JPH06254881A - Aqueous release composition for foam molding - Google Patents

Abstract

PURPOSE:To provide the title compsn. used at a time of the foam molding of polyurethane foam, having good drying properties, reduced in offensive smell, excellent in coating workability and productivity and reduced in the effect on environment or a human body. CONSTITUTION:An aqueous release compsn. for foam molding is constituted by adding 1-3C alcohol and a hydrocarbon solvent with a b.p. of 50-150 deg.C to an aqueous release agent prepared by dissolving, dispersing or emulsifying and dispersing wax, silicone oil or a fluorine type compd. in water using a surfactant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous release agent composition used for foam molding of polyurethane foam and the like.

[0002]

2. Description of the Related Art Conventionally, when a foamed molded product such as a polyurethane foam is manufactured, a mold release agent may be previously applied to the inner surface of the mold in order to facilitate the demolding of the molded product from the mold. It is generally done. As a release agent that has been widely used from the past, an organic solvent, for example, a so-called solvent-type release agent in which a wax or silicone oil or a fluorine compound is mixed with a petroleum solvent or a CFC solvent is used. ing. However, in the case of a solvent type release agent, workability is deteriorated due to the odor caused by the solvent, and it is regarded as a problem in that it adversely affects the environment and the human body.
The development of water-based water-based mold release agents is desired. For example, JP-B-53-23270 and JP-A-61-2
Japanese Patent No. 2912 and Japanese Patent Laid-Open No. 04-185310 have been proposed.

The mold release agent is generally used by applying it to the inner surface of the mold using a spray gun. At that time, since the mold temperature during foam molding of polyurethane foam or the like is usually relatively low (around 50 ° C.), the water-based water-based mold release agent requires a long time for drying. And to speed up the drying,
Compared with the case of solvent type release agent, the amount of discharge is greatly reduced and spray coating is performed. For this reason, the coating work of the product shape inside the mold (commonly called cavity) can be performed successfully even if the discharge amount is reduced, but vent holes (preventing gas from accumulating inside the mold and causing foaming of the foam body to occur). Pore diameter of about 1 mm
A small amount of small holes that communicate with the inside and outside of the mold) are blind spots, so the required amount cannot be applied. In other words, when molding is performed with insufficient coating inside the vent hole, the mold release is poor and a part of the foam cuts into the vent hole and becomes clogged. For this reason, the work of removing the clogging must be carried out each time the mold is released, and there is a problem that workability and productivity are significantly impaired. On the contrary, if the discharge amount is increased or the release agent is aimed at so as to reach the vent holes, it takes more time than necessary for drying, and productivity is reduced. Alternatively, there arises a problem that a liquid pool is generated in a portion where a large amount of a release agent is applied, which causes a problem such as cell roughness or a spot pattern on the surface of the molded product. The invention disclosed in the above-mentioned patent publication does not solve these problems.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention is a foam molding water which has good drying properties, has little odor, is excellent in workability and productivity, and has little adverse effect on the environment. An object is to provide a system release agent composition.

[0005]

[Means for Solving the Problems] In a water-based mold release agent, as a method having good drying properties and enabling application of a required amount, it is simply conceived to use an organic solvent in combination. However, since the solvent odor is usually strong in proportion to the amount of the organic solvent added, it has been considered difficult to prescribe a formulation that has a small solvent odor while ensuring the desired drying property and that has little effect on the environment or the human body. . In this regard, as a result of earnest research, it was found that a desired drying property can be obtained without a sense of discomfort with an odor in a limited combination of solvents, and the present invention has been completed.

The present invention provides (1) an aqueous release agent obtained by dissolving, dispersing, or emulsifying and dispersing a wax, a silicone oil, or a fluorine compound in water using a surfactant, and (2) having a carbon number. 1-3 alcohols, and
(3) A water-based mold release agent composition for foam molding, comprising a hydrocarbon solvent having a boiling point of 50 to 150 ° C.

As the water-based release agent referred to in the present invention, known ones can be used, and wax, silicone oil, and fluorine-based compound are emulsified with a surfactant as release agent components. Alternatively, it is dissolved or dispersed in water. Wax used in the present invention,
The silicone oil and the fluorine-based compound may be known ones, and can be used alone or in combination. Also, wax, silicone oil, and
Although the content of the fluorine-based compound is not particularly limited, it is generally 5 to 30% by weight based on the total amount of the water-based release agent.

The alcohol referred to in the present invention is an alcohol having 1 to 3 carbon atoms, and 2-propanol is particularly preferable. When the number of carbon atoms is 4 or more, the drying speed is slow and desired drying properties and coating workability cannot be obtained. The content of alcohol is preferably 5 to 20% by weight based on the water-based mold releasing composition for foam molding.

The hydrocarbon solvent having a boiling point of 50 to 150 ° C. in the present invention is, for example, n-hexane, n-heptane,
Examples include single compounds such as n-octane, isooctane, and cyclohexane, and mixtures such as benzine and rubber volatile oil. Moreover, you may use these, mixing them. It is desirable not to use an aromatic solvent or to use a solvent containing as little content as possible due to odor and effects on the human body. The content of the hydrocarbon solvent is preferably 5 to 20% by weight based on the water-based mold releasing composition for foam molding.

Further, the total content of the alcohol and the hydrocarbon solvent referred to in the present invention required to secure the desired coating workability is 20 to 35% by weight in the water-based release agent composition of the present invention. preferable. If it is less than 20% by weight, it is insufficient to secure the desired coating workability, and if the solvent exceeds 35% by weight, the odor becomes strong and the workability becomes poor.

When the solvent is blended with the water-based release agent, the alcohol of the present invention is soluble in water and may be added as it is. However, the hydrocarbon solvent of the present invention is insoluble in water.
If necessary, a surfactant is used to form an emulsion and blended.
When adjusting the water-based mold release composition for foam molding of the present invention,
The procedure of blending each component and emulsifying may be performed in any order. For example, alcohol or an emulsified hydrocarbon-based solvent may be added to the water-based release agent to obtain the water-based release agent composition of the present invention, or alcohol or a release agent component to be blended into the hydrocarbon-based solvent emulsion. Each emulsion of (wax, silicone oil, and fluorine compound) may be added.

If desired, other additives such as rust preventives, preservatives and thickeners may be added.

[0013]

【Example】

Examples 1 to 6 Water-based release agent manufactured by Neos Co., Ltd., Frelease 400 (1.5% by weight of a fluorine-based compound as a release agent component, wax 2.
Based on 5% by weight and 6% by weight of silicone oil, an aqueous mold release agent composition for foam molding containing the solvent shown in Table 1 was prepared (change in release agent component due to solvent addition operation is adjusted). Therefore, water is appropriately added so that the final release agent component is 5% by weight with respect to the water-based foaming molding release agent composition).

The following evaluation test was carried out on the obtained water-based mold releasing composition for foam molding, and the results are shown in Table 1. Drying and odor evaluation test 10 to 15 cm in a pressure foaming mold release tester (material: aluminum, molded product size: 13 x 10 x 1 cm) heated to 50 ° C
Separate and spray gun (RG-made by Iwata Coating Machine Industry Co., Ltd.)
2. The composition was applied uniformly using a nozzle diameter of 0.8 mm. The coating amount was 4 g and the coating time was 30 seconds. The dried state was visually observed, the time from the completion of coating to the time of drying was measured, and evaluation was performed according to the following two criteria. Dryability criterion Criteria Drying time within 30 seconds ・ ・ ・ ○ Drying time 30 seconds or more ・ ・ ・ ×

Further, the solvent odor when the discharge amount adjusting screw of the spray gun was opened wide and sprayed in the draft was evaluated in the following three stages. Odor judgment standard No odor ◎ Almost no ・ ・ ・ ○ Odor ・ ・ ・ ×

Evaluation Test of Releasability for Vent Hole A hole having a diameter of 2 mm is drilled using a drill in the upper mold (thickness = 2 cm) of the above-mentioned pressure foaming mold release tester to obtain a mold having a vent hole. did. The mold was heated to 50 ° C. and separated by 10 to 15 cm, and a water-based mold release agent for foam molding was uniformly applied with a spray gun (RG-2). In order to evaluate the workability in a limited working time, the application time was set to 30 seconds, and 3 after application.
An amount was applied to dry within 0 seconds. Next, the polyol of the integral skin foam formulation and the isocyanate are stirred and mixed for 5 to 7 seconds, and quickly poured into a mold. After 5 minutes, the mold was opened and the state of the foam remaining in the vent hole was observed. The same test was performed 5 times, and the number of occurrences of vent clogging is shown in Table 1.

[0017]

[Table 1] (Note) The weight% in the table is the value with respect to the entire water-based release agent composition for foam molding.

Comparative Examples 1 to 6 The compositions shown in Table 1 were prepared in the same manner as in Examples, and the same tests were conducted, and the results are shown in Table 1.

Example 7 and Comparative Examples 6 to 9 Using the compositions of the formulations of Example 2, Comparative Examples 1 to 3 and Comparative Example 5 (shown in Table 2), actual steering wheels were used in an automobile parts molding plant. Was molded and evaluated. The evaluation was carried out in the following three stages, and for the compositions that passed in sequence, proceeded to the next step. The results obtained are shown in Table 3.

First Evaluation (Evaluation of Odor) First, an on-site worker performed a coating operation on a mold with a spray gun, and evaluated the odor at that time according to the following criteria. Odor judgment standard Don't worry about odor ... ○ Be worried about odor ... ×

Secondary evaluation (this evaluation was performed on the composition having no odor in the primary evaluation) Twenty-five steering wheels were molded and the occurrence of clogging of vent holes was observed. The results are shown in Table 3.

Third evaluation (this evaluation was performed on the composition in which the vent hole was not clogged in the second evaluation) The solvent type currently used in the actual line for about one month Productivity was evaluated by comparison with a release agent. The results are shown in Table 3. In the formulation of Comparative Example 7, it is necessary to carefully perform the coating work around the vent portion in order to prevent the vent clogging. Therefore, the coating time and the drying time of the release agent are slightly longer, and the productivity is 10%. I went down.

[0023]

[Table 2]

[0024]

[Table 3]

[0025]

EFFECT OF THE INVENTION The water-based mold release composition for foam molding according to the present invention has good dryability, little odor, excellent coating workability and productivity, and has little effect on the environment and human body.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication location B29K 105: 04 (72) Inventor Yoshiko Kusano 1-1 Oike-cho, Kosai-cho, Koga-gun, Shiga Prefecture Stock Company In Neos

Claims (3)

[Claims] 1. A water-based release agent obtained by dissolving, dispersing or emulsifying and dispersing a wax, a silicone oil, or a fluorine-based compound in water using a surfactant or the like.
(2) Alcohol having 1 to 3 carbon atoms, and (3) Hydrocarbon solvent having a boiling point of 50 to 150 ° C., contained therein. 2. A water-based mold release agent composition for foam molding, each containing 5 to 20% by weight of a component of an alcohol having 1 to 3 carbon atoms and a hydrocarbon solvent having a boiling point of 50 to 150 ° C., , C1-C3 alcohol and boiling point 50-1
The aqueous release agent composition for foam molding according to claim 1, wherein the total content of the hydrocarbon solvent at 50 ° C. is 20 to 35% by weight. 3. The water-based mold releasing composition for foam molding according to claim 1 or 2, wherein the alcohol is 2-propanol.