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Modified nano calcium carbonate as well as preparation and application thereof

A nano-calcium carbonate and modification technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of poor compatibility between modifiers and polylactic acid matrix, and achieve increased mechanical properties and crystallization properties , Improve mechanical properties, promote the effect of natural self-degradation characteristics

Active Publication Date: 2020-09-01
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by this invention is to provide a kind of modified nano-calcium carbonate and its preparation and application. Nano calcium carbonate for surface modification

Method used

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  • Modified nano calcium carbonate as well as preparation and application thereof
  • Modified nano calcium carbonate as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take L-lactic acid and put it in the reaction container, and exhaust the air in the container by pumping vacuum to keep the vacuum degree at 0.1MPa. Heat the oil bath to 100°C for pre-dehydration for 1h, keep the reaction environment unchanged, raise the temperature to 135°C, and react for 2h . Use an oil pump to continue the vacuum reaction for 2 hours to obtain L-lactic acid oligomers with a number-average molecular weight of 300-400, and no catalyst is added in this process.

[0039] Take 2g of L-lactic acid oligomers, 8g of nano-calcium carbonate with a particle size of 50-90nm, disperse in dioxane and stir for 1 hour, then put the fully dispersed mixed solution under the conditions of 80°C and vacuum degree of 0.1MP Evaporate the solvent completely, raise the temperature gradient of the oil bath to 140°C, stir and react for 20 minutes, then cool to room temperature to obtain the pre-product, wash the pre-product 4 times with dichloromethane solution, dry it at 40°C...

Embodiment 2

[0042] Take L-lactic acid and put it in the reaction container, and exhaust the air in the container by pumping vacuum to keep the vacuum degree at 0.1MPa. Heat the oil bath to 100°C for pre-dehydration for 1h, keep the reaction environment unchanged, raise the temperature to 135°C, and react for 2h . Use an oil pump to continue the vacuum reaction for 2 hours to obtain L-lactic acid oligomers with a number-average molecular weight of 300-400, and no catalyst is added in this process.

[0043]Take 2g of L-lactic acid oligomers, 8g of nano-calcium carbonate with a particle size of 50-90nm, disperse in dioxane and stir for 1 hour, and then put the fully dispersed mixed solution under the conditions of 80°C and vacuum degree of 0.1MP Evaporate the solvent completely, raise the temperature gradient of the oil bath to 140°C, stir and react for 20 minutes, then cool to room temperature to obtain the pre-product, wash the pre-product with dichloromethane solution 4 times, dry it at 4...

Embodiment 3

[0046] Take L-lactic acid and put it in the reaction container, exhaust the air in the container by vacuuming with a water pump, keep the vacuum degree 0.1MPa, heat the oil bath to 100°C for pre-dehydration for 1h, keep the reaction environment unchanged, raise the temperature to 135°C, and react 2h. Use an oil pump to continue the vacuum reaction for 2 hours to obtain an L-lactic acid oligomer with a number average molecular weight of 300-400, without adding a catalyst in this process.

[0047] Take 2g of L-lactic acid oligomers, 8g of nano-calcium carbonate with a particle size of 50-90nm, disperse in dioxane and stir for 1 hour, and then put the fully dispersed mixed solution under the conditions of 80°C and vacuum degree of 0.1MP Evaporate the solvent completely, raise the temperature gradient of the oil bath to 140°C, stir and react for 20 minutes, then cool to room temperature to obtain the pre-product, wash the pre-product with dichloromethane solution 4 times, dry it a...

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Abstract

The invention relates to modified nano calcium carbonate as well as preparation and application thereof. The modified nano calcium carbonate is obtained from a raw material containing L-lactic acid oligomer and nano calcium carbonate by grafting the L-lactic acid oligomer with the nano calcium carbonate. The nano calcium carbonate has good dispersity and stability in polylactic acid, the additionamount of the nano calcium carbonate is increased, the cost of a polylactic acid material is reduced, the mechanical property of the material is remarkably improved, and the natural self-degradation characteristic of the material is promoted.

Description

technical field [0001] The invention belongs to the field of modified nano-materials and their preparation and application, in particular to a modified nano-calcium carbonate and its preparation and application. Background technique [0002] Polylactic acid is an ideal renewable and environmentally friendly plastic. It uses corn, potatoes and other plants as raw materials. Its production and processing are green and pollution-free. It has good biocompatibility and degradability. Alternatives to traditional petroleum-based plastics in industries such as automotive. However, due to the high cost of polylactic acid materials and defects in mechanical properties, its wider application is greatly limited. It forces humans to conduct modification research on polylactic acid, reduce the cost of polylactic acid, improve the comprehensive performance of materials and expand the application scale. [0003] Using inorganic fillers to fill modified polylactic acid is the most direct a...

Claims

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Application Information

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IPC IPC(8): C01F11/18C08K3/26C08K9/04B82Y30/00B82Y40/00
CPCC01F11/185C08K9/04C08K3/26B82Y30/00B82Y40/00C01P2004/64C08K2201/011C08K2003/265C08L67/04
Inventor 陈支泽王晓茹柴洪彬张文亚牟迪迪张颖
Owner DONGHUA UNIV
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