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Soft polyurethane foam with excellent density distribution

A soft polyurethane and density distribution technology, applied in the field of polyurethane, can solve the problems of uneven foam density distribution, poor cell, unstable foaming process, etc., and achieve excellent density distribution, fine cells, and stable foaming process Effect

Active Publication Date: 2019-06-07
南京美思德新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present invention is to solve the problems of uneven density distribution of foam in the prior art, poor cell and unstable foaming process, and to provide a flexible polyurethane foam with excellent density distribution

Method used

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  • Soft polyurethane foam with excellent density distribution
  • Soft polyurethane foam with excellent density distribution
  • Soft polyurethane foam with excellent density distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 83.5g polysiloxane (its average formula is MD 90 D' 6.0M) and 182.0 g of an allyl-initiated, ester-terminated polyoxyalkylene having an average molecular weight of 4000, containing 40% by weight of ethylene oxide groups and 60% by weight of propylene oxide groups (in Here, referred to as polyether A); 34.5 g of an allyl-initiated, ester-terminated polyoxyalkylene having an average molecular weight of 550, containing 40% by weight of oxirane groups and 60% by weight The propylene oxide group (herein, referred to as polyether B).

[0040] Add 80 μL of dibutylaminoethanol through a pipette gun, and stir, heat the mixture to 90-95°C, and stir for about 10min, add 8ppm of Pt (ethanol solution of chloroplatinic acid), and maintain the mixture in the bottle at 90-95°C, after one hour, measure the Si-H content of the mixture to be less than 0.2mL / g, vacuum remove low molecular weight products, add 3.9g hydrogen peroxide after two hours, stir for half an hour, heat up to 9...

preparation Embodiment 6～12

[0042] Table 1 Different polyether combinations Preparation Examples 6-12 and Comparative Examples 2-5

[0043]

[0044] Polyether A:

[0045] CH 2 =CH-CH 2 (C 2 h 4 ) a (C 3 h 6 O) b OC(O)CH 3 ;

[0046] EO / POwt%=2:3; Mn4000g / mol;

[0047] Polyether B:

[0048] CH 2 =CH-CH 2 (C 2 h 4 ) a' (C 3 h 6 O) b' OC(O)CH 3 ;

[0049] EO / POwt%=2:3; Mn550g / mol;

[0050] Polyether C:

[0051] CH 2 =CH-CH 2 (C 2 h 4 ) a″ (C3H6O) b″ OC(O)CH 3 ;

[0052] EO / POwt%=2:3; Mn1200g / mol;

[0053] Polyether D:

[0054] CH 2 =CH-CH 2 (C 2 h 4 ) a' (C 3 h 6 O) b' OC(O)CH 3 ;

[0055] EO / POwt%=2:3; Mn300g / mol;

[0056] Polyether E:

[0057] CH 2 =CH-CH 2 (C 2 h 4 ) a″ (C 3 h 6 O) b″ OH;

[0058] EO / POwt%=2:3; Mn1200g / mol;

[0059] The examples were mixed with different solvents in different weight ratios, specifically using different solvent combinations as shown in Table 2.

[0060] Table 2 Different Solvent Combinations

[0061]

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Abstract

The invention discloses soft polyurethane foam with excellent density distribution, and belongs to the technical field of polyurethane. The problems that in the prior art, density distribution of foamis not uniform, foam holes are poor and a foaming process is not stable are solved. According to the invention, an synthesized organic silicon surfactant with a relatively low density and a relatively low density gradient is firstly applied to preparation of the polyurethane foam, so that the density distribution of the synthesized polyurethane foam is more uniform, foam holes are more excellent,emulsification performance is better, and the foaming process is more stable.

Description

technical field [0001] The invention relates to a polyurethane foam, in particular to a flexible polyurethane foam with excellent density distribution, and belongs to the technical field of polyurethane. Background technique [0002] Polyurethane foam is mainly prepared by generating gas during the polymerization process of raw materials such as polyether (or polyester) polyol, isocyanate, water, catalyst, foam stabilizer and other additives, and the generated gas makes the reaction mixture generate foam to form Uniform and fine cells. [0003] In modern general polyurethane technology, foam stabilizer (commonly used silicone surfactant) is an indispensable component, it plays the role of emulsifying foam material, stabilizing foam and regulating cells, it increases the interaction of various components Solubility, helps the formation of bubbles, controls the size and uniformity of the cells, promotes the balance of the gel tension of the foam cells, and makes the cell wall...

Claims

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Application Information

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IPC IPC(8): C08J9/30C08L75/04C08G77/46
Inventor 洪满心李丰富朱建军何运伟孙宇
Owner 南京美思德新材料有限公司
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