CN1297612C - Method for dispersion of inorganic pigment with high-temperature stability in oily medium - Google Patents

Abstract

The present invention relates to a method for dispersing inorganic pigment with high-temperature stability in an oiliness medium, which belongs to the technical field of surface treatment. Slurry materials are washed by water for 1 to 3 times so as to remove saline matters, and the slurry materials are dispersed in water for 5 to 20 minutes, wherein the temperature is raised by 40 to 90 DEG C, and the pH value is adjusted from 5 to 9; subsequently, a surface treating agent is added, and the pH is adjusted to 6 to 7 after the slurry materials are emulsified for 10 to 30 minutes at high speed; finally, the slurry materials are cooled, placed statically, filtered, washed, dried and crushed to obtain a finished product. Alternatively, the slurry materials are washed by the water for 1 to 3 times, excess electrolyte is removed, the slurry materials are dispersed in water for 5 to 20 minutes, wherein the temperature is raised by 40 to 90 DEG C, and the pH value is adjusted from 6 to 7; subsequently, the surface treating agent is added, and the slurry materials are placed statically, cooled and filtered after being emulsified for 10 to 30 minutes at high speed; finally, 0.2 to 8% of fog drops of the surface treating agent is added to the slurry materials in the processes of drying and crushing, and then the finished product is obtained by drying and crushing the slurry materials. The method improves the performance of sulfuration resistance, UV resistance and high-temperature resistance of the pigment, and particularly improves the performance of oil solubility and uniform stability of the pigment in the usage process. Thus, the method is applicable to the application fields of high-grade coatings, plastics, etc.

Description

Dispersion method of inorganic pigment with high temperature stability in oily medium

technical field

The invention relates to a method for dispersing a pigment in an oily medium, in particular to a method for dispersing an inorganic pigment with high temperature stability in an oily medium. It belongs to the technical field of surface treatment.

Background technique

Inorganic pigments have the characteristics of bright color and strong hiding power, and are widely used in paint, ink, plastic and other industries. The effective dosage, uniformity and consistency of the pigment in the medium directly affect its color, transparency, brightness, thermal stability and other properties. With the optimization of the production process of paint, ink, plastics and other industries and the high requirements of application quality, the performance requirements of pigments, especially the dispersion and mutual solubility stability, are getting higher and higher. Due to the strong hydrophilicity of the surface of inorganic pigments, the miscibility in oily media such as paints, inks, plastics, and coatings decreases, so it is difficult to obtain good dispersion during use, and the stability is not good. It greatly limits its service life and scope of use, especially limits the use of pigments outdoors.

After searching the literature of the prior art, it is found that the Chinese patent publication number is CN1171419A, which discloses an inorganic oxide coating treatment method for improving the properties of chromium pigments such as acid and alkali resistance, heat resistance, and vulcanization resistance. The process is: add aluminum, boron, manganese, titanium, antimony compounds to the pigment slurry as surface treatment agents, accounting for about 3-12% of the total, and use silicon compounds, hydrated metal oxides and strong acids as coating aids , the dosage is 12-28%, the temperature is above 85°C, the pressure is 20-80Mpa, and the pH is 9-13, and the coating treatment is carried out in a high-energy, high-pressure device for 1-10h. However, the pigments treated with this process have a large oil absorption capacity and poor mutual solubility.

Contents of the invention

Aiming at the deficiencies and defects of the prior art, the present invention provides a method for dispersing an inorganic pigment with high temperature stability in an oily medium, which improves the vulcanization resistance, UV resistance, and high heat resistance of the pigment, especially improves the pigment's Oil solubility and uniform stability during use, suitable for medium and high-grade coatings, plastics and other application fields.

The present invention is achieved through the following technical solutions, including two methods, specifically as follows:

Wet method: the slurry material is washed 1-3 times with water to remove salt, the ratio of material to water is 1:1-10, dispersed in water for 5-20min, the temperature is raised to 40-90°C, the pH value is 5-9, and the surface treatment agent is added. The dosage of the surface treatment agent is 0.2-10%. After high-speed emulsification for 10-30 minutes, adjust the pH to 6-7, cool down and let stand, filter, wash, dry and pulverize to obtain the finished product.

Mixing method: the slurry material is washed 1-3 times with water to remove excess electrolyte, the ratio of material to water is 1:1-10, dispersed in water for 5-20min, the temperature is raised to 40-90°C, the pH value is about 6-7, and surface treatment is added The amount of surface treatment agent is 0.2-8%. After high-speed emulsification for 10-30 minutes, cool down and stand still, filter, and blow in 0.2-8% of surface treatment agent droplets during the drying and crushing process, or add in the grinding and crushing process Surface treatment agent 0.2-8%, grind for 20-120min, dry and pulverize to get the finished product.

The surface treatment agent includes a variety of nonionic surfactants and anionic surfactants, such as polyethers, ester ethers, phosphate ethers, sulfate ethers, polyol esters, modified silicone oils, etc., with a molecular weight of 200-20000 . The use of surface treatment agents can be selected according to the needs of different products, and one or more combinations can be selected, and the ratio is not limited.

The production process of the present invention includes conventional processes such as batching, emulsification coating, filtration, washing, drying, crushing, and packaging. If the value is 5-9, add a surface treatment agent and emulsify at a high speed for 10-30 minutes to form a dense organic coating film on the surface of the pigment to change the balance of hydrophilic and oleophobic on the surface of the pigment.

The method of the present invention directly uses inorganic pigments such as lead chrome yellow as raw materials, adopts multiple mixed surface treatment agents, the process is simple and economical, and the indicators of the processed lead chrome yellow pigment all reach higher numerical values. The main technical indicators are compared in the following table: sample Color (compared with standard sample) Oil absorption (g/100g) Thermal stability (baking at 180°C for 30min) Miscibility (varnish medium) Dispersion (varnish medium) before processing approximate 22-34 discoloration two day stratification poor, uneven after treatment standard 12-18 Little or no color change Three months without delamination good

According to the polarity of the pigment surface and the medium used, the present invention selects the types and molecular weights of surface treatment agents with different hydrophilic-lipophilic balance values (HLB), and forms a dense surface coating film after high-energy emulsification coating treatment to obtain color and luster. Vibrant, good hiding power, strong tinting power and high thermal stability pigments, which greatly improves the mutual solubility and stability of pigments in oily medium. The process is simple, the operation is convenient, no new equipment is needed, it is economical and environmentally friendly, and it broadens the application field. It is especially suitable for the use of medium and high-grade coatings for automobiles, and has good market demand and application prospects.

Detailed ways

Provide following embodiment in conjunction with content of the present invention:

Example 1

Under the condition of stirring, put 1000Kg of chrome red pigment (1000Kg of chrome red or semi-finished slurry) into the reaction kettle, wash 3 times with water, stir at high speed for 20nin, the proportioning ratio is 1:10, the temperature rises to 85±5°C, and the pH value is about 9. Add 100Kg of polyether (molecular weight about 16000-20000) surfactant, emulsify at high speed for 30 minutes, cool down and let stand, filter, wash, dry and pulverize to get the finished product. The prepared chrome red pigment has bright color and good dispersion effect in ink.

Example 2

Under the condition of stirring, put 1000Kg of chrome red pigment (1000Kg of chrome red or semi-finished slurry) into the reaction kettle, wash once with water, stir at high speed for 5min, the ratio of ingredients is 1:1, the temperature rises to 45±5°C, and the pH value is about 5. Add 2Kg of polyether/ester ether/sulfate ether surfactant (molecular weight between 200-800), high-speed emulsification for 10 minutes, cool down and let stand, filter, wash, dry, and pulverize to obtain the finished product. The prepared chrome red pigment has good light fastness and dispersibility in paint.

Example 3

Under the condition of stirring, put 1000Kg of chrome red pigment (1000Kg of chrome red or semi-finished slurry) into the reaction kettle, wash it twice with water, stir at high speed for 10min, the proportion of ingredients is 1:5, the temperature rises to 65±5°C, and the pH value is about 7. Add 50Kg of polyether/sulfate ether surfactant (molecular weight about 8000-12000), emulsify at high speed for 20 minutes, cool down and let stand, filter, wash, dry and pulverize to get the finished product. The prepared chrome red pigment has bright color, loose particles and good dispersion effect in ink.

Example 4

Under the condition of stirring, put 1000Kg of lead chrome yellow coating pigment (or 1000Kg of lead chrome yellow coating semi-finished product slurry) into the reaction kettle, wash once with water, stir at high speed for 5min, the proportion of ingredients is 1:1, and the temperature rises to 45±5℃ , the pH value is about 5, add 2Kg of modified silicone oil surfactant (molecular weight about 200-400), emulsify at high speed for 10 minutes, let it cool down, filter, wash, dry, and blow in polyether/modified silicone oil nonionic surfactant (Molecular weight about 200-400) mist drop 2Kg, continue to dry, and get the finished product after crushing. The prepared chrome red pigment has bright color, good thermal stability and good dispersion effect in plastics.

Example 5

Under the condition of stirring, put 1000Kg of lead chrome yellow coated pigment (or 1000Kg of lead chrome yellow coated semi-finished product slurry) into the reaction kettle, wash 3 times with water, stir at high speed for 20min, the ratio of ingredients is 1:10, and the temperature rises to 85±5℃ , pH value is about 9, add polyether/ester ether/sulfate ether surfactant (molecular weight about 16000-20000) 80Kg, after high-speed emulsification for 30min, cool down and stand, filter, wash, pre-dry, add multi-component Alcohol ester/modified silicone oil nonionic surfactant (molecular weight about 16000-20000) 80Kg, grind for 120min, dry and pulverize to get the finished product. The prepared lead chrome yellow pigment has bright color, good thermal stability and good dispersion effect in paint.

Example 6

Under the condition of stirring, put 1000Kg of lead chrome yellow coated pigment (or 1000Kg of lead chrome yellow coated semi-finished product slurry) into the reaction kettle, wash twice with water, stir at high speed for 10min, the proportion of ingredients is 1:5, and the temperature rises to 65±5℃ , the pH value is about 7, add polyether/ester ether/sulfate ether surfactant (molecular weight about 8000-12000) 40Kg, emulsify at high speed for 30min, cool down and stand, filter, wash, pre-dry, add multi-component Alcohol ester/modified silicone oil nonionic surfactant (molecular weight about 8000-12000) 40Kg, grind for 70min, dry and pulverize to obtain the finished product. The prepared lead chrome yellow pigment has bright color, good thermal stability and good dispersion effect in paint.

Claims (8)

1, a kind of dispersing method of mineral dye in oil medium with high-temperature stability, it is characterized in that salinity is removed in slurry material washing 1-3 time, disperse 5-20min in the water, intensification 40-90 ℃, pH value 5-9 adds surface treatment agent, the surface treatment agent consumption is 0.2-10%, behind the emulsify at a high speed 10-30min, regulate pH to 6-7, cooling leaves standstill, filters, washs, dry, pulverize and get product.

2, the dispersing method of mineral dye in oil medium with high-temperature stability according to claim 1 is characterized in that, described slurry material washing, and material and water proportioning are 1: 1-10.

3, the dispersing method of mineral dye in oil medium with high-temperature stability according to claim 1, it is characterized in that, described surface treatment agent, for: polyethers, ester ether, phosphoric acid ester ether, one or more combinations in sulfuric ester ether, polyol ester, the modified silicon oil.

4, according to claim 1 or the 3 described dispersing method of mineral dye in oil medium, it is characterized in that described surface treatment agent, molecular weight are 200-20000 with high-temperature stability.

5, a kind of dispersing method of mineral dye in oil medium with high-temperature stability, it is characterized in that, slurry material washing 1-3 time, remove excessive ionogen, disperse 5-20min in the water, intensification 40-90 ℃, pH value 6-7 adds surface treatment agent, and the surface treatment agent consumption is 0.2-8%, behind the emulsify at a high speed 10-30min, cooling is left standstill, is filtered, and is blown into surface treatment agent droplet 0.2-8% in the oven dry crushing process, or adds surface treatment agent 0.2-8% in grinding operation, grind 20-120min, dry, pulverize finished product.

6, the dispersing method of mineral dye in oil medium with high-temperature stability according to claim 5 is characterized in that, described slurry material washing, and material and water proportioning are 1: 1-10.

7, the dispersing method of mineral dye in oil medium with high-temperature stability according to claim 5, it is characterized in that, described surface treatment agent, for: polyethers, ester ether, phosphoric acid ester ether, one or more combinations in sulfuric ester ether, polyol ester, the modified silicon oil.

8, according to claim 5 or the 7 described dispersing method of mineral dye in oil medium, it is characterized in that described surface treatment agent, molecular weight are 200-20000 with high-temperature stability.