Flame-retarding polyvinyl alcohol-based composite crosslinked aerogel-coating rigid polyurethane foam material and preparation method thereof

A polyvinyl alcohol-based, rigid polyurethane technology, applied in the direction of fireproof coatings, alginic acid coatings, coatings, etc., can solve the problems of reducing the mechanical properties of foam materials, high cost, complicated preparation process, etc., and achieve excellent smoke suppression, Reduces the effect of smoke and toxic gases

Inactive Publication Date: 2019-04-05
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The phase morphology of traditional additive flame retardants directly affects the compatibility with polyols, which will cause "collapse" in the process of RPUF molding to reduce the mechanical properties of foam materials; for the synthesis of flame retardant elements through chemical reactions The flame retardant is introduced into the PU molecular structure to endow the RPUF material with flame retardant properties and at the same time ensure that the physical and mechanical properties will not be affected. Therefore, this method is currently the most commonly used method for flame retardant RPUF materials; using microencapsulation New methods such as modifying the flame retardant first, adding the modified flame retardant to the preparation process of the RPUF material can significantly improve the thermal stability of the flame retardant and the compatibility with polyols, thereby significantly improving The flame retardant performance of the material, but this method has a complicated preparation process and high cost

Method used

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  • Flame-retarding polyvinyl alcohol-based composite crosslinked aerogel-coating rigid polyurethane foam material and preparation method thereof
  • Flame-retarding polyvinyl alcohol-based composite crosslinked aerogel-coating rigid polyurethane foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Prepare the RPUF sample by one-step free foaming method, weigh a certain amount of polyether polyol (4110), foaming agent and put it in a paper cup, stir at 2000rpm for 30s and mix well, then add a certain amount of isocyanate (MDI) and stir for 20s Finally, the mixture was quickly poured into a mold to obtain a freely foaming RPUF, and the RPUF material was aged at 80°C for 12 hours to prepare a rigid polyurethane foam sample.

[0017] Add 40g of polyvinyl alcohol into deionized water with a weight of 1000g of polyvinyl alcohol and heat to dissolve at 80°C, then add 40g of sodium alginate and 40g of montmorillonite and stir at high speed for 1 hour to make it fully gelled. solution, sodium alginate solution, and montmorillonite aqueous dispersion are 4wt%, 4wt%, and 4wt%, respectively, and the pH of the polyvinyl alcohol composite hydrogel is adjusted to 10 with ammonia water, and then compounded in polyvinyl alcohol Add 10 g of methyltrimethoxysilane dropwise to the h...

Embodiment 2

[0019] Firstly, RPUF samples were prepared by one-step free foaming. Weigh a certain amount of polyether polyol (4110), foaming agent and put it in a paper cup, stir at 2000rpm for 30s and mix well, then add a certain amount of isocyanate (MDI) and stir for 20s, then quickly pour the mixture into the mold, The freely foaming RPUF can be obtained, and the RPUF material is aged at 80° C. for 12 hours to prepare a rigid polyurethane foam sample.

[0020]Add 5g of polyvinyl alcohol into deionized water with a weight of 1000g of polyvinyl alcohol and heat to dissolve at 80°C, then add 10g of sodium alginate and 10g of montmorillonite and stir at high speed for 0.5 hours to make it fully gelled. solution, sodium alginate solution, and montmorillonite water dispersion by weight are 0.5wt%, 1wt% and 1wt%, respectively, using ammonia to adjust the pH of the polyvinyl alcohol composite hydrogel to be 9, and then Add 0.1g of methyltriethoxysilane dropwise to the composite hydrogel syste...

Embodiment 3

[0022] Firstly, RPUF samples were prepared by one-step free foaming. Weigh a certain amount of polyether polyol (4110), foaming agent and put it in a paper cup, stir at 2000rpm for 30s and mix well, then add a certain amount of isocyanate (MDI) and stir for 20s, then quickly pour the mixture into the mold, The freely foaming RPUF can be obtained, and the RPUF material is aged at 80° C. for 12 hours to prepare a rigid polyurethane foam sample.

[0023] Add 20g of polyvinyl alcohol into deionized water with a weight of 1000g of polyvinyl alcohol and heat to dissolve at 80°C, then add 40g of sodium alginate and 40g of montmorillonite and stir at high speed for 0.5 hours to make it fully gelled. solution, sodium alginate solution, and montmorillonite aqueous dispersion were 2wt%, 4wt%, and 4wt%, respectively, using ammonia to adjust the pH of the polyvinyl alcohol composite hydrogel to be 9, and then compounding the polyvinyl alcohol Add 10g of aminopropyl-aminoethyl-methyltrimet...

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Abstract

The invention discloses a flame-retarding polyvinyl alcohol-based composite crosslinked aerogel-coated rigid polyurethane foam material. A sol-gel process and silane hydrolyzing and crosslinking reactions are adopted to prepare composite polyvinyl alcohol / sodium alginate / montmorillonite crosslinked hydrogel for coating a surface of a rigid polyurethane foam material, and a freeze-drying process isadopted to prepare the flame-retarding polyvinyl alcohol-based composite crosslinked aerogel-coated rigid polyurethane foam material. The flame-retarding polyvinyl alcohol-based composite crosslinkedaerogel-coated rigid polyurethane foam material has the advantages of excellent flame-retarding performance, excellent smoke suppression capability, high limit oxygen index which reaches to 45.0% andsmall influences of a polyvinyl alcohol-based composite crosslinked aerogel coating on physical properties including foaming, heat insulating and the like of polyurethane, and thereby having an important application value in application fields of flame retarding and heat insulating.

Description

technical field [0001] The invention relates to a polyvinyl alcohol-based airgel-coated flame-retardant rigid polyurethane foam material, in particular to a flame-retardant polyvinyl alcohol-based composite cross-linked airgel-coated rigid polyurethane foam material and a preparation method thereof. Background technique [0002] Rigid polyurethane foam (RPUF) is a low-density porous structure material. It is widely used in the insulation layer of refrigerators due to its excellent comprehensive properties such as high mechanical properties, insulation properties, wear resistance, and low thermal conductivity. , building insulation materials, furniture cushions and other fields, it is the most widely used material in polyurethane products, and its output ranks second. With the increasing demand for RPUF, the requirements for RPUF are getting higher and higher. Since RPUF is very easy to ignite during use and the flame spreads rapidly after burning, which is a hidden danger t...

Claims

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Application Information

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IPC IPC(8): C08J9/42C09D129/04C09D105/04C09D5/18C08L75/08
CPCC09D105/04C09D129/04C08J9/42C09D5/18C08J2375/08C08J2429/04C08L2201/02C08L5/04C08K3/346C08L29/04
Inventor 吴宁晶夏明凤郎文超牛富堃于基航马小兵
Owner QINGDAO UNIV OF SCI & TECH
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