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Method for producing soft polyurethane foam with high air permeability and low resilience

A technology of soft polyurethane and a manufacturing method, which is applied in building structures, walls, building components, etc., can solve the problems of not being able to obtain and fully improve the high hardness of the foam, and achieve small changes, good compressive residual strain rate, Dependency improvement effect

Inactive Publication Date: 2009-02-11
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formulation described in this document cannot sufficiently improve the high hardness of the foam at low temperature, and there is a problem that a soft feeling of use cannot be obtained under low temperature conditions such as winter.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Hereinafter, although an Example, a reference example, and a comparative example demonstrate this invention concretely, this invention is not limited to these Examples.

[0066] Examples 1-3, Reference Example 1, Comparative Example 1

[0067] Polyurethane foams were prepared according to the mixing ingredients described in Table 1 below. That is, a polyol component, water, a catalyst, and a blowing agent are stirred and mixed, a polyisocyanate compound is added thereto, mixed, and the mixture is foamed to prepare a flexible polyurethane foam. As the amine catalyst, Reference Example 1 using a piperazine catalyst has a strong odor, so it is best to avoid using it in bedding and the like.

Embodiment 4～6、 comparative example 2 and 3

[0069] Polyurethane foams were prepared in the same manner as in the above examples by changing the mixing ratios of polyester polyol and polyether polyol according to the mixing components described in Table 2. In Comparative Example 3 in which the polyether polyol was 40 parts by mass, a foam with a normal appearance could not be obtained. It is evident from this table that specific mixing ratios must be mixed.

Embodiment 7～9、 comparative example 4 and 5

[0071] The isocyanate index was varied as shown in Table 3. The table indicates that a specific range of isocyanate index is required.

[0072] The density (kg / m3) of the polyurethane foam obtained according to each embodiment, reference example and comparative example 3 ), hardness (25% CLD: N / 100cm 2 ), tensile strength (kPa), compression residual strain (%), ball rebound rate (%), shape recovery time, air permeability (cm 3 / cm 2 / s), and evaluate the degree of rupture and stickiness of the obtained foam cells. The results are shown together in the table.

[0073] Table 1

[0074] Example 1 Example 2 Example 3 Reference example 1 Comparative example 1 polyisocyanate compound

Polyol 1

Polyol 2

Polyol 3

Polyol 4

Catalyst 1

Catalyst 2

Catalyst 3

Catalyst 4

Foam stabilizer

water TDI

80

20

0.2

0.2

1

2 TDI

85

15

0.2

0.2

1

2 TDI

8...

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Abstract

The invention provides a viscoelastically flexible polyurethane foam having excellent viscoelastic performance useful as a vibration, sound or impact absorber or as a mattress, pillow, cushion, or the like, capable of more uniformly dispersing human body pressure than conventional flexible polyurethane foam, thus effective in reducing sense of fatigue and bedsore, therefore excellent in terms of human engineering. The flexible polyurethane foam is provided, comprising carrying out a reaction between a polyisocyanate(A), a polyol(B), a foaming agent(C), a catalyst(D) and a foam stabilizer(E),wherein, the polyol(B) comprises (b1) a polyester polyol with an average functional group number of 2.5-4.5 and a hydroxy equivalent of 300-500 and (b2) a polyalkylene polyol with an average functional group number of 2.5 and a hydroxy equivalent of 500-3,000 in a specific proportion. The isocyanate index of this flexible polyurethane foam is 50-100.

Description

technical field [0001] The invention relates to a method for manufacturing a soft polyurethane foam with low resilience and high air permeability. Background technique [0002] So far, it is a low-resilience flexible polyurethane foam commonly used in the processing of various laminated products as shock absorbing materials and vibration absorbing materials, or in cushions, mattresses, cushions, back cushions, clothing liners, etc. is known. The polyurethane foam used in these products is carried out in such a way that a polyurethane foam having a desired resilience rate can be obtained by appropriately selecting the resin composition of the polyurethane foam, that is, the types of the polyol component and the polyisocyanate compound. Prepared. [0003] However, although the low-resilience polyurethane foams disclosed so far have a desired low resiliency rate, they have almost no air permeability, and for example, when used in liners, mattresses, cushions or cushions, etc....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/16C08G101/00C08G18/20C08G18/42
CPCE04B1/612E04B2/721E04B2/7401E04B2/7448
Inventor 吉井直哉平山智子矢口仁史
Owner NIPPON POLYURETHANE IND CO LTD
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