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Polyvinyl alcohol polarity sponge plastics and method of producing the same

A technology of polyvinyl alcohol and foamed plastics, applied in the field of foamed plastics or polymer foaming materials, can solve the problems of long production cycle, complicated process, and restrictions on the application of polyvinyl alcohol foamed materials, and achieve the effect of strong adaptability

Active Publication Date: 2008-04-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned polyvinyl alcohol adopts the solution mechanical foaming method or chemical foaming method, the process is complex, the production cycle is long, and there are chemical foaming agents or acetal residues, which limit the application of polyvinyl alcohol foam materials and cannot prepare polyvinyl alcohol block foam

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 2kg of polyethylene oxide and 2kg of glutaraldehyde into 15kg of tap water and stir evenly, add 45kg of polyvinyl alcohol pellets with a degree of polymerization of 900 and a degree of alcoholysis of 92mol.%. Swelling, after fully swelling, add 2kg of calcium carbonate and 20kg of hydroxymethyl cellulose, mix evenly, melt and extrude foaming in an extruder at a temperature of 170°C to prepare a polyvinyl alcohol foam sheet.

Embodiment 2

[0028] Add 0.5kg of citric acid, 0.5kg of borax and 5kg of urea into 40kg of distilled water and stir evenly, add 50kg of polyvinyl alcohol pellets with a degree of polymerization of 900 and a degree of alcoholysis of 99mol.%. Swelling, after fully swelling, add 5kg of silicon dioxide, 4kg of ammonium oleate and 15kg of activated carbon, mix evenly, and prepare polyvinyl alcohol foamed beads in a hot press at a temperature of 140°C.

Embodiment 3

[0030] Add 5kg of sodium benzoate and 1kg of boric acid into 45kg of tap water and mix evenly, add 55kg of polyvinyl alcohol pellets with a degree of polymerization of 1750 and a degree of alcoholysis of 95mol.%, and fully swell in a closed container at 40°C under stirring. Finally, add 2kg of montmorillonite, 5kg of polyethylene wax, 5kg of stearic acid amide and 30kg of starch. After mixing evenly, melt extrusion-foaming in an extruder at a temperature of 160°C to prepare a polyvinyl alcohol foam sheet .

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PUM

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Abstract

The present invention provides poly vinyl alcohol polar foam. Water is used as foamer and plasticizer. According to weight, water is 15 portion to 55 portion, and poly vinyl alcohol is 45 portion to 85 portion. The material are dissolved for expansion, melted and processed for foaming. The melting and processing foaming comprises a melting and extruding continuous foaming method and a molding foaming method. The poly vinyl alcohol polar foam is a plate material, sheet material, membrane or bead or square block. The poly vinyl alcohol polar foam of the present invention can be added with crosslinker, molecular composite agent, processing aid, nucleating agent and functional additive. According to the weight portion, the crosslinker is 0 portion to 2 portion, the molecular composite agent 0 portion to 10 portion, the processing aid 0 portion to 10 portion, the nucleating agent 0 portion to 5 portion and the functional additive 0 portion to 30 portion. When the poly vinyl alcohol polar foam of the present invention is used as heavy metal particles, adsorption, filtration and separation material of organic pollutant, the poly vinyl alcohol polar foam has the characteristics of rapid adsorption, easy desorption and capacity of being repeatedly washed.

Description

technical field [0001] The invention belongs to the field of foamed plastics or polymer foamed materials, in particular to a polyvinyl alcohol polar foamed plastic and a preparation method thereof. Background technique [0002] Heavy metal ions and organic pollutants in industrial and domestic wastewater have caused great pollution to the environment, and there is an urgent need for efficient and environmentally friendly separation materials and technologies. Existing polymer foam materials such as polyethylene, polypropylene, and polystyrene foam are non-polar foams with poor adsorption and separation effects. Generally, polar groups or bonded catalysts are introduced through chemical modification, and the preparation process is complicated. The cost is high, and it is difficult to make foam materials by melt processing. [0003] Polyvinyl alcohol (PVA) is a general-purpose polymer material with excellent performance and strong hydrogen bonds. my country has formed an annu...

Claims

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Application Information

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IPC IPC(8): C08J9/04C08J9/12C08L29/04C08K5/56C08K5/3492C08K5/09C08K3/00
Inventor 王琪李莉史浩彭贤宾
Owner SICHUAN UNIV
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