Yellowing resistant the polyurethane foam and preparation method thereof

A polyurethane foam and anti-yellowing technology, applied in the field of polyurethane foam, can solve problems such as yellowing of polyurethane foam materials, generation of toluenediamine or diaminodiphenylmethane, and poor weather resistance of aromatic functional groups. Achieve enhanced yellowing resistance, improve yellowing resistance, improve hydrolysis resistance and thermal stability

Inactive Publication Date: 2015-07-08
昆山力普电子橡胶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used aromatic diisocyanates, such as toluene diisocyanate or diphenylmethane diisocyanate, have poor weather resistance and are easy to be oxidatively cracked due to the aromatic functional groups contained therein, making polyurethane foam materials in high humidity and high heat environ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, the complex polyol composed of polyether polyol (propylene oxide-ethylene oxide copolyether triol) and vegetable oil polyol (Polyol-206) accounting for 5% of the mass of polyether polyol, with the mass of complex polyol Based on 20-80% aliphatic isocyanate (4,4'-dicyclohexylmethane diisocyanate), 1% crosslinking agent (ethylene glycol), 0.5% catalyst (BiCat8108), 0.4% blowing agent (water), 0.6% foam stabilizer (DARCO DC193 simethicone), 0.8% essential oil (tea tree essential oil) were stirred at 1500-3000 rpm for 3-5 minutes at high speed to obtain an emulsified foaming mixture. Next, the foaming mixture is put into foaming at 100-120° C. for one day or at room temperature for one week, and then the foam precursor is matured for 24 hours. Finally, the foam precursor is placed in a buffer solution with a pH value of 3, the immersion temperature is 25°C, and the immersion time is 15 minutes. The buffer solution consists of a metal chelating agent (phosphoric acid)...

Embodiment 2

[0027] First, the complex polyol composed of polyether polyol (propylene oxide-ethylene oxide copolyether triol) and vegetable oil polyol (Polyol-206) accounting for 30% of the mass of polyether polyol, with the mass of complex polyol Based on 20-80% aliphatic isocyanate (4,4'-dicyclohexylmethane diisocyanate), 6% crosslinking agent (ethylene glycol), 2.5% catalyst (BiCat8108), 8% blowing agent (water), 2.4% foam stabilizer (DARCO DC193 simethicone), 5% essential oil (tea tree essential oil) and high-speed stirring at 1500-3000 rpm for 3-5 minutes to obtain an emulsified foaming mixture. Next, the foaming mixture is put into foaming at 100-120° C. for one day or at room temperature for one week, and then the foam precursor is matured for 24 hours. Finally, the foam precursor is placed in a buffer solution with a pH value of 4, the immersion temperature is 40°C, and the immersion time is 5 minutes. The buffer solution consists of a metal chelating agent (phosphoric acid) and a ...

Embodiment 3

[0029] First, the complex polyol composed of polyether polyol (propylene oxide-ethylene oxide copolyether triol) and vegetable oil polyol (Polyol-206) accounting for 18% of the mass of polyether polyol, with the mass of complex polyol Based on 50% aliphatic isocyanate (4,4'-dicyclohexylmethane diisocyanate), 3.5% crosslinking agent (ethylene glycol), 1.5% catalyst (BiCat8108), 4.2% blowing agent (water), 1.5% Foam stabilizer (DARCO DC193 simethicone oil), 2.9% essential oil (tea tree essential oil) was stirred at 1500-3000 rpm for 3-5 minutes at high speed to obtain an emulsified foaming mixture. Next, the foaming mixture is put into foaming at 100-120° C. for one day or at room temperature for one week, and then the foam precursor is matured for 24 hours. Finally, the foam precursor is placed in a buffer solution with a pH value of 5, the immersion temperature is 32°C, and the immersion time is 10 minutes. The buffer solution consists of a metal chelating agent (phosphoric acid...

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PUM

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Abstract

The invention discloses a yellowing resistant the polyurethane foam. The polyurethane foam contains composite polyols, and further comprises, with the weight of the polyols as benchmark, 20-80% of aliphatic isocyanate, 1%-6% of a crosslinking agent, 0.5-2.5% of a catalyst, 0.4-8% of a foaming agent, 0.6-2.4% of a foam stabilizer, and 0.8-5% of essential oil; the composite polyols comprises polyether glycol and vegetable oil polyols accounting for 5-30% of the polyether glycol. The polyurethane foam uses aliphatic isocyanate as an isocyanate monomer, avoids oxidized cracking of aromatic isocyanate and improves the yellowing resistance of the foam; the compound polyether glycol and vegetable oil polyols are used as polyols monomers, the vegetable oil polyols can effectively improve the hydrolysis resistance and thermal stability of the foam; and the essential oil can endow the foam with sterilization and ability to purify air. A preparation method adopts a buffer solution containing acid for impregnation, so that the yellowing resistance of the treated foam is further enhanced.

Description

technical field [0001] The invention relates to the technical field of polyurethane foam, in particular to a yellowing-resistant polyurethane foam and a preparation method thereof. Background technique [0002] Polyurethane foam material is a polymer formed by reacting diisocyanate compound with polyol (polyol), and then foamed and matured to form a foam material. According to the needs of different industries, the addition amount of each reagent and the process parameters can be adjusted to produce various polyurethane foam materials with different characteristics, so that polyurethane foam materials can be widely used in textiles, furniture, In construction, packaging, electronics and other industries, it has become a very important livelihood and industrial material. [0003] Polyurethane foam materials in the prior art generally use aromatic diisocyanates as diisocyanate compounds, and react them with polyols to prepare polyurethane foam materials in one step. Common...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/48C08G18/36C08J9/08C08G101/00
CPCC08G18/36C08G18/4837C08G18/6674C08G18/6696C08G18/758C08J9/40C08J2375/08C08K5/0058C08G2110/0083
Inventor 刘勇徐俊
Owner 昆山力普电子橡胶有限公司
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