阅读说明：本技术 一种碳酸钙研磨助剂 (Calcium carbonate grinding aid ) 是由 毕文志 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种碳酸钙研磨助剂,涉及研磨助剂领域,旨在解决现有技术中助剂添加量较大,研磨颗粒粒径大、流动性差、经济附加值低的问题,采用的技术方案是,包括2-氨基-2-甲基-丙醇、表面活性剂、二甘醇、丙三醇和丙二醇,通过增加分散剂,使颜料发挥最优化的分散效果,增加了碳酸钙的流动性；表面活性剂能够用来降低碳酸钙表面吸油值,防止再聚积；丙二醇能够使助剂扩散更加均匀；本研磨助剂在研磨碳酸钙时,研磨1吨碳酸钙仅需添加1.2-2公斤,极大的减少了助剂添加量,且改善了碳酸钙的流动性,缩短了研磨时间,降低生产成本,提高了产品附加值,本研磨助剂可使碳酸钙粒径达到2-5μm,极大提升了经济效益。(The invention discloses a calcium carbonate grinding aid, which relates to the field of grinding aids and aims to solve the problems of large addition amount of the aid, large particle size of grinding particles, poor fluidity and low economic added value in the prior art, and adopts the technical scheme that the calcium carbonate grinding aid comprises 2-amino-2-methyl-propanol, a surfactant, diethylene glycol, glycerol and propylene glycol, and the pigment can exert the optimal dispersion effect by adding a dispersing agent, so that the fluidity of calcium carbonate is increased; the surfactant can be used for reducing the oil absorption value of the surface of the calcium carbonate and preventing re-accumulation; the propylene glycol can enable the auxiliary agent to be diffused more uniformly; when the grinding aid is used for grinding calcium carbonate, only 1.2-2 kg of the grinding aid is needed to be added for grinding 1 ton of calcium carbonate, so that the addition amount of the aid is greatly reduced, the fluidity of the calcium carbonate is improved, the grinding time is shortened, the production cost is reduced, the added value of the product is improved, the particle size of the calcium carbonate can reach 2-5 mu m, and the economic benefit is greatly improved.)

1. The calcium carbonate grinding aid is characterized by comprising the following components:

2-amino-2-methyl-propanol, a surfactant, diethylene glycol, glycerol and propylene glycol.

2. The calcium carbonate grinding aid according to claim 1, characterized in that: the surfactant adopts organic silicon polyether and titanate coupling agent.

3. The calcium carbonate grinding aid according to claim 2, wherein the grinding aid comprises the following components in parts by mass:

5-25% of 2-amino-2-methyl-propanol, 0.1-10% of organic silicon polyether, 0.1-10% of carbonate coupling agent, 0.1-10% of diethylene glycol, 5-25% of glycerol and 5-60% of propylene glycol.

4. A calcium carbonate grinding aid according to claim 3, characterized in that: the 2-amino-2-methyl-propanol may be partially replaced by triethanolamine.

5. A calcium carbonate grinding aid according to claim 3, characterized in that: the propylene glycol may be partially replaced with ethylene glycol.

6. A calcium carbonate grinding aid according to claim 3, characterized in that: water is also included.

7. The grinding aid for calcium carbonate according to claim 6, wherein: the water is deionized water.

8. The grinding aid for calcium carbonate according to claim 7, wherein: the mass fraction of the deionized water is 0-15%.

Technical Field

The invention relates to the field of grinding aids, in particular to a calcium carbonate grinding aid.

Background

Calcium carbonate is an inorganic compound of the formula CaCO₃Limestone, stone powder, etc. Calcium carbonate is basic, substantially insoluble in water, and soluble in hydrochloric acid. It is one of the common substances on earth, and exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocksThe major component of the bone or shell of certain animals. Calcium carbonate is also an important building material and has a wide range of industrial applications.

Calcium carbonate is further classified into heavy calcium carbonate and light calcium carbonate.

Ground calcium carbonate, called triple superphosphate for short, is ground from natural carbonate minerals such as calcite, marble and limestone. The inorganic filler is a common powdery inorganic filler and has the advantages of high chemical purity, high inertia, difficult chemical reaction, good thermal stability, no decomposition at the temperature of below 400 ℃, high whiteness, low oil absorption rate, low refractive index, soft quality, dryness, no crystal water, low hardness, low abrasion value, no toxicity, no odor, good dispersibility and the like.

There are two kinds of production process flow of heavy calcium carbonate. The dry production process flow comprises the following steps: firstly, manually selecting calcite, limestone, chalk, shells and the like transported from a quarry to remove gangue; and then coarsely crushing the limestone by using a crusher, grinding and crushing to obtain fine limestone powder, grading the ground powder by using a grading machine, packaging and warehousing the powder meeting the granularity requirement as a product, and otherwise, returning the product to the grinding machine for grinding again. The wet production process flow comprises the following steps: the dry fine powder is made into suspension which is further crushed in a mill, and the superfine heavy calcium carbonate is prepared after dehydration and drying.

The heavy calcium carbonate is irregular in shape, the particle size difference is large, the particles have certain edges and corners, the surface is rough, the particle size distribution is wide, the particle size is large, and the average particle size is generally 1-10 mu m. The heavy calcium carbonate is divided into the following components according to the primary average particle size: coarse grinding calcium carbonate (>3 μm), fine grinding calcium carbonate (1-3 μm), and superfine calcium carbonate (0.5-1 μm);

the powder characteristics of the heavy calcium carbonate are as follows: a. the shape of the particles is irregular; b. the particle size distribution is wide; c. the particle size is larger.

The calcium carbonate grinding aid is powdery before, and is gradually eliminated because the calcium carbonate grinding aid is remained in calcium carbonate powder; the liquid grinding aid adopted by the current enterprises for producing calcium carbonate is propylene glycol, but the effect is not ideal, the addition amount is large, the propylene glycol added in grinding one ton of calcium carbonate reaches 8 kg, the particle size of the ground calcium carbonate can only reach 800 meshes (15 mu m), the particle size is large, the ground calcium carbonate has poor fluidity and the economic added value is low.

Disclosure of Invention

In view of the problems in the prior art, the invention discloses a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components: 2-amino-2-methyl-propanol, a surfactant, diethylene glycol, glycerol and propylene glycol.

2-amino-2-methyl-propanol, namely isopropanol amine, is a powerful dispersant, so that the pigment can exert the optimal dispersion effect, has excellent stability, can wet calcium carbonate well, and can increase the fluidity of the calcium carbonate and reduce the particle size along with the increase of the dosage of the 2-amino-2-methyl-propanol, but the grinding of the calcium carbonate can achieve the ideal effect when the dosage of the 2-amino-2-methyl-propanol reaches 25 percent in consideration of cost factors, so the dosage is not increased any more.

Diethylene glycol, also called diethylene glycol, is a polyol of formula C₄H₁₀O₃Colorless, odorless, transparent, hygroscopic viscous liquid, spicy sweet taste, no corrosiveness and low toxicity; the addition of diethylene glycol in the grinding aid can increase lubricity.

Glycerol, also known as glycerin, of the formula C₃H₈O₃The water-soluble organic triglyceride is colorless, odorless and sweet, has a clear and viscous liquid appearance, is an organic substance, can absorb moisture from the air, can also absorb hydrogen sulfide, hydrogen cyanide and sulfur dioxide, is insoluble in benzene, chloroform, carbon tetrachloride, carbon disulfide, petroleum ether and oils, and is a framework component of triglyceride molecules; in the process of grinding calcium carbonate, high-temperature heating can be generated, and the glycerol is used for stabilizing the auxiliary agent, resisting high temperature and avoiding premature volatilization of the auxiliary agent.

Propylene glycol, 1, 2-propylene glycol, is an organic compound with chemical formula C₃H₈O₂The grinding aid is mixed and dissolved with water, ethanol and various organic solvents, is colorless viscous liquid in a normal state, is nearly tasteless, smells slightly sweet, and is used as a solvent and a carrier in the grinding aid, so that the grinding aid is more uniformly dispersed and fully volatilized.

As a preferred technical scheme of the invention, the surfactant adopts organic silicon polyether and titanate coupling agent;

the organic silicon polyether is also called polyether modified silicone oil, is an organic silicon nonionic surfactant with unique performance which is prepared by graft copolymerization of polyether and dimethyl siloxane, has good lubricity, lower surface tension and good leveling property, can be mutually dissolved with water in any proportion, can also be mutually dissolved with polar organic solvents such as alcohol, DMF, ether, ester and the like, is partially or completely mutually dissolved with nonpolar solvents such as toluene, alkane and the like, and is very convenient to use;

the titanate coupling agent is applied to the pigment industry, and can obviously improve the pigment dispersibility. The grinding dispersion time can be shortened, and the product has bright color;

the grinding aid is added with the organic silicon polyether and titanate coupling agent, so that the surface tension can be reduced, the oil absorption value of calcium carbonate can be reduced, and the particles can be prevented from accumulating again.

As a preferred technical scheme of the invention, the components are mixed according to the mass fraction as follows: 5-25% of 2-amino-2-methyl-propanol, 0.1-10% of organic silicon polyether, 0.1-10% of carbonate coupling agent, 0.1-10% of diethylene glycol, 5-25% of glycerol and 5-60% of propylene glycol;

the proportion is the mass fraction proportion of pure auxiliary agent.

As a preferable embodiment of the present invention, the 2-amino-2-methyl-propanol may be partially replaced with triethanolamine to reduce the cost, but when the amount is more than 25%, the hygroscopicity of calcium carbonate is increased, which is not favorable for storage stability.

As a preferred technical solution of the present invention, the propylene glycol can be partially replaced by ethylene glycol to reduce the cost, and due to some industrial limitations, propylene glycol is still mainly used, and ethylene glycol (ethylene glycol) is also called ethylene glycol or 1, 2-ethylene glycol, abbreviated as EG, and is the simplest diol, and ethylene glycol is colorless, odorless and sweet liquid; ethylene glycol can be mutually soluble with water and acetone, but has lower solubility in ethers; used as solvent, antifreezing agent and raw material for synthesizing terylene.

As a preferred technical scheme of the invention, the water-saving paint also comprises deionized water for reducing the cost.

The calcium carbonate grinding aid disclosed by the invention is used for vertical ball milling, vertical milling and ring roller milling, and has an obvious grinding effect; when the deionized water is used for vertical ball milling or ring roller milling, deionized water is not added, and when the deionized water is used for vertical milling, the deionized water is added according to requirements.

As a preferred technical scheme of the invention, the mass fraction of the deionized water is 0-15%; when deionized water is added, the mass fraction ratio of each component of the calcium carbonate synthetic auxiliary agent is changed according to the equal proportion of the added deionized water.

The invention has the beneficial effects that: the pigment has the advantages that the dispersant is added, so that the pigment has the optimal dispersing effect, the stability is excellent, and the fluidity of calcium carbonate is increased; the surfactant can be used for reducing the oil absorption value of the surface of the calcium carbonate and preventing re-accumulation; the lubricity can be improved by diethylene glycol, the auxiliary agent can be stabilized by glycerol, the glycerol is high-temperature resistant and can prevent premature volatilization, and the auxiliary agent can be more uniformly diffused by propylene glycol; when the grinding aid is used for grinding calcium carbonate, 1.2-2 kg of calcium carbonate grinding aid is added into 1 ton of ground calcium carbonate, the particle size of the calcium carbonate can reach 2-5 mu m, and can reach 0.5-1 mu m along with the continuous increase of the using amount, the addition amount of the calcium carbonate grinding aid is reduced, the fluidity of the calcium carbonate is improved, the grinding time is shortened, the production cost is reduced, and the economic added value of the product is improved.

Furthermore, the market price of the calcium carbonate with the particle size of 15 mu m is 460-one 600 yuan/ton, and the market price of the calcium carbonate with the particle size of 2-5 mu m ground by using the calcium carbonate grinding aid is 1200-one 2000 yuan/ton, so that the economic benefit is obviously improved.

Detailed Description

Example 1

The invention discloses a first implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, a surfactant, diethylene glycol, glycerol and propylene glycol.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, the components are mixed according to the mass fraction as follows: 10% of 2-amino-2-methyl-propanol, 5% of silicone polyether, 5% of carbonate coupling agent, 6% of diethylene glycol, 15% of glycerol and 59% of propylene glycol.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical ball milling or ring roller milling.

Example 2

The invention discloses a second implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, a surfactant, diethylene glycol, glycerol and propylene glycol.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, the components are mixed according to the mass fraction as follows: 15% of 2-amino-2-methyl-propanol, 8% of silicone polyether, 8% of carbonate coupling agent, 8% of diethylene glycol, 20% of glycerol and 41% of propylene glycol.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical ball milling or ring roller milling.

Example 3

The invention discloses a third implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, a surfactant, diethylene glycol, glycerol and propylene glycol.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, the components are mixed according to the mass fraction as follows: 20% of 2-amino-2-methyl-propanol, 10% of silicone polyether, 10% of carbonate coupling agent, 10% of diethylene glycol, 25% of glycerol and 25% of propylene glycol.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical ball milling or ring roller milling.

Example 4

The invention discloses a fourth implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, a surfactant, diethylene glycol, glycerol and propylene glycol.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, the components are mixed according to the mass fraction as follows: 25% of 2-amino-2-methyl-propanol, 10% of silicone polyether, 10% of carbonate coupling agent, 10% of diethylene glycol, 30% of glycerol and 15% of propylene glycol.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical ball milling or ring roller milling.

Example 5

The invention discloses a fifth implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, triethanolamine, a surfactant, diethylene glycol, glycerol, and propylene glycol.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, the components are mixed according to the mass fraction as follows: 20% of 2-amino-2-methyl-propanol, 5% of triethanolamine, 10% of silicone polyether, 10% of carbonate coupling agent, 10% of diethylene glycol, 25% of glycerol and 20% of propylene glycol.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical ball milling or ring roller milling.

Example 6

The invention discloses a sixth implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, triethanolamine, a surfactant, diethylene glycol, glycerol, and propylene glycol.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, the components are mixed according to the mass fraction as follows: 15% of 2-amino-2-methyl-propanol, 10% of triethanolamine, 10% of silicone polyether, 10% of carbonate coupling agent, 10% of diethylene glycol, 25% of glycerol and 20% of propylene glycol.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical ball milling or ring roller milling.

Example 7

The invention discloses a fifth implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, triethanolamine, surfactant, diethylene glycol, glycerol, propylene glycol, and ethylene glycol.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, the components are mixed according to the mass fraction as follows: 20% of 2-amino-2-methyl-propanol, 5% of triethanolamine, 10% of silicone polyether, 10% of carbonate coupling agent, 10% of diethylene glycol, 15% of glycerol, 20% of propylene glycol and 5% of ethylene glycol.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical ball milling or ring roller milling.

Example 8

The invention discloses an eighth implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, triethanolamine, surfactant, diethylene glycol, glycerol, propylene glycol, and ethylene glycol.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, the components are mixed according to the mass fraction as follows: 20% of 2-amino-2-methyl-propanol, 5% of triethanolamine, 10% of silicone polyether, 10% of carbonate coupling agent, 10% of diethylene glycol, 25% of glycerol, 10% of propylene glycol and 10% of ethylene glycol.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical ball milling or ring roller milling.

Example 9

The invention discloses a ninth implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, triethanolamine, a surfactant, diethylene glycol, glycerol, propylene glycol, and deionized water.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, deionized water is added on the basis of the mixture ratio of the embodiment 5, and the components are mixed according to the mass fraction as follows:

17% of 2-amino-2-methyl-propanol, 4.25% of triethanolamine, 8.5% of silicone polyether, 8.5% of carbonate coupling agent, 8.5% of diethylene glycol, 21.25% of glycerol, 17% of propylene glycol and 15% of deionized water.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical grinding.

Example 10

The invention discloses a tenth implementation mode of a calcium carbonate grinding aid, which adopts the technical scheme that the calcium carbonate grinding aid comprises the following components:

2-amino-2-methyl-propanol, triethanolamine, a surfactant, diethylene glycol, glycerol, propylene glycol, ethylene glycol, and deionized water.

As a preferable technical scheme of the invention, the surfactant adopts organosilicon polyether and titanate coupling agent.

As a preferred technical scheme of the invention, deionized water is added on the basis of the mixture ratio of the embodiment 8, and the components are mixed according to the mass fraction as follows:

18.5% of 2-amino-2-methyl-propanol, 4.625% of triethanolamine, 9.25% of silicone polyether,

9.25% of carbonate coupling agent, 9.25% of diethylene glycol, 23.125% of glycerol, 9.25% of propylene glycol, 9.25% of ethylene glycol and 7.5% of deionized water.

The calcium carbonate grinding aid prepared according to the proportion can be used for vertical grinding.

The calcium carbonate grinding aids used in examples 1-8 were tested at different ratios and, with comparative experiments, the results were as follows:

from the test results, the particle size of the calcium carbonate is obviously reduced and the fluidity of the calcium carbonate is obviously improved along with the increase of the using amount of the 2-amino-2-methyl-propanol, but the using amount of the 2-amino-2-methyl-propanol is too high, so that the fineness of the particle size of the calcium carbonate and the fluidity of the calcium carbonate can still be ensured after the triethanolamine is used for partially replacing the 2-amino-2-methyl-propanol; with the increase of the dosage of the polyether organic silicon and the titanate coupling agent, the oil absorption value of the calcium carbonate is obviously reduced; with the increase of the amount of the glycerol, although the high temperature resistance of the calcium carbonate grinding aid is obviously improved, in the actual test process, when the amount of the glycerol exceeds 25%, the hygroscopicity of the calcium carbonate is increased, and the calcium carbonate is inconvenient to store.

The surfactant of the calcium carbonate grinding aid can be used for grinding of silicon-containing inorganic pigments such as kaolin, silicon dioxide and the like after a carbonate coupling agent is replaced by a silane coupling agent.

Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes and modifications without inventive changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.