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Starch full-biodegradable resin and continuous preparation method thereof

A technology of biodegradable resin and degradable resin, applied in the direction of fermentation, etc., can solve the problems of product mechanical properties and secondary processing performance decline, long dehydration cycle, high energy consumption, etc., to avoid mechanical properties and secondary processing performance decline, mechanical Excellent performance and secondary processing performance, excellent mechanical properties

Active Publication Date: 2013-08-14
安徽华哲虹彩科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the preparation methods of fully biodegradable resins are not yet mature enough.
Taking starch full biodegradable resin as an example, said starch full biodegradable resin generally refers to resins containing starch or derivatives in the composition, and natural starch or derivatives are used as the blending system. The source of natural starch is abundant, the cost is relatively low, and it can be Natural degradation and no pollution, etc., but due to the ordered structure formed by the inherent hydrogen bonds between starch molecules, starch must be modified before processing. At present, the traditional high-speed stirring method has the defects of long dehydration cycle, low efficiency, and high energy consumption. Most of the modification methods are coupling and plasticizing. The plasticizing method reduces the mechanical properties and secondary processing properties of the product due to the migration of the plasticizer and the spontaneous structural orderly reconstruction between the chains, while the coupling The filling content of the modified starch is low, and it is difficult to meet the food contact hygiene index when it is used to make food packaging or tableware

Method used

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  • Starch full-biodegradable resin and continuous preparation method thereof
  • Starch full-biodegradable resin and continuous preparation method thereof
  • Starch full-biodegradable resin and continuous preparation method thereof

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preparation example Construction

[0043] see figure 1, the present invention also provides a continuous preparation method of starch full biodegradable resin, comprising the steps of:

[0044] Step 1, adjust starch and water into starch milk according to the ratio of 1:3, heat to 55-75°C, stir to completely gelatinize the starch, and obtain uniform starch milk.

[0045] The starch can be one of corn starch, tapioca starch, potato starch, and mung bean starch. Different types of starch need to be heated to different temperatures, which can be selected according to actual conditions.

[0046] Step 2, adding a composite catalyst into the starch emulsion, and after fully reacting, carry out centrifugal dehydration separation, drying, and crushing to obtain high amylose with an amylose content of 50-70%, wherein the high amylose water content is 12-15% % parts by weight.

[0047] The composite catalyst is one or a combination of α-amylase, β-amylase, pullulanase, and isoamylase, and its addition ratio is 0.15-0.5...

Embodiment 1

[0075]Example 1: Take 20kg of tapioca starch and put it into the reaction kettle. After stirring, slowly put in a certain amount of deionized water and adjust it into starch milk, heat it to 65°C, stir to make the starch completely gelatinized, and then add 0.10kg of α-starch Enzyme, sterilized after reacting for a certain period of time, separated by centrifugation and dehydration, air-dried to obtain 50% high straight-chain cassava starch, mixed with 0.02kg dibutyltin dilaurate, 0.02kg lauroyl peroxide, and 1kg methyl methacrylate monomer Put it into the feeder, melt and graft in the twin-screw extruder to obtain the ST-g-MMA graft copolymer, after the reaction, the moisture, ungrafted monomer and The small molecules are extracted, the vacuum degree is 0.1MPa, and then 34.5kg of PBAT is fed through the side feeding device, and the extrusion air-cooled strands are cut into pellets to obtain about 52kg of starch biodegradable resin. Put this material into the blown film machin...

Embodiment 2

[0076] Example 2: Take 40kg of cornstarch and put it into the reactor, after stirring, slowly pour in a certain amount of deionized water and adjust it into starch milk, heat it to 70°C, stir to make the starch completely gelatinized, and then add 0.16kg of Purus Lanzyme, sterilized after reacting for a certain period of time, separated by centrifugal dehydration, and air-dried to obtain 55% high-amylose corn starch, together with 0.032kg dibutyltin dilaurate and 0.056kgH 2 o 2 / FeSO 4 , 2kg of lactide monomer is mixed evenly and put into the feeder, melted and grafted in the twin-screw extruder to obtain the ST-g-PLA graft copolymer, after the reaction, it is passed through the alternating condensation high vacuum anti-refilling method The device controls the vacuum degree of about 0.15MPa to extract water, ungrafted monomers and small molecules, and then puts 5.4kgPBS and 37.6kgPLA into the side feeding device, and carries out extrusion air-cooled strand cutting to obtain a...

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Abstract

The invention provides a starch full-biodegradable resin and a continuous preparation method thereof. The starch full-biodegradable resin comprises the following components in parts by weight: 100 parts of high amylose, 0.05-0.10 part of catalyst, 0.1-0.15 part of initiator, 3-5 parts of organic monomer and 65-170 parts of biodegradable resin. The starch full-biodegradable resin is high in starch filling content and excellent in mechanical property and secondary processability, and can meet a stricter sanitary standard. According to the continuous preparation method of the starch full-biodegradable resin, the starch grafting and blending is carried out through continuous operation, the phenomena that the mechanical property and secondary processability of the products are lowered caused by migration of plasticizers and ordered reconfiguration of structures carried out spontaneously among chains are avoided, and a stricter sanitary standard can be met. The prepared starch full-biodegradable resin is high in starch content and excellent in mechanical property, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of biodegradable materials, in particular to a starch full biodegradable resin and a continuous preparation method thereof. Background technique [0002] Completely biodegradable resins are mainly made from natural polymers (such as starch, cellulose, chitin) or agricultural by-products through microbial fermentation or synthesis of biodegradable polymers, such as thermoplastic starch resins, aliphatic polyesters, polylactic acid , Starch / polyvinyl alcohol, etc. all belong to this type of resin. Due to its excellent performance, it can be completely decomposed by environmental microorganisms after being discarded, and finally becomes an integral part of the carbon cycle in nature by being inorganicized. Therefore, with the development of society, products made of completely biodegradable resins will inevitably replace us. Currently used petroleum-based resin products that are difficult to degrade. [0003] However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C12P19/22C12P19/04C08G63/08C12P19/16C08L51/02C08F251/00C08L67/02C12P19/14
Inventor 李积迁陈永弟李建平杨宏
Owner 安徽华哲虹彩科技有限公司
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