Polylactic acid resin as well as preparation method and application thereof

A polylactic acid resin and emulsion technology, 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: 2021-07-13
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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  • Polylactic acid resin as well as preparation method and application thereof
  • Polylactic acid resin as well as preparation method and application thereof
  • Polylactic acid resin as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0029] 2) Add 750g of polybutadiene emulsion (polybutadiene emulsion refers to butadiene self-polyemulsion with solid content of 40wt%, particle size of 300nm, and pH of 11.0) into the reaction vessel, stir and heat up to 65°C;

[0030] 3) Slowly drip the pre-emulsion into the reactor, drop 10g of 10wt% potassium persulfate aqueous solution and 10g of 10wt% sodium thiosulfate aqueous solution at the same time, control the flow rate, and complete the pre-emulsion 4h dropwise, potassium persulfate aqueous solution, sulfur The sodium sulfite aqueous solution was added dropwise 0.5h after the pre-emulsion was dropped to obtain a graft emulsion;

[0031] 4) 100g CaCl 2 Add 900g of water to dis...

Embodiment 2

[0036] A kind of polylactic acid resin, its preparation steps are as follows:

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

[0038] 2) Add 800g of polybutadiene emulsion (polybutadiene emulsion refers to butadiene self-polyemulsion with solid content of 20wt%, particle size of 100nm, and pH of 13.0) into the reaction vessel, stir and heat up to 80°C;

[0039] 3) Slowly drop the pre-emulsion into the reactor, drop 1g of 10wt% potassium persulfate aqueous solution and 1g of 10wt% sodium thiosulfate aqueous solution at the same time, control the flow rate, and complete the pre-emulsion 2h dropwise, the potassium persulfate aqueous solution, sulfur The sodium sulfite aqueous solution was added dropwise 0.5h after the pre-emulsion was dropped to obtain a graft emulsion;

[0040] 4) 100g MgSO 4 Add 900g of water to dissolve to obtain coagulation solution;

[0041] 5) Heat the ...

Embodiment 3

[0045] A kind of polylactic acid resin, its preparation steps are as follows:

[0046] 1) Add 200g GMA, 200g water, 50g potassium oleate, and 10g tert-dodecylmercaptan into the container and stir to obtain GMA pre-emulsion;

[0047] 2) Add 500g of polybutadiene emulsion (polybutadiene emulsion refers to butadiene self-polyemulsion with solid content of 60wt%, particle size of 600nm, and pH of 7.0) into the reaction vessel, stir and heat up to 50°C;

[0048] 3) Slowly drip the pre-emulsion into the reactor, drop 20 g of 10 wt % potassium persulfate aqueous solution and 20 g of 10 wt % sodium thiosulfate aqueous solution at the same time, control the flow rate, and complete the pre-emulsion 8 h dropwise, potassium persulfate aqueous solution, sulfur The sodium sulfite aqueous solution was added dropwise 0.5h after the pre-emulsion was dropped to obtain a graft emulsion;

[0049] 4) 100g H 2 SO 4 Add 900g of water to dissolve to obtain coagulation solution;

[0050] 5) Heat t...

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Abstract

The invention provides polylactic resin and a preparation method thereof. The method comprises the following steps: 1) preparing a GMA pre-emulsion; (2) adding 50-80 parts by weight of polybutadiene emulsion into the reaction container, stirring and heating; 3) dropwise adding the GMA pre-emulsion into the polybutadiene emulsion, and dropwise adding an aqueous solution of an initiator and an aqueous solution of an activator at the same time to obtain a grafted emulsion; 4) preparing a coagulation solution, heating the coagulation solution, and dropwise adding the grafted emulsion into the coagulation solution; (5) heating the mixture obtained in the step (4) to 80-95 DEG C, preserving heat for 0.5-2 hours, filtering, and drying residual solids to obtain GMA grafted polybutadiene rubber powder; and 6) carrying out blending extrusion on the GMA grafted polybutadiene rubber powder and PLA to obtain the polylactic resin. The polylactic acid resin prepared according to the method can effectively prevent the extension of crazing, has better impact resistance and bending property, and can enhance the adhesive force of an electroplated 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 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 modify and improve the mechanical properties of biodegradable plastics has become the direction of new material research. Weng et al. (WengYX, JinY J, Meng Q Y, et al.[J].PolymerTesting, 2013, 32(5):918-926) treated the surface of carbon fiber with nitric acid, and prepared PLA / carbon fiber by solution casting and compression molding. composite material. 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(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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