JPH05337953A - Release agent for urethane foam - Google Patents

Abstract

(57) [Summary] [Object] To provide a mold release agent for urethane foam, which has a good mold release property in a cold molding process and can obtain a polyurethane foam product having an excellent surface condition. [Structure] 30% by weight or more of paraffinic hydrocarbon having a melting point of −5 ° C. or lower and a boiling point of 120 ° C. or higher, and one selected from the group of ester waxes, polyhydric alcohol esters, silicones, and fluorine-containing release agents. A release agent for urethane foam, which comprises one or two or more and has a total melting point of -5 ° C or lower and a boiling point of 120 ° C or higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release agent for urethane foam, and more particularly to a release agent for urethane foam produced by a cold molding process.

[0002]

2. Description of the Related Art An example of producing a polyurethane foam by a cold molding process will be described. Usually, a polyol or polyether is mixed with an undiluted solution containing a diisocyanate, a catalyst, a flame retardant and the like at an appropriate ratio, and the mixture is poured into a mold. After maintaining the mold temperature at about 20 to 100 ° C. for 2 to 30 minutes, the polyurethane foam molded product is taken out.

[0003] Polyurethane foams generally have a very strong adhesiveness during foaming, so that when releasing the foam obtained by foaming in the mold, it is easy to release the molded product from the mold beforehand. It is necessary to carry out an appropriate treatment of.

Conventionally, as this processing, for example, N-
A method has been proposed in which an organic solvent having a low boiling point such as hexane or 1-1-1 trichloroethane is coated with a release agent in which a wax-like substance is dispersed or dissolved to form a uniform thin layer of the release agent on the inner surface of the mold. There is.

However, in the above-mentioned mold release agent, since the evaporation rate of the organic solvent on the mold surface is high, the content of the organic solvent is large in order to form a uniform layer of the mold release agent on the mold surface. Had to do.

However, such a low boiling point organic solvent is apt to catch fire and has a problem in safety in use. Furthermore, in recent years, a method of spraying the paraffin wax in a molten state on the inner surface of the mold to form a release agent layer has been devised, but in the cold molding process, a uniform release agent layer cannot be formed and is put to practical use. Has not arrived.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems, and provides a polyurethane foam product having a good releasability in a cold molding process and an excellent surface condition. It is intended to provide a release agent for urethane foam which can be used.

[0008]

There are two inventions shown here. The first invention has a melting point of -5 ° C or less and a boiling point of 1 or less.
The present invention relates to a release agent for urethane foam, which contains 30% by weight or more of paraffinic hydrocarbon at 20 ° C or higher and has an overall melting point of -5 ° C or lower and a boiling point of 120 ° C or higher.

The second aspect of the present invention is that paraffin hydrocarbons having a melting point of −5 ° C. or lower and a boiling point of 120 ° C. or higher, 30% by weight or more, ester wax, polyhydric alcohol ester, silicone, and fluorine-containing release agent. Including one or two or more selected from the group of molding agents, the melting point of the whole-
The present invention relates to a release agent for urethane foam having a boiling point of 5 ° C or lower and a boiling point of 120 ° C or higher.

[0010]

EXAMPLES The present invention will now be described with reference to examples in order to more specifically describe the present invention, but the present invention is not limited to these examples.

The release agent for urethane foam of the present invention contains 30% by weight or more of paraffinic hydrocarbon having a melting point of -5 ° C or lower and a boiling point of 120 ° C or higher, and the release agent itself is-
It has a melting point of 5 ° C or lower and a boiling point of 120 ° C or higher.

The paraffinic hydrocarbon used in the present invention may be any one having a melting point of -5 ° C or lower and a boiling point of 120 ° C or higher, preferably a paraffinic hydrocarbon having 8 or more carbon atoms, such as N. -A variety of known paraffinic hydrocarbons such as -octane, N-decane, N-dodecane, and N-undecane and one or more isomers thereof are mixed and used.

The paraffinic hydrocarbon is usually 30 to
99% by weight is blended, and preferably 80 to 95% is contained. Further, the third component is added after being dissolved or dispersed as necessary. Paraffin hydrocarbon content is 30
If the content is less than the weight%, it becomes difficult to remove the molded product from the mold.

In the present invention, if necessary, an ester wax may be added to the above paraffinic hydrocarbon mixture.
One or more selected from the group of polyhydric alcohol esters, silicones, and fluorine-containing release agents can be blended.

Typical ester waxes are:
Carnauba wax and synthetic ester wax can be exemplified, and as polyhydric alcohol esters, tetra fatty acid ester of bentaerythritol can be exemplified. Up to 20% by weight of ester waxes and usually up to 10% by weight of polyhydric alcohol esters can be added to the release agent, but it is preferable to use both in combination at about 3% by weight.

As the silicone, it is usually used in the mold release agent.
It is preferable to add up to 5% by weight, preferably around 5% by weight. The fluorine-containing release agent is usually added to the release agent in an amount of 10% by weight, preferably about 5% by weight. The releasing agent mixture of the present invention can be applied by a conventional solvent type releasing agent spraying device, and the same effect can be obtained by manual brush coating.

Next, production examples of the release agent for urethane foam of the present invention will be shown. The unit of each component is% by weight
It is represented by. [Example 1] N-octane (melting point -57 ° C, boiling point 126 ° C) 60 polydimethylsiloxane 15 polyethylene wax 15 butyl stearate 10 The above components were mixed to obtain a release agent. The releasing agent thus obtained had a melting point of -5 ° C and a boiling point of 130 ° C.

Example 2 All the components were mixed in the same manner as in Example 1 except that N-octane was changed to N-dodecane (melting point −10 ° C., boiling point 216 ° C.) in Example 1, and a mold release agent was added. Obtained. The releasing agent thus obtained had a melting point of -10 ° C and a boiling point of 220 ° C.

[Example 3] In Example 1, N-octane was replaced with N-undecane (melting point -26 ° C, boiling point 195.6).
The components were mixed in the same manner as in Example 1 except that the temperature was changed to 0 ° C.) to obtain a release agent. The melting point of the obtained release agent is -25.
The boiling point was 200 ° C.

Example 4 N-dodecane (melting point −10 ° C., boiling point 216 ° C.) 50 polydimethylsiloxane 15 polyethylene wax 15 butyl stearate 20 The above components were mixed to obtain a release agent. The releasing agent thus obtained had a melting point of -10 ° C and a boiling point of 220 ° C.

Example 5 N-decane 50 N-undecane (melting point -26 ° C, boiling point 195.6 ° C) 50 The above components were mixed to obtain a release agent. The obtained releasing agent had a melting point of -30 ° C and a boiling point of 180 ° C.

Example 6 N-dodecane (melting point −10 ° C., boiling point 216 ° C.) 90 Perfluoropolyether oil 10 The above components were mixed to obtain a release agent. The releasing agent thus obtained had a melting point of -27 ° C and a boiling point of 220 ° C.

[Comparative Example 1] In the same manner as in Example 1, except that N-octane was changed to N-hexane (melting point: -95 ° C, boiling point: 69 ° C), the components were mixed and the release agent was added. Got

Comparative Example 2 In Example 1, N-octane was replaced with 2-2 dimethylbutane (melting point −100 ° C., boiling point 5
The components were mixed in the same manner as in Example 1 except that the temperature was changed to 0 ° C.) to obtain a release agent.

[Comparative Example 3] In the same manner as in Example 1 except that N-octane was changed to N-heptane (melting point -130 ° C, boiling point 36 ° C) in Example 1, the components were mixed to form a release agent. Obtained.

[Test Method] 1 g of each of the obtained release agent samples is applied to the front surface of a 300 × 300 × 200 lunch box mold having a mold temperature of 40 ° C. Two minutes after the application, 300 g of a polyurethane raw material is injected and reacted to obtain a polyurethane foam.

1. Surface condition: The surface of the obtained polyurethane foam was observed, and a good one was evaluated as ◯, a rough surface was evaluated as Δ, and a surface part of which was adhered to the mold surface was evaluated as x. 2. Releasability Polyurethane foam with good releasability from the mold is marked with ○, bad releasability with △, and polyurethane foam breaking is marked with x. 3. Odor after application After application, the one that hardly senses an odor by sensory test is ○,
The one that feels odor is x. The results are shown in the table.

[0028]

[0029]

As described above, according to the release agent for urethane foam of the present invention, since a uniform release agent layer is formed on the mold, it has a good release property in the cold molding process. Thus, a polyurethane foam product having an excellent surface condition can be obtained.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location (C10M 111/06 105: 04 107: 50 109: 00 105: 34 107: 38 105: 38) C10N 20:00 A 8217-4H 30:06 40:36

Claims (2)

[Claims] 1. A mold for urethane foam comprising a paraffinic hydrocarbon having a melting point of -5 ° C. or lower and a boiling point of 120 ° C. or higher in an amount of 30% by weight or more, and having a total melting point of -5 ° C. or lower and a boiling point of 120 ° C. or higher. Agent. 2. A paraffinic hydrocarbon having a melting point of −5 ° C. or lower and a boiling point of 120 ° C. or higher of 30% by weight or more, an ester wax, a polyhydric alcohol ester, a silicone,
One or two or more selected from the group of fluorine-containing release agents, the total melting point of -5 ℃ or less, the boiling point is 120
Mold release agent for urethane foam consisting of ℃ or more.