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Polyurethane flexible foam and preparation method thereof

A polyurethane soft foam and prepolymer technology, applied in the field of polyurethane materials, can solve the problems of oily polyurethane foam surface, low bio-based content, low reactivity of plant polyols, etc.

Pending Publication Date: 2022-03-29
NANTONG HAIERMA TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently obtained vegetable oil-based polyurethane soft foam still has the defect of low bio-based content. If a large amount of vegetable oil polyols are added in the preparation process based on the purpose of increasing the bio-based content, due to the l

Method used

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  • Polyurethane flexible foam and preparation method thereof

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[0024] The invention provides a kind of preparation method of flexible polyurethane foam, comprises the following steps:

[0025] First mixing the first vegetable oil polyol and isocyanate to obtain a prepolymer; the molar ratio of -OH on the first vegetable oil polyol to -NCO on the isocyanate is 1:6-17;

[0026] The second vegetable oil polyol, polyether polyol, foam stabilizer, blowing agent and catalyst are mixed for the second time to obtain a premix;

[0027] After the third mixing of the prepolymer and the premix, foaming is performed to obtain the flexible polyurethane foam;

[0028] The mass ratio of the first vegetable oil polyol and the second vegetable oil polyol to the polyurethane flexible foam is (50-70): (95.8-143.5).

[0029] In the present invention, unless otherwise specified, all preparation materials are commercially available products well known to those skilled in the art.

[0030] In the present invention, the first mixing of the first vegetable oil p...

Embodiment 1

[0064] 1000g epoxy rapeseed oil (epoxy value 5.85%), 0.5g mass fraction are 85% phosphoric acid and 40g water join in autoclave and mix, then be heated to 95 ℃ and carry out ring-opening reaction, reaction pressure is 0.3MPa, and the reaction time is 5h; the obtained product is subjected to vacuum distillation to remove residual moisture and phosphoric acid, and then filtered to obtain a rapeseed oil-based polyol, the hydroxyl value of which is 102 mgKOH / g , the functionality is about 2;

[0065] Add 1000g of toluene diisocyanate to a reactor filled with nitrogen, heat it to 40°C at a speed of 100r / min, then add 350g of rapeseed oil-based polyol to the reactor at a speed of 20g / min, and heat up to 85 Insulate at ℃ for 1 hour, cool to obtain a prepolymer; the molar ratio of -OH on rapeseed oil-based polyol to -NCO on toluene diisocyanate is 1:16.43;

[0066] Mix 60g of rapeseed oil-based polyol, 40g of polyether 330N, 0.8g of silicone oil, 1.5g of deionized water and 1.8g of t...

Embodiment 2

[0069] 1000g epoxidized soybean oil (epoxy value 6.25%), 2.0g mass fraction are that 98% sulfuric acid and 200g water are added in the autoclave and mixed, then heated to 115°C to carry out the ring-opening reaction, the reaction pressure is 0.4MPa, the reaction time is 5h; the obtained product is subjected to vacuum distillation to remove residual moisture and sulfuric acid, and then filtered to obtain soybean oil-based polyol, the hydroxyl value of the soybean oil-based polyol is 216mgKOH / g, functionality about 4;

[0070] 1000g of diphenylmethane diisocyanate is added to a reactor filled with nitrogen, heated to 45°C at a speed of 150r / min, then 300g of soybean oil-based polyol is added to the reactor at a speed of 25g / min, and the temperature is raised to Insulate at 80°C for 1.5h, cool to obtain a prepolymer; the molar ratio of -OH on soybean oil-based polyol to -NCO on diphenylmethane diisocyanate is 1:6.67;

[0071] 55 g of soybean oil-based polyol, 45 g of polyether 3...

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Abstract

The invention belongs to the technical field of polyurethane materials, and particularly relates to polyurethane flexible foam and a preparation method thereof. The preparation method comprises the following steps: carrying out first mixing on first vegetable oil polyol and isocyanate to obtain a prepolymer; the molar ratio of-OH on the first vegetable oil polyol to-NCO on the isocyanate is 1: (6-17); second vegetable oil polyol, polyether polyol, a foam stabilizer, a foaming agent and a catalyst are subjected to second mixing, and a premix is obtained; and carrying out third mixing on the prepolymer and the premix, and foaming to obtain the polyurethane flexible foam, the ratio of the mass sum of the first vegetable oil polyol and the second vegetable oil polyol to the mass of the polyurethane flexible foam is (50-70): (95.8-143.5). The polyurethane flexible foam prepared by the preparation method provided by the invention has high bio-based content, can obviously reduce dependence on petrochemical products, and is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of polyurethane materials, and in particular relates to a flexible polyurethane foam and a preparation method thereof. Background technique [0002] Polyurethane soft foam is a kind of flexible polyurethane foam with certain elasticity. According to the degree of softness and hardness, that is, the difference in load resistance performance, polyurethane soft foam can be divided into ordinary soft foam, super soft foam, high load-bearing soft foam and high resilience soft foam; according to different production processes, polyurethane soft foam can be divided into Slab foam and molded foam. Polyurethane soft foam mostly has an open-cell structure, which has low density, good elastic recovery, sound absorption, breathability and heat preservation properties. It is mainly used as cushion materials for furniture, mattresses, and vehicle seat cushions. Polyurethane soft foam is used as filter material, sound in...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/36C08G18/10C08G101/00
CPCC08G18/6696C08G18/36C08G18/48C08G18/10C08G2110/0008C08G2110/0083C08G2101/00
Inventor 蔡启宏毋亭亭张莉春曹志亮俞杰邓健能
Owner NANTONG HAIERMA TECH CO LTD
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