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Preparation and application of low-density full diphenyl-methane-diisocyanate (MDI)-base high-resilience polyurethane foam

A technology of foam plastics and polyurethane, which is applied in the application field of car seat materials, and can solve problems such as easy waste, large compression permanent deformation, and narrow process range

Active Publication Date: 2011-03-23
湖州合达图宏新材料技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The reaction speed of MDI is relatively fast, and it is easy to cause closed cells and bubble collapse at the same time;
[0005] (2) The process range is relatively narrow, and the requirements for molding process conditions and molds are relatively high, and waste products are prone to occur;
[0006] (3) It is relatively difficult to reduce the foam density;
[0007] (4) Compression permanent deformation is relatively large

Method used

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  • Preparation and application of low-density full diphenyl-methane-diisocyanate (MDI)-base high-resilience polyurethane foam
  • Preparation and application of low-density full diphenyl-methane-diisocyanate (MDI)-base high-resilience polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Preparation of component A:

[0097] According to the formula given in Table 1, stir evenly at normal temperature and get final product.

[0098] Table 1. Composition of Part A

[0099]

Embodiment 2

[0101] Preparation of Component B:

[0102] (1) Synthesis of carbamate modified MDI prepolymer (I):

[0103] (1) Dehydration of polyols: first put a sufficient amount of polyether polyol GEP-360N into a reaction kettle with a stirrer and a vacuum system, heat to 120°C under stirring, then vacuumize to -0.09MPa, dehydrate at 120 minutes, then cooled to room temperature.

[0104] (2) Preparation of carbamate-modified MDI prepolymer (I): 78 parts of 4,4'-MDI and 22 parts of 2,4-MDI / 4,4MDI mixture Put it into another reaction kettle, under the protection of nitrogen, stir and heat up to 60°C, then add 10 parts of the above-mentioned dehydrated GEP-360N polyether polyol in batches, and the feeding speed is based on the fact that the exotherm of the reaction mixture does not exceed 80°C The upper limit, after adding the polyol, continue to react for 4 hours, cool to room temperature, pack and store in a sealed container. Tested according to GB 12009.4-89, the NCO content is: 3...

Embodiment 3

[0111] Preparation of low-density all-MDI-based high-resilience polyurethane foam:

[0112] The process conditions for preparation are: component A: component B is equal to 100:65; the mold temperature is 50°C; the material temperature is 22°C and the injection pressure is 11Mpa. Mold size is 40*40*10cm 3 .

[0113] The technical properties of the high-resilience polyurethane foam formed by the corresponding compositions of component A of Example 1 and component B of Example 2 are listed in Table 2. A1 / B represents the high-resilience polyurethane foam formed by the casting foaming process of the formulation 1 of component A in Table 1 and component B in Example 2. Similarly, A2 / B represents the formula 2 of component A in Table 1 and the high-resilience polyurethane foam formed by component B in Example 2 through a pouring foaming process; A3 / B represents the formula of component A in Table 1 3 and the high-resilience polyurethane foam formed by pouring and foaming process...

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PUM

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Abstract

The invention discloses a full diphenyl-methane-diisocyanate (MDI)-base high-resilience polyurethane foam which comprises a polyatomic alcohol mixture component A and a modified MDI component B, wherein the component A is a polyatomic alcohol mixture, the component B is the mixture of carbamate modified MDI and allophanate modified MDI, and the weight ratio of the carbamate modified MDI to the allophanate modified MDI is 1:99-95:5. The high-resilience polyurethane foam prepared by polymerizing the component A and the component B in weight ratio of 100:50-100:80 has a density of 38-45kg / m<3>, and can be used for manufacturing car seats.

Description

technical field [0001] The invention relates to a preparation method of low-density high-resilience polyurethane foam and its application as a car seat material. Background technique [0002] The current low-density high-resilience polyurethane (HR-PU) foam is mainly made of toluene diisocyanate (TDI) as the basic raw material. Since TDI is listed as a highly toxic chemical, diphenylmethane diisocyanate (MDI ) Complete replacement of TDI is the inevitable trend of manufacturing HR-PU foam plastics in the future. [0003] Although all-MDI-based HR-PU foam has the advantages of environmental protection and low toxicity, compared with TDI-based, there are some technical problems as follows: [0004] (1) The reaction speed of MDI is relatively fast, and it is easy to cause closed cells and bubble collapse at the same time; [0005] (2) The process range is relatively narrow, and the requirements for molding process conditions and molds are relatively high, and waste products a...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/48C08G18/10B60N2/00C08G101/00
Inventor 万小龙蔡杰
Owner 湖州合达图宏新材料技术股份有限公司
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