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Soft polyurethane foam production method

A technology of soft polyurethane and its manufacturing method, which is applied in the field of manufacturing polyester soft polyurethane foam, can solve the problems that the required level of hydrolysis resistance cannot be achieved, and the environment has not been considered, and achieve excellent flame retardancy and environmental protection. The effect of less pollution

Inactive Publication Date: 2010-01-20
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 above-mentioned technologies have not yet reached the required level of hydrolysis resistance required in the market, and the emergence of ester-based polyurethane foams with better hydrolysis resistance is expected.
In addition, the environment during foam manufacture and foam use is not considered

Method used

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  • Soft polyurethane foam production method
  • Soft polyurethane foam production method
  • Soft polyurethane foam production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] Hereinafter, examples and comparative examples of the present invention will be described in detail, but the present invention is not limited to these examples. Unless otherwise specified, "%" in the examples represents "mass%", respectively.

[0046] [Synthesis of polyester polyol]

Synthetic example 1～14

[0048] The raw materials shown in Tables 1 and 2 were added to a reactor equipped with a stirrer, a nitrogen introduction pipe, and a condenser, and polyester polyols PES-1 to 14 were synthesized under the reaction conditions shown below.

[0049] ·Normal pressure reaction: The reaction temperature was raised from 130°C to 200°C over 9 hours (common to all polyols). It should be noted that the internal pressure is normal pressure (101.3 kPa).

[0050] ·Reaction under reduced pressure: After reaction under normal pressure, reaction under reduced pressure is carried out. The reaction conditions under reduced pressure are as follows.

[0051] PES-1, 2, 6

[0052] → Tetrabutyl titanate was added in an amount corresponding to 10 ppm of the total charged amount, and the pressure was reduced from normal pressure to 1.3 kPa over 9 hours while keeping the reaction temperature at 200°C.

[0053] Polyester polyols other than the above

[0054] → Tetrabutyl titanate was added in an am...

Embodiment 1～8、 comparative example 1～7

[0073] Using the raw material liquids for preparing ester-based polyurethane foams in the blends shown in Tables 3 and 4, slab foams were produced with the isocyanate index in the same table. Other reaction conditions are as follows. After the reaction, place the obtained ester polyurethane foam at 23°C×50%RH for 24 hours, cut it into a specified sample shape, measure some of its physical properties immediately, and put a part in a constant temperature and humidity device, and take out the sample after a specified period of time , after standing at 23° C.×50% RH for 24 hours, the physical properties were measured. The endurance test conditions are as follows. It should be noted that the durability is evaluated on the date when the tensile strength and deep-drawing elongation become half of the value of the initial measurement value. Draw a straight line between them, and determine the date on which the half value of the initial measured value is shown on the graph.

[0074]...

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PUM

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Abstract

The invention provides a soft urethane foam which is characterized when compared with current ones by little environmental pollution, long durability and good fire-retardancy. The method for preparing said soft urethane foam is to proceed reaction with organic polyisocyanates (A) and polyatomic alcohol (B) on condition of foaming agent (C), catalyst (D), foam preparing agent (E) and hydrolysis inhibitor (F); and the method is characterized in that: said polyatomic alcohol is substance that contains 50-100% (by weight) of polyester polyol (B1) with the acid value lower than 0.3 mg KOH / g and the glycol contains aliphatic diol of alkyl with 1-5 carbon; catalyst contains active ammonia tertiary amine compound (D1); hydrolysis inhibitor contains carbodiimide compound (F1) and the isocyanate index at beginning of reaction is more than 100.

Description

technical field [0001] The present invention relates to a method for producing a polyester-based flexible polyurethane foam with less environmental pollution and better hydrolysis resistance than conventional polyester-based flexible polyurethane foams. Background technique [0002] Flexible polyurethane foam has been used in various fields such as automotive cushioning materials, furniture, bedding, carpets, clothing, and sporting goods due to its excellent elastic properties and light weight. In particular, flexible polyurethane foams using polyester polyols (hereinafter referred to as ester polyurethane foams) are compared with flexible polyurethane foams generally using polyether polyols (hereinafter referred to as ether polyurethane foams). , because it has excellent mechanical properties such as so-called tensile strength and tear strength, and is also excellent in heat resistance, so it is mostly used in parts requiring durability such as industrial machinery material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42C08G18/18C08G101/00
Inventor 吉井直哉
Owner NIPPON POLYURETHANE IND CO LTD