CN105001679A

CN105001679A - Composite titanium dioxide

Info

Publication number: CN105001679A
Application number: CN201410699368.1A
Authority: CN
Inventors: 张津瑞; 张俭
Original assignee: Co Ltd Of Anhui Chizhou City Bo Yuan Nonmetalliferous Ore Research And Development Centre
Current assignee: Co Ltd Of Anhui Chizhou City Bo Yuan Nonmetalliferous Ore Research And Development Centre
Priority date: 2014-11-26
Filing date: 2014-11-26
Publication date: 2015-10-28

Abstract

The invention discloses composite titanium dioxide. The composite titanium dioxide is composed of the following ingredients, by weight, 15-45 parts of titanium dioxide, 50-80 parts of calcined kaolin and 1-3 parts of a silane coupling agent. The composite titanium dioxide is prepared by the following steps: grinding, beating and modifying calcined kaolin, mixing the processed calcined kaolin with titanium dioxide, washing, drying and treating by strong magnetization so as to obtain a finished product. The production technology is simple, and energy consumption is low. By adding a hyper-dispersant during the wet ball-milling process, the powder agglomeration phenomenon which influences whiteness and covering power of the finished product and leads to poor properties of the product can be prevented.

Description

A kind of composite titanium dioxide

Technical field

The present invention relates to a kind of preparation method of titanium dioxide, particularly relate to a kind of composite titanium dioxide.

Background technology

Titanium dioxide take crystalline titania as main component, crystalline titania makes titanium dioxide have the strongest covering power far above the specific refractory power of other inorganics thus becomes best white pigment, but the resource consumption of titanium dioxide is too much, cost is excessive, many producers are had to adopt titanium dioxide substitute and titanium dioxide to be prepared into composite titanium dioxide at present, in order to ensure composite granule, here titanium dioxide substitute refers to the performance with titanium dioxide and cost is lower than titanium dioxide, partly or entirely can substitute the inorganic powder material that titanium dioxide is employed, because pursuit low cost and the large one's duty of efficiency are all adopt dry process on current upper market, but although dry process is simple, but covered effect is undesirable, whiteness is not high enough, opacifying power is inadequate, adopt wet ball grinding technique may occur anti-crushing phenomenon, cause powder reuniting phenomenon, finally cause whiteness not high enough, opacifying power is inadequate.

Summary of the invention

Technical problem to be solved by this invention is: provide a kind of composite titanium dioxide, and described composite titanium dioxide adopts wet ball grinding technique to obtain, and there will not be powder reuniting phenomenon, has the performances such as whiteness is higher, strong covering power.

In order to solve the problem, technical scheme of the present invention is a kind of composite titanium dioxide, and described composite titanium dioxide is made up of following parts by weight ingredient: 15 ~ 45 parts of titanium dioxides, 50 ~ 80 parts of calcined kaolins, 1 ~ 3 part of silane coupling agent.

A preparation method for composite titanium dioxide, its preparation process is as follows:

1) calcined kaolin is ground, after grinding, carry out mashing step process, obtain the slurries that concentration is 20-30%;

2) by silane coupling agent and step 1) in slurries mix;

3) by step 2) in the mixed solution that obtains carry out washing, filter, drying step, obtain modified calcined kaolin powder;

4) mixed with titanium dioxide by modified calcined kaolin powder, make solution, strength of solution is 15 ~ 20%;

5) to step 4) in mixed solution carry out wet ball grinding art breading, and add hyper-dispersant in mechanical milling process, the amount of hyper-dispersant is step 4) in Solute mass 0.8%;

6) mixed solution after wet ball grinding technique is washed, drying step process.

Further, the calcining temperature of described calcined kaolin is 750 ~ 950 DEG C.

Further, described step 5) in hyper-dispersant be polyester type ultra-dispersant agent.

Further, described step 5) in time of wet ball grinding technique be 2 ~ 4h, ball milling speed is 130r/mi n.

Further, described step 6) in washing step by solution washing in neutral.

Further, described step 6) in be also provided with strong magnetic sieve treatment step after drying step, dried powder is sent into process in strong magnetic sieve.

Beneficial effect of the present invention: production technique is simple, and energy consumption is low, adds hyper-dispersant in wet ball grinding process, prevents powder from occurring agglomeration, affects whiteness and the opacifying power of last product, causes the poor performance of product.

Accompanying drawing explanation

Fig. 1 is present invention process schema.

Embodiment

A kind of composite titanium dioxide, described composite titanium dioxide is made up of following parts by weight ingredient: 15 ~ 45 parts of titanium dioxides, 50 ~ 80 parts of calcined kaolins, 1 ~ 3 part of silane coupling agent; Its preparation process is as follows:

2) by sulfurous acid and step 1) in slurries mix;

4) mixed with titanium dioxide by modified calcined kaolin powder, make solution, strength of solution is 15%;

5) to step 4) in mixed solution carry out wet ball grinding art breading, and add polyester type ultra-dispersant agent in mechanical milling process, the amount of polyester type ultra-dispersant agent is step 4) in Solute mass 0.8%;

In order to ensure kaolinic whiteness, be all generally that calcined kaolin calcining temperature is controlled at 850 DEG C; Step 5) in time of wet ball grinding technique be 3h, unsuitable long, ball milling speed is 130r/min, is added with polyester type ultra-dispersant agent in wet grinding process simultaneously; Simultaneously step 6) in washing step can, by solution washing to neutral solution, prevent solution from impacting subsequent reactions; In order to prevent occurring agglomeration in wet grinding process; In step 6) in be also provided with strong magnetic sieve treatment step after drying step, dried powder is sent into process in strong magnetic sieve, the element such as calcium, magnesium in removing powder, adds its whiteness.

Embodiment 1

The integral part of composite titanium dioxide selects titanium dioxide, the kaolin of 150g, the polyester type ultra-dispersant agent of 1.6g, the 3g silane coupling agent of 50g.(test-results is in table 1)

Embodiment 2

The integral part of composite titanium dioxide selects titanium dioxide, the kaolin of 250g, the polyester type ultra-dispersant agent of 2.6g, the 6g silane coupling agent of 70g.(test-results is in table 1)

Embodiment 3

The integral part of composite titanium dioxide selects titanium dioxide, the kaolin of 300g, the polyester type ultra-dispersant agent of 3.3g, the 9g silane coupling agent of 100g.(test-results is in table 1)

Above-described embodiment is carried out to the performance test results of each composite titanium dioxide sample, compares, in table 1 with ordinary titanium powder performance test simultaneously:

Table 1

	Embodiment 1	Embodiment 2	Embodiment 3	Ordinary titanium powder
					Whiteness	91	92	90.5	97.4
Opacifying power (g/m ²)	25	26	24	23
					Density (g/m ³)	3.2	3.4	4.1	4

Above several embodiments of the present invention have been described in detail, but described content being only the preferred embodiment of the invention, the practical range for limiting the invention can not being considered to.All equalizations done according to the invention application range change and improve, and still all should belong to patent covering scope of the present invention.

Claims

1. a composite titanium dioxide, is characterized in that, described composite titanium dioxide is made up of following parts by weight ingredient: 15 ~ 45 parts of titanium dioxides, 50 ~ 80 parts of calcined kaolins, 1 ~ 3 part of silane coupling agent.

2. a preparation method for composite titanium dioxide, is characterized in that, its preparation process is as follows:

2) by silane coupling agent and step 1) in slurries mix;

4) mixed with titanium dioxide by modified calcined kaolin powder, make solution, strength of solution is 15-20%;

5) to step 4) in mixed solution carry out wet ball grinding art breading, and add hyper-dispersant in mechanical milling process, the amount of hyper-dispersant is step 4) in solute 0.8%;

3. the preparation method of composite titanium dioxide according to claim 2, is characterized in that, the calcining temperature of described calcined kaolin is 750 ~ 950 DEG C.

4. the preparation method of composite titanium dioxide according to claim 3, is characterized in that, described step 5) in hyper-dispersant be polyester type ultra-dispersant agent.

5. the preparation method of composite titanium dioxide according to claim 4, is characterized in that, described step 5) in time of wet ball grinding technique be 2 ~ 4h, ball milling speed is 130r/mi n.

6. the preparation method of composite titanium dioxide according to claim 5, is characterized in that, described step 6) in washing step by solution washing in neutral.

7. the preparation method of composite titanium dioxide according to claim 3, is characterized in that, described step 6) in be also provided with strong magnetic sieve treatment step after drying step, dried powder is sent into process in strong magnetic sieve.