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-ca

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
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Example Embodiment

[0037] Example 1

[0038] Take L-lactic acid and place it in the reaction vessel, exhaust the air in the vessel by pumping vacuum, keep the vacuum degree 0.1MPa, heat the oil bath to 100℃ for pre-dehydration for 1h, keep the reaction environment unchanged, heat up to 135℃, react for 2h . Switch to 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 to 400, without adding catalyst in this process.

[0039] Take 2g of L-lactic acid oligomer and 8g of nano-calcium carbonate with a particle size of 50-90nm, disperse it in dioxane and stir for 1h, and then put the fully dispersed mixture at 80℃ and a vacuum of 0.1MP. Evaporate the solvent completely, increase the temperature gradient of the oil bath to 140°C, stir and react for 20 minutes and then cool to room temperature to obtain the pre-product. Wash the pre-product with dichloromethane solution 4 times, dry at 40°C for 4 hours and take it out to obt...

Example Embodiment

[0041] Example 2

[0042] Take L-lactic acid and place it in the reaction vessel, exhaust the air in the vessel by pumping vacuum, keep the vacuum degree 0.1MPa, heat the oil bath to 100℃ for pre-dehydration for 1h, keep the reaction environment unchanged, heat up to 135℃, react for 2h . Switch to 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 to 400, without adding catalyst in this process.

[0043] Take 2g of L-lactic acid oligomer and 8g of nano-calcium carbonate with a particle size of 50-90nm, disperse it in dioxane and stir for 1h, and then put the fully dispersed mixture at 80℃ and a vacuum of 0.1MP. Evaporate the solvent completely, increase the temperature gradient of the oil bath to 140°C, stir and react for 20 minutes and then cool to room temperature to obtain the pre-product. Wash the pre-product with dichloromethane solution 4 times, dry at 40°C for 4 hours and take it out to obt...

Example Embodiment

[0045] Example 3

[0046] Take L-lactic acid and place it in the reaction vessel. Use a water pump to evacuate the air in the vessel. Keep the vacuum at 0.1MPa. Heat the oil bath to 100°C for pre-dehydration for 1 hour. Keep the reaction environment unchanged. The temperature is raised to 135°C. 2h. Switch to 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 to 400, without adding catalyst in this process.

[0047] Take 2g of L-lactic acid oligomer and 8g of nano-calcium carbonate with a particle size of 50-90nm, disperse it in dioxane and stir for 1h, and then put the fully dispersed mixture at 80℃ and a vacuum of 0.1MP. Evaporate the solvent completely, raise the temperature gradient of the oil bath to 140°C, stir and react for 20 minutes and then cool to room temperature to obtain the pre-product. Wash the pre-product with dichloromethane solution 4 times, dry at 40°C for 4 hours and take it o...

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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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