Method for preparing Soft polyurethane foam with excellent ball elasticity

Abstract

The object of this invention is to improve ball reboundability (a rebound elastic function) without reducing physical properties such as mechanical strengths, compressive strengths and the like of a flexible polyurethane foam. In a method for forming a flexible polyurethane foam using a molding composition comprising an organic diisocyanate, a high molecular polyol, a catalyst, a foam stabilizer, a foaming agent using water or water and an arbitrary foaming agent, a low molecular compound having an adjacent carbon-carbon unsaturated bond and a carbonyl group is added to the composition as a modifier in 1-20wt.% based on the high molecular polyol.

Description

technical field [0001] The present invention relates to a preparation method of flexible polyurethane foam, and more specifically relates to a preparation method of flexible polyurethane foam with ball resilience improved by using a specific modifying agent. Background technique [0002] Recently, plastic materials have been widely used as important materials in all fields of industrial technology. Among them, polyurethane-based resins have been reused in various applications due to their excellent physical properties, economical efficiency, moldability, and wide range of applications. [0003] Polyurethane resins have urethane bonds in their molecules, and are synthesized by polyaddition reactions of diisocyanates and compounds with active hydrogen. Due to their excellent properties such as wear resistance, durability, mechanical properties, and chemical resistance, they can be obtained A wide range of molded products from soft to hard, so it is widely used in synthetic lea...

AI Technical Summary

Problems solved by technology

[0005] As a flexible foam used as a cushioning material, not only physical properties such as mechanical strength and compressive strength, but also ball resiliency (rebound performance) are important functions. In the past, in order to improve the ball resiliency, from the viewpoint of polyurethane manufacturing materials, Methods such as introducing ether units derived from ethylene oxide into the molecular chain of the polymer polyol (see Patent Document 1), or increasing the hydroxyl equivalent of the polymer polyol, but if these methods are adopted, although the ball resilience Although it is improved, it leads to the problem that mechanical strength such as tensile breaking strength, elongation at tensile breaking, tensile breaking strength, or compressive strength decreases.

In addition, as a polyisocyanate, a production method of improving repellency by using an isocyanate group-terminated prepolymer reacted with diphenylmethane diisocyanate and a poly(oxyalkylene) polyol has been proposed (see Patent Document 2), but this cannot be achieved. Resilience and other mechanical properties can fully meet the requirements

[0006] A method for preparing flexible polyurethane foams excellent in elasticity that does not require crushing operations has been disclosed by using m-phenylene diisocyanate and diphenylmethane diisocyanate and long-chain polyols polyoxyethylene polyoxypropylene polyols and blowing agents ( Referring to Patent Document 3), the method of specifying the air flow rate of flexible polyurethane foam, the resistance value at the time of compression, etc. by using an oxyethylene compound such as oxyethylene random polymerization and polyol in combination (see Patent Document 3) 4) etc., but did not improve the ball resilience without reducing the mechanical strength and compressive strength, etc.

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