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Corn starch-based foaming material and preparation method thereof

A technology of corn starch and foaming materials, which is applied in the field of corn starch-based foaming materials and its preparation, can solve the problems of poor resilience, not easy to rebound, poor stability of foam materials, etc., and achieve fine and uniform foam structure, which is not easy to Deformation and collapse, the effect of high cell wall strength

Inactive Publication Date: 2019-03-19
JIAXING BOFA NEW PLASTIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because cornstarch has extremely strong polarity and hydrophilicity, after foaming, on the one hand, most of its foam structure is an open-cell or semi-open-cell structure, and it is not easy to form a closed-cell structure, so foam materials The stability of the foam material is very poor, and it is not easy to rebound after the foam material is compressed by force, and the resilience is generally poor; especially its polarity and hydrophilicity are extremely strong, and it is easy to absorb moisture in the use environment, and cornstarch foams After the material absorbs moisture, its foam structure is more likely to collapse and shrink, and at the same time completely loses the resilience of the foam material, thus losing all the functions and values ​​of the foam material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation of cornstarch-based foaming material, concrete steps are as follows:

[0036] (1) In parts by weight, stir and mix 100 parts of corn starch (80 mesh), 2 parts of hydrogen peroxide, 1 part of ferrous sulfate, 15 parts of water and 0.5 part of citric acid, and heat to 60°C for 4 hours of oxidation reaction , cooling and discharging to obtain component A for subsequent use;

[0037] (2) In parts by weight, after stirring and mixing 90 parts of polyvinyl alcohol (PVA-2099), 5 parts of PPG-400 and 1 part of sodium bicarbonate, component B was obtained and set aside;

[0038] (3) In parts by weight, 100 parts of component A, 10 parts of component B, 3 parts of carbonamide, 2 parts of ethylene-acrylic acid copolymer (EAA, AA content is 32%) and talcum powder (8000 mesh) 1 After the parts are stirred and mixed evenly, they are extruded and foamed by a single-screw extruder with a high compression ratio (the compression ratio is 4.5, and the length-to-diameter r...

Embodiment 2

[0041] The preparation of cornstarch-based foaming material, concrete steps are as follows:

[0042] (1) In parts by weight, stir and mix 100 parts of corn starch (120 mesh), 6 parts of hydrogen peroxide, 3 parts of ferrous sulfate, 30 parts of water and 1.0 part of citric acid, and heat to 75°C for 3 hours of oxidation reaction , cooling and discharging to obtain component A for subsequent use;

[0043] (2) In parts by weight, after stirring and mixing 90 parts of polyvinyl alcohol (PVA-1799), 10 parts of PPG-600 and 2 parts of sodium bicarbonate, component B was obtained and set aside;

[0044] (3) In parts by weight, 100 parts of component A, 15 parts of component B, 5 parts of dicyandiamide, 3 parts of ethylene-acrylic acid copolymer (EAA, AA content is 36%) and talcum powder (6000 mesh) After the 2 parts are stirred and mixed evenly, they are extruded and foamed by a single-screw extruder with a high compression ratio (compression ratio is 5.0, length-to-diameter ratio is ...

Embodiment 4

[0047] The preparation of cornstarch-based foaming material, concrete steps are as follows:

[0048] (1) In parts by weight, 100 parts of corn starch (100 mesh), 5 parts of hydrogen peroxide, 1.5 parts of ferrous sulfate, 25 parts of water and 0.5 part of citric acid were stirred and mixed evenly, and then heated to 70°C for oxidation reaction for 4 hours , cooling and discharging to obtain component A for subsequent use;

[0049] (2) In parts by weight, after stirring and mixing 90 parts of polyvinyl alcohol (PVA-2499), 15 parts of PPG-400 and 2 parts of sodium bicarbonate, component B was obtained and set aside;

[0050] (3) In parts by weight, 100 parts of A component, 12 parts of B component, 6 parts of carbonamide, 4 parts of ethylene-acrylic acid copolymer (EAA, AA content is 30%) and 2 parts of talcum powder (10000 mesh) After the parts are stirred and mixed evenly, they are extruded and foamed by a single-screw extruder with a high compression ratio (the compression r...

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Abstract

The invention discloses a corn starch-based foaming material and a preparation method thereof. The preparation method includes the steps: (1) uniformly stirring and mixing starch, hydrogen peroxide, ferrous sulfate, water and citric acid, heating mixture to perform oxidation reaction, and cooling and discharging the mixture to obtain a component A for standby application; (2) uniformly stirring and mixing polyvinyl alcohol (PVA), plasticizers and sodium hydrogen carbonate to obtain a component B for standby application; (3) uniformly stirring and mixing the component A, the component B, amideadditives, ethylene-acrylic acid (EAA) copolymers and talcum powder, extruding mixture by a single screw extruder with high compression ratio to obtain the starch-based foaming material. The starch-based foaming material has high resilience ratio and foaming ratio, the compression resilience ratio is higher than or equal to 95% when relative humidity is lower than or equal to 50%, the compressionresilience ratio is higher than or equal to 80% when relative humidity is higher than or equal to 90%, and the overall foaming ratio is higher than or equal to 25 times.

Description

technical field [0001] The invention relates to the technical field of foam material preparation, in particular to a cornstarch-based foam material and a preparation method thereof. Background technique [0002] As we all know, foam plastics are widely used in the field of cushioning and protection packaging due to their advantages such as light weight, shock absorption, heat insulation, and sound absorption. At present, foamed plastics have become one of the most important and widely used varieties of plastic products, but the most widely used packaging materials for cushioning protection are non-degradable polystyrene foam (EPS), polypropylene foam (EPP ), polyethylene foam (EPE), and polyurethane foam materials, etc. These materials are chemically stable, acid and alkali resistant, and are not easy to degrade in the natural environment. With the increase of waste, they will cause serious "white pollution" to the environment , Even toxic and harmful substances such as bis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/08C08L3/10C08L29/04C08L23/08C08K5/20C08K3/34
CPCC08J9/08C08J9/0028C08J9/0066C08J2203/02C08J2303/10C08J2423/08C08J2429/04
Inventor 陈福珍
Owner JIAXING BOFA NEW PLASTIC CO LTD
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