetrabutyl titanate or isopropyl titanate.

Preferably, in the release agent for injection molding, the number average molecular weight of the polyethylene glycol is 1200-1500.

Preferably, the viscosity of the release agent for injection molding is 90 to 115 mpa.s.

Further, the preparation method of the release agent for injection molding comprises the following steps:

s1: adding isopropanol, polyethylene glycol, stearic acid, fluoropolymer and 1/3 petroleum ether into a mixing tank, and uniformly mixing to obtain a mixture A;

s2: adding soybean lecithin, simethicone, polysorbate, sorbitan monostearate, dimethylethanolamine, a cross-linking agent and the rest 2/3 petroleum ether into a mixing tank, and uniformly mixing to obtain a mixture B;

s3: and uniformly mixing the mixture A and the mixture B in a mixing tank to obtain the release agent for injection molding.

Preferably, in the above preparation method of the release agent for injection molding, in step S1, ultrasonic oscillation is used for mixing.

Preferably, in the above-mentioned method for producing a mold release agent for injection molding, steps S2 and S3, mixing is performed using mechanical stirring.

The release agent for injection molding only needs to be sprayed on the surface of a mold when in use, and a uniform protective film is automatically formed on the surface of the mold by the release agent for injection molding due to the arrangement of the special surfactant, so that a spraying device with very fine control is not needed. The fluorine-containing polymer F22 is very weak in hydrophilicity and lipophilicity, so that the bonding force between a product and a mold is effectively reduced, and meanwhile, the dispersion performance and the film-forming performance of polyethylene glycol are relatively balanced, so that a uniform and stable isolation film can be formed.

In conclusion, the beneficial effects of the invention are as follows: compared with the prior art, the release agent for injection molding can be used for demolding for multiple times after being sprayed on a mold once, and has low requirement on a spraying process, so that a relatively uniform protective film can be formed even if the spraying is not uniform. The preparation method of the release agent for injection molding has the advantages of simple process flow, convenient operation and lower cost.

Detailed Description

The invention will be further illustrated by the following specific examples, which are given for the purpose of illustration only and are not intended to be limiting.