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A preparation method of self-reinforcing polyvinyl alcohol/modified starch biodegradable mulch film

A polyvinyl alcohol, biodegradable technology, used in flat products, applications, household appliances, etc., can solve the problems of difficult melt processing, poor plasticity, poor film tensile properties, etc., to achieve improved mechanical properties, enhanced mobility, guaranteed The effect of tensile strength

Active Publication Date: 2018-09-04
唐炜程
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the disadvantages of poor degradation effect, poor plasticity and difficulty in melt processing of general starch-based plastic mulches, as well as the disadvantages of the film obtained by the traditional method of modifying starch with polyvinyl alcohol, the film has poor tensile properties and is easily damaged during use. The invention proposes a preparation method of self-reinforced polyvinyl alcohol / modified starch biodegradable mulch film, thereby effectively avoiding the pasting problems of gel and agglomeration in starch crosslinking modification, and ensuring the tensile strength and other mechanical properties of the obtained mulch film. performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The polyvinyl alcohol / modified starch agricultural mulch film is prepared from the following raw materials in parts by weight: 47 parts of starch, 40 parts of polyvinyl alcohol, 5 parts of silicone polyurea, 6 parts of plasticizer, and 2 parts of crosslinking agent;

[0034] The particle size of the starch is 200 μm; the plasticizer is chlorinated paraffin; the crosslinking agent is benzoyl peroxide;

[0035] The steps of preparation are:

[0036] (1) Make a trial run of the high-pressure homogenizer to ensure that it is normal, add the pre-mixed uniform starch, silicone polyurea, plasticizer and crosslinking agent into the high-pressure homogenizer, and the mixture enters the pump body through the check valve , under the multiple actions of cavitation effect, turbulent flow and shearing, the starch is extruded, causing the internal tightly ordered molecular chains to be disrupted and rearranged, which reduces the crystallinity of the starch, and at the same time, the p...

Embodiment 2

[0040] The polyvinyl alcohol / modified starch agricultural mulch film is prepared from the following raw materials in parts by weight: 50 parts of starch, 40 parts of polyvinyl alcohol, 5 parts of silicone polyurea, 4 parts of plasticizer, and 1 part of crosslinking agent;

[0041] The particle size of the starch is 150 μm; the plasticizer is epoxy soybean oil; the crosslinking agent is triethylenetetramine;

[0042] The steps of preparation are:

[0043] (1) Make a trial run of the high-pressure homogenizer to ensure that it is normal, add the pre-mixed uniform starch, silicone polyurea, plasticizer and crosslinking agent into the high-pressure homogenizer, and the mixture enters the pump body through the check valve , under the multiple actions of cavitation effect, turbulent flow and shearing, the starch is extruded, causing the internal tightly ordered molecular chains to be disrupted and rearranged, which reduces the crystallinity of the starch, and at the same time, the p...

Embodiment 3

[0047] The polyvinyl alcohol / modified starch agricultural mulch film is prepared from the following raw materials in parts by weight: 57 parts of starch, 32 parts of polyvinyl alcohol, 5 parts of silicone polyurea, 4 parts of plasticizer, and 2 parts of crosslinking agent;

[0048] The particle size of the starch is 80 μm; the plasticizer is acetyl tributyl citrate; the crosslinking agent is dicumyl peroxide;

[0049] The steps of preparation are:

[0050] (1) Make a trial run of the high-pressure homogenizer to ensure that it is normal, add the pre-mixed uniform starch, silicone polyurea, plasticizer and crosslinking agent into the high-pressure homogenizer, and the mixture enters the pump body through the check valve , under the multiple actions of cavitation effect, turbulent flow and shearing, the starch is extruded, causing the internal tightly ordered molecular chains to be disrupted and rearranged, which reduces the crystallinity of the starch, and at the same time, the...

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Abstract

The invention provides a self-enhancement polyving akohol / modified starch biodegradable mulching film preparation method. According to the preparation method disclosed by the invention, a high-pressure homogenizer is utilized to modify starch under the existence of organosilicon polyurea, a plasticizer and a cross-linking agent to prepare cross-linked starch; then the cross-linked starch, polyvingakohol and glycerol are prepared into a mixed solution together; a high-strength agricultural mulching film is prepared by curtain coating and drying. The method can achieve the purposes of adjustinga modified starch crosslinking degree and disordering treatment at the same time through high-efficiency homogeneous mixing of the high-pressure homogenizer and can avoid the gelatinization problemsof gelatin, agglomeration and the like in cross-linking modification of starch; meanwhile, the organosilicon polyurea is pre-embedded into a starch cross-linking structure, and the organosilicon polyurea has a self-repairing function when the film has defects; thus, mechanical properties of tensile strength, tearing strength and the like of the film are remarkably improved; furthermore, a production speed is quick, cost is low, and popularization is achieved.

Description

technical field [0001] The invention relates to the field of agricultural mulching film preparation, in particular to high-pressure homogenizer modified starch and cast film formation, and in particular to a preparation method of self-reinforced polyvinyl alcohol / modified starch biodegradable mulch film. Background technique [0002] Agricultural mulch is an important agricultural production material after seeds, fertilizers, and pesticides. Its application has brought a revolution to agricultural production. Grass, disease and pest control, drought and waterlogging resistance, salt suppression and seedling preservation, improvement of light and heat conditions near the ground, making products hygienic and clean, etc. Agricultural mulching materials. It has made important contributions to increasing agricultural efficiency and increasing farmers' income, so it has developed rapidly and has broad prospects. [0003] While the agricultural mulch film is widely used in agricu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/04C08L29/04C08J5/18C08B31/00C08B30/16B29D7/01
CPCB29D7/01C08B30/16C08B31/003C08J5/18C08J2303/04C08J2429/04
Inventor 陈庆昝航
Owner 唐炜程