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Preparation method for improving mechanical property of polyurethane flame-retardant material

A flame retardant material, polyurethane technology, applied in the field of preparation of improving the mechanical properties of polyurethane flame retardant materials, can solve the problems of poor stability, large particle size of water-based polyurethane emulsion, etc., to improve compatibility, meet the needs of industrial use, and be environmentally friendly Effect

Active Publication Date: 2020-11-24
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-based polyurethane emulsion obtained by this method has a large particle size and poor stability.

Method used

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  • Preparation method for improving mechanical property of polyurethane flame-retardant material
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  • Preparation method for improving mechanical property of polyurethane flame-retardant material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method for improving the mechanical properties of polyurethane flame retardant materials, comprising the following steps:

[0042] 1) Preparation of melamine / polyurethane composite suspension

[0043] Dilute 0.20 kg of polyurethane emulsion in 100 kg of water, and stir for 3 hours at 40° C. with a stirring speed of 300 rpm to obtain a diluted polyurethane solution. Add 4kg of melamine and 100kg of water into the ultrasonic irradiation reactor, and ultrasonically disperse for 2 hours under the conditions of ultrasonic power of 300W, frequency of 300Hz, and 40°C to obtain a melamine dispersion; Under the condition of 12mL / min, slowly add the prepared melamine dispersion into the polyurethane solution to obtain a stable melamine / polyurethane composite suspension.

[0044] 2) Preparation of melamine / polyurethane composite masterbatch

[0045] The melamine / polyurethane composite suspension was washed by suction filtration, and dried to constant weight at a va...

Embodiment 2

[0049] A preparation method for improving the mechanical properties of polyurethane flame retardant materials, comprising the following steps:

[0050] 1) Preparation of melamine / polyurethane composite suspension

[0051] Add 0.50 kg of polyurethane emulsion and 300 kg of absolute ethanol into a three-necked flask, heat and stir for 3 hours at a temperature of 70° C. and a stirring speed of 400 rpm to obtain a diluted polyurethane solution.

[0052] Add 20kg of melamine and 400kg of water into an ultrasonic irradiation reactor, and ultrasonically disperse for 1.5 hours under the conditions of ultrasonic power of 400W, frequency of 400Hz, and temperature of 70°C to obtain a melamine solution.

[0053] 2) Preparation of melamine / polyurethane composite masterbatch

[0054] Add the obtained melamine solution to the diluted polyurethane solution to obtain a melamine / polyurethane composite suspension, and then dry it to constant weight at a vacuum degree of 0.1MPa and a temperature...

Embodiment 3

[0058] A preparation method for improving the mechanical properties of polyurethane flame retardant materials, comprising the following steps:

[0059] 1) Preparation of melamine / polyurethane composite suspension

[0060] Add 1kg of polyurethane emulsion and 800kg of DMF into the ultrasonic cleaning machine, start the ultrasonic cell pulverizer, the ultrasonic power is 10000W, the frequency is 20000Hz, the temperature is 30°C, and the ultrasonic dispersion time is 30 minutes to obtain a polyurethane dilute solution.

[0061] Add 30 kg of melamine and 800 kg of water into a three-necked flask, heat and stir for 4 hours at a temperature of 120° C. and a stirring speed of 300 rpm to obtain a melamine solution.

[0062] 2) Preparation of melamine / polyurethane composite masterbatch

[0063] The obtained melamine solution was added to the dilute polyurethane solution to obtain a melamine / polyurethane composite suspension, and the product was dried to constant weight at a vacuum deg...

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Abstract

The invention belongs to the field of composite materials, and particularly relates to a preparation method for improving the mechanical property of a polyurethane flame-retardant material. The methodcomprises the following steps: 1) preparing a melamine / polyurethane composite suspension; 2) preparing a melamine / polyurethane composite master batch; and 3) preparing the polyurethane flame-retardant material. According to the melamine / polyurethane composite flame retardant synthesized by coating melamine particles in a liquid phase with a polyurethane emulsion, the compatibility of the flame retardant powder and a polyurethane melt is greatly improved, and the prepared polyurethane composite material is excellent in flame retardant property and good in mechanical property and can meet industrial use requirements. According to the preparation method disclosed by the invention, a high-quality flame-retardant composite material product can be obtained, and the problems that the mechanicalproperty of polyurethane is greatly reduced and the wide application of polyurethane is limited due to the addition of a traditional flame retardant are solved. The method is simple in preparation process, relatively low in reaction temperature, easy to control and low in energy consumption; no waste gas or waste liquid is generated in the production process, and environment friendliness is achieved.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, in particular to a preparation method for improving the mechanical properties of polyurethane flame retardant materials. Background technique [0002] Polyurethane is the abbreviation of polyurethane, which is prepared by the reaction of polyol compound (R-OH) and isocyanate (R-N=C=O). By changing the raw materials of polyurethane and the ratio of polyol compound and isocyanate, the performance of polyurethane can be adjusted in a wide range, and materials with different physical properties such as density, elasticity, and rigidity can be obtained, mainly including elastomers, rubber, foam, Fibers, artificial leather, coatings, sealants, emulsions and waterproof materials, etc., are widely used in construction, transportation, petrochemical, medical, furniture and defense aviation and other fields. However, the flame retardancy of polyurethane is generally not good. The li...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08K13/02C08K5/3492C08J3/22
CPCC08J3/226C08J2375/04C08J2475/04C08K13/02C08K5/34922
Inventor 郑卓李刚夏和生唐印费国霞
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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