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Method for toughening polydactyl acid through crosslinking sliding graft polymer

A technology of sliding grafting and toughening modification, which is applied in the field of blending modification of polylactic acid, can solve the problems of unreachable and high energy consumption, and achieve the effects of improving compatibility, improving flexibility and increasing adhesion

Active Publication Date: 2013-12-11
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of copolymerization consumes a lot of energy and cannot reach the level of actual industrial production at present. Therefore, blending modification has become the main means of toughening modification.

Method used

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  • Method for toughening polydactyl acid through crosslinking sliding graft polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0016] The polylactic acid and the sliding graft polymer were dried for 48 hours in a vacuum oven at 60°C; 98 parts of PLA and 2 parts of the sliding graft polymer were placed in a Hacker internal mixer at a speed of 70 rpm, densely The refining temperature is 190° C., blending for 5 minutes, and continuing banburying for 10 minutes to obtain polylactic acid / sliding graft polymer material.

[0017] The tensile strength of the material is 55Mpa, the elongation at break is 18%, and the Izod notched impact strength is 4KJ / m 2 .

Embodiment 3

[0019] The polylactic acid and the sliding graft polymer were dried for 48h in a 60°C vacuum drying oven; 80 parts of PLA and 20 parts of the sliding graft polymer were mixed in a Haake internal mixer at a speed of 70 rpm, densely The refining temperature is 190° C., blending for 5 minutes, and continuing banburying for 10 minutes to obtain polylactic acid / sliding graft polymer material.

[0020] The tensile strength of the material is 50Mpa, the elongation at break is 19%, and the Izod notched impact strength is 6KJ / m 2 .

Embodiment 4

[0022] The polylactic acid and the sliding graft polymer were dried for 48h in a vacuum oven at 60°C; 70 parts of PLA and 30 parts of the sliding graft polymer were mixed in a Haake internal mixer at a speed of 70 rpm, densely The refining temperature is 190° C., blending for 5 minutes, and continuing banburying for 10 minutes to obtain polylactic acid / sliding graft polymer material.

[0023] The tensile strength of the material is 45Mpa, the elongation at break is 23%, and the Izod notched impact strength is 7KJ / m 2 .

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Abstract

The invention provides a method for toughening polydactyl acid through crosslinking a sliding graft polymer. A sliding graft polymer having a super-molecular structure is adopted as a toughener, a compound with an isocyanate group is adopted as a crosslinking agent, and the sliding graft polymer and the crosslinking agent undergo an in-situ crosslinking reaction under melt blending in a polylactic acid (PLA) matrix. Generated nanometer rubber particles having a sliding crosslinking structure are uniformly dispersed in the PLA matrix, so a nano-granular dispersion phase can increase the compatibility of the PLA and the sliding graft polymer and obviously toughens the PLA. The invention discloses a melt blending method of the sliding graft polymer, the PLA and the crosslinking agent, an optimal experiment condition and an optimal blending ratio. The method has the advantages of high toughening efficiency, less addition, small influences on the strength, rapid crosslinking reaction, short production period, simple process flow, low cost, environmental protection, and easy realization of the industrialized popularization application.

Description

technical field [0001] The invention relates to the blending modification of polylactic acid, which adopts cross-linked sliding graft polymer nanoparticles to carry out toughening modification on polylactic acid, and belongs to the technical field of polymer reactive blending modification. Background technique [0002] In the 1930s, plastic materials were put into use. Due to the characteristics of light weight, low price, corrosion resistance and simple production process, plastic materials have spread to all fields of people's production and life. Global plastic production is growing at an alarming rate. According to the forecast of relevant departments, the world's plastic demand will reach 380 million tons by 2026, so the plastic industry has become the largest material industry. While the plastics industry is developing at a high speed, it is facing serious resource problems. Because the vast majority of plastic raw materials come from petroleum. It is well known tha...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L51/02C08L71/08C08K5/29
Inventor 张立群李雪康海澜杨丹蔡小平刘学成赵长明
Owner BEIJING UNIV OF CHEM TECH
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