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High-heat-resistance degradable modified polystyrene foam packaging material and preparation method thereof

A polystyrene foam, foam packaging technology, applied in the sustainable packaging industry, biological packaging, climate sustainability, etc., can solve the problem of food that cannot be packaged at high temperature, polystyrene is difficult to be degraded, and the mechanical properties of materials are degraded. and other problems, to achieve the effect of improving degradability, good heat resistance and good degradability

Active Publication Date: 2020-10-13
安徽裕河新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But at the same time, the following problems of polystyrene foam have caused great restrictions on its application: (1) polystyrene is difficult to degrade, and traditional methods such as landfill, incineration, and recycling cannot completely solve its impact on the ecological environment. (2) Polystyrene foam will undergo thermal deformation above 80°C, and it cannot pack food with too high temperature, nor is it suitable for microwave heating; (3) Polystyrene foam can be heated under high temperature or ultraviolet light. Oxidative aging will occur, and chromogenic groups will be generated on the molecular chain, causing the foam material to turn yellow. With the increase of aging time, the molecular chain will break, and the mechanical properties of the material will also decrease.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A highly heat-resistant and degradable modified polystyrene foam packaging material, comprising the following raw materials: 885g styrene, 100g alkenyl graft modified starch, 15g rosmarinic acid modified tetravinyltetraphenyl-POSS.

[0044] The preparation process of above-mentioned alkenyl graft modified starch is as follows:

[0045] Mix 200g of starch and 20g of maleic anhydride, stir and react at 75°C for 3h; after the reaction, cool down, add acetone, and filter under reduced pressure to remove unreacted maleic anhydride.

[0046] The preparation process of above-mentioned rosmarinic acid modified tetravinyltetraphenyl-POSS is as follows:

[0047] 1) Preparation of tetravinyltetraphenyl-POSS:

[0048] 1.1) Mix 200g trimethoxyphenylsilane, 40g sodium hydroxide, 1L isopropanol, and 20mL water, and react at 25°C for 10 hours; after the reaction, filter, wash with isopropanol and methanol, and dissolve in ether , then add n-hexane, and dry the separated precipitate; ...

Embodiment 2

[0060] A highly heat-resistant degradable modified polystyrene foam packaging material, comprising the following raw materials: 855g styrene, 125g alkenyl graft modified starch, 20g rosmarinic acid modified tetravinyltetraphenyl-POSS.

[0061] The preparation process of above-mentioned alkenyl graft modified starch is as follows:

[0062] Mix 200g of starch and 25g of maleic anhydride, stir and react at 80°C for 2.5h; after the reaction, cool down, add acetone, and filter under reduced pressure to remove unreacted maleic anhydride.

[0063] The preparation process of above-mentioned rosmarinic acid modified tetravinyltetraphenyl-POSS is as follows:

[0064] 1) Preparation of tetravinyltetraphenyl-POSS:

[0065] 1.1) Mix 200g trimethoxyphenylsilane, 40g sodium hydroxide, 1L isopropanol, and 20mL water, and react at 25°C for 10 hours; after the reaction, filter, wash with isopropanol and methanol, and dissolve in ether , then add n-hexane, and dry the separated precipitate;

...

Embodiment 3

[0078] A highly heat-resistant and degradable modified polystyrene foam packaging material, comprising the following raw materials: 825g styrene, 150g alkenyl graft modified starch, 25g rosmarinic acid modified tetravinyltetraphenyl-POSS.

[0079] The preparation process of above-mentioned alkenyl graft modified starch is as follows:

[0080] Mix 200g of starch and 30g of maleic anhydride, stir and react at 85°C for 3h; after the reaction, cool, add acetone, and filter under reduced pressure to remove unreacted maleic anhydride.

[0081] The preparation process of above-mentioned rosmarinic acid modified tetravinyltetraphenyl-POSS is as follows:

[0082] 1) Preparation of tetravinyltetraphenyl-POSS:

[0083] 1.1) Mix 200g trimethoxyphenylsilane, 40g sodium hydroxide, 1L isopropanol, and 20mL water, and react at 25°C for 10 hours; after the reaction, filter, wash with isopropanol and methanol, and dissolve in ether , then add n-hexane, and dry the separated precipitate;

[0...

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Abstract

The invention relates to the field of packaging materials, and discloses a high-heat-resistance degradable modified polystyrene foam packaging material and a preparation method thereof. The foam packaging material is prepared from styrene, alkenyl graft modified starch and rosmarinic acid modified tetravinyl tetraphenyl-POSS as raw materials through the following steps: (1) mixing a dispersing agent with water, adding an initiator and styrene, uniformly dispersing, and reacting at 90-100 DEG C for 1-2 hours; (2) adding alkenyl graft modified starch and rosmarinic acid modified tetravinyl tetraphenyl-POSS, uniformly mixing, reacting for 4-6 hours at 100-120 DEG C, and drying to obtain modified polystyrene particles; and (3) foaming and curing the modified polystyrene particles to obtain themodified polystyrene foam packaging material. The foam packaging material provided by the invention has good degradability, heat resistance and oxidation resistance, can be used for packaging food with high temperature, is not easy to age, and has small decomposition pressure on the environment after being discarded.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a highly heat-resistant degradable modified polystyrene foam packaging material and a preparation method thereof. Background technique [0002] Polystyrene (PS) is one of the plastic varieties with the largest output in the world. It is a high polymer synthesized by free radical addition polymerization of styrene monomer. It is usually divided into general-purpose polystyrene and high-impact polystyrene. Ethylene, expanded polystyrene and syndiotactic polystyrene, etc. Expanded polystyrene obtains a closed pore structure by adding a foaming agent to polystyrene. It has the advantages of good water and moisture resistance, low permeability, and excellent heat insulation performance. It is often used as a food packaging material. [0003] But at the same time, the following problems of polystyrene foam have caused great restrictions on its application: (1) polystyrene is difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/14C08L87/00C08G81/02C08B31/04C08G77/38
CPCC08J9/141C08G81/024C08B31/04C08G77/045C08J2387/00C08J2203/14C08G2230/00C08G77/80Y02W90/10
Inventor 廖国庆
Owner 安徽裕河新材料有限公司
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