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Polyisocyanate composition and process for production of flexible polyurethane foam by using the same

A technology of polyisocyanate and diisocyanate, which is applied in the field of polyisocyanate composition, can solve problems such as insufficiency, and achieve the effect of high storage stability

Inactive Publication Date: 2010-02-03
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the current methods for producing flexible polyurethane foams, mainly the methods described in Documents 1 to 3, moldability such as storage stability of the polyisocyanate composition used, releasability during reactive foaming, curability, etc. And at least one aspect of the mechanical properties and resilience of the obtained flexible polyurethane foam is not sufficient

Method used

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  • Polyisocyanate composition and process for production of flexible polyurethane foam by using the same
  • Polyisocyanate composition and process for production of flexible polyurethane foam by using the same
  • Polyisocyanate composition and process for production of flexible polyurethane foam by using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7 and comparative example 1～6

[0074]

[0075] In Example 1, a polyisocyanate composition (C-60) was prepared as follows. That is, after replacing the reactor equipped with a stirrer, a cooling pipe, a nitrogen gas introduction pipe, and a thermometer with nitrogen, 32 kg of MDI-1 and 30 kg of MDI-2 (the composition of MDI is shown in Table 1) were added and heated to 80°C. Next, 38 kg of EL-838 was added and reacted at 80° C. for 4 hours while stirring to obtain a polyisocyanate composition (C-60) containing an MDI isocyanate group-terminated prepolymer (reaction product). The NCO content in the obtained prepolymer was 20.0%, and the 2,4'-MDI content was 58.6%.

[0076] In addition, in Examples 2-4 and Comparative Examples 1-3, in the same manner as in Example 1, the polyisocyanate composition described in Table 1 was obtained (Example 2: C-70, Example 3: C-80; Example 4: C-90, Comparative Example 1: C-19, Comparative Example 2: C-40, Comparative Example 3: C-98). The NCO content and 2,4'-MDI content i...

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Abstract

A polyisocyanate composition comprising a product which is obtained by reacting diphenylmethane diisocyanate having a 2,4'-diphenylmethane diisocyanate content of 55 to 90% by mass with polyoxyethylene-polyoxypropylene polyol having an oxyethylene content of 1 to 40% by mass, an average hydroxyl equivalent of 700 to 2500, and a nominal average functionality of 2 to 6 and which has an isocyanato group content of 15 to 30% by mass.

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 same. Background technique [0002] Flexible urethane foam is cut to an appropriate size and used in a wide range of applications such as cushioning materials for furniture and car seats, mattresses for bedding, pillows, industrial sealing materials, and soundproofing materials. In recent years, the demand for foams with good support properties and high flame retardancy has been increasing in furniture and mattress applications due to the aging population. In addition, a highly reactive and highly curable raw material system with high production efficiency is desired at the production site. [0003] As a flexible polyurethane foam, a technique using toluene diisocyanate as a polyisocyanate component is generally known. However, the freezing point of toluene diisocyanate is as high as about 17° C....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G101/00C08G18/48
CPCC08G2101/0008C08G18/10C08G18/4837C08G65/33355C08G2110/0008
Inventor 江川慎一吉井直哉
Owner NIPPON POLYURETHANE IND CO LTD
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