Preparation method of polyvinyl alcohol foamed plastics

A technology for polyvinyl alcohol and foamed plastics, which is applied in the field of preparation of polyvinylalcohol foamed plastics, can solve problems such as health hazards and environmental pollution of employees, and achieve the effects of saving food resources, high flexibility, and a wide range of sources.

Inactive Publication Date: 2015-10-07
SHENZHEN POLYTECHNIC
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  • Abstract
  • Description
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Problems solved by technology

[0003] The object of the present invention is to provide a method for preparing polyvinyl alcohol foamed plastics, whic

Method used

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Embodiment Construction

[0020] Because the cross-linking agent formaldehyde used in the preparation process of the existing polyvinyl alcohol foam is very harmful to the human body, the impact of formaldehyde on the health of practitioners is mainly to cause irritation symptoms to the eyes, pharynx, nose and other organs. And the frequency of occurrence is closely related to the concentration of formaldehyde in the air. In addition, formaldehyde can also cause dizziness, headache, insomnia and other neurasthenic syndromes, skin allergies and other respiratory irritation symptoms except coughing; (2) use starch as a pore forming agent , After the foaming is completed, it must be washed away as waste, wasting precious food resources; (3) After the reaction, washing off the incompletely reacted formaldehyde, acid and starch requires a large amount of clean water, and the follow-up treatment process is longer . At the same time, the discharge of a large amount of sewage will cause serious water pollution...

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Abstract

The invention relates to the manufacturing of a material, and particularly to a preparation method of polyvinyl alcohol foamed plastics. The preparation method comprises the following steps: A, dissolving a given amount of polyvinyl alcohol; B, adding a dispersed framework material; C, stirring until uniformly mixed; D, adding additives; E, stirring and foaming; F, pouring into a mould, and drying. The polyvinyl alcohol foamed plastics prepared in the method adopt natural fibers as a framework raw material, the mechanical performance and degradation performance of foams can be improved; meanwhile, the source of straws and grass is wide, the cost is low, the starch used as a hole-forming agent is avoided, the grain resource is saved, reagents harmful to the human body such as formaldehyde are not used in the preparation process of the material, the environment-friendly preparation requirement can be met, the material foaming rate is relatively high, is 2 to 4 times and can be controlled by virtue of the content of the foaming agent and the stirring time, the softness adjusting rate of the material is high and can be adjusted by controlling the content of the plasticizer, and various buffer packaging materials meeting different requirements can be prepared.

Description

technical field [0001] The invention relates to material preparation, in particular to a preparation method of polyvinyl alcohol foamed plastics. Background technique [0002] The production process of foamed PVA is usually to add PVA and water in a reactor equipped with stirring and temperature control devices, and heat up to the complete dissolution of PVA under stirring; then cool, add crosslinking agent, foaming agent, acid Wait until fully mixed, pour into the mold, and heat-preserve and solidify in an oven at 50°C; after taking it out, wash off the unreacted cross-linking agent and acid to obtain a foamed plastic. The required raw materials generally include PVA, crosslinking agent (generally formaldehyde), acid catalyst (sulfuric acid, hydrochloric acid, etc.), surfactant (sodium n-dodecyl sulfate, polyethylene oxide tridecyl ether, etc.), Foaming agent (carbonate, etc.), nucleating agent (starch, etc.) and water, in order to improve some properties of foam products,...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L29/04C08K13/02C08K3/26C08K3/38C08K5/42C08J9/04
Inventor 王冬梅邹元虎柏子游
Owner SHENZHEN POLYTECHNIC
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