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Preparation method of toughness-enhanced melamino-formaldehyde-polyvinyl alcohol composite foam material

A technology of melamine formaldehyde and polyvinyl alcohol, which is applied in the field of foam, can solve the problems of low water absorption, unfavorable mass production, cumbersome preparation process steps, etc., and achieve the effect of improved toughness and excellent damage resistance

Active Publication Date: 2021-02-23
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings are mainly manifested in the cumbersome preparation process steps, high requirements for process condition control, and difficulty in mass production.
Subsequently, Ma Haihong and others provided a method for preparing carbon fiber-reinforced high-closed-cell and low-water-absorption modified melamine-formaldehyde rigid foam. The compressive strength of modified melamine-formaldehyde foam is increased to 339-356kPa, but it is still low, and the introduction of carbon fiber increases the preparation cost of modified melamine-formaldehyde foam, which is not conducive to mass production

Method used

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  • Preparation method of toughness-enhanced melamino-formaldehyde-polyvinyl alcohol composite foam material

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preparation example Construction

[0017] The invention provides a kind of preparation method of melamine formaldehyde-polyvinyl alcohol composite foam material, comprises the following steps:

[0018] The melamine formaldehyde foam is soaked in the polyvinyl alcohol aqueous solution, after the absorption is saturated, then soaked in the crosslinking agent solution, solidifies and crosslinks, and obtains the melamine formaldehyde-polyvinyl alcohol composite foam material;

[0019] The degree of alcoholysis of the polyvinyl alcohol is 60-99%, the molecular weight is 10000-250000, and the viscosity is 2.0-125.0mPa·s;

[0020] The crosslinking agent is selected from one or more of urea, boric acid, citric acid, formic acid, formaldehyde, glyoxal, glutaraldehyde and calcium chloride.

[0021] The present invention provides and adopts commercially cheap melamine formaldehyde foam (MF) and polyvinyl alcohol (PVA) as raw material, utilizes the secondary amine group (-NH-) in the hydroxyl (-OH) in the PVA molecule and ...

Embodiment 1

[0036] Embodiment 1: boric acid / calcium chloride compound preparation melamine formaldehyde-polyvinyl alcohol composite foam:

[0037]Accurately weigh 10.0g polyvinyl alcohol (PVA) raw material (alcoholysis degree is 99%, molecular weight 10000), add 90.0g deionized water, set the oil bath temperature at 95°C, heat and dissolve for 6 hours to prepare a 10.0% PVA aqueous solution , take by weighing 5.0g commercialization melamine formaldehyde (MF) foam material and fully soak and absorb in the above-mentioned PVA aqueous solution, take out, transfer rapidly to in the 100g 5.0% composite linking agent solution prepared by 2.0g boric acid and 3.0g calcium chloride, And put it in an oven at 80°C for curing and crosslinking for 10 hours, take out the cured and crosslinking melamine formaldehyde-polyvinyl alcohol foam material, wash it repeatedly with deionized water to remove unreacted raw material PVA and crosslinking agent, and dry it in an oven at 50°C for 6 hours, collect The p...

Embodiment 2

[0038] Embodiment 2: urea / glyoxal compound preparation melamine formaldehyde-polyvinyl alcohol composite foam:

[0039] Accurately weigh 15.0g polyvinyl alcohol (PVA) raw material (alcoholysis degree is 95%, molecular weight 60000), add 85.0g deionized water, set the oil bath temperature at 95°C, heat and dissolve for 5 hours to prepare a 15.0% PVA aqueous solution , take by weighing 5.0g commercialization melamine formaldehyde (MF) foam material and fully soak and absorb in the above-mentioned PVA aqueous solution, take out, transfer to rapidly in the 100g 10.0% composite linking agent solution prepared by 5.0g urea and 5.0g glyoxal, And put it in a 70°C oven to cure and crosslink for 24 hours, take out the cured and crosslinked melamine formaldehyde-polyvinyl alcohol foam material, wash it repeatedly with deionized water to remove unreacted raw material PVA and crosslinking agent, and dry it in a 50°C oven for 6 hours, collect The product, marked as MF-PVA-2, was subjected t...

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Abstract

The invention provides a preparation method of a toughness-enhanced melamino-formaldehyde polyvinyl alcohol composite foam material, which comprises the following steps: soaking melamino-formaldehydefoam in a polyvinyl alcohol water solution, adsorbing to be saturated, soaking in a crosslinking agent solution, curing and crosslinking to obtain the melamino-formaldehyde polyvinyl alcohol compositefoam material, and drying to obtain the toughness-enhanced melamino-formaldehyde polyvinyl alcohol composite foam material, wherein the alcoholysis degree of the polyvinyl alcohol is 60-99%, the molecular weight of the polyvinyl alcohol is 10000-250000, the viscosity of the polyvinyl alcohol is 2.0-125.0 mPa.s, and the cross-linking agent is selected from one or more of urea, boric acid, citric acid, formic acid, formaldehyde, glyoxal, glutaraldehyde and calcium chloride. The composite foam material with an interpenetrating cross-linked network structure is constructed by utilizing a chemicalcross-linking reaction of hydroxyl (-OH) in PVA molecules and a secondary amine group (-NH-) in the MF foam material under the action of the cross-linking agent through physical adsorption and chemical cross-linking treatment, the toughness of the composite foam material is remarkably improved, and the composite foam material has excellent damage resistance.

Description

technical field [0001] The invention belongs to the field of foam technology, in particular to a method for preparing a toughness-enhanced melamine formaldehyde-polyvinyl alcohol composite foam material. Background technique [0002] Melamine Formaldehyde resin (Melamine Formaldehyde, MF), referred to as MF, is one of the earlier industrialized chemical products. Among them, the melamine-formaldehyde foam material is a kind of foam plastic material obtained by foaming melamine and formaldehyde solution under alkaline conditions. It has low apparent density, high open cell ratio, high solution absorption and excellent flame retardancy. , heat resistance, sound absorption and heat preservation and other properties. However, the acquisition of melamine formaldehyde resin is achieved by cross-linking each other through methylene or dimethylene ether bonds. There are triazine rings with larger steric hindrances at both ends of the methylene groups, and multiple methylene groups ...

Claims

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Application Information

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IPC IPC(8): C08J9/42C08J9/40C08L61/28C08L29/04C08K3/38C08K3/16C08K5/21C08K5/07C08K5/092C08K5/09
CPCC08J9/40C08J9/42C08J2361/28C08J2429/04C08K3/38C08K5/07C08K5/09C08K5/092C08K5/21C08K2003/162
Inventor 王宝龙姬相玲郑润许玖多石凯沙迪
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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