阅读说明：本技术 一种pe吹膜专用纳米碳酸钙的制备方法 (Preparation method of special nano calcium carbonate for PE film blowing ) 是由 龚尚文 曹玉林 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种PE吹膜专用纳米碳酸钙的制备方法,包括如下具体制作方法：A、陈化后的氢氧化钙浆液经过悬液分离器和不锈钢筛网后,再将氢氧化钙浆液制成浓度为8-12％的生浆浆液,调整生浆浆液的温度为25-35℃。本发明涉及混凝土外加剂领域,通过添加硬脂酸钡、蓖麻酸钡、硬脂酸锌、硬脂酸镁、硬脂酸钙、蓖麻酸钙、硬脂酸镉、硬脂酸镧中的一种或者两种以上的混合物,将使形成的纳米碳酸钙可以稳定形成,并且保证纳米碳酸钙的形成环境可以保持相对稳定的状态。(The invention discloses a preparation method of special nano calcium carbonate for PE blown film, which comprises the following specific preparation method: A. and (3) after the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen, preparing the calcium hydroxide slurry into raw slurry with the concentration of 8-12%, and adjusting the temperature of the raw slurry to 25-35 ℃. The invention relates to the field of concrete admixtures, which can stably form the formed nano calcium carbonate by adding one or a mixture of more than two of barium stearate, barium ricinoleate, zinc stearate, magnesium stearate, calcium ricinoleate, cadmium stearate and lanthanum stearate, and ensure that the forming environment of the nano calcium carbonate can keep a relatively stable state.)

1. A preparation method of special nano calcium carbonate for PE blown film is characterized by comprising the following specific preparation methods:

A. after the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen mesh, preparing the calcium hydroxide slurry into raw slurry with the concentration of 8-12%, and adjusting the temperature of the raw slurry to 25-35 ℃;

B. preparing a solution of a crystal form control agent a, wherein the addition amount of the crystal form control agent a is 0.1-5.0% by mass and the concentration is 5.0-20.0%, adding the solution into a carbonization reaction kettle, and introducing carbon dioxide gas with the concentration of 26-35% and the temperature of less than 45 ℃ to react for 1-20min under stirring;

C. pumping the aged slurry into an activation barrel, keeping the temperature to be more than or equal to 75 ℃, adding a dispersing agent, wherein the adding amount of the dispersing agent is 3 parts of the solid content of the slurry, and adding a surface treating agent for surface activation treatment after 5-20 minutes, wherein the adding amount of the surface treating agent is 10 parts;

D. and adding a stabilizer in an amount of 2 parts by mass in the product drying process, and crushing and depolymerizing to obtain the product.

2. The method for preparing the special nano calcium carbonate for PE blown film according to claim 1, wherein the step A specifically comprises the following steps: the alkali is one or a mixture of more than two of triethanolamine, sodium hydroxide and potassium hydroxide, the crystal form control agent is added into the alkali solution, and the mixture is stirred and mixed uniformly.

3. The method for preparing the special nano calcium carbonate for PE film blowing according to claim 1, wherein in the step A: the fatty acid is one or more of myristic acid, stearic acid, palmitic acid, oleic acid, coconut oil, palm kernel oil, arachidic acid and behenic acid.

4. The method for preparing the special nano calcium carbonate for PE blown film according to claim 1, wherein the step B specifically comprises the following steps: the preparation process of the PE dispersing agent comprises the steps of adding 80 parts of water, 15 parts of acrylic acid, 10 parts of ethyl acrylate vinegar, 5 parts of butyl acrylate vinegar, 9 parts of sodium methallyl sulfonate and 4 parts of sodium sulfite into a reaction kettle with a stirrer according to parts by weight, uniformly stirring, heating to 75-80 ℃, preparing 20 parts of water and 2 parts of ammonium persulfate into a solution, finishing dropwise adding within 1 hour, heating to 85-90 ℃ after completing dropwise adding, and continuing to react for 2 hours to obtain the PE dispersing agent.

5. The method for preparing the special nano calcium carbonate for PE blown film according to claim 1, wherein in the step B: the crystal form control agent a is one or a mixture of more than two of zinc sulfate, sodium silicate and sodium carbonate.

6. The method for preparing the special nano calcium carbonate for PE blown film according to claim 1, wherein in the step B: the crystal form control agent b is one or a mixture of more than two of sucrose or citric acid.

7. The method for preparing the special nano calcium carbonate for PE blown film according to claim 1, wherein the step C specifically comprises the following steps: the following raw materials in parts by weight: 20-30 parts of calcium hydroxide, 10-20 parts of carbon dioxide, 10-20 parts of alkali, 1-2 parts of fatty acid, 2-5 parts of calcium carbonate, 1-3 parts of PE dispersing agent, 2-5 parts of crystal form control agent a1, 2-2 parts of crystal form control agent b1, 2-5 parts of stabilizer, 2-6 parts of pressure-sensitive adhesive and a proper amount of water.

8. The method for preparing the special nano calcium carbonate for PE film blowing according to claim 1, wherein in the step C: the stabilizer is one or a mixture of more than two of barium stearate, barium ricinoleate, zinc stearate, magnesium stearate, calcium ricinoleate, cadmium stearate and lanthanum stearate.

9. The method for preparing the special nano calcium carbonate for PE film blowing according to claim 1, wherein in the step C: the temperature of the water used is controlled to be 40-60 ℃, the using amount of the water is 5-6 times of the mass of the lime, the water is uniformly added into an ash melting machine for digestion to generate calcium hydroxide slurry, and the mass concentration of the calcium hydroxide is controlled to be 10-20% during digestion.

10. The preparation method of the nano calcium carbonate special for PE blown film according to claim 1, wherein the pressure-sensitive adhesive is one or a mixture of more than two of 2-ethylhexyl acrylate, acrylic acid or ethyl acetate.

Technical Field

The invention relates to the technical field of concrete admixtures, in particular to a preparation method of special nano calcium carbonate for PE film blowing.

Background

The nano calcium carbonate is also called ultra-fine calcium carbonate, the standard name is ultra-fine calcium carbonate, the most mature industry of the application of the nano calcium carbonate is that the plastic industry is mainly applied to high-grade plastic products, can improve the rheological property of the plastic master batch, improve the moldability thereof, has the functions of toughening and reinforcing when used as a plastic filler, improves the bending strength and the bending elastic modulus of the plastic, improves the thermal deformation temperature and the dimensional stability, meanwhile, the plastic is endowed with heat stagnation, the nano calcium carbonate shows excellent dispersibility and transparency, excellent gloss, excellent ink absorptivity and high drying property when being used in an ink product, the nano calcium carbonate is used as an ink filler in resin type ink, has the advantages of good stability, high gloss, no influence on the drying property of printing ink, strong adaptability and the like, however, the production environment is easy to change in the preparation process of the nano calcium carbonate, which results in the reduction of the yield of the nano calcium carbonate.

Therefore, we propose a preparation method of the special nano calcium carbonate for PE film blowing to solve the above problems.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a preparation method of special nano calcium carbonate for PE blown film.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of special nano calcium carbonate for PE blown film is characterized by comprising the following specific preparation methods:

A. after the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen mesh, preparing the calcium hydroxide slurry into raw slurry with the concentration of 8-12%, and adjusting the temperature of the raw slurry to 25-35 ℃;

B. preparing a solution of a crystal form control agent a, wherein the addition amount of the crystal form control agent a is 0.1-5.0% by mass and the concentration is 5.0-20.0%, adding the solution into a carbonization reaction kettle, and introducing carbon dioxide gas with the concentration of 26-35% and the temperature of less than 45 ℃ to react for 1-20min under stirring;

C. pumping the aged slurry into an activation barrel, keeping the temperature to be more than or equal to 75 ℃, adding a dispersing agent, wherein the adding amount of the dispersing agent is 3 parts of the solid content of the slurry, and adding a surface treating agent for surface activation treatment after 5-20 minutes, wherein the adding amount of the surface treating agent is 10 parts;

D. and adding a stabilizer in an amount of 2 parts by mass in the product drying process, and crushing and depolymerizing to obtain the product.

Preferably, the step a is specifically: the alkali is one or a mixture of more than two of triethanolamine, sodium hydroxide and potassium hydroxide, the crystal form control agent is added into the alkali solution, and the mixture is stirred and mixed uniformly.

Preferably, in the step a: the fatty acid is one or more of myristic acid, stearic acid, palmitic acid, oleic acid, coconut oil, palm kernel oil, arachidic acid and behenic acid.

Preferably, the step B specifically comprises: the preparation process of the PE dispersing agent comprises the steps of adding 80 parts of water, 15 parts of acrylic acid, 10 parts of ethyl acrylate vinegar, 5 parts of butyl acrylate vinegar, 9 parts of sodium methallyl sulfonate and 4 parts of sodium sulfite into a reaction kettle with a stirrer according to parts by weight, uniformly stirring, heating to 75-80 ℃, preparing 20 parts of water and 2 parts of ammonium persulfate into a solution, finishing dropwise adding within 1 hour, heating to 85-90 ℃ after completing dropwise adding, and continuing to react for 2 hours to obtain the PE dispersing agent.

Preferably, in the step B: the crystal form control agent a is one or a mixture of more than two of zinc sulfate, sodium silicate and sodium carbonate.

Preferably, in the step B: the crystal form control agent b is one or a mixture of more than two of sucrose or citric acid.

Preferably, the step C specifically includes: the following raw materials in parts by weight: 20-30 parts of calcium hydroxide, 10-20 parts of carbon dioxide, 10-20 parts of alkali, 1-2 parts of fatty acid, 2-5 parts of calcium carbonate, 1-3 parts of PE dispersing agent, 2-5 parts of crystal form control agent a1, 2-2 parts of crystal form control agent b1, 2-5 parts of stabilizer, 2-6 parts of pressure-sensitive adhesive and a proper amount of water.

Preferably, in the step C: the stabilizer is one or a mixture of more than two of barium stearate, barium ricinoleate, zinc stearate, magnesium stearate, calcium ricinoleate, cadmium stearate and lanthanum stearate;

preferably, in the step C: the temperature of the water used is controlled to be 40-60 ℃, the using amount of the water is 5-6 times of the mass of the lime, the water is uniformly added into an ash melting machine for digestion to generate calcium hydroxide slurry, and the mass concentration of the calcium hydroxide is controlled to be 10-20% during digestion.

Preferably, the pressure-sensitive adhesive is one or a mixture of more than two of 2-ethylhexyl acrylate, acrylic acid or ethyl acetate.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, by adding one or a mixture of more than two of barium stearate, barium ricinoleate, zinc stearate, magnesium stearate, calcium ricinoleate, cadmium stearate and lanthanum stearate, the formed nano calcium carbonate can be stably formed, and the forming environment of the nano calcium carbonate can be kept in a relatively stable state;

2. according to the invention, one or more than two of acrylic acid-2-ethyl hexyl ester, acrylic acid or ethyl acetate are added, so that various raw materials can be closely connected, and the stable generation of nano calcium carbonate is ensured;

3. according to the invention, one or a mixture of more than two of triethanolamine, sodium hydroxide and potassium hydroxide is added, so that the pH value of the environment for generating the nano calcium carbonate can be recovered to be alkaline, and the generation amount of the nano calcium carbonate is increased.

Detailed Description

Example 1

A preparation method of special nanometer calcium carbonate for PE blown film comprises the following specific preparation method:

A. after the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen mesh, preparing the calcium hydroxide slurry into raw slurry with the concentration of 8-12%, and adjusting the temperature of the raw slurry to 25-35 ℃;

B. preparing a solution of a crystal form control agent a, wherein the addition amount of the crystal form control agent a is 0.1-5.0% by mass and the concentration is 5.0-20.0%, adding the solution into a carbonization reaction kettle, and introducing carbon dioxide gas with the concentration of 26-35% and the temperature of less than 45 ℃ to react for 1-20min under stirring;

C. pumping the aged slurry into an activation barrel, keeping the temperature to be more than or equal to 75 ℃, adding a dispersing agent, wherein the adding amount of the dispersing agent is 3 parts of the solid content of the slurry, and adding a surface treating agent for surface activation treatment after 5-20 minutes, wherein the adding amount of the surface treating agent is 10 parts;

D. and adding a stabilizer in an amount of 2 parts by mass in the product drying process, and crushing and depolymerizing to obtain the product.

In this embodiment, step a specifically includes: the alkali is one or a mixture of more than two of triethanolamine, sodium hydroxide and potassium hydroxide, the crystal form control agent is added into the alkali solution, and the mixture is stirred and mixed uniformly.

In this embodiment, step a: the fatty acid is one or more of myristic acid, stearic acid, palmitic acid, oleic acid, coconut oil, palm kernel oil, arachidic acid, and behenic acid.

In this embodiment, step B specifically includes: the preparation process of the PE dispersing agent comprises the steps of adding 80 parts of water, 15 parts of acrylic acid, 10 parts of ethyl acrylate vinegar, 5 parts of butyl acrylate vinegar, 9 parts of sodium methallyl sulfonate and 4 parts of sodium sulfite into a reaction kettle with a stirrer according to parts by weight, uniformly stirring, heating to 75-80 ℃, preparing 20 parts of water and 2 parts of ammonium persulfate into a solution, finishing dropwise adding within 1 hour, heating to 85-90 ℃ after completing dropwise adding, and continuing to react for 2 hours to obtain the PE dispersing agent.

In this embodiment, step B: the crystal form control agent a is one or a mixture of more than two of zinc sulfate, sodium silicate and sodium carbonate.

In this embodiment, step B: the crystal form control agent b is one or a mixture of more than two of sucrose or citric acid.

In this embodiment, step C specifically includes: the following raw materials in parts by weight: 20-30 parts of calcium hydroxide, 10-20 parts of carbon dioxide, 10-20 parts of alkali, 1-2 parts of fatty acid, 2-5 parts of calcium carbonate, 1-3 parts of PE dispersing agent, 2-5 parts of crystal form control agent a1, 2-2 parts of crystal form control agent b1, 2-5 parts of stabilizer, 2 parts of pressure-sensitive adhesive and a proper amount of water.

In this embodiment, step C: the stabilizer is one or more of barium stearate, barium ricinoleate, zinc stearate, magnesium stearate, calcium ricinoleate, cadmium stearate and lanthanum stearate.

In this embodiment, step C: controlling the temperature of water to be 40-60 ℃, controlling the using amount of the water to be 5-6 times of the mass of the lime, uniformly adding the water into an ash melting machine for digestion to generate calcium hydroxide slurry, and controlling the mass concentration of the calcium hydroxide to be 10-20% during digestion.

In this embodiment, the pressure-sensitive adhesive is one or a mixture of two or more of 2-ethylhexyl acrylate, acrylic acid, or ethyl acetate.

Example 2

A preparation method of special nanometer calcium carbonate for PE blown film comprises the following specific preparation method:

A. after the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen mesh, preparing the calcium hydroxide slurry into raw slurry with the concentration of 8-12%, and adjusting the temperature of the raw slurry to 25-35 ℃;

B. preparing a solution of a crystal form control agent a, wherein the addition amount of the crystal form control agent a is 0.1-5.0% by mass and the concentration is 5.0-20.0%, adding the solution into a carbonization reaction kettle, and introducing carbon dioxide gas with the concentration of 26-35% and the temperature of less than 45 ℃ to react for 1-20min under stirring;

C. pumping the aged slurry into an activation barrel, keeping the temperature to be more than or equal to 75 ℃, adding a dispersing agent, wherein the adding amount of the dispersing agent is 3 parts of the solid content of the slurry, and adding a surface treating agent for surface activation treatment after 5-20 minutes, wherein the adding amount of the surface treating agent is 10 parts;

D. and adding a stabilizer in an amount of 2 parts by mass in the product drying process, and crushing and depolymerizing to obtain the product.

In this embodiment, step a specifically includes: the alkali is one or a mixture of more than two of triethanolamine, sodium hydroxide and potassium hydroxide, the crystal form control agent is added into the alkali solution, and the mixture is stirred and mixed uniformly.

In this embodiment, step a: the fatty acid is one or more of myristic acid, stearic acid, palmitic acid, oleic acid, coconut oil, palm kernel oil, arachidic acid, and behenic acid.

In this embodiment, step B specifically includes: the preparation process of the PE dispersing agent comprises the steps of adding 80 parts of water, 15 parts of acrylic acid, 10 parts of ethyl acrylate vinegar, 5 parts of butyl acrylate vinegar, 9 parts of sodium methallyl sulfonate and 4 parts of sodium sulfite into a reaction kettle with a stirrer according to parts by weight, uniformly stirring, heating to 75-80 ℃, preparing 20 parts of water and 2 parts of ammonium persulfate into a solution, finishing dropwise adding within 1 hour, heating to 85-90 ℃ after completing dropwise adding, and continuing to react for 2 hours to obtain the PE dispersing agent.

In this embodiment, step B: the crystal form control agent a is one or a mixture of more than two of zinc sulfate, sodium silicate and sodium carbonate.

In this embodiment, step B: the crystal form control agent b is one or a mixture of more than two of sucrose or citric acid.

In this embodiment, step C specifically includes: the following raw materials in parts by weight: 20-30 parts of calcium hydroxide, 10-20 parts of carbon dioxide, 10-20 parts of alkali, 1-2 parts of fatty acid, 2-5 parts of calcium carbonate, 1-3 parts of PE dispersing agent, 2-5 parts of crystal form control agent a1, 2-2 parts of crystal form control agent b1, 2-5 parts of stabilizer, 3 parts of pressure-sensitive adhesive and a proper amount of water.

In this embodiment, step C: the stabilizer is one or more of barium stearate, barium ricinoleate, zinc stearate, magnesium stearate, calcium ricinoleate, cadmium stearate and lanthanum stearate.

In this embodiment, step C: controlling the temperature of water to be 40-60 ℃, controlling the using amount of the water to be 5-6 times of the mass of the lime, uniformly adding the water into an ash melting machine for digestion to generate calcium hydroxide slurry, and controlling the mass concentration of the calcium hydroxide to be 10-20% during digestion.

In this embodiment, the pressure-sensitive adhesive is one or a mixture of two or more of 2-ethylhexyl acrylate, acrylic acid, or ethyl acetate.

Example 3

A preparation method of special nanometer calcium carbonate for PE blown film comprises the following specific preparation method:

A. after the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen mesh, preparing the calcium hydroxide slurry into raw slurry with the concentration of 8-12%, and adjusting the temperature of the raw slurry to 25-35 ℃;

B. preparing a solution of a crystal form control agent a, wherein the addition amount of the crystal form control agent a is 0.1-5.0% by mass and the concentration is 5.0-20.0%, adding the solution into a carbonization reaction kettle, and introducing carbon dioxide gas with the concentration of 26-35% and the temperature of less than 45 ℃ to react for 1-20min under stirring;

C. pumping the aged slurry into an activation barrel, keeping the temperature to be more than or equal to 75 ℃, adding a dispersing agent, wherein the adding amount of the dispersing agent is 3 parts of the solid content of the slurry, and adding a surface treating agent for surface activation treatment after 5-20 minutes, wherein the adding amount of the surface treating agent is 10 parts;

D. and adding a stabilizer in an amount of 2 parts by mass in the product drying process, and crushing and depolymerizing to obtain the product.

In this embodiment, step a specifically includes: the alkali is one or a mixture of more than two of triethanolamine, sodium hydroxide and potassium hydroxide, the crystal form control agent is added into the alkali solution, and the mixture is stirred and mixed uniformly.

In this embodiment, step a: the fatty acid is one or more of myristic acid, stearic acid, palmitic acid, oleic acid, coconut oil, palm kernel oil, arachidic acid, and behenic acid.

In this embodiment, step B specifically includes: the preparation process of the PE dispersing agent comprises the steps of adding 80 parts of water, 15 parts of acrylic acid, 10 parts of ethyl acrylate vinegar, 5 parts of butyl acrylate vinegar, 9 parts of sodium methallyl sulfonate and 4 parts of sodium sulfite into a reaction kettle with a stirrer according to parts by weight, uniformly stirring, heating to 75-80 ℃, preparing 20 parts of water and 2 parts of ammonium persulfate into a solution, finishing dropwise adding within 1 hour, heating to 85-90 ℃ after completing dropwise adding, and continuing to react for 2 hours to obtain the PE dispersing agent.

In this embodiment, step B: the crystal form control agent a is one or a mixture of more than two of zinc sulfate, sodium silicate and sodium carbonate.

In this embodiment, step B: the crystal form control agent b is one or a mixture of more than two of sucrose or citric acid.

In this embodiment, step C specifically includes: the following raw materials in parts by weight: 20-30 parts of calcium hydroxide, 10-20 parts of carbon dioxide, 10-20 parts of alkali, 1-2 parts of fatty acid, 2-5 parts of calcium carbonate, 1-3 parts of PE dispersing agent, 2-5 parts of crystal form control agent a1, 2-2 parts of crystal form control agent b1, 2-5 parts of stabilizer, 4 parts of pressure-sensitive adhesive and a proper amount of water.

In this embodiment, step C: the stabilizer is one or more of barium stearate, barium ricinoleate, zinc stearate, magnesium stearate, calcium ricinoleate, cadmium stearate and lanthanum stearate.

In this embodiment, step C: controlling the temperature of water to be 40-60 ℃, controlling the using amount of the water to be 5-6 times of the mass of the lime, uniformly adding the water into an ash melting machine for digestion to generate calcium hydroxide slurry, and controlling the mass concentration of the calcium hydroxide to be 10-20% during digestion.

In this embodiment, the pressure-sensitive adhesive is one or a mixture of two or more of 2-ethylhexyl acrylate, acrylic acid, or ethyl acetate.

Example 4

A preparation method of special nanometer calcium carbonate for PE blown film comprises the following specific preparation method:

A. after the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen mesh, preparing the calcium hydroxide slurry into raw slurry with the concentration of 8-12%, and adjusting the temperature of the raw slurry to 25-35 ℃;

B. preparing a solution of a crystal form control agent a, wherein the addition amount of the crystal form control agent a is 0.1-5.0% by mass and the concentration is 5.0-20.0%, adding the solution into a carbonization reaction kettle, and introducing carbon dioxide gas with the concentration of 26-35% and the temperature of less than 45 ℃ to react for 1-20min under stirring;

C. pumping the aged slurry into an activation barrel, keeping the temperature to be more than or equal to 75 ℃, adding a dispersing agent, wherein the adding amount of the dispersing agent is 3 parts of the solid content of the slurry, and adding a surface treating agent for surface activation treatment after 5-20 minutes, wherein the adding amount of the surface treating agent is 10 parts;

D. and adding a stabilizer in an amount of 2 parts by mass in the product drying process, and crushing and depolymerizing to obtain the product.

In this embodiment, step a specifically includes: the alkali is one or a mixture of more than two of triethanolamine, sodium hydroxide and potassium hydroxide, the crystal form control agent is added into the alkali solution, and the mixture is stirred and mixed uniformly.

In this embodiment, step a: the fatty acid is one or more of myristic acid, stearic acid, palmitic acid, oleic acid, coconut oil, palm kernel oil, arachidic acid, and behenic acid.

In this embodiment, step B specifically includes: the preparation process of the PE dispersing agent comprises the steps of adding 80 parts of water, 15 parts of acrylic acid, 10 parts of ethyl acrylate vinegar, 5 parts of butyl acrylate vinegar, 9 parts of sodium methallyl sulfonate and 4 parts of sodium sulfite into a reaction kettle with a stirrer according to parts by weight, uniformly stirring, heating to 75-80 ℃, preparing 20 parts of water and 2 parts of ammonium persulfate into a solution, finishing dropwise adding within 1 hour, heating to 85-90 ℃ after completing dropwise adding, and continuing to react for 2 hours to obtain the PE dispersing agent.

In this embodiment, step B: the crystal form control agent a is one or a mixture of more than two of zinc sulfate, sodium silicate and sodium carbonate.

In this embodiment, step B: the crystal form control agent b is one or a mixture of more than two of sucrose or citric acid.

In this embodiment, step C specifically includes: the following raw materials in parts by weight: 20-30 parts of calcium hydroxide, 10-20 parts of carbon dioxide, 10-20 parts of alkali, 1-2 parts of fatty acid, 2-5 parts of calcium carbonate, 1-3 parts of PE dispersing agent, 2-5 parts of crystal form control agent a1, 2-2 parts of crystal form control agent b1, 2-5 parts of stabilizer, 5 parts of pressure-sensitive adhesive and a proper amount of water.

In this embodiment, step C: the stabilizer is one or more of barium stearate, barium ricinoleate, zinc stearate, magnesium stearate, calcium ricinoleate, cadmium stearate and lanthanum stearate.

In this embodiment, step C: controlling the temperature of water to be 40-60 ℃, controlling the using amount of the water to be 5-6 times of the mass of the lime, uniformly adding the water into an ash melting machine for digestion to generate calcium hydroxide slurry, and controlling the mass concentration of the calcium hydroxide to be 10-20% during digestion.

In this embodiment, the pressure-sensitive adhesive is one or a mixture of two or more of 2-ethylhexyl acrylate, acrylic acid, or ethyl acetate.

Example 5

A preparation method of special nanometer calcium carbonate for PE blown film comprises the following specific preparation method:

A. after the aged calcium hydroxide slurry passes through a suspension separator and a stainless steel screen mesh, preparing the calcium hydroxide slurry into raw slurry with the concentration of 8-12%, and adjusting the temperature of the raw slurry to 25-35 ℃;

B. preparing a solution of a crystal form control agent a, wherein the addition amount of the crystal form control agent a is 0.1-5.0% by mass and the concentration is 5.0-20.0%, adding the solution into a carbonization reaction kettle, and introducing carbon dioxide gas with the concentration of 26-35% and the temperature of less than 45 ℃ to react for 1-20min under stirring;

C. pumping the aged slurry into an activation barrel, keeping the temperature to be more than or equal to 75 ℃, adding a dispersing agent, wherein the adding amount of the dispersing agent is 3 parts of the solid content of the slurry, and adding a surface treating agent for surface activation treatment after 5-20 minutes, wherein the adding amount of the surface treating agent is 10 parts;

D. and adding a stabilizer in an amount of 2 parts by mass in the product drying process, and crushing and depolymerizing to obtain the product.

In this embodiment, step a specifically includes: the alkali is one or a mixture of more than two of triethanolamine, sodium hydroxide and potassium hydroxide, the crystal form control agent is added into the alkali solution, and the mixture is stirred and mixed uniformly.

In this embodiment, step a: the fatty acid is one or more of myristic acid, stearic acid, palmitic acid, oleic acid, coconut oil, palm kernel oil, arachidic acid, and behenic acid.

In this embodiment, step B specifically includes: the preparation process of the PE dispersing agent comprises the steps of adding 80 parts of water, 15 parts of acrylic acid, 10 parts of ethyl acrylate vinegar, 5 parts of butyl acrylate vinegar, 9 parts of sodium methallyl sulfonate and 4 parts of sodium sulfite into a reaction kettle with a stirrer according to parts by weight, uniformly stirring, heating to 75-80 ℃, preparing 20 parts of water and 2 parts of ammonium persulfate into a solution, finishing dropwise adding within 1 hour, heating to 85-90 ℃ after completing dropwise adding, and continuing to react for 2 hours to obtain the PE dispersing agent.

In this embodiment, step B: the crystal form control agent a is one or a mixture of more than two of zinc sulfate, sodium silicate and sodium carbonate.

In this embodiment, step B: the crystal form control agent b is one or a mixture of more than two of sucrose or citric acid.

In this embodiment, step C specifically includes: the following raw materials in parts by weight: 20-30 parts of calcium hydroxide, 10-20 parts of carbon dioxide, 10-20 parts of alkali, 1-2 parts of fatty acid, 2-5 parts of calcium carbonate, 1-3 parts of PE dispersing agent, 2-5 parts of crystal form control agent a1, 2-2 parts of crystal form control agent b1, 2-5 parts of stabilizer, 6 parts of pressure-sensitive adhesive and a proper amount of water.

In this embodiment, step C: the stabilizer is one or more of barium stearate, barium ricinoleate, zinc stearate, magnesium stearate, calcium ricinoleate, cadmium stearate and lanthanum stearate.

In this embodiment, step C: controlling the temperature of water to be 40-60 ℃, controlling the using amount of the water to be 5-6 times of the mass of the lime, uniformly adding the water into an ash melting machine for digestion to generate calcium hydroxide slurry, and controlling the mass concentration of the calcium hydroxide to be 10-20% during digestion.

In this embodiment, the pressure-sensitive adhesive is one or a mixture of two or more of 2-ethylhexyl acrylate, acrylic acid, or ethyl acetate.

The nano calcium carbonate was prepared according to the methods of examples 1 to 5 and comparative example, and the properties thereof were tested as follows, and the test results are shown in the following table:

and (4) analyzing results:

when the amount of the pressure-sensitive adhesive exceeds 3 parts, the production environment stability degree is decreased, which indicates that the more the pressure-sensitive adhesive is, the better the pressure-sensitive adhesive is, and the production environment stability degree is decreased after 15 parts of the pressure-sensitive adhesive, which indicates that the repair condition of the pressure-sensitive adhesive is normally distributed according to the amount of the pressure-sensitive adhesive, and indicates that the pressure-sensitive adhesive can not be used excessively, thereby avoiding waste.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.