CN115895296A - Organic coated titanium dioxide and preparation method and application thereof - Google Patents
Organic coated titanium dioxide and preparation method and application thereof Download PDFInfo
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- CN115895296A CN115895296A CN202211479647.8A CN202211479647A CN115895296A CN 115895296 A CN115895296 A CN 115895296A CN 202211479647 A CN202211479647 A CN 202211479647A CN 115895296 A CN115895296 A CN 115895296A
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Abstract
The invention discloses organic coated titanium dioxide and a preparation method and application thereof. The preparation method of the organic coated titanium dioxide comprises the following steps: adding the polysiloxane into the titanium dioxide in a stirring state in a spraying mode, and continuing stirring after the addition is finished to obtain the organic coated titanium dioxide. The organic coated titanium dioxide does not cause polycarbonate degradation, has good compatibility with polycarbonate, is beneficial to improving the mechanical property of the prepared polycarbonate composite material, has simple preparation process, no secondary pollution and low production cost, and is suitable for large-scale production and application.
Description
Technical Field
The invention relates to the technical field of inorganic pigments, in particular to organic coated titanium dioxide and a preparation method and application thereof.
Background
Polycarbonate (PC) is colorless, tasteless, nontoxic and excellent in comprehensive performance, is one of five engineering plastics, has outstanding impact resistance and creep resistance, higher tensile strength, stronger heat resistance and cold resistance, excellent dielectric property, good color and size stability, excellent light transmittance and the like, and is widely applied to the fields of building materials, automobiles, electronics and electrics, food packaging, medical care and the like.
Titanium dioxide is a white pigment with excellent performance, the main component is titanium dioxide, and the titanium dioxide is widely applied to the fields of coatings, printing ink, papermaking, plastic rubber, chemical fibers, ceramics and the like. However, when the titanium dioxide produced by the existing process is used for PC, the problem of PC degradation is easily caused, and the titanium dioxide and the PC have poor compatibility and are easy to phase separate, so that the mechanical property of the prepared polycarbonate composite material is influenced.
Therefore, the development of the titanium dioxide which does not cause polycarbonate degradation and has good compatibility with polycarbonate is of great significance.
The above statements are merely provided to provide background information related to the present disclosure and may not necessarily constitute prior art.
Disclosure of Invention
The invention aims to solve the defects of the existing titanium dioxide and provide the organic coated titanium dioxide which can not cause the degradation of polycarbonate and has good compatibility with the polycarbonate.
The second purpose of the invention is to provide a preparation method of the organic coated titanium dioxide, which has the advantages of simple operation, no secondary pollution and low production cost.
The invention also aims to provide application of the organic coated titanium dioxide.
The technical scheme adopted by the invention is as follows:
the preparation method of the organic coated titanium dioxide comprises the following steps: adding the polysiloxane into the titanium dioxide in a stirring state in a spraying mode, and continuing stirring after adding to obtain the organic coated titanium dioxide.
Preferably, the addition amount of the polyorganosiloxane is 0.05-20% of the mass of the titanium dioxide.
Further preferably, the addition amount of the polyorganosiloxane is 0.1-10% of the mass of the titanium dioxide.
Further preferably, the addition amount of the polysiloxane is 0.5-5% of the mass of the titanium dioxide.
Preferably, the polyorganosiloxane has the following structural formula:
More preferably, the polyorganosiloxane has the following structural formula:
Still more preferably, the polyorganosiloxane is at least one of trimethylsiloxy-terminated Polymethylhydrosiloxane (PMHS), gelest PDS-1615, gelest DMS-S15, gelest HMS-HM271 and Gelest PMS-H11.
Preferably, the titanium dioxide is at least one of sulfuric acid process rutile type titanium dioxide and chloride process rutile type titanium dioxide.
Preferably, the polyorganosiloxane is added in the form of a spray within 5min to 10 min.
Preferably, the time for continuing stirring is 15min to 60min.
Further preferably, the time for continuing the stirring is 20min to 45min.
An organic coated titanium dioxide which is prepared by the preparation method.
The polycarbonate composite material comprises the organic coated titanium dioxide.
Preferably, the matrix resin in the polycarbonate composite material is polycarbonate or a mixture of polycarbonate and at least one of acrylonitrile-butadiene-styrene copolymer (ABS) and polybutylene terephthalate (PBT).
The invention has the beneficial effects that: the organic coated titanium dioxide does not cause polycarbonate degradation, has good compatibility with polycarbonate, is beneficial to improving the mechanical property of the prepared polycarbonate composite material, has simple preparation process, no secondary pollution and low production cost, and is suitable for large-scale production and application.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
the preparation method of the organic coated titanium dioxide comprises the following steps:
adding 2kg of chloridized rutile type titanium dioxide (TIONA-188 of Coster), drying for 2h at 120 ℃, naturally cooling, transferring to a horizontal mixer, starting stirring, adding 20g of trimethylsiloxy end-capped polymethylhydrosiloxane (the number average molecular weight is about 1500 g/mol) in a spraying manner, finishing adding 7min, and continuing stirring for 30min to obtain the organic coated titanium dioxide.
Example 2:
the preparation method of the organic coated titanium dioxide comprises the following steps:
2kg of chloride process rutile type titanium dioxide (TIONA-188 of Coster) is added into an oven, baked for 2h at 120 ℃, naturally cooled, transferred into a horizontal mixer and stirred, 20g of polyorganosiloxane Gelest PDS-1615,7min is added in a spray form, and stirring is continued for 30min to obtain the organic coated titanium dioxide.
Example 3:
the preparation method of the organic coated titanium dioxide comprises the following steps:
adding 2kg of chloride rutile type titanium dioxide (TIONA-188 of Coster) into an oven, drying for 2h at 120 ℃, naturally cooling, transferring into a horizontal mixer, starting stirring, adding 20g of polyorganosiloxane Gelest DMS-S15 in a spraying manner, finishing adding 7min, and continuing stirring for 30min to obtain the organic coated titanium dioxide.
Example 4:
the preparation method of the organic coated titanium dioxide comprises the following steps:
2kg of chloride process rutile type titanium dioxide (TIONA-188 of Coster) is added into an oven, baked for 2h at 120 ℃, naturally cooled, transferred into a horizontal mixer and stirred, 20g of polyorganosiloxane Gelest HMS-HM271 is added in a spraying manner, the addition is completed within 7min, and the stirring is continued for 30min, so that the organic coated titanium dioxide is obtained.
Example 5:
the preparation method of the organic coated titanium dioxide comprises the following steps:
adding 2kg of chloride rutile type titanium dioxide (TIONA-188 of Coster) into an oven, drying for 2H at 120 ℃, naturally cooling, transferring into a horizontal mixer, starting stirring, adding 20g of polyorganosiloxane Gelest PMS-H11 in a spraying manner, finishing the addition for 7min, and continuing stirring for 30min to obtain the organic coated titanium dioxide.
Comparative example:
chloride rutile titanium dioxide (TIONA-188 from Const).
And (3) performance testing:
the organic-coated titanium dioxide of examples 1 to 5 and the chloride-process rutile titanium dioxide of the comparative example were used as pigments to prepare polycarbonate composites, and then test specimens 1 to 5 and comparative test specimens were prepared, blank test specimens (without titanium dioxide addition) were set, and then performance tests were performed, with the test results shown in the following table:
TABLE 1 polycarbonate composites Performance test results
Note:
the formula of the polycarbonate composite material is as follows (in percentage by mass): polycarbonate (weight average molecular weight 21500 g/mol): 97.94 percent; titanium dioxide: 2 percent; antioxidant 168:0.06 percent.
The molding process of the test sample strip comprises the following steps: adding polycarbonate, titanium dioxide and antioxidant 168 into a double-screw extruder, extruding and granulating at 280 ℃, melting at 315 ℃, and then performing injection molding.
Melt index test conditions: 300 ℃ and a weight of 1.2 kg.
Lightness L and hue b: the test was performed with reference to the CIE94 standard. The smaller the value of b, the better, the closer to the standard value.
Notched impact strength: the test was performed with reference to the ASTM D256 standard.
As can be seen from Table 1: the organic coated titanium dioxide does not cause polycarbonate degradation, has good compatibility with polycarbonate, and is beneficial to improving the mechanical property of polycarbonate products.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A preparation method of organic coated titanium dioxide is characterized by comprising the following steps: adding the polysiloxane into the titanium dioxide in a stirring state in a spraying mode, and continuing stirring after adding to obtain the organic coated titanium dioxide.
2. The method for preparing organic-coated titanium dioxide according to claim 1, wherein the method comprises the following steps: the addition amount of the polyorganosiloxane is 0.05-20% of the mass of the titanium dioxide.
3. The method for preparing organic-coated titanium dioxide according to claim 2, wherein: the addition amount of the polyorganosiloxane is 0.1-10% of the mass of the titanium dioxide.
4. The method for preparing the organic coated titanium dioxide according to any one of claims 1 to 3, wherein the method comprises the following steps: the structural formula of the polyorganosiloxane is shown as follows:
5. The method for preparing organic-coated titanium dioxide according to claim 4, wherein the method comprises the following steps: the structural formula of the polyorganosiloxane is shown as follows:
6. The method for preparing the organic coated titanium dioxide according to any one of claims 1 to 3, wherein the method comprises the following steps: the titanium dioxide is at least one of sulfuric acid method rutile type titanium dioxide and chlorination method rutile type titanium dioxide.
7. The method for preparing the organic coated titanium dioxide according to any one of claims 1 to 3, wherein the method comprises the following steps: the polyorganosiloxane is added in a spray form within 5-10 min.
8. The method for preparing organic-coated titanium dioxide according to any one of claims 1 to 3, wherein: the continuous stirring time is 15 min-60 min.
9. An organic coated titanium dioxide powder, characterized in that it is prepared by the preparation method of any one of claims 1 to 8.
10. A polycarbonate composite characterized by consisting of the organic coated titanium dioxide of claim 9.
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