JPH05229047A - Unsaturated polyester resin foam - Google Patents

Abstract

PURPOSE:To enhance releasability and strength after molding by interposing unsaturated polyester resin foam between air permeable sheets. CONSTITUTION:1.5 pts.wt. of dicumyl peroxide, 1 pts.wt. of wax, 2.5 pts.wt. of azodicarbonamide and 2.5 pts.wt. of a urea type auxiliary agent are added to 100 pts.wt. of an unsaturated polyester resin containing 15 pts.wt. of a styrene monomer to form a sheet with a thickness of 1mm. This sheet is interposed between two polyester fiber nonwoven fabrics with a thickness of 0.2mm to be put in a mold and the whole is subjected to compression molding under a molding pressure of 200kg/cm<2> at 145 deg.C for 5min to obtain unsaturated polyester resin foam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to electric equipment, vehicles, building materials,
The present invention relates to an unsaturated polyester resin foam used for furniture and the like.

[0002]

2. Description of the Related Art Conventional unsaturated polyester resin foams have drawbacks in mold releasability and strength after molding, and improvement thereof has been strongly demanded.

[0003]

As described in the prior art, the conventional unsaturated polyester resin foam has a problem in releasability and strength after molding. The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide an unsaturated polyester resin foam having good mold releasability during molding and high strength.

[0004]

The present invention is an unsaturated polyester resin foam characterized in that an unsaturated polyester resin foam is interposed between breathable sheets, and therefore the above object can be achieved. The present invention will be described in detail below.

As the unsaturated polyester resin used in the present invention, all unsaturated polyester resins including modified products such as hydrogenated bisphenol resins can be used.
As the cross-linking agent, a styrene monomer, a diallyl phthalate monomer or the like is used, but it is not particularly limited. As the polymerization initiator, dicumyl peroxide, benzoyl peroxide and the like are used, but the polymerization initiator is not particularly limited. Examples of the foaming agent include inorganic foaming agents such as ammonia carbonate, sodium bicarbonate, and nitrourea, dinitrosopentamethylenetetramine, NN dimethyl NN dinitrosoterephthalamide, benzenesulfonyl hydrazide, P toluenesulfonyl hydrazide, PP oxybisbenzenesulfonyl hydrazide, 33 disulfone hydrazide. Diphenyl sulfone, adbisisobutyronitrile, azodicarbonamide, barium azocarboxylate, a foam using an organic foaming agent such as diethyl azodicarboxylate, or carbon dioxide gas can be injected to form a foam, All unsaturated polyester resin foams can be used. Further, if necessary, a urea-based auxiliary agent, an organic acid-based auxiliary agent, a metal salt-based auxiliary agent, a mixed-type auxiliary agent or the like can be used as a foaming auxiliary agent. Further, if necessary, a low shrinkage agent such as a thermoplastic resin, a filler, a reinforcing agent such as pulp, wood powder, calcium carbonate, or glass fiber, a coupling agent,
A colorant, a release agent, etc. can also be added. As the breathable sheet, glass, inorganic fibers such as asbestos, organic fibers such as polyester, polyamide, polyacryl, polyvinyl alcohol, polyimide and fluororesin, and natural fibers such as cotton, woven cloth, non-woven cloth, mat, paper and the like are used. I can do things. The number of breathable sheets is arbitrary, and different breathable sheets may be used on each side. An adhesive may be used to bond the breathable sheet and the unsaturated polyester resin foam, but it is preferable to utilize self-adhesiveness by foaming the unsaturated polyester resin between the breathable sheets, It is not particularly limited.

The present invention will be described below based on examples.

[0007]

Example 1 To 100 parts of an unsaturated polyester resin containing 15 parts by weight of styrene monomer (hereinafter simply referred to as "part"), 1.5 parts of dicumyl peroxide, 1 part of wax,
After adding 2.5 parts of azodicarbonamide and 2.5 parts of urea-based auxiliary agent to a sheet with a thickness of 1 mm, a thickness of 0.2 mm
The mixture was put into a metal mold by interposing it between two sheets of the polyester fiber non-woven fabric, and compression molded at 145 ° C. for 5 minutes at a pressure of 200 Kg / cm ² to obtain an unsaturated polyester resin foam.

[0008]

Example 2 An unsaturated polyester resin foam was obtained in the same manner as in Example 1 except that a glass mat having a thickness of 0.2 mm was used instead of the polyester fiber nonwoven fabric.

[0009]

[Comparative Example] An unsaturated polyester resin foam was obtained in the same manner as in Example 1 except that the breathable sheet was not used. The performance of the unsaturated polyester resin foams of Examples 1 and 2 and Comparative Example is as shown in Table 1.

[0010] The present invention is configured as described above. It was confirmed that the unsaturated polyester resin foam having the constitution described in the claims has good mold releasability at the time of molding and improved strength, and is excellent in the present invention.

Claims (1)

[Claims] 1. An unsaturated polyester resin foam characterized in that an unsaturated polyester resin foam is interposed between breathable sheets.