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Preparation method of starch and low-polylactic acid graft copolymer

A technology of graft copolymer and oligomeric lactic acid is applied in the field of preparation of starch and oligomeric lactic acid graft copolymer, which can solve the problems of poor compatibility and ductility, high product cost and high crystallinity, and achieve compatibility High, low cost, easy to process and form the effect

Inactive Publication Date: 2019-12-20
SHOUGUANG GOLDEN FAR EAST MODIFIED STARCH CO LTD +3
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a preparation method of graft copolymer of starch and oligomeric lactic acid, which aims to solve the problems of easy water absorption and low strength of starch-based materials in the prior art, high crystallinity of polylactic acid materials and low product cost. High problem, and the combination of the two also has many problems of poor compatibility and ductility

Method used

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  • Preparation method of starch and low-polylactic acid graft copolymer
  • Preparation method of starch and low-polylactic acid graft copolymer

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preparation example Construction

[0015] Specifically, the preparation method of the starch and oligomeric lactic acid graft copolymer comprises the following steps:

[0016] 50-100 parts by weight of the starch reaction product, 50-100 parts by weight of the oligomeric lactic acid reaction product and 1-5 parts by weight of the polybasic organic acid are put into a high-speed mixer and mixed for 5-30 minutes to obtain the first mixture;

[0017] Add 0.5-2 parts by weight of graft monomer and 0.1-1 part by weight of initiator to the first mixture, react and mix at 100-200°C for 30-150 minutes to obtain a second mixture;

[0018] Add 0.5-2 parts by weight of bio-lubricant and 0.2-2 parts by weight of bio-enhancer into the second mixture, mix them evenly, and then add them to a parallel co-phase twin-screw extruder for plasticization and granulation at a temperature of 90-200 ℃, that is.

[0019] In the embodiment of the present invention, the starch reaction product is a modified product of starch. The specifi...

Embodiment 1

[0034] A kind of preparation method of starch and oligomeric lactic acid graft copolymer, comprising:

[0035] 100 parts by weight of the starch reaction product, 100 parts by weight of the oligomeric lactic acid reaction product and 5 parts by weight of itaconic acid were put into a high mixer and mixed for 30 minutes to obtain the first mixture;

[0036] Add 2 parts by weight of acrylic acid and 1 part by weight of ammonium cerium nitrate to the first mixture, and react and mix at 200°C for 150 minutes to obtain the second mixture;

[0037] 2 parts by weight of stearic acid and 2 parts by weight of butyl acrylate were added to the second mixture, mixed evenly, and then added to a parallel co-phase twin-screw extruder for plasticization and granulation at a temperature of 200°C to obtain the product.

[0038] Wherein, the preparation method of described starch reaction product is:

[0039] 100 parts by weight of tapioca starch, 50 parts by weight of water and 2 parts by weig...

Embodiment 2

[0044] A kind of preparation method of starch and oligomeric lactic acid graft copolymer, comprising:

[0045]60 parts by weight of the starch reaction product, 60 parts by weight of the oligomeric lactic acid reaction product and 2 parts by weight of tartaric acid were put into a high mixer and mixed for 8 minutes to obtain the first mixture;

[0046] Add 0.8 parts by weight of maleic anhydride and 0.3 parts by weight of potassium permanganate to the first mixture, and react and mix at 120°C for 50 minutes to obtain the second mixture;

[0047] Add 0.8 parts by weight of stearylamide and 0.8 parts by weight of butyl methacrylate to the second mixture, mix them uniformly, and then add them to a parallel co-phase twin-screw extruder for plasticization and granulation at a temperature of 120°C to obtain .

[0048] Wherein, the preparation method of described starch reaction product is:

[0049] 100 parts by weight of potato starch, 20 parts by weight of water and 0.9 parts by ...

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Abstract

The invention belongs to the technical field of materials, and provides a preparation method of a starch and low-polylactic acid graft copolymer. The preparation method of the starch and low-polylactic acid graft copolymer comprises the steps that a starch reaction product, a low-polylactic acid reaction product and poly-organic acid are put into a high mixing machine for uniform blending to obtain a first mixture; a graft monomer and an initiator are added into the first mixture, and reaction mixing is carried out under 100-200 DEG C to obtain a second mixture; and a biological lubricant anda biological reinforcing agent are added into the second mixture, homogeneous mixing is carried out and a mixture is added into a parallel same-phase twin-screw extruder for plasticizing granulation,and the starch and low-polylactic acid graft copolymer is obtained. On the one hand, graft copolymerization is carried out on modified starch and modified low-polylactic acid, compatibility is higher,hydrophilic groups of the modified starch and the modified low-polylactic acid are shielded mutually, a hydrophobic effect is achieved and the grafting efficiency is high, organic combination of thestarch and the low-polylactic acid is realized, and the advantages of the starch and the low-polylactic acid are fully played; and on the other hand, the degradation performance of the obtained starchand low-polylactic acid graft copolymer is excellent, and the cost is obviously lower than traditional polylactic acid.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a graft copolymer of starch and oligomeric lactic acid. Background technique [0002] In the rapidly developing modern society, especially today when the problem of environmental pollution is becoming more and more serious and resources are increasingly depleted, the "white pollution" caused by pollution sources such as foam packaging, lunch boxes, petroleum-based plastic bags, some electronic buffer packaging, and agricultural mulch The problem has been paid more and more attention. [0003] Starch is a widely sourced degradable natural polymer material, but its high water absorption affects its application as a thermoplastic material; while the heat deformation temperature of polylactic acid is generally within 55 ° C, and the holding time in the industrial production process It is also long, which is not conducive to the rapid promotion o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F283/02C08F220/06C08F222/06C08F236/08C08F218/08C08F220/56C08F212/08
CPCC08F251/00C08F283/02C08F220/06C08F222/06C08F218/08C08F220/56C08F236/08C08F212/08
Inventor 孙敬善刘进忠李成金高本勇侯月会王志强吴泽华
Owner SHOUGUANG GOLDEN FAR EAST MODIFIED STARCH CO LTD
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