Flexible polyurethane?foam and manufacturing method thereof

A technology of flexible polyurethane and a manufacturing method, which is applied in the directions of packaged food, packaged item types, bandages, etc., can solve the problems of poor curability of flexible polyurethane foam, inability to meet thermoformability, etc., and achieve the effect of excellent discoloration resistance

Inactive Publication Date: 2012-10-24
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the flexible polyurethane foam obtained by these proposals has poor practical curability and cannot satisfy sufficient thermoformability.

Method used

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  • Flexible polyurethane?foam and manufacturing method thereof
  • Flexible polyurethane?foam and manufacturing method thereof
  • Flexible polyurethane?foam and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0061] Hereinafter, specific examples of the present invention will be further described. Of course, the present invention is not limited to the examples.

[0062] Synthesis of allophanate modified polyisocyanate (A1) 1

Synthetic example 1

[0064] Put 950 g of hexamethylene diisocyanate (HDI) and 50 g of butanol into a reactor with a capacity of 1 L equipped with a stirrer, a thermometer, a cooler, and a nitrogen gas introduction pipe, and perform a urethanization reaction at 90°C for 2 hours . The reaction product was analyzed by FT-IR, and the hydroxyl group disappeared. Next, 0.1 g of zirconyl octoate was charged and reacted at 90° C. for 3 hours. With FT-IR and 13 As a result of C-NMR analysis of the reaction product, the carbamate group disappeared. Next, 0.11 g of JP-508 (manufactured by Johoku Chemical Co., Ltd.) was charged, and the reaction was stopped at 50° C. for 1 hour. The isocyanate content of the reaction product after stopping the reaction was 40.14%. The reaction product was subjected to thin-film distillation at 140°C and 40Pa to obtain a "synthetic acid" with an isocyanate content of 18.6%, a viscosity of 91 mPa·s at 25°C, a free hexamethylene diisocyanate content of 0.1%, and a color numb...

Synthetic example 2

[0067] By the same method as Synthetic Example 1, drop into 950g hexamethylene diisocyanate (HDI), 50g 1,3-butanediol, after reaction, obtain " allophanate modified polyisocyanate-2 " (isocyanate content 20.2%, the viscosity at 25°C is 2460mPa·s, the free hexamethylene diisocyanate is 0.1%, and the color number is 20APHA).

[0068] Synthesis of Isocyanates Containing Isocyanurate Groups

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Abstract

The invention provides a yellowing-proof flexible polyurethane?foam and a manufacturing method thereof. The manufacturing method of the flexible polyurethane?foam is a manufacturing method allowing reaction of an organic polyisocyanate (A), a polyalcohol (B), a catalyst (C), a foaming agent (D) and a foam stabilizer (E) to form and to be solidified, so as to obtain the flexible polyurethane?foam. The manufacturing method is characterized in that the organic polyisocyanate (A) is mixture of the following substances: an allophanate group-containing organic polyisocyanate composition (A1) which is generated by a monohydric alcohol and an aliphatic and/or alicyclic diisocyanate, an allophanate group-containing organic polyisocyanate composition (A2) which is generated by a hydroxyl group-containing compound having more than two hydroxyl groups and an aliphatic and/or alicyclic diisocyanate, and an organic polyisocyanate compound (A3) which is generated by reaction of an aliphatic and/or alicyclic diisocyanate and a polyalcohol component (a1).

Description

technical field [0001] The present invention relates to a flexible polyurethane foam which is used in a wide range of applications, and which is less discolored even when exposed to light such as sunlight for a long period of time. In particular, it relates to a flexible polyurethane foam which is suitable for clothing such as shoulder pads and chest pads, napkins, Soft polyurethane foam for hygiene products such as paper diapers, cosmetics such as makeup puffs, shoes, bedding, frame laminates, furniture, etc. Background technique [0002] Hitherto, flexible polyurethane foams have been widely used for automobiles such as cushions, furniture, chest pads, shoulder pads, and other clothing materials due to their excellent properties such as softness and elasticity. As for the production methods of chest pads, shoulder pads, etc., there are methods of cutting soft polyurethane foam into desired shapes as final products, and methods of cutting into sheets and heating them in a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/78C08G18/79C08J9/04C08L75/04A41B17/00A41D31/00A61L15/26A45D33/34A43B1/14C08G101/00
Inventor 园田健太郎吉井直哉
Owner NIPPON POLYURETHANE IND CO LTD
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