Titanium dioxide for chinlon chemical fiber and preparation method thereof

Abstract

The invention provides titanium dioxide for chinlon chemical fibers and a preparation method of the titanium dioxide, and relates to the field of high-performance fibers and composite materials. The titanium dioxide for the chinlon chemical fiber comprises a titanium dioxide inner core, a silicon dioxide inner coating layer, an aluminum oxide middle coating layer and a manganese dioxide outer coating layer, the raw material of the titanium dioxide core is anatase titanium dioxide; the raw material of the silicon dioxide inner coating layer is sodium silicate; the raw material of the aluminum oxide intermediate coating layer is sodium metaaluminate; the manganese dioxide outer coating layer is prepared from the following raw materials: manganese sulfate, sodium polyphosphate and sodium hydroxide; in parts by weight, the content of the anatase titanium dioxide is 90 to 100 parts; the content of the sodium silicate is 0.0005 to 0.002 part; the content of the sodium metaaluminate is 0.008 to 0.01 part; according to the titanium dioxide for the chinlon chemical fiber, the anti-aging performance of the titanium dioxide can be improved, water molecule permeation is blocked, and synergistic enhancement of light corrosion resistance and damp-heat aging resistance is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-performance fibers and composite materials, and particularly relates to titanium dioxide for nylon chemical fiber and a preparation method thereof. BACKGROUND

[0002] Nylon is a kind of synthetic fiber, and its chemical composition is polyamide (PA), which is connected by amide bonds (-CO-NH-). It is mainly divided into nylon 6 and nylon 66. Its characteristics are high strength, excellent wear resistance, good elasticity and wrinkle resistance, but it is easy to absorb moisture and has poor light resistance (ultraviolet light can cause yellowing and embrittlement).

[0003] In the field of chemical fiber production, titanium dioxide is widely used due to its excellent light shielding performance and ideal whitening effect. Ordinary anatase titanium dioxide has high photocatalytic activity. When titanium dioxide is added to the fiber, due to the photocatalytic activity of titanium dioxide itself, it acts on the fiber, not only can decompose the dye for fiber dyeing, but also can cause the breakage of polyamide molecular chain, thereby causing the fiber to fade and age, and reducing the mechanical properties of the fiber. In order to improve the light resistance and weather resistance, it is necessary to modify the titanium dioxide, so as to reduce the photochemical activity of titanium dioxide and improve the anti-aging performance of the product.

[0004] Therefore, it is an urgent problem to be solved to provide titanium dioxide for nylon chemical fiber with good anti-aging property and a preparation method thereof. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides titanium dioxide for nylon chemical fiber and a preparation method thereof. The titanium dioxide for nylon chemical fiber comprises a titanium dioxide core, a silicon dioxide inner coating layer, an aluminum oxide intermediate coating layer and a manganese dioxide outer coating layer. The raw material of the titanium dioxide core is anatase titanium dioxide. The raw material of the silicon dioxide inner coating layer is sodium silicate. The raw material of the aluminum oxide intermediate coating layer is sodium aluminate. The raw material of the manganese dioxide outer coating layer is manganese sulfate, sodium polyphosphate and sodium hydroxide. The anatase titanium dioxide is 90-100 parts by weight. The sodium silicate is 0.0005-0.002 parts. The sodium aluminate is 0.008-0.01 parts. The manganese sulfate is 0.0005-0.002 parts, and the sodium polyphosphate is 0.0005-0.0007 parts. The titanium dioxide for nylon chemical fiber can improve the anti-aging performance of titanium dioxide, block the penetration of water molecules, and realize the synergistic enhancement of anti-photo corrosion and anti-hygrothermal aging.

[0006] The purpose of the present application is achieved by the following technical solutions: In a first aspect, the present application provides titanium dioxide for nylon chemical fiber, which comprises a titanium dioxide core, a silicon dioxide inner coating layer, an aluminum oxide intermediate coating layer and a manganese dioxide outer coating layer. The raw material of the titanium dioxide inner core is anatase titanium dioxide; the raw material of the silica inner coating layer is sodium silicate; the raw material of the di-aluminum trioxide intermediate coating layer is sodium meta-aluminate; the raw material of the manganese dioxide outer coating layer is manganese sulfate, sodium polyphosphate and sodium hydroxide; The anatase titanium dioxide is 90-100 parts by weight; the sodium silicate is 0.0005-0.002 parts; the sodium meta-aluminate is 0.008-0.01 parts; the manganese sulfate is 0.0005-0.002 parts, and the sodium polyphosphate is 0.0005-0.0007 parts.

[0007] In some specific embodiments of the present application, the anatase titanium dioxide is 96 parts by weight; the sodium silicate is 0.001 parts; the sodium meta-aluminate is 0.009 parts; the manganese sulfate is 0.001 parts, and the sodium polyphosphate is 0.0006 parts.

[0008] In the second aspect, the present application provides a preparation method of the nylon chemical fiber titanium dioxide powder, which comprises the following steps: S1, dispersing anatase titanium dioxide in deionized water, filtering, grinding, diluting and grading to obtain a titanium dioxide fine particle slurry; S2, heating the titanium dioxide fine particle slurry, adding sodium silicate, stirring for 20-40 minutes; then adding sodium meta-aluminate, stirring for 20-40 minutes; then adding manganese sulfate and sodium polyphosphate, stirring for 20-40 minutes; and then adding sodium hydroxide to control the pH value to obtain a coated slurry; S3, filtering the coated slurry to obtain a filter cake, placing the filter cake in a beating tank, adding a surfactant, and drying and crushing to obtain a nylon chemical fiber titanium dioxide.

[0009] In some specific embodiments of the present application, the pH value in S2 is 9-11; further, the pH value in S2 is 9.5-10.5; and more further, the pH value in S2 is 10.

[0010] In some specific embodiments of the present application, the heating temperature in S2 is 60-80℃; further, the heating temperature is 70℃.

[0011] In some specific embodiments of the present application, the deionized water in S1 is 50-70 parts by weight; and the diluent for dilution is deionized water, and the amount of the diluent is 90-110 parts.

[0012] In some specific embodiments of the present application, the anatase titanium dioxide is 90-100 parts by weight; the sodium silicate is 0.0005-0.002 parts by weight; the sodium metaaluminate is 0.008-0.01 parts by weight; the manganese sulfate is 0.0005-0.002 parts by weight; and the sodium polyphosphate is 0.0005-0.0007 parts by weight.

[0013] In some specific embodiments of the present application, the filtering device in S1 is an oscillating screen, the grinding device is a sand mill, and the classifying device is a horizontal screw discharge centrifugal classifier.

[0014] In some specific embodiments of the present application, the surfactant in S3 is one or more of emulsified silicone oil, trimethylol ethane, trimethylol propane, or monoisopropanolamine.

[0015] In some specific embodiments of the present application, the amount of the surfactant is 0.003-0.005 parts by weight; further, the amount of the surfactant is 0.004 parts by weight.

[0016] The present application has the following beneficial effects: 1. The present application provides titanium dioxide for use in polyamide fiber, which can improve the chemical stability and dispersibility of titanium dioxide, reduce its photocatalytic activity through physical isolation, and enhance weather resistance and ultraviolet resistance, so that the product maintains long-term stable whiteness and light-shielding effect in fiber applications. 2. The present application provides titanium dioxide for use in polyamide fiber, which has strong ultraviolet absorption capacity in the manganese dioxide coating layer, inhibiting the photocatalytic activity of titanium dioxide and improving the anti-aging performance of titanium dioxide; at the same time, the hydrophobic manganese oxide layer can block the penetration of water molecules, achieving synergistic enhancement of anti-photo corrosion and anti-humidity aging, and is particularly suitable for polyamide fiber products that need to be used outdoors for a long time. 3. The present application provides a preparation method of titanium dioxide for use in polyamide fiber, which uses manganese sulfate and sodium polyphosphate as raw materials for the manganese dioxide coating layer, can reduce the cost, and uses sodium hydroxide to control the pH value to form the manganese dioxide coating layer, improving the uniformity and compactness of the manganese dioxide coating layer, and being suitable for industrial production. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 The preparation method of titanium dioxide for use in polyamide fiber is shown in the flowchart. DETAILED DESCRIPTION

[0019] The application will be further described in connection with the following specific examples, which are not intended to limit the application, but merely to illustrate the application. The experimental methods used in the following examples are as follows unless otherwise specified. The experimental methods not specified in the examples are generally carried out under conventional conditions. The materials and reagents used in the following examples are commercially available unless otherwise specified.

[0020] Example 1

[0021] A method for preparing titanium dioxide for use in nylon and chemical fibers, specifically comprising the following steps, as shown in Figure 1 Coarse material treatment of anatase titanium dioxide: 9600 kg of coarse anatase titanium dioxide was dispersed in 6000 kg of deionized water, filtered through a vibrating screen, and then ground twice with a sand mill. The slurry was then transferred to a stirred tank, 10000 kg of deionized water was added to dilute the slurry, and the diluted slurry was continuously fed into a horizontal spiral discharge centrifugal classifier for classification to remove large particles. The fine particle material was fed into a stirred tank for use.

[0022] Silicon dioxide, aluminum oxide, and manganese dioxide coating on the surface of titanium dioxide particles: the slurry was heated to 70℃, and 0.1 kg of sodium silicate was added to the slurry while stirring. The stirring was continued for 30 minutes. Then, 0.9 kg of sodium metaaluminate was added to the slurry while stirring. The stirring was continued for another 30 minutes. Then, 0.1 kg of manganese sulfate and 0.06 kg of sodium polyphosphate were added to the slurry while stirring. The stirring was continued for another 30 minutes. Then, sodium hydroxide was slowly added to the slurry to control the pH value to 10.

[0023] The slurry was filtered in a plate and frame filter press, and the filter cake was placed in a beating tank. 0.4 kg of trimethylol ethane was added to the slurry, and the slurry was dried. The dried material was pulverized with a pulverizer, and then packaged to obtain titanium dioxide for use in nylon and chemical fibers.

[0024] The titanium dioxide for use in nylon and chemical fibers in this example includes an anatase titanium dioxide core, a silicon dioxide inner coating layer, an aluminum oxide intermediate coating layer, and a manganese dioxide outer coating layer.

[0025] Example 2

[0026] A method for preparing titanium dioxide for use in nylon and chemical fibers, specifically comprising the following steps, ​The crude anatase titanium dioxide is 9000 kg, which is dispersed in 5000 kg of deionized water, filtered through a vibrating screen, ground twice with a sand mill, then transferred to a stirred tank, diluted with 9000 kg of deionized water, and continuously fed into a horizontal spiral discharge centrifugal classifier for classification to remove large particles, and the fine particles are fed into a stirred tank for use.

[0027] The surface of the titanium dioxide particles is coated with silicon dioxide, aluminum oxide, and manganese dioxide. The slurry is heated to 60°C, and 0.05 kg of sodium silicate is added while stirring. Stirring continues for 20 minutes. Then, 0.8 kg of sodium metaaluminate is added while stirring. Stirring continues for another 20 minutes. Then, 0.05 kg of manganese sulfate and 0.05 kg of sodium polyphosphate are added while stirring. Stirring continues for another 20 minutes. Finally, sodium hydroxide is slowly added to control the pH value to 9.

[0028] The slurry is filtered in a plate and frame filter press, and the filter cake is placed in a beating tank. 0.3 kg of trimethylolpropane is added to the slurry, which is then dried. The dried material is pulverized with a pulverizer, and then packaged to obtain titanium dioxide for nylon and chemical fibers.

[0029] The titanium dioxide for nylon and chemical fibers in this embodiment includes an anatase titanium dioxide core, a silicon dioxide inner coating layer, an aluminum oxide intermediate coating layer, and a manganese dioxide outer coating layer.

[0030] Example 3

[0031] A method for preparing titanium dioxide for nylon and chemical fibers, specifically including the following steps, The crude anatase titanium dioxide is 11000 kg, which is dispersed in 7000 kg of deionized water, filtered through a vibrating screen, ground twice with a sand mill, then transferred to a stirred tank, diluted with 11000 kg of deionized water, and continuously fed into a horizontal spiral discharge centrifugal classifier for classification to remove large particles, and the fine particles are fed into a stirred tank for use.

[0032] The surface of the titanium dioxide particles is coated with silicon dioxide, aluminum oxide, and manganese dioxide. The slurry is heated to 80°C, and 0.2 kg of sodium silicate is added while stirring. Stirring continues for 40 minutes. Then, 1 kg of sodium metaaluminate is added while stirring. Stirring continues for another 40 minutes. Then, 0.2 kg of manganese sulfate and 0.07 kg of sodium polyphosphate are added while stirring. Stirring continues for another 40 minutes. Finally, sodium hydroxide is slowly added to control the pH value to 11.

[0033] The slurry is sent into a plate-and-frame filter press for filtration, the obtained filter cake is put into a beating-up tank, 0.5 kg of isopropyl alcohol amine is added into the slurry, the slurry is dried, the dried material is crushed by a crusher, and then packaged to obtain the titanium dioxide for nylon chemical fiber.

[0034] The titanium dioxide for nylon chemical fiber in the embodiment includes an anatase titanium dioxide core, a silicon dioxide inner coating layer, an aluminum oxide intermediate coating layer, and a manganese dioxide outer coating layer.

[0035] Example 4

[0036] In order to explore the anti-aging performance of the titanium dioxide for nylon chemical fiber, 100 g of the titanium dioxide sample in Example 1 is placed outdoors for a one-month natural light exposure test.

[0037] The test results show that the color difference of the sample before and after exposure is very small, wherein the lightness L decreases from 98.6 to 98.34, the color a changes from 0.13 to 0.15, the color b changes from 0.22 to 0.26, and the calculated color difference ΔE value is very low. The results show that the sample does not appear yellowing, which reflects excellent anti-aging and optical stability.

[0038] The above detailed description further describes the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the present application should be included in the protection scope of the present application.​

Claims

1. A titanium white pigment for use in nylon synthetic fibers, characterized by comprising: The titanium dioxide for nylon chemical fiber comprises a titanium dioxide core, a silica inner coating layer, an aluminum oxide intermediate coating layer and a manganese dioxide outer coating layer. The raw material of the titanium dioxide core is anatase titanium dioxide; the raw material of the silica inner coating layer is sodium silicate; the raw material of the aluminum oxide intermediate coating layer is sodium aluminate; and the raw material of the manganese dioxide outer coating layer is manganese sulfate, sodium polyphosphate and sodium hydroxide. The anatase titanium dioxide is 90-100 parts by weight; the sodium silicate is 0.0005-0.002 parts by weight; the sodium aluminate is 0.008-0.01 parts by weight; the manganese sulfate is 0.0005-0.002 parts by weight; and the sodium polyphosphate is 0.0005-0.0007 parts by weight.

2. The titanium dioxide for use in polyamide fibers according to claim 1, characterized in that, The anatase titanium dioxide is 96 parts by weight; the sodium silicate is 0.001 parts by weight; the sodium aluminate is 0.009 parts by weight; the manganese sulfate is 0.001 parts by weight; and the sodium polyphosphate is 0.0006 parts by weight.

3. A method for producing titanium white for use in a nylon fiber according to claim 1 or 2, characterized by, The preparation method of the titanium dioxide for nylon chemical fiber comprises the following steps: S1, dispersing anatase titanium dioxide in deionized water, filtering, grinding, diluting and grading to obtain a titanium dioxide fine particle slurry; S2, heating the titanium dioxide fine particle slurry, adding sodium silicate, stirring for 20-40 minutes, then adding sodium aluminate, stirring for 20-40 minutes, then adding manganese sulfate and sodium polyphosphate, stirring for 20-40 minutes, and then adding sodium hydroxide to control the pH value to obtain a coated slurry; S3, filtering the coated slurry to obtain a filter cake, placing the filter cake in a beating tank, adding a surfactant, and then drying and crushing to obtain the titanium dioxide for nylon chemical fiber.

4. The method for preparing titanium dioxide for use in nylon and chemical fiber according to claim 3, characterized in that, The pH value in S2 is 9-11; further, the pH value in S2 is 9.5-10.5; and further, the pH value in S2 is 10.

5. The method for preparing titanium dioxide for nylon chemical fibers according to claim 3, characterized in that, The heating temperature in S2 is 60-80℃; further, the heating temperature is 70℃.

6. The method for preparing titanium dioxide for use in nylon and chemical fiber according to claim 3, characterized in that, The deionized water in S1 is 50-70 parts by weight; the diluent for dilution is deionized water, and the amount of the diluent is 90-110 parts by weight.

7. The method for preparing titanium dioxide for nylon chemical fibers according to claim 3, characterized in that, The anatase titanium dioxide is 90-100 parts by weight; the sodium silicate is 0.0005-0.002 parts by weight; the sodium aluminate is 0.008-0.01 parts by weight; the manganese sulfate is 0.0005-0.002 parts by weight; and the sodium polyphosphate is 0.0005-0.0007 parts by weight.

8. The method for preparing titanium dioxide for use in nylon synthetic fiber according to claim 3, characterized in that, The filtering device in S1 is a vibrating screen, the grinding device is a sand mill, and the grading device is a horizontal screw discharge centrifugal classifier.

9. The method for preparing titanium dioxide for nylon chemical fibers according to claim 3, characterized in that, The surfactant in S3 is one or more of emulsified silicone oil, trimethylol ethane, trimethylol propane or monoisopropanolamine.

10. The method for preparing titanium dioxide for nylon chemical fibers according to claim 3 or 9, characterized in that, The amount of the surfactant is 0.003-0.005 parts by weight; further, the amount of the surfactant is 0.004 parts by weight.

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