Soft polyurethane foam and its manufacture method

A kind of soft polyurethane, the technology of manufacturing method, applied in the direction of packaged food, packaged item types, bandages, etc., can solve the problems of uneven pore state, discoloration, low reaction stability, etc., and achieve excellent discoloration resistance and good compression permanent deformation Effect

Active Publication Date: 2011-04-27
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The purpose of the present invention is to provide a flexible polyurethane foam suitable for the existing production conditions, which can solve the shortcomings of the existing...

Method used

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  • Soft polyurethane foam and its manufacture method
  • Soft polyurethane foam and its manufacture method
  • Soft polyurethane foam and its manufacture method

Examples

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Embodiment

[0062] Hereinafter, specific examples of the present invention will be further described. Of course, the present invention is not limited to the examples.

[0063] Manufacture of allophanate modified polyisocyanate

Synthetic example 1

[0065] Add 950 g of hexamethylene diisocyanate (HDI: manufactured by Nippon Polyurethane Industry Co., Ltd.) and 50 g of isopropanol to a reactor with a capacity of 1 L equipped with a stirrer, a thermometer, a cooler, and a nitrogen gas introduction pipe, and carry out the process at 90° C. for 2 hours. carbamate reaction. Analysis of the reaction product by FT-IR revealed that the hydroxyl group disappeared. Next, 0.1 g of zirconyl octoate (manufactured by Daiichi Zengen Chemical Industry Co., Ltd.) was added, and it was made to react at 90 degreeC for 3 hours. With FT-IR and 13C-NMR analysis of the reaction product revealed that the carbamate group disappeared. Next, 0.11 g of JP-508 (manufactured by Johoku Chemical Co., Ltd.) was added, and the reaction was stopped at 50° C. for 1 hour. The isocyanate content of the reaction product after stopping the reaction was 40.46%. The reaction product was subjected to thin-film distillation at 140°C and 40Pa to obtain a "stainl...

Synthetic example 2

[0067] Except adding 950g hexamethylene diisocyanate (HDI), 50g 3-methylpentanediol, by the same method as synthetic example 1, obtain " allophanate modified polyisocyanate-2 " (isocyanate content is 19.1%, the viscosity at 25°C is 1720mPa·s, the free hexamethylene diisocyanate is 0.1%, and the color index is 20APHA).

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Abstract

The invention provides a soft polyurethane foam and its manufacture method capable of solving the above problem, characterized in that: the mixing solution of an organic polyisocyanate (A), a polyhydric alcohol (B), a catalyst (C), a foaming agent (D) and a foam stabilizer (E) reacts, foams and cures to obtain the soft polyurethane foam, wherein the organic polyisocyanate (A) uses the mixture of an organic polyisocyanate combination A1 modified by an allophanate composed of a monohydric alcohol and aliphatic and/or alicyclic ring diisocyanate and an organic polyisocyanate combination A2 modified by the allophanate composed of an alcohol with more than two hydroxyl groups and the aliphatic and/or alicyclic ring diisocyanate.

Description

technical field [0001] The present invention relates to a flexible polyurethane foam that is less discolored even when it is exposed to light such as sunlight for a long period of time among flexible polyurethane foams used in a wide range of applications. In particular, it relates to a flexible polyurethane foam suitable for shoulder pads, breast pads, etc. clothing materials, napkins, and paper diapers Soft polyurethane foam for hygiene products such as cosmetics such as makeup puffs, shoes, bedding, flame laminates, and furniture. Background technique [0002] Conventionally, flexible polyurethane foam has been widely used in automobiles such as cushions, furniture, and clothing such as chest pads and shoulder pads due to its excellent properties such as softness and elasticity. Toluene diisocyanate ( Aromatic polyisocyanates such as TDI). However, polyurethane foam obtained using aromatic polyisocyanate has a problem of being easily discolored by sunlight or the like. ...

Claims

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Application Information

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IPC IPC(8): C08G18/78C08G18/24A61L15/26A61L15/42A45D33/34A43B1/14C08G101/00
Inventor 园田健太郎石桥圭太伊东浩幸吉井直哉
Owner NIPPON POLYURETHANE IND CO LTD
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