Production method of nanometer calcium carbonate for PE direct film blowing

A technology of nano-calcium carbonate and production methods, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problem of high cost and input cost, difficulty in meeting energy saving and consumption reduction, etc. problems, to achieve the effect of improving mechanical properties, improving melt viscosity, ensuring transparency and gloss

Inactive Publication Date: 2020-08-21
建德市双超钙业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the processing method adopted by the domestic PE blown film industry is to first knead the PE material and calcium carbonate into a PE masterbatch, and then use the masterbatch to process the blown film. Therefore, granulation must be performed in the PE blown film production process. process, so it is difficult to meet the requirements of energy saving and consumption reduction, and the cost and input cost are high

Method used

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  • Production method of nanometer calcium carbonate for PE direct film blowing
  • Production method of nanometer calcium carbonate for PE direct film blowing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of production method of the nano-calcium carbonate that is used for PE blown film directly, comprises the steps:

[0042] S1. After the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen, the calcium hydroxide slurry is made into a raw slurry with a concentration of 10%, and the temperature of the raw slurry is adjusted to be 30° C.;

[0043] S2. Prepare a solution of crystal form control agent a. The mass percentage of crystal form control agent a is 2.55%, and the concentration is 12.5%. Add it into the carbonization reaction kettle, and pass it under stirring. Carbon dioxide gas reaction for 10.5 minutes;

[0044] S3. After the completion of S2, add the raw slurry of S1 and the crystal form control agent b into the carbonization tower, the mass percentage of the crystal form control agent b is 0.55%, and continue to feed carbon dioxide after stirring for 20 minutes until PH<7.0 The carbonization reaction is comple...

Embodiment 2

[0057] A kind of production method of the nano-calcium carbonate that is used for PE blown film directly, comprises the steps:

[0058] S1. After the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen, the calcium hydroxide slurry is made into a raw slurry with a concentration of 8%, and the temperature of the raw slurry is adjusted to be 35° C.;

[0059] S2. Prepare the solution of crystal form control agent a, the mass percentage of crystal form control agent a is 0.1%, the concentration is 20.0%, add it into the carbonization reaction kettle, and pass it under stirring with a concentration of 26% and a temperature <45°C Carbon dioxide gas reaction for 20 minutes;

[0060] S3. After the completion of S2, add the raw slurry of S1 and the crystal form control agent b into the carbonization tower, the mass percentage of the crystal form control agent b is 0.3%, and continue to feed carbon dioxide after stirring for 20 minutes until ...

Embodiment 3

[0073] A kind of production method of the nano-calcium carbonate that is used for PE blown film directly, comprises the steps:

[0074] S1. After the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen, the calcium hydroxide slurry is made into a raw slurry with a concentration of 12%, and the temperature of the raw slurry is adjusted to be 25° C.;

[0075] S2. Prepare a solution of crystal form control agent a. The mass percentage of crystal form control agent a is 5.0%, and the concentration is 5.0%. Add it into the carbonization reaction kettle, and feed it with a concentration of 35% and a temperature <45°C under stirring. Carbon dioxide gas reaction for 1min;

[0076] S3. After the completion of S2, add the raw slurry of S1 and the crystal form control agent b into the carbonization tower, the mass percentage of the crystal form control agent b is 0.8%, and continue to feed carbon dioxide after stirring for 20 minutes until PH<...

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Abstract

The invention discloses a production method of nanometer calcium carbonate for PE direct film blowing. The production method comprises the following steps: S1, preparing raw slurry of calcium hydroxide; S2, preparing a solution of a crystal form control agent a; S3, after step S2 is finished, adding the raw slurry obtained in step S1 and a crystal form control agent b into a carbonization tower, and carrying out carbonization treatment; S4, aging the slurry obtained by carbonization, detecting the pH value, and if the pH value is greater than 7.0, introducing carbon dioxide until the pH valueis less than 7.0; S5, carrying out surface activation treatment on the aged slurry; S6, cooling the activated slurry, carrying out filter pressing, and drying; and S7, adding a heat stabilizer in thedrying process of the product, and crushing and depolymerizing to obtain the product. The nanometer calcium carbonate prepared by the production method disclosed by the invention can omit a granulation process in a PE film blowing process, and meets the requirements of energy conservation, environmental protection and consumption reduction.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-calcium carbonate, and in particular relates to a production method of nano-calcium carbonate used for PE direct film blowing. Background technique [0002] Nano-calcium carbonate, also known as ultra-fine calcium carbonate, is the most mature industry in the plastic industry. It is mainly used in high-grade plastic products. It can improve the rheology of plastic masterbatch and improve its formability. It has toughening properties when used as plastic filler. The role of reinforcement can improve the flexural strength, flexural modulus, thermal deformation temperature and dimensional stability of plastics. Secondly, nano-calcium carbonate is used as ink filler in resin-based inks, which has good stability and high gloss. Printing ink drying performance, strong adaptability and other advantages. [0003] At present, the processing method adopted by the domestic PE blown film industry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C08K9/04C08K9/02C08K3/26C08K9/10C08J5/18C08L23/06
CPCC01F11/182C01F11/183C01F11/185C08K9/04C08K9/08C08K9/02C08K3/26C08K9/10C08J5/18C08K2201/011C08K2003/265C08J2423/06
Inventor 洪宇锋王璟琳
Owner 建德市双超钙业有限公司
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