Preparation method of structural flame-retardant polyurethane soft foam

A technology of polyurethane flexible foam and structural flame retardant, applied in the field of polymer chemistry, can solve the problems of long production cycle, poor flame retardant effect, complicated process, etc., and achieve the effects of easy precipitation, low price and convenient operation.

Inactive Publication Date: 2015-12-30
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing a structural flame-retardant polyurethane soft foam, which solves the problem of structural flame-retardant polyurethane foam in the prior art. Polyurethane soft foam production cycle is long, the process is complicated, and the technical problems of poor flame retardant effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] (1) According to the mass ratio, weigh 8-12 parts of phenol into a 250mL four-neck flask and heat to melt, then add 0.005-0.2 parts of NaOH aqueous solution with a concentration of 10-20% by mass, and heat up to 50-70°C , add 15-20 parts of formaldehyde aqueous solution, react for 2-4 hours, and obtain a resole phenolic resin, then add 4-7 parts of melamine, react at a constant temperature until the mixture is clear and transparent, and obtain a liquid methylolated melamine-phenolic resin, and finally add 2~ 4 parts of glycerol, 0.8~1.8 parts of NaOH aqueous solution with a mass percentage concentration of 20~40% and 90~110 parts of epichlorohydrin, stirred and heated to 70~90°C, reacted at constant temperature for 15~30h, and raised the temperature to 110~130 ℃, vacuumize at -0.01~-0.1MPa for 1~2h, and then get the flame retardant polyether polyol with nitrogen structure. Its hydroxyl value is 51.6mgKOH / g, and its viscosity is 5866mPa.s / 25°C.

[0105] (2) In parts by ...

Embodiment 2

[0109] (1) According to the mass ratio, weigh 8-12 parts of phenol into a 250mL four-neck flask and heat to melt, then add 0.005-0.2 parts of NaOH aqueous solution with a concentration of 10-20% by mass, and heat up to 50-70°C , add 15-20 parts of formaldehyde aqueous solution, react for 2-4 hours, and obtain a resole phenolic resin, then add 4-7 parts of melamine, react at a constant temperature until the mixture is clear and transparent, and obtain a liquid methylolated melamine-phenolic resin, and finally add 2~ 4 parts of glycerol, 0.8~1.8 parts of NaOH aqueous solution with a mass percentage concentration of 20~40% and 90~110 parts of epichlorohydrin, stirred and heated to 70~90°C, reacted at constant temperature for 15~30h, and raised the temperature to 110~130 ℃, vacuumize at -0.01~-0.1MPa for 1~2h, and then get the flame retardant polyether polyol with nitrogen structure. Its hydroxyl value is 51.6mgKOH / g, and its viscosity is 5866mPa.s / 25°C.

[0110] (2) In parts by ...

Embodiment 3

[0114] (1) According to the mass ratio, weigh 8-12 parts of phenol into a 250mL four-neck flask and heat to melt, then add 0.005-0.2 parts of NaOH aqueous solution with a concentration of 10-20% by mass, and heat up to 50-70°C , add 15-20 parts of formaldehyde aqueous solution, react for 2-4 hours, and obtain a resole phenolic resin, then add 4-7 parts of melamine, react at a constant temperature until the mixture is clear and transparent, and obtain a liquid methylolated melamine-phenolic resin, and finally add 2~ 4 parts of glycerol, 0.8~1.8 parts of NaOH aqueous solution with a mass percentage concentration of 20~40% and 90~110 parts of epichlorohydrin, stirred and heated to 70~90°C, reacted at constant temperature for 15~30h, and raised the temperature to 110~130 ℃, vacuumize at -0.01~-0.1MPa for 1~2h, and then get the flame retardant polyether polyol with nitrogen structure. Its hydroxyl value is 51.6mgKOH / g, and its viscosity is 5866mPa.s / 25°C.

[0115] (2) In parts by ...

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Abstract

The invention provides a preparation method of structural flame-retardant polyurethane soft foam, which comprises the following steps: reacting phenol and formaldehyde to obtain a liquid resol, reacting with melamine to obtain a hydroxymethylated melamine-phenolic resin, initiating the ring-opening polymerization between the hydroxymethylated melamine-phenolic resin and epoxy chloropropane by using a co-initiator to obtain a nitrogenous structural flame-retardant polyether glycol, mixing the nitrogenous structural flame-retardant polyether glycol and other polyether glycols to obtain a base resin, adding a catalyst, a foam stabilizer, a flame retardant and a foaming agent to form a component A, quickly mixing with a component B isocyanate uniformly, pouring into a mold, and foaming to obtain the structural flame-retardant polyurethane soft foam. The limited oxygen index of the obtained foam is 28.1-29.3%, the maximum horizontal combustion velocity is not greater than 70mm/minute, the horizontal combustion time is 75-85 seconds, the average combustion length is less than 50mm, and the apparent density is 35.2-40.3 kg/m<3>.

Description

technical field [0001] The invention belongs to the field of macromolecule chemistry, and relates to a structural flame-retardant polyurethane flexible foam, in particular to a preparation method of a structural flame-retardant polyurethane flexible foam. Background technique [0002] Polyurethane flexible foam is referred to as polyurethane soft foam for short, and it is used in the largest amount in polyurethane products. Polyurethane soft foam mostly has an open-cell structure, which has the characteristics of light weight, softness, good resilience, low relative density, and high specific strength. Therefore, it is widely used as cushion materials for furniture, vehicle seats, etc., as well as sound insulation, Shockproof, heat insulation and other materials. Due to the unique internal molecular structure of polyurethane soft foam, it is extremely flammable in the air, and its oxygen index is generally 16-18%, which greatly increases the possibility of fire and fire dan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/50C08G65/28C08K5/521C08K3/22C08J9/14
CPCC08G18/482C08G18/5063C08G65/263C08G2101/00C08J9/144C08J2203/142C08J2375/08C08K3/22C08K5/521C08K7/24C08K2003/2224C08K2003/2227C08G2110/005
Inventor 贾润萍魏路吴久剑
Owner SHANGHAI INST OF TECH
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