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 mo

Method used

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

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Example Embodiment

[0017]The present invention provides a method for preparing melamine formaldehyde-polyvinyl alcohol composite foam, including the following steps:

[0018]Melamine formaldehyde foam is soaked in a polyvinyl alcohol aqueous solution, and then saturated saturated, so soaking in a crosslinking agent solution, curing crosslinking to obtain melamine formaldehyde-polyvinyl alcohol composite foam material;

[0019]The polyvinyl alcohol is 60 ~ 99%, the molecular weight is from 10,000 to 250000, and the viscosity is 2.0 ~ 125.0 MPa · S;

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

[0021]The present invention provides an inexpensive melamine formaldehyde foam (MF) and polyvinyl alcohol (PVA) as a raw material, using a secondary amine group (-NH-) in the hydroxyl group (-OH) and MF foam material in PVA molecules. The chemical crosslinking reaction under the action of the c...

Example Embodiment

[0036]Example 1: Boric acid / Calcium chloride compound preparation melamine formaldehyde - polyvinyl alcohol complex foam:

[0037]Accurately weigh 10.0 g of polyvinyl alcohol (PVA) raw material (99% alcohol solution is 99%, molecular weight), add 90.0 g of deionized water, set the oil bath temperature 95 ° C, heat dissolved for 6 hours to prepare a concentration of 10.0% PVA aqueous solution It is weighed with 5.0 g of commercial melamine formaldehyde (MF) foam in the above PVA aqueous solution to adsorb adsorption, remove, rapidly transferred to 100 g of boric acid and 3.0 g of calcium chloride formulated 100 g 5.0% composite crosslinking agent solution, And put it on 80 ° C oven curing cross-linking 10h, removes the curing crosslinked melamine formaldehyde-polyvinyl alcohol foam, and the deionized water repeatedly washing the unreacted raw material PVA and crosslinking agent, and dried at 50 ° C for 6 h, collect The product, the label is MF-PVA-1, and the obtained sample is compres...

Example Embodiment

[0038]Example 2: Urea / Ethylene Aldaldehyde Preparation Melamine Formaldehyde - Polyvinyl Alcohol Composite Bubble:

[0039]Accurately weigh 15.0 g of polyvinyl alcohol (PVA) raw materials (alcohol solution of 95%, molecular weight 60000), add 85.0 g of deionized water, set the oil bath temperature 95 ° C, heat dissolved for 5 hours to prepare a concentration of 15.0% PVA aqueous solution It is weighing 5.0 g of a commercial melamine formaldehyde (MF) foam material in the above PVA aqueous solution adsorption, removal, rapid transfer to 100 g of 10.0% composite crosslinking agent for 5.0 g of urea and 5.0 g of glyoxal formulation, And put it in a 70 ° C oven curing cross-linking 24h, takes out the cured cross-linking melamine formaldehyde-polyvinyl alcohol foam, and the deionized water repeatedly washing the unreacted raw material PVA and crosslinking agent, and dried at 50 ° C for 6 h, collect The product, the label is MF-PVA-2, and the obtained sample is compressed, and the results ...

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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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