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Use straddling microsphere and water as co-foaming agent to prepare low density polyurethane integral surface foam system

A technology of expanding microspheres and polyurethane, which is applied in the field of foam footwear products, can solve the problems that thermoplastic polyurethane is not suitable, foam products are expensive, and low density, and achieve good hydrolysis resistance

Active Publication Date: 2007-10-03
埃拉凯姆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] TPU is not suitable for obtaining foam products with densities below 0.30 g / ml and requires expensive injection machines
[0015] Known liquid reactive systems can be used without losing the desired physical and mechanical properties (e.g. good surface, flexibility, abrasion resistance, extensibility, split tear resistance) which are usually important for shoe soles, insoles and footwear products. , tensile strength, elasticity), not suitable for the production of foam footwear products with a product density lower than 0.30 or a free rising density lower than 0.18
In other words, there is no teaching in the prior art on how to manufacture footwear products with very low density (i.e. specific gravity below 0.30-0.28 g / ml for molded products) and good properties

Method used

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  • Use straddling microsphere and water as co-foaming agent to prepare low density polyurethane integral surface foam system
  • Use straddling microsphere and water as co-foaming agent to prepare low density polyurethane integral surface foam system

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] In the preparation of the material, best results are obtained by first developing microspheres, compounds containing chain extenders (such as MEG), and other additives (catalysts, surfactants, surfactants, and emulsifiers) required for polyurethane foaming. Cell agent, foaming agent and cell regulator) are mixed, and then these compounds are mixed with polyol: the temperature of polyol should not exceed 55-60°C. If compounds with microspheres are mixed with polyols at higher temperatures, the properties of the microspheres may be destroyed because they are at a temperature too close to their "snapshot", which should only happen during the expansion step .

[0055] The molding step was performed by using existing conventional equipment of any type without any modification necessary. Additives, microspheres and water are added to the polyol, the added polyol and isocyanate prepolymer are added to a known mixing head and cast or injected into a mould.

[0056] Keep the t...

Embodiment 1

[0061] Example 1 - Production of sandal soles

[0062] 550 g of "lipid" polyester resin with MW 2000 and OH number 56 were mixed with 200 g of polymeric resin with MW 2500 and OH number 60, 150 g of dicarboxy resin with MW 2000 and OH number 60, 130 g of chain extender (monoethylene glycol ), 11 g of triethanolamine, 13 g of ammonia delayed catalyst (Dabco), a small amount of pore regulator and emulsifier, 1% (10.5 g) of expandable microspheres and 0.69% (7.5 g) of water were mixed. This mixture of polyol+additives and water and microspheres was reacted with 1200 g of an MDI based prepolymer having an NCO of 23% and a functionality of 2.03.

[0063]After free-rise casting, the following values ​​were obtained (time zero is the start of casting): milky phase: 7 seconds; microsphere expansion time: start at 10 seconds and end at 18 seconds; end of rise time: 50 seconds ; Initial temperature: 50°C; Maximum temperature: 110°C; Free rise density: 0.12g / ml.

[0064] The same compo...

Embodiment 2

[0067] Embodiment 2 - be used for the production of sports shoe insole

[0068] The polyurethane system of Example 1 was used, but the amount of microspheres was 8% by weight and the amount of water was 2.2% by weight.

[0069] The free rise density obtained with this formulation was 0.07 g / ml, and, despite the increased amounts of microspheres and water, the reaction was slow enough to result in controlled and uniform filling of the mold, with no cracks or cracks in the final product. "Stomata" (air entrainment).

[0070] The following table shows the comparison of the known method and the method of the present invention and the final characteristics of the product of Example 2.

[0071] prior art methods

The method of the invention

Isocyanate

Polyol

Isocyanate

Polyol

Operating temperature

35℃

45℃

35℃

45℃

Isocyanate / Polyol Ratio

80

100

110

100

Hardness

35 SHOREA

...

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Abstract

Foam products with densities between 0.10 and 0.28 are obtained by reacting at least one polyol with at least one isocyanate-prepolymer, in the presence of an amount of expandable microspheres within the range of 0.5 to 10% by weight on the weight of said polyol and an amount of expanding agent which is from 0.5 to 4,0 times the amount normally used for such polyol / isocyanate-prepolymer systems, and carrying out the polymer expansion step at a temperature which is sufficient to cause the substantially simultaneous expansion of the microspheres.

Description

technical field [0001] The object of the present invention is a polyurethane system and a method for producing low-density foam footwear with an integral surface. More specifically, the present invention relates to a method for producing low density foam products from reactive liquid polyurethane systems comprising isocyanate prepolymers, polyols, additives, blowing agents and expandable microspheres by reaction of polyols and isocyanates And the foam footwear thus obtained. The product is obtained by casting or injection molding a mixture of system components in a reacting mold. Particular products are flexible foam products such as shoe insoles and soles. Background technique [0002] The polyurethane systems, methods and products of the present invention involve the known reaction of the system components in the mold in order to obtain a foam product with a surface integral to the product. According to known techniques, predetermined amounts of the two components (poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/32
CPCC08G18/10C08G2101/0033C08G2101/005C08G2101/0083C08G2410/00C08J9/32C08J9/34C08J2203/22C08J2375/04C08K7/22C08L75/04C08G2110/0033C08G2110/005C08G2110/0083C08G18/6622
Inventor 弗代里科·布鲁萨达维德·布兰比拉斯卡
Owner 埃拉凯姆有限公司
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