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Preparation method of nano calcium carbonate for PVC automobile bottom gluing yield enhancement

A technology of nano-calcium carbonate and glue coating, which is applied in the field of materials, can solve problems such as low viscosity and low yield value, and achieve the effect of increasing the yield value

Active Publication Date: 2019-03-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of the adhesive industry and the further improvement of the performance requirements of adhesive products, the deficiencies of these calcium carbonate products have been exposed, and the existing products have been unable to meet the needs of PVC primers; Calcium carbonate with lower, higher yield value, and preparation of adhesive cohesion and film-forming mechanical strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Limestone is calcined into calcium oxide at 950°C, and then crushed to a particle size ≤ 20mm to make calcium oxide fine grains; add hot water at 95°C to the calcium oxide fine grains for digestion to make digested Slurry; wherein the amount of hot water added is 3 times of the quality of calcium oxide fine powder;

[0023] 2. Pass the digested slurry while hot through a 400-mesh sieve to remove coarse particles and impurities, and make calcium hydroxide emulsion;

[0024] 3. Microbubble type 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 30°C, it is placed in the synthesis reaction inside the device;

[0025] 4. Inject mixed gas into the diluted emulsion under stirring conditions for synthesis; during the synthesis, the conductivity and pH value of the d...

Embodiment 2

[0031] Method is with embodiment 1, and difference is:

[0032] (1) calcining limestone into calcium oxide at 900°C; adding hot water at a temperature of 97°C to the fine calcium oxide granular material for digestion; wherein the amount of hot water added is 4 times the quality of the fine calcium oxide powder;

[0033] (2) Dilute the calcium hydroxide emulsion with water to a mass concentration of 7%; when the temperature of the diluted emulsion is reduced to 29° C., place it in the synthesis reaction equipment;

[0034] (3) The add-on of crystal thixotropy modifier accounts for 0.6% of the total mass of calcium oxide fine powder according to crystal thixotropy modifier; Crystal thixotropy modifier is sodium benzenesulfonate; Diluted emulsion standing time 40min; The volume percentage of carbon dioxide in the mixed gas is 40%;

[0035] At the beginning of the synthesis, the conductivity of the diluted emulsion was 7.7ms / cm, and the conductivity was 3.9ms / cm when it fell to t...

Embodiment 3

[0040] Method is with embodiment 1, and difference is:

[0041](1) calcining limestone into calcium oxide at 800°C; adding hot water at a temperature of 99°C to the fine calcium oxide granular material for digestion; wherein the amount of hot water added is 5 times the quality of the fine calcium oxide powder;

[0042] (2) Dilute the calcium hydroxide emulsion with water to a mass concentration of 8%; when the temperature of the diluted emulsion is reduced to 28° C., place it in the synthesis reaction equipment;

[0043] (3) The add-on of crystal thixotropy modifier accounts for 0.8% of the total mass of calcium oxide fine powder according to crystal thixotropy modifier; crystal thixotropy modifier is sodium lignosulfonate; dilute emulsion standing time 45min ; The volume percentage of carbon dioxide in the mixed gas is 60%;

[0044] At the beginning of the synthesis, the conductivity of the diluted emulsion was 7.7ms / cm, and the conductivity was 3.5ms / cm when it fell to the ...

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Abstract

The invention relates to a preparation method of nano calcium carbonate for PVC automobile bottom gluing yield enhancement, which comprises the following steps of: (1) calcining and crushing limestoneinto fine particles; adding hot water for digestion; (2) sieving to prepare emulsion; (3) after being diluted through adding water, placing the mixture in a micro-bubble type ultra-fine calcium carbonate synthesis reactor at the temperature of less than or equal to 30 DEG C; (4) introducing mixed gas during stirring; adding a crystal touch change modifier when the conductivity rises after firstlydropping to the bottom of a valley; standing when the conductivity rises to the initial value; introducing air until the pH value is 7 when the mixture is stirred again; (5) placing the mixture in areaction kettle for heating and heat preservation. Adding a surface touch change modifier and uniformly stirring; (6) filtering, drying and crushing. The obtained product can effectively improve the yield value of a rubber product under the condition of the same viscosity.

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 yield of PVC automobile undercoating glue. Background technique [0002] At present, most automotive undercoatings are PVC plastisol products, and the main components are base materials, fillers, plasticizers, adhesives and other auxiliary materials. PVC automotive undercoating requires good stone impact resistance, relatively low construction viscosity, and high yield value, so that it can be easily sprayed during the construction process, and can maintain its own shape without flowing after spraying. [0003] As a commonly used filler in automotive undercoatings, nano-calcium carbonate can not only reduce costs but also improve the rheological properties of automotive undercoatings; evaluate the effect of nano-calcium carbonate on the viscosity and yield value of PVC automotive adhesives Influence c...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y40/00C08K3/26C08L27/06
CPCB82Y40/00C01F11/183C01P2004/64C08K3/26C08K2003/265C08K2201/011C08L27/06
Inventor 陈晓龙于福家丛国龙胡杰
Owner NORTHEASTERN UNIV
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