KR100966826B1 - Composition of release agent for molding - Google Patents

Abstract

The present invention relates to a mold release agent composition for a molding machine, and more particularly includes 5 to 15% by weight of synthetic hydrocarbon, 0.5 to 5.0% by weight emulsifier, 0.5 to 2.0% by weight wetting agent, 0.1 to 0.5% by weight of preservative and the remainder of distilled water. A release agent composition for a molding machine.

Description

Release agent composition for molding machine {Composition of release agent for molding}

The present invention relates to a mold release agent composition for a molding machine, and more particularly includes 5 to 15% by weight of synthetic hydrocarbon, 0.5 to 5.0% by weight emulsifier, 0.5 to 2.0% by weight wetting agent, 0.1 to 0.5% by weight of preservative and the remainder of distilled water. A release agent composition for a molding machine.

A release agent is a substance that removes the adhesiveness generated between the surfaces of two materials. The material adheres to or adheres to a mold such as a mold during press molding and injection molding of industrial products such as rubber, plastic, and resin. It is a formulation which prevents the process and processes the inside of a material and the surface of a metal mold | die in order to improve the drawability of a molded article, or to improve a surface aesthetics.

Currently, the domestic tire industry uses solvent-based mold release agents or imported aqueous mold release agents to increase product release from molds in the manufacturing process of tires produced by injection molding machines.Due to the small size of domestic release agent manufacturers, the development of new materials Or, there is almost no research on improvement of existing products.

Solvent-type release agents are used as a method of dissolving oil in an organic solvent and then releasing it into a mold, the method not only causes a health problem of the worker due to environmental pollution due to the volatility of the large amount of solvent contained in the release agent, There are disadvantages that can deteriorate the work environment and cause the fire and pollute the environment around the workplace.

Aqueous release agents have disadvantages such as poor dryness, poor wettability to molds due to water as a diluent, and poor precision due to the use of emulsifiers.However, organic solvents are increasingly used in workplaces as part of international efforts to prevent environmental pollution. As it is regulated, there is no toxicity of organic solvents and there is no risk of fire.

The present invention is free from solvents and silicone (silicon) to be toxic and water-free, to provide a mold release agent composition for the molding machine is environmentally friendly, not harmful to the human body, there is no risk of fire.

The present invention contains 5-15% by weight of synthetic hydrocarbon, 0.5-5.0% by weight of emulsifier, 0.5-2.0% by weight of wetting agent, 0.1-0.5% by weight of preservative and remainder of distilled water. It is intended to provide a release agent composition for a molding machine which is not harmful and does not pose a risk of fire.

The release agent composition for a molding machine according to the present invention has excellent lubricity and mold release property when forming a tire, and does not contain a solvent and silicon (silicon), which is toxic and water-free, which is environmentally friendly, not harmful to the human body, and does not have a risk of fire. I have it.

This invention shows the mold release agent composition for molding machines containing 5-15 weight% of synthetic hydrocarbons, 0.5-5.0 weight% of an emulsifier, 0.5-2.0 weight% of a wetting agent, 0.1-0.5 weight% of a preservative, and remainder distilled water.

When forming a tire, the unvulcanized compound tends to stick to the surface of the molding machine flange, and the green case after the molding is difficult to remove from the molding machine flange and may be damaged in severe cases. The damaged green case may cause inner irregularities, bead position defects, and may cause musculoskeletal disease of workers when excessive force is applied to remove the green case stuck to the molding machine flange.

Conventionally, cutting oil was used as a release agent when forming a tire, which caused bead toe cracking and uncured, and caused environmental pollution due to undrying.

The release agent should not harm the rubber during vulcanization and should not adversely affect the adhesion between the rubber and the rubber. And because it dries quickly, the release agent must be dry and harmless to the human body before the next spray process.

In addition, membranes made from release agents must be able to be used several times over a long period of time,

The release agent membrane should be very thin and have a low coefficient of friction. The release agent membrane should not compromise the appearance of the green case while reducing the downtime of the plant and at the same time reducing the cost.

 The synthetic hydrocarbon is a main component of the mold release agent composition for a molding machine according to the present invention, and has a function of lowering the coefficient of friction so that the green case is gently detached from the molding machine flange.

As an example of the synthetic hydrocarbon, at least one selected from the group consisting of hydrogenated 1-decene homopolymer, alkylbenzenes, cycloaliphatics, and polyalphaolefins (PAO, polyalphaolefin) may be used. Can be.

Alkylbenzene in the synthetic hydrocarbon may be an alkylbenzene containing an alkyl group having 1 to 10 carbon atoms.

 The release agent composition for a molding machine of the present invention may contain 5 to 15% by weight of the synthetic hydrocarbon, preferably 7 to 8% by weight, in which case the synthetic hydrocarbon is outside the content range of 5 to 15% by weight. Problems such as bead toe-galling miscellaneous due to damage or undried may occur.

The emulsifier contained in the release agent composition for a molding machine according to the present invention has a function of making two or more kinds of liquids which are not mixed with each other into a stable emulsion (emulsion).

The emulsifier is selected from the group consisting of cetyl alcohol, glycerol monostearate, polyoxyethylene fatty acid esters, dioctyl phthalate, epoxy resins. One or more may be used.

In the release agent composition for a molding machine of the present invention, the emulsifier may be contained in an amount of 0.5 to 5.0% by weight, preferably 1.0 to 1.5% by weight. It can affect and cause problems such as process defects (bead toe cracking, uncured).

In the mold release agent composition for a molding machine of the present invention, the humectant is a component that functions to absorb or preserve moisture.

As the wetting agent, one or more selected from the group consisting of amine compounds, polyethylene glycol, polyethylene dimethyl glycol, and propylene glycol may be used.

The release agent composition for a molding machine of the present invention may contain 0.5 to 2.0% by weight, preferably 1.0 to 1.5% by weight of the humectant, and when the humectant is out of the content range of 0.5 to 2.0% by weight, Problems such as unused oil, volatiles, etc. may occur.

The preservative in the mold release agent composition for a molding machine of the present invention has a function of preventing the corruption and deterioration of the mold release agent by the action of the microorganisms.

As the preservative, at least one selected from the group consisting of paraoxybenzoic acid ester and methylparaben may be used.

In the mold release agent composition for a molding machine of the present invention, the preservative may contain 0.1 to 0.5% by weight, preferably 0.2 to 0.4% by weight. When the preservative is out of the content range of 0.1 to 0.5% by weight, the decay of the mold release agent and Deterioration may occur and problems such as layer separation may occur.

Hereinafter, the present invention will be described in more detail with reference to the following examples and test examples, but these are not limited to the scope of the present invention by these examples as one embodiment of the present invention.

Example 1 Preparation of Mold Release Agent Composition for Molding Machine (1)

10% by weight of hydrogenated 1-dicene homopolymer with synthetic hydrocarbon, 2.5% by weight of polyoxyethylene fatty acid ester as emulsifier, 1.5% by weight of propylene glycol as wetting agent, and 0.3% by weight of paraoxybenzoic acid ester as preservative in a stirred tank, followed by purified water 85.7% by weight was added and stirred at 500 to 1000 rpm for 2 hours at 25 ° C to form a stable emulsion, which was cooled to 5 to 15 ° C to prepare a mold release agent composition for a molding machine.

In Table 1 below, the composition of the release agent composition of Example 1 is collectively shown.

Example 2 Preparation of Release Agent Composition for Molding Machine (2)

A release agent composition for a molding machine was prepared in the same manner as in Example 1 except that the content of the synthetic hydrocarbon was 5% by weight and the emulsifier was 90.7% by weight.

Example 3 Preparation of Release Agent Composition for Molding Machine (3)

A mold release agent composition for a molding machine was prepared in the same manner as in Example 1 except that alkylbenzene including an alkyl group having 2 carbon atoms was used as a synthetic hydrocarbon, and dioctyl phthalate was used as an emulsifier.

Example 4 Preparation of Mold Release Agent Composition for a Molding Machine (4)

A release agent composition for a molding machine was prepared in the same manner as in Example 3 except that the content of the synthetic hydrocarbon was 5% by weight and the emulsifier was 90.7% by weight.

Comparative Example Preparation of Release Agent Composition for Silicone Molding Machine

A release agent composition for a silicone-based molding machine was prepared in the same manner as in Example 1 except that polydimethylsiloxane was used instead of the synthetic hydrocarbon.

TABLE 1 Composition of the release agent compositions of Examples and Comparative Examples (unit: weight%)

ingredient Example 1 Example 2 Example 3 Example 4 Comparative example Synthetic hydrocarbons 10 5 10 5 - Polydimethylsiloxane - - - - 10 Emulsifier 2.5 2.5 2.5 2.5 2.5 Wetting agent 1.5 1.5 1.5 1.5 1.5 antiseptic 0.3 0.3 0.3 0.3 0.3 Purified water 85.7 90.7 85.7 90.7 85.7

Test Example 1 Measurement of Physical Properties of Mold Release Agent Composition

The results of measuring specific gravity, pH, and solids of the release agent composition for each molding machine prepared in the above example are shown in Table 2 below.

At this time, specific gravity was measured at 25 ℃, pH was measured using a pH meter, solid (solid) was measured for 2 hours at 105 ℃.

TABLE 2 Physical property measurement result

Test Items Example 1 Example 2 Example 3 Example 4 importance 1.0 1.05 1.0 1.05 pH 7.2 7.2 7.2 7.2 Solid content (%) 7 8 7 8

<Test Example 2> demolding effect of the green case

The release agent composition for a molding machine prepared in Examples 1 to 4 and Comparative Examples was applied to a tire molding machine, and the results of observing the number of demolding times of the green case by one application were visually shown in Table 3 below.

TABLE 3 Measurement result of demolding effect of green case

division Example 1 Example 2 Example 3 Example 4 Comparative example 1 repetition 8 8 8 8 7 2 repetitions 7 8 8 7 6 3 repetitions 8 8 7 8 6

As shown in Table 3, it can be seen that the number of times of demolding by one application of the release agent composition according to Examples 1 to 4 of the present invention is superior to that of the silicone-based release agent composition according to the comparative example.

Test Example 3 Interfacial Adhesion Test

After cutting two uncured rubber specimens into 1 cm X 5 cm size, each of the unvulcanized rubber specimens was coated with a mold release agent composition prepared in Example 1 and a release agent composition for a silicone-based molding machine of Comparative Example 5 g / m ² , respectively. Dried.

Overlapping the unvulcanized rubber specimens of the same size to which the release agent composition was applied to each of the unvulcanized rubber specimens to which each release agent composition was applied, followed by vulcanization at 150 ° C. for 10 minutes, followed by grasping both sides of the rubber specimen. The interfacial adhesion of the release agent composition of the example was tested and the results are shown in Table 4 below.

TABLE 4 Interfacial Adhesion Result

division Example 1 Comparative example Interfacial Adhesion 10kgf / cm ² 1kgf / cm ²

Test Example 4 Comparison of Cutting Oil and Example 1 Release Agent

The cutting oil used as a mold release agent for a conventional molding machine and the mold release agent composition for a molding machine of Example 1 of the present application are summarized in Table 5 below for characteristics such as dispersibility, odor, dryness, residue, corrosion, and harmfulness.

<Table 5> Property Properties

Item Existing Product Example 1 Dispersibility Flow down when applied to molding machine Does not flow down when applied to molding machine smell Bad smell Odorless Dryness Due to poor drying, coolant drops to the workshop during conveying the coated green case Fast drying, no contamination leftover Leftovers created No dregs corrosion Corrosion in the molding machine No corrosion on the molding machine Hazard Skin irritation No skin irritation

As shown in Table 5, it was found that the characteristics of the mold release agent composition for the molding machine of the present application are better than the cutting oil used as the release agent composition for the conventional molding machine.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the present invention described in the claims below. And can be changed.

The release agent composition for the molding machine of the present invention has excellent lubricity and mold release property when forming tires, and does not contain solvents and silicones, so it is free of toxic components and aqueous, and thus has the advantages of being environmentally friendly, not harmful to humans, and not causing fire. It can be used for tire related industries.

Claims (5)

5-15% by weight of synthetic hydrocarbons; 0.5 to 5.0 wt% emulsifier; 0.5 to 2.0% by weight of a wetting agent selected from the group consisting of amine compounds, polyethylene glycol, polyethylenedimethylglycol, and propylene glycol; 0.1 to 0.5 wt% preservative; And remainder of distilled water. The method of claim 1, wherein the synthetic hydrocarbon is selected from the group consisting of hydrogenated 1-decene homopolymers, alkylbenzenes, cycloaliphatics, poly alphaolefins (PAO, polyalphaolefin) Mold release agent composition for molding machines characterized by one or more types. The method of claim 1, wherein the emulsifier is cetyl alcohol, glycerol monostearate, polyoxyethylene fatty acid ester (polyoxyethylene fatty ester), dioctyl phthalate, epoxy resin Mold release agent composition for a molding machine, characterized in that at least one member selected from the group consisting of. delete The mold release agent composition for a molding machine according to claim 1, wherein the preservative is at least one selected from the group consisting of paraoxybenzoic acid ester and methylparaben.