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A kind of preparation method of nano calcium carbonate used for viscosity enhancement of pvc welding seam sealant

A nano-calcium carbonate and sealing adhesive technology, applied in the field of materials, can solve the problems of difficult to meet the mechanical properties of rubber products, easy to flow, increase the cost of rubber products, etc.

Active Publication Date: 2020-07-31
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the automobile weld sealants are PVC plastisol products, the main components are base materials, fillers, plasticizers, adhesives and other auxiliary materials; for PVC weld sealants, on the one hand, the hardness and adhesion of the coating are required. strength, elongation, shear strength, and tensile strength are better, and on the other hand, it is required to have good viscosity; calcium carbonate powder is widely used as a filler in PVC weld sealants, but ordinary calcium carbonate The PVC weld sealant made of ordinary nano-calcium carbonate as filler often has low viscosity, easy to flow, and poor construction performance; to solve the problem of low viscosity of PVC weld sealant filled with calcium carbonate powder, two methods can be used. One is to add a special thickener, this method is effective, but it will increase the cost of the rubber product; the other is to increase the amount of calcium carbonate filler, this method can increase the viscosity to a certain extent, but the glue The mechanical properties of the product are difficult to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Limestone is calcined into calcium oxide at 950°C, and then crushed to a particle size of ≤20mm to make calcium oxide fine grain; add hot water at 100°C to the calcium oxide fine grain for digestion to make digested slurry ; Wherein the hot water addition is 5 times of the calcium oxide fine powder quality;

[0024] Pass the digested slurry while hot through a 400-mesh sieve to remove coarse particles and impurities, and make calcium hydroxide emulsion;

[0025] Microbubble ultra-fine calcium carbonate synthesis reactor is used as the synthesis reaction equipment; the calcium hydroxide emulsion is diluted with water to a mass concentration of 6% to make a diluted emulsion; when the temperature of the diluted emulsion is lowered to 25°C, it is placed in the synthesis reaction equipment , adding a seed growth agent to the diluted emulsion; the seed growth agent is selected from sodium citrate or aluminum chloride, and the amount of the seed growth agent is 0.5% of the qua...

Embodiment 2

[0032] Method is with embodiment 1, and difference is:

[0033] (1) limestone calcination temperature 800°C; add hot water at a temperature of 95°C to the calcium oxide fine granules for digestion, and the amount of hot water added is 3 times the quality of the calcium oxide fine powder;

[0034] (2) Calcium hydroxide emulsion is diluted with water to a mass concentration of 8%; when the temperature of the diluted emulsion is reduced to 26°C, it is placed in the synthesis reaction equipment; the seed crystal growth agent is sodium citrate or aluminum chloride, and the consumption is calcium oxide fine powder 0.8% of the mass of the material;

[0035] (3) the add-on of class sheet type growth agent accounts for 0.8% of calcium oxide fine powder material gross mass by class sheet type growth agent; Class sheet type growth agent is sodium tripolyphosphate; When the pH value of diluted emulsion is at 10.8, Stop feeding the mixed gas, add a consistency enhancer to the diluted emul...

Embodiment 3

[0041] Method is with embodiment 1, and difference is:

[0042] (1) Limestone calcination temperature 1000 DEG C; Add hot water at a temperature of 98 DEG C to the calcium oxide fine granular material for digestion, the amount of hot water added is 6 times the quality of the calcium oxide fine powder material;

[0043] (2) Calcium hydroxide emulsion is diluted with water to a mass concentration of 9%; when the temperature of the diluted emulsion is reduced to 28°C, it is placed in the synthesis reaction equipment; the seed crystal growth agent is sodium citrate or aluminum chloride, and the consumption is calcium oxide fine powder 0.3% of the mass of the material;

[0044] (3) the add-on of class sheet type growth agent accounts for 1% of calcium oxide fine powder material gross mass by class sheet type growth agent; Class sheet type growth agent is sodium hexametaphosphate; When the pH value of diluted emulsion is at 11, Stop feeding the mixed gas, add a consistency enhancer...

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Abstract

A preparation method for nano calcium carbonate used for enhancing the viscosity of a PVC welding seam sealing adhesive, the method being carried out according to the following steps: (1) calcining limestone, then crushing, adding hot water and digesting; (2) sieving while hot; (3) adding water for dilution, and when the temperature drops to ≤28°C, loading into a synthesis reaction device and adding a seed crystal growth agent; (4) introducing a mixed gas for synthesis; when conductivity drops to the lowest point for the first time and then rises again, adding a tablet-type growth agent, and when pH is 10.5-11, stopping ventilation, adding a consistency enhancer and applying ultrasonic waves, and ventilating again until pH=7; (5) adding an activator for modification treatment after heating; (6) filtering and drying to remove water, and crushing an agglomerated portion. A product prepared by the present invention is added to a PVC welding seam sealing adhesive, which may have the effect of a thickener, and also achieve a filling effect for calcium carbonate.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of nano-calcium carbonate for enhancing the viscosity of a PVC weld seam sealing adhesive. Background technique [0002] At present, most of the automobile weld sealants are PVC plastisol products, and the main components are base materials, fillers, plasticizers, adhesives and other auxiliary materials; for PVC weld sealants, on the one hand, the hardness and adhesion of the coating are required. Strength, elongation, shear strength, and tensile strength are better, and on the other hand, it is required to have good viscosity; calcium carbonate powder is widely used as a filler in PVC weld sealant, but ordinary calcium carbonate The PVC weld sealant made of ordinary nano-calcium carbonate as filler often has low viscosity, easy to flow, and poor construction performance; to solve the problem of low viscosity of PVC weld sealant filled with calc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/10C09C3/08C09J11/04C09J127/06
CPCC01P2004/64C01P2006/12C09C1/021C09C3/006C09C3/08C09C3/10C09J11/04C09J127/06C08K9/08C08K3/26C08K9/04
Inventor 陈晓龙于福家丛国龙张淘忠
Owner NORTHEASTERN UNIV LIAONING