Method for preparing toughened calcium carbonate filling polylactic acid

A calcium carbonate and polylactic acid technology, which is applied in the field of preparing calcium carbonate-filled polylactic acid and preparing toughened calcium carbonate-filled polylactic acid, can solve the problems of difficult industrialization, complicated process, and high cost, and achieve short production cycle and simple process , The effect of reducing the cost of raw materials

Inactive Publication Date: 2010-02-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is complicated, the process is long, and the cost is high, so it is difficult to industrialize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Mix 5 parts of thermoplastic polycaprolactone with a molecular weight of 80000 and 50 parts of heavy calcium carbonate with a particle size of 2000 mesh in a high-speed mixer at a speed of 5000 rpm / min for 10 minutes; vacuum-dry the PLA at a temperature of 30 ° C for 24 hours 100 parts of resin particles and the treated calcium carbonate are melt-mixed for 10 minutes in an internal mixer with a temperature of 170° C. and a rotation speed of 60 rpm / min.

[0030] Put the kneaded dough into the mold cavity that has been preheated to a constant temperature of 50°C, close the mold, press at a molding temperature of 175°C and a pressure of 15Mpa for 5 minutes, and keep the pressure at 10Mpa, then cool for 3 minutes. A 100 mm x 100 mm x 1 mm molded sheet was prepared. The measured tensile strength of the composite material is 35Mpa, and the elongation at break is 180%.

Embodiment 2

[0032] Mix 3 parts of polycaprolactone polyol with a molecular weight of 400 and 30 parts of light calcium carbonate with a particle size of 4000 mesh in a high-speed mixer at a speed of 4000 rpm / min for 8 minutes; Add 100 parts of PLA resin particles and processed calcium carbonate into a twin-screw extruder for blending, extrude and pelletize, the temperature of each section of the twin-screw extruder is 140°C, 150°C, 160°C, 175°C 45rpm.

[0033] The dried above granules were treated with Y 5 L 30 The SM type five-roller calender is used for forming. The temperature of the main roll of the calender is 190°C, the speed is 30rpm, the temperature of the auxiliary cooling roll is 40°C, and the speed is 8rpm. Finally, the thickness of 0.05mm is obtained through the SY-F42800 plastic cooling and curling machine. Film material with a width of 650mm. The measured tensile strength of the composite material is 45Mpa, and the elongation at break is 230%.

Embodiment 3

[0035] Be that molecular weight is 120000 ethylene-vinyl acetate copolymers (the mass percentage composition of vinyl acetate is 6%) 4 parts and particle diameter are 7000 mesh nano-calcium carbonates 40 parts in the high-speed mixer that speed is 8000rpm / min and mix 10 Minutes; melt and mix 100 parts of PLA resin particles vacuum-dried at 40°C for 40h with the treated calcium carbonate for 3 minutes in a double-roller rubber mixer at a temperature of 150°C and a speed of 50rpm / min, and pelletize.

[0036] Put the dried pellets into a twin-screw extruder for extrusion molding. The temperature of each section of the twin-screw is 130°C, 150°C, 170°C, and 190°C. The screw speed is 40rpm. After vacuum cooling and shaping, the vacuum degree is 40kPa. The water temperature is 20° C., and finally the pipe (outer diameter 32 mm, inner diameter 30 mm) is obtained by a traction device, and the traction speed is 41 rpm. The tensile strength of the obtained composite material was 40 MPa,...

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Abstract

The invention discloses a method for preparing toughened calcium carbonate filling polylactic acid, which comprises steps of: firstly, mixing 1-10 parts of ester polymer coating treated agent and 5-50parts of calcium carbonate for 5-15 minutes in a high speed mixer with the speed more than 4000rpm / min to cause the treating agent to form thin layer distribution on the surface of the calcium carbonate; melting and mixing 100 parts of dried polylactic resin particles and treated calcium carbonate in an internal mixer of 110-175 DEG C ora two roll rubber mixing mill for 3-15 minutes, or adding dried polylactic resin particles and treated calcium carbonate into a double-screw extruder, melting and mixing in the temperature of 110-190 DEG C, and finally extruding pelleting to obtain toughened calcium carbonate filling polylactic acid. The method has simple technique, convenient treatment, short production period and low energy consumption; the prepared calcium carbonate gas good disperse effect in the polymer, has low cost and easily realizes the industrialization production of the coated calcium carbonate.

Description

technical field [0001] The invention belongs to the technical field of preparation of toughened and fully biodegradable polylactic acid composite materials, in particular to a method for preparing calcium carbonate-filled polylactic acid, in particular to the preparation of toughened calcium carbonate-filled polylactic acid by using ester polymer as a coating treatment agent. Lactic method. Background technique [0002] Polylactic acid (PLA) is a polyester polymer, which is first fermented from native starch to obtain lactic acid, and then further synthesized from lactic acid to obtain a high polymer. Since PLA can eventually be decomposed into CO in the environment 2 and H 2 O, will not cause pollution and damage to the environment, so compared with the existing petroleum-based polymers, it is considered to be an environmentally friendly and completely degradable polymer material. Not only that, polylactic acid also has good optics, biocompatibility, physical mechanics a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/04
Inventor 吴智华邓晶晶陶剑黄宇
Owner SICHUAN UNIV
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