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A kind of thickening method of pla

A technology of tackifying auxiliary agent and silane coupling agent, which is applied in the field of tackifying PLA, can solve problems such as the decrease of crystallization rate, and achieve the effects of low cost, improved crystallinity and simple preparation method.

Active Publication Date: 2021-08-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional chain extenders usually lead to a decrease in crystallization rate

Method used

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  • A kind of thickening method of pla
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  • A kind of thickening method of pla

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] With 3L industrial alcohol (Anhui Ante Food Co., Ltd.), 300g SiO 2 (Wanjing New Materials Co., Ltd., VK-SP30), 2.84g γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560, 0.12mol) (Aladdin Shanghai Biochemical Co., Ltd.), 6.64 g of n-octyltriethoxysilane (KH-832, 0.24 mol) (Aladdin Shanghai Biochemical Co., Ltd.) (the molar ratio of the two siloxanes is 1:2), mixed evenly under mechanical stirring. Use 10wt% hydrochloric acid to adjust the pH to 4, fully stir the reaction (room temperature, pH ~ 4, 4h) and then centrifuge the resulting nano-slurry (10000rpm, desktop high-speed centrifuge, H / T16MM, Hunan Hexi Instrument Equipment Co., Ltd.) , the centrifuged solid nano-SiO 2 Dry in a blast oven for 12h (80°C) to obtain modified nano-SiO 2 particles.

[0037] The obtained modified nano-SiO 2 The particles were added with 1wt% in PLA (Natureworks, USA, type 4032d), and in a miniature conical twin-screw extruder (WLG10 / WZS10-D, Shanghai Xinshuo Precision Machinery Co., Lt...

Embodiment 2

[0041] Others are the same as in Example 1, but using 4.26g KH-560, 4.98g KH-832 (mol ratio is 1:1) to modify nano-SiO 2Particles were obtained to obtain modified PLA, and the effects of viscosity increasing and crystallization induction were measured. The results are shown in Table 2 below. It shows that the addition of chain extender does have a viscosity-increasing effect, and the crystallinity is slightly improved.

[0042] Table 2

[0043] Low frequency area (~1rad / s) High frequency area (~100rad / s) Crystallinity% Melt viscosity of unmodified PLA (Pa·s) ～180 ～100 13.2 Modified PLA melt viscosity (Pa·s) ～225 ～100 14.2

Embodiment 3

[0045] Others are the same as in Example 1, but adopt 5.68g KH-560, 3.32g KH-832 (mol ratio is 2:1) to modify nano-SiO 2 Particles were obtained to obtain modified PLA, and the effects of viscosity increasing and crystallization induction were measured. The results are shown in Table 3 below. It shows that the addition of chain extender does have a viscosity-increasing effect, and has little effect on crystallinity.

[0046] table 3

[0047] Low frequency area (~1rad / s) High frequency area (~100rad / s) Crystallinity% Melt viscosity of unmodified PLA (Pa·s) ～180 ～100 13.2 Modified PLA melt viscosity (Pa·s) ～230 ～105 13.9

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Abstract

A kind of thickening method of PLA, described method is: add thickening auxiliary agent in PLA, realize the uniform dispersion of nanoparticle in PLA by internal mixer or twin-screw extruder, simultaneously through thickening auxiliary agent The reaction of the functional group contained on the surface and the carboxyl group at the end of the PLA chain realizes the thickening of PLA; the described thickening aid is obtained by modifying the surface of the inorganic non-metallic particles with a silane coupling agent. The surface contains functional groups and Inorganic non-metallic particles of short-chain alkyl groups; the silane coupling agent is composed of at least one silane coupling agent containing functional groups at the end and at least one silane coupling agent containing short-chain alkyl groups at the end, the The functional group is an epoxy group or an amine group that can react with -COOH; the inorganic non-metallic particles are SiO with hydroxyl groups on the surface 2 、TiO 2 , CaCO 3 , ZnO, clay or graphene oxide, the particle size range is 10-200nm. The chain extension method of the invention is simple, efficient and low-cost, and can realize the thickening of PLA in one step.

Description

[0001] (1) Technical field [0002] The invention relates to a method for increasing the viscosity of polylactic acid (PLA). [0003] (2) Background technology [0004] Polylactic acid (PLA) is a biodegradable polymer material prepared by chemical synthesis from renewable biological resources. Its fibers and films are widely used in textile, packaging, agriculture, forestry, medical and health fields It has a very wide range of applications, but because the PLA molecular chain is long and branched, the melt viscosity is very small, resulting in low melt strength, so its molding method is very limited. In order to improve the production efficiency of PLA products, it is necessary to realize multiple In the production method of modernization, its molecular weight must be increased, that is, chain extension and viscosity increase. Currently, the commonly used PLA chain extension tackifiers in the market are oligomers or polymers containing active epoxy groups. chain extension. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K9/10C08K3/36C08K3/22
CPCC08K3/22C08K3/36C08K9/10C08K2003/2241C08K2201/003C08K2201/011C08L67/04
Inventor 冯杰张静徐锡威祝晨曦
Owner ZHEJIANG UNIV OF TECH
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