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A kind of preparation method of bio-based flame retardant and the method for preparing flame-retardant polyurethane foam

A polyurethane foam and flame retardant technology, which is applied in the preparation of sugar derivatives, sugar derivatives, sugar derivatives, etc., can solve the problems of poor flame retardancy, small addition, and affecting the mechanical properties of polyurethane foam, and achieve mechanical properties Balanced with flame retardant performance, excellent effect of flame retardant performance

Active Publication Date: 2021-11-09
临沂斯科瑞聚氨酯材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing intumescent flame retardants based on bio-based raw materials have poor flame retardancy, and their addition in polyurethane foam is small, so they cannot achieve excellent flame retardancy. When they are added in large amounts, they will seriously affect the performance of polyurethane foam. Various mechanical properties, thus severely limiting the application of bio-based intumescent flame retardants in the field of polyurethane foam

Method used

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  • A kind of preparation method of bio-based flame retardant and the method for preparing flame-retardant polyurethane foam
  • A kind of preparation method of bio-based flame retardant and the method for preparing flame-retardant polyurethane foam
  • A kind of preparation method of bio-based flame retardant and the method for preparing flame-retardant polyurethane foam

Examples

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Effect test

Embodiment 1

[0034] A preparation method of a bio-based flame retardant, comprising the following steps;

[0035] (1) After adding distilled water to the phytic acid aqueous solution with a mass fraction of 70% for dilution, continuously and slowly add sodium carbonate powder therein, after stirring evenly, until the pH value of the system is 7.0, stop adding sodium carbonate powder to obtain phytic acid Sodium aqueous solution, wherein the volume ratio of phytic acid aqueous solution and distilled water is 10:5;

[0036] (2) After mixing the tannic acid aqueous solution and ethylene glycol with a mass fraction of 5% according to the ratio of 3:1 by volume, then adding sodium phytate aqueous solution and 98% concentrated sulfuric acid aqueous solution to it , after the temperature was raised to 45°C in an oil bath, the reaction time was 3.5h, and the filter cake was repeatedly washed with distilled water for 3 times, and the white solid was collected and dried to obtain tannin phytate, ref...

Embodiment 2

[0038] A method for preparing a flame-retardant polyurethane foam with a bio-based flame retardant, comprising the following steps:

[0039](1) After mixing paraformaldehyde, ethylene glycol, melamine, and urea in a mass ratio of 1.0:2.0:3.3:1.0, raise the temperature of the mixture to 105°C, and keep it warm for 28 minutes. Add ammonium chloride, adjust the pH value of the system to 4.0, continue the reaction for 28 minutes, add diethanolamine to it, adjust the pH value of the system to 9.3, and continue the curing reaction at 80°C for 60 minutes to obtain ethylene glycol modified melamine Resin, referred to as EMF resin;

[0040] use 13 The C-NMR spectrum characterized the molecular microstructure of EMF. Such as figure 2 Shown, DMSO-d6 38.657~40.334, 46.907—NH— C h 2 —NH—, 49.899 C h 2 OH, 53.375—N(CH 2 —) — C h 2 NH—, 55.360—CO—NH C h 2 OCH 3 , 55.440—CO—N(CH 2 —) C h 2 OCH 3 , 55.644 —C=N—NHCH 2 o C h 3 (on the triazine ring), 56.382-C=N-N(CH 2 o C ...

Embodiment 3

[0044] In this example, when preparing the bio-based macromolecular intumescent flame retardant, the mass ratio of ethylene glycol-modified melamine resin to tannin phytate is 50:15, and the rest of the operation steps are exactly the same as in Example 2.

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Abstract

The invention discloses a preparation method of a bio-based flame retardant, which comprises the following steps: (1) After distilled water is added to the phytic acid aqueous solution for dilution, sodium carbonate powder is continuously and slowly added therein, and stirred evenly until the pH of the system is reached. After the value is 6.5-7.2, stop adding sodium carbonate powder to obtain sodium phytate aqueous solution; (2) After mixing the tannic acid aqueous solution and ethylene glycol according to the ratio of 3-4:1 by volume, add After sodium phytate aqueous solution and concentrated sulfuric acid aqueous solution, heat up to 40-50°C in an oil bath, react for 3-4 hours, filter with suction, wash the filter cake with distilled water repeatedly for 3 times, collect the white solid and dry it to obtain tannin phytate . The bio-based flame retardant prepared by the invention has excellent flame retardancy, has less influence on the mechanical properties of the polyurethane foam, and can balance the mechanical properties and flame retardancy of the polyurethane foam.

Description

technical field [0001] The invention relates to the technical field of flame retardant material preparation, in particular to a method for preparing a bio-based flame retardant and a method for preparing flame retardant polyurethane foam. Background technique [0002] Polyurethane Foam (PUF for short) is a polymer material containing repeated urethane chains in the molecular chain. Alcohol is a polymer formed by addition polymerization reaction under suitable catalyst and proper ratio. Polyurethane can be divided into two categories: hard and soft. Because of its excellent flexibility, mechanical strength, wear resistance and weather resistance, it occupies a very important position in the new material industry. Soft polyurethane mainly has a thermoplastic linear structure, which has excellent characteristics such as light weight, good elasticity, and low price, and is widely used in furniture, sound insulation, shockproof, and filtration materials. Rigid polyurethane foam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/65C08G18/62C08G18/54C08G18/50C08G18/32C08G12/40C07H1/00C07H13/08C08G101/00
CPCC07H1/00C07H13/08C08G12/40C08G18/4063C08G18/5024C08G18/544C08G18/6212C08G18/6535C08G18/6688C08G2101/00
Inventor 高明李永鹏岳丽娜李勇军周旋
Owner 临沂斯科瑞聚氨酯材料有限公司
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