Polyisocyanate composition for soft polyurethane foam and process for producing soft polyurethane foam from the composition

A technology of polyisocyanate and soft polyurethane, which is applied in the field of polyisocyanate composition for flexible polyurethane foam, can solve the problems of insufficient and undisclosed mechanical properties, and achieve the effect of high storage stability and good storage stability

Inactive Publication Date: 2010-03-10
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the current methods for producing flexible polyurethane foams, mainly the methods described in Patent Documents 1 and 2, the storage stability of the polyisocyanate composition used, the releasability at the time of reactive foaming, curing properties, etc. property and at least one of the mechanical properties and resilience of the obtained flexible polyurethane foam are not sufficient
In addition, although Patent Document 1 describes diphenylmethane diisocyanate containing 25 to 70% by weight of 2,4'-MDI, only 30% by weight of 2,4'-MDI is described in Examples, and there is no Disclosure of effects on mechanical properties, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0059] The present invention will be described in more detail below through examples, but the present invention is not limited to these examples. In addition, unless otherwise specified, "%" in Examples and Comparative Examples means "mass %", and "ratio (ratio)" means "mass ratio (ratio)".

[0060] [Synthesis of polyisocyanate (A)]

Synthetic example 1

[0062] 16 kg of MDI-1, 46 kg of MDI-2, and 23 kg of polyol-1 were added to a reactor equipped with a stirrer, a cooling pipe, a nitrogen gas introduction pipe, and a thermometer, and reacted at 80° C. for 5 hours while stirring. Next, 15 kg of PMDI-1 was added, and it stirred at 40 degreeC for 30 minutes, and polyisocyanate NCO-1 was obtained. NCO-1 has an NCO content of 25%. When NCO-1 was stored in a dark place at 0°C, no sedimentation or the like occurred even after 90 days.

Synthetic example 2～6

[0064] Using the same production apparatus as in Synthesis Example 1, pure MDI and polyol were reacted according to the formulation in Table 1, and then MDI was mixed and polymerized to produce NCO-2-6. The reaction temperature and time are the same as in Synthesis Example 1. Table 1 shows properties of the obtained polyisocyanate composition. In addition, the storage stability in a dark room at 0°C means the number of days after the obtained polyisocyanate composition was stored in a dark place at 0°C, and sedimentation and the like were first observed.

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PUM

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Abstract

To provide a soft polyurethane foam having a favorable storage stability and being simultaneously favorable in rebound resilience and mechanical properties. ¢MEANS FOR SOLVING PROBLEMS! There is provided a polyisocyanate composition for soft polyurethane foam obtained by performing a urethanization reaction of pure MDI (a) with an equivalent amount or less of polyol (b) under the following conditions and thereafter mixing a polymeric MDI (c) with the reaction product. (2,2'-MDI + 2,4'-MDI) / MDI = 60 to 85 mass%, and MDI / ((a) + (C)) = 50 to 90 mass% provided that the component (b) is a polyetherpolyol of 700 to 10,000 number average molecular weight, 2 to 8 functional groups on average and 10 to 40% in the content of oxyethylene in the repeating units.

Description

technical field [0001] The present invention relates to a polyisocyanate composition for flexible polyurethane foam and a method for producing flexible polyurethane foam using the composition. More specifically, the present invention relates to a polyisocyanate composition capable of obtaining a flexible polyurethane foam having excellent mechanical properties, resilience and compression set, and a method for producing a flexible polyurethane foam characterized by using the composition. Background technique [0002] Flexible urethane foam can be used in a wide range of applications such as cushioning materials for furniture, car seats, etc., mattresses for bedding, pillows, industrial sealing materials, and sound insulation materials by cutting to an appropriate size or molding with a product-shaped mold. use. In recent years, the demand for foams with good support properties and especially high flame retardancy has been increasing in furniture and mattress applications due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/77C08G18/00C08G18/48C08G101/00
CPCC08G2101/0008C08G18/10C08G18/4837C08G2110/0008C08G18/7664
Inventor 江川慎一吉井直哉
Owner NIPPON POLYURETHANE IND CO LTD
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