A kind of starch-based foaming material and preparation method thereof

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

Active Publication Date: 2020-12-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because starch 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 the foam material The stability is very poor, and the foam material is not easy to rebound after being 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. After moisture absorption, the 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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  • A kind of starch-based foaming material and preparation method thereof
  • A kind of starch-based foaming material and preparation method thereof
  • A kind of starch-based foaming material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation of starch-based foaming material, concrete steps are as follows:

[0041] (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 down and discharging to obtain component A for subsequent use;

[0042] (2) In parts by weight, after stirring and mixing 100 parts of polyvinyl alcohol (PVA-2099), 5 parts of PPG-400 and 1 part of sodium bicarbonate, component B was obtained and set aside;

[0043] (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...

Embodiment 2

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

[0048] (1) In parts by weight, stir and mix 100 parts of tapioca starch (100 mesh), 4 parts of hydrogen peroxide, 2 parts of ferrous sulfate, 20 parts of water and 0.8 part of citric acid, and then heat to 80°C for oxidation reaction for 2 hours , cooling and discharging to obtain component A for subsequent use;

[0049] (2) In parts by weight, after stirring and mixing 100 parts of polyvinyl alcohol (PVA-1399), 15 parts of PPG-800 and 3 parts of sodium bicarbonate, component B was obtained and set aside;

[0050] (3) In parts by weight, 100 parts of A component, 20 parts of B component, 8 parts of sulfuramide, 5 parts of ethylene-acrylic acid copolymer (EAA, AA content is 40%) and 3 parts of talcum powder (5000 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 ratio is 6.0, and the l...

Embodiment 3

[0054] The preparation of starch-based foaming material, concrete steps are as follows:

[0055] (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;

[0056] (2) In parts by weight, after stirring and mixing 100 parts of polyvinyl alcohol (PVA-1799), 10 parts of PPG-600 and 2 parts of sodium bicarbonate, component B was obtained and set aside;

[0057] (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 3...

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Abstract

The invention discloses a starch-based foam material and a preparing method thereof. The preparing method comprises the steps of 1, stirring starch, hydrogen peroxide, ferrous sulfate, water and citric acid to be uniformly mixed, afterwards, heating to conduct an oxidizing reaction, and cooling for discharging to obtain a component A for use; 2, stirring polyvinyl alcohol (PVA), plasticizer and sodium bicarbonate to be uniformly mixed to obtain a component B for use; 3, stirring the component A, the component B, amide-type additives, ethylene-acrylic acid (EAA) and talcum powder to be uniformly mixed, extruding the mixture through a single screw extruder with a high compression ratio to be foamed and formed, and obtaining the starch-based foam material. The starch-based foam material has ahigh resilience rate and a high foaming ratio, and when the relative humidity is smaller than or equal to 50%, the compression resilience ratio is larger than or equal to 95%; when the relative humidity is larger than or equal to 90%, the compression resilience ratio is larger than or equal to 80%, and the overall foaming rate is larger 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 starch-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 bisphen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/10C08L29/04C08L71/02C08L23/08C08B31/18C08J9/08
CPCC08B31/18C08J9/0061C08J9/08C08J2203/02C08J2303/10C08J2423/08C08J2429/04C08J2471/02
Inventor 崔跃飞
Owner SOUTH CHINA UNIV OF TECH
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