A kind of method for preparing hard PVC with nano-calcium carbonate

A nano-calcium carbonate, hard technology, applied in chemical instruments and methods, dyed high molecular organic compound treatment, dyed low molecular organic compound treatment and other directions, can solve the problems of unhardened PVC hue research, achieve good economic benefits and Social benefits, low moisture absorption, simple and feasible process

Active Publication Date: 2020-12-08
GUANGXI SHANDONGLAI CHEM IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-calcium carbonate prepared by this invention has good processability and dispersibility, and can significantly improve the strength and impact resistance of PVC plastics. This invention does not study the hue of rigid PVC

Method used

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  • A kind of method for preparing hard PVC with nano-calcium carbonate
  • A kind of method for preparing hard PVC with nano-calcium carbonate
  • A kind of method for preparing hard PVC with nano-calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing nano-calcium carbonate for rigid PVC, comprising the steps of:

[0028] (1) Adjust the specific gravity of the refined milk of lime to 1.065, then introduce it into the bubbling carbonation reactor, adjust the temperature of the milk of lime to 25°C, and introduce CO 2 The mixed gas with a concentration of 33% is subjected to carbonation reaction to pH = 7.0 to obtain a nano-calcium carbonate suspension;

[0029] (2) The nano-calcium carbonate suspension is heated to 80 ° C, and the surface compounded by carboxylated polyethylene wax, epoxy sunflower oil and xylitol is added in an amount of 2.5% based on the dry basis of calcium carbonate. Treatment agent, the mass percentages of carboxylated polyethylene wax, epoxy sunflower oil and xylitol in the surfactant are respectively 35%, 60%, and 5%, and after stirring for 40min, the surface modification is completed;

[0030] (3) The nano-calcium carbonate suspension that has completed the surface modi...

Embodiment 2

[0032] A method for preparing nano-calcium carbonate for rigid PVC, comprising the steps of:

[0033] (1) Adjust the specific gravity of the refined milk of lime to 1.070, then introduce it into the bubbling carbonation reactor, adjust the temperature of the milk of lime to 28°C, and introduce CO 2 The mixed gas with a concentration of 33% is subjected to carbonation reaction to pH = 7.0 to obtain a nano-calcium carbonate suspension;

[0034] (2) The nano-calcium carbonate suspension is heated to 75 ° C, and the surface compounded by carboxylated polyethylene wax, epoxy sunflower oil and xylitol is added in an amount of 3.0% based on the dry basis of calcium carbonate. Treatment agent, the mass percentages of carboxylated polyethylene wax, epoxy sunflower oil and xylitol in the surfactant are respectively 40%, 55%, and 5%, and after stirring for 40min, the surface modification is completed;

[0035] (3) The nano-calcium carbonate suspension that has completed the surface modi...

Embodiment 3

[0037] A method for preparing nano-calcium carbonate for rigid PVC, comprising the steps of:

[0038] (3) Adjust the specific gravity of the refined milk of lime to 1.060, then introduce it into the bubbling carbonation reactor, adjust the temperature of the milk of lime to 30°C, and introduce CO 2 The mixed gas with a concentration of 33% is subjected to carbonation reaction to pH = 7.0 to obtain a nano-calcium carbonate suspension;

[0039] (4) The nano-calcium carbonate suspension is heated to 85 ° C, and the surface compounded by carboxylated polyethylene wax, epoxy sunflower oil and xylitol is added in an amount of 2.0% based on the dry basis of calcium carbonate. Treatment agent, the mass percentages of carboxylated polyethylene wax, epoxy sunflower oil and xylitol in the surfactant are respectively 35%, 60%, and 5%, and after stirring for 45min, the surface modification is completed;

[0040] (3) The nano-calcium carbonate suspension that has completed the surface modi...

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Abstract

The invention discloses a method for preparing nano calcium carbonate for hard polyvinyl chloride (PVC). The method comprises the following steps: regulating the specific gravity of refined lime milkto 1.060-1.070, then introducing the refined lime milk into a bubbling carbonation reaction kettle, regulating the temperature of the lime milk to 25-30 DEG C, and introducing a carbon dioxide-containing mixed gas to carry out a carbonation reaction until the pH value is equal to 7.0; heating the nano calcium carbonate suspension to 75-90 DEG C, adding a surface treating agent formed by compounding carboxylated polyethylene wax, epoxy sunflower seed oil and xylitol, and carrying out stirring for 30-60 minutes to finish surface modification; and carrying out dehydration on the surface-modifiednano calcium carbonate suspension by filter pressing, and carrying out drying and crushing to obtain the nano calcium carbonate for hard PVC. The nano calcium carbonate product prepared by the methodprovided by the invention has low moisture absorption and has excellent processability, mechanical properties, yellowing resistance and other properties, and after hard PVC is filled by the nano calcium carbonate, toughening requirements of the hard PVC are met, and the hue problems of yellowing, reddening and the like of the hard PVC can be improved.

Description

technical field [0001] The invention relates to the technical field of nanometer material modification, in particular to a method for preparing nanometer calcium carbonate for rigid PVC. Background technique [0002] Rigid PVC composite materials are generally composed of PVC resin, fillers and additives, and are widely used in chemical, building materials and other fields. However, during the processing of PVC composite materials, PVC resin is easily decomposed by heat, which leads to problems such as redness and yellowing of PVC products. [0003] Due to its good reinforcing performance, large filling capacity and low price, nano-calcium carbonate has incomparable advantages in rigid PVC filling. However, during the processing and plasticizing process of PVC, due to the small particle size of nano-calcium carbonate and the large friction coefficient, it is easy to cause thermal decomposition of PVC due to high processing temperature due to friction, resulting in hue probl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/10C09C3/08C08L27/06C08L33/04C08K9/04C08K3/26
CPCC08K3/26C08K9/04C08K2003/265C08K2201/011C08L27/06C09C1/021C09C3/006C09C3/08C09C3/10C08L33/04
Inventor 蓝擎朱勇刘卢科廖俊杰冯吉李瑞聪
Owner GUANGXI SHANDONGLAI CHEM IND TECH CO LTD
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