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A kind of polylactic acid resin and its preparation method and application

A technology of polylactic acid resin and emulsion, which is applied in the field of rubber resin, can solve the problems of reduced viscosity-average molecular weight, high strength loss, and high cost, and achieve the goals of improving impact resistance and bending resistance, enhancing phase interface interaction, and enhancing adhesion Effect

Active Publication Date: 2022-08-05
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity-average molecular weight of the composite material is reduced, its bending strength is increased from 50MPa to 300MPa, and the interfacial bonding force is also greatly improved, but the cost is high and it cannot be commercialized in the short term.
Zhu et al. (Zhu A P, Diao H X, Rong Q P, etal. Preparation and properties of PLA-Silica nanocomposites [J]. Journal of Applied Polymer Science, 2010, 116 (5); 2866-2873) used oleic acid (OA) to treat nano-SiO 2 Surface treatment to improve PLA and SiO 2 Dispersion and compatibility between PLA / SiO were prepared by melt blending method using Haake torque rheometer 2 Composite materials, but more strength loss
There are still a lot of studies on the modification of natural polymers such as starch and cellulose, but the effect is not satisfactory.

Method used

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  • A kind of polylactic acid resin and its preparation method and application
  • A kind of polylactic acid resin and its preparation method and application
  • A kind of polylactic acid resin and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of polylactic acid (abbreviated as PLA) resin, its preparation steps are as follows:

[0028] 1) 150g GMA (glycidyl methacrylate), 55g water, 20g potassium stearate, 10g tert-dodecanethiol are added to the container and stirred to obtain GMA pre-emulsion;

[0029] 2) 750g of polybutadiene emulsion (polybutadiene emulsion refers to a butadiene self-polymerization emulsion with a solid content of 40wt%, a particle size of 300nm, and a pH of 11.0) was added to the reaction vessel, stirred and heated to 65°C;

[0030] 3) Slowly drop the pre-emulsion into the reactor, simultaneously drop 10 g of a 10 wt% potassium persulfate aqueous solution and 10 g of a 10 wt % sodium thiosulfate aqueous solution, and control the flow rate. The aqueous solution of sodium sulfate is added dropwise 0.5h after the pre-emulsification is completed to obtain a graft emulsion;

[0031] 4) 100g CaCl 2 Add 900g of water to dissolve to obtain a coagulation solution;

[0032] 5) Heat the co...

Embodiment 2

[0036] A kind of polylactic acid resin, its preparation step is as follows:

[0037] 1) 50g GMA, 145g water, 1g potassium stearate, 1g tert-dodecanethiol are added to the container and stirred to obtain GMA pre-emulsion;

[0038] 2) 800g of polybutadiene emulsion (polybutadiene emulsion refers to a butadiene self-polymerization emulsion with a solid content of 20wt%, a particle size of 100nm, and a pH of 13.0) was added to the reaction vessel, stirred and heated to 80°C;

[0039] 3) Slowly drop the pre-emulsion into the reactor, simultaneously drop 1 g of a 10wt% potassium persulfate aqueous solution and 1 g of a 10wt% sodium thiosulfate aqueous solution, control the flow rate, the pre-emulsion is added dropwise for 2h, the potassium persulfate aqueous solution, sulfuric acid The aqueous solution of sodium sulfate is added dropwise 0.5h after the pre-emulsification is completed to obtain a graft emulsion;

[0040] 4) Put 100g MgSO 4 Add 900g of water to dissolve to obtain a ...

Embodiment 3

[0045] A kind of polylactic acid resin, its preparation step is as follows:

[0046] 1) 200g GMA, 200g water, 50g potassium oleate, 10g tert-dodecanethiol are added to the container and stirred to obtain GMA pre-emulsion;

[0047] 2) 500g of polybutadiene emulsion (polybutadiene emulsion refers to a butadiene self-polymerization emulsion with a solid content of 60wt%, a particle size of 600nm, and a pH of 7.0) is added to the reaction vessel, stirred and heated to 50°C;

[0048] 3) Slowly drop the pre-emulsion into the reactor, drop 20g of 10wt% potassium persulfate aqueous solution and 20g of 10wt% sodium thiosulfate aqueous solution simultaneously, control the flow rate, the pre-emulsion is added dropwise for 8h, the potassium persulfate aqueous solution, sulfur The aqueous solution of sodium sulfate is added dropwise 0.5h after the pre-emulsification is completed to obtain a graft emulsion;

[0049] 4) Put 100g H 2 SO 4 Add 900g of water to dissolve to obtain a coagulati...

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Abstract

The invention provides a polylactic acid resin and a preparation method thereof. The method comprises the following steps: 1) preparing GMA pre-emulsion; 2) adding 50-80 parts by weight of polybutadiene emulsion to a reaction vessel, stirring and heating up 3) drop the GMA pre-emulsion into the polybutadiene emulsion, simultaneously drop into the aqueous solution of the initiator and the aqueous solution of the activator to obtain a graft emulsion; 4) prepare a coagulation solution, and mix the described The coagulation solution is heated, and the graft emulsion is dropped into the coagulation solution; 5) the mixture in step 4) is heated to 80-95° C., kept at a temperature of 0.5-2 h, and the residual solid is dried after filtration to obtain GMA-grafted polybutylene Diene rubber powder; 6) blending and extruding the GMA-grafted polybutadiene rubber powder and PLA to obtain a polylactic acid resin. The polylactic acid resin prepared according to the method can effectively prevent the extension of silver streaks, has good impact resistance and bending properties, and can also enhance the adhesion of the electroplating layer.

Description

technical field [0001] The invention belongs to the field of rubber resins, and relates to a polylactic acid resin. Background technique [0002] At present, relatively more biodegradable plastics are used in aliphatic polyesters such as polylactic acid (PLA), polybutylene adipate / terephthalate (PBAT) and polybutylene succinate (PBS). Because the performance cannot reach the level of non-degradable plastics, the application is greatly limited. Therefore, how to improve the mechanical properties of biodegradable plastics has become the research direction of new materials. Weng et al. (WengYX, JinY J, Meng Q Y, et al. [J]. Polymer Testing, 2013, 32(5): 918-926) treated the surface of carbon fibers with nitric acid, and prepared PLA / carbon fibers by solution casting and compression molding composite material. The viscosity-average molecular weight of the composite material is reduced, the flexural strength is increased from 50MPa to 300MPa, and the interfacial bonding force ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L51/04C08F279/02C08F220/32C25D5/56
CPCC08L67/04C08F279/02C25D5/56C08L51/04
Inventor 麻宁韩强孙双翼乔义涛黎源
Owner WANHUA CHEM GRP CO LTD
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