| 钛白粉主要特性 |
| 添加时间：2020/8/28 17:00:44 浏览次数： |
| 物理 Physics 1）相对密度 1) Relative density 在常用的白色颜料中，二氧化钛的相对密度最小，同等质量的白色颜料中，二氧化钛的表面积最大，颜料体积最高。[2] Among the common white pigments, the relative density of titanium dioxide is the smallest. Among the white pigments of the same quality, the surface area of titanium dioxide is the largest and the pigment volume is the highest. [2] 2）熔点和沸点 2) Melting point and boiling point 由于锐钛型在高温下会转变成金红石型，因此锐钛型二氧化钛的熔点和沸点实际上是不存在的。只有金红石型二氧化钛有熔点和沸点，金红石型二氧化钛的熔点为1850℃、空气中的熔点为(1830±15)℃、富氧中的熔点为1879℃，熔点与二氧化钛的纯度有关。金红石型二氧化钛的沸点为为(3200±300)℃，在此高温下二氧化钛稍有挥发性。[2] Because anatase transforms into rutile at high temperature, the melting point and boiling point of anatase titanium dioxide are virtually nonexistent. Only rutile type titanium dioxide has melting point and boiling point. The melting point of rutile titanium dioxide is 1850 ℃, the melting point in air is (1830 ± 15) ℃, and the melting point in oxygen enriched titanium dioxide is 1879 ℃. The melting point is related to the purity of titanium dioxide. The boiling point of rutile titanium dioxide is (3200 ± 300) ℃, and the titanium dioxide is slightly volatile at this high temperature. [2] 3）介电常数 3) Dielectric constant 由于二氧化钛的介电常数较高，因此具有优良的电学性能。在测定二氧化钛的某些物理性质时，要考虑二氧化钛晶体的结晶方向。锐钛型二氧化钛的介电常数比较低，只有48。[2] Because of its high dielectric constant, titanium dioxide has excellent electrical properties. When determining some physical properties of titanium dioxide, the crystal direction of titanium dioxide should be considered. The dielectric constant of anatase titanium dioxide is relatively low, only 48. [2] 4）电导率 4) Conductivity 二氧化钛具有半导体的性能，它的电导率随温度的上升而迅速增加，而且对缺氧也非常敏感。金红石型二氧化钛的介电常数和半导体性质对电子工业非常重要，可利用该性质生产陶瓷电容器等电子元器件。[2] Titanium dioxide has the properties of semiconductor, its conductivity increases rapidly with the rise of temperature, and it is also very sensitive to hypoxia. The dielectric constant and semiconductor properties of rutile titanium dioxide are very important to the electronic industry, which can be used to produce ceramic capacitors and other electronic components. [2] 5）硬度 5) Hardness 按莫氏硬度十分制标度，金红石型二氧化钛为6～6.5，锐钛型二氧化钛为5.5～6.0，因此在化纤消光中为避免磨损喷丝孔而采用锐钛型。 According to Mohs hardness scale, rutile titanium dioxide is 6-6.5, anatase titanium dioxide is 5.5-6.0, so anatase is used in chemical fiber matting to avoid abrasion of spinneret hole. 6）吸湿性 6) Hygroscopicity 二氧化钛虽有亲水性，但其吸湿性不太强，金红石型较锐钛型为小。二氧化钛的吸湿性与其表面积的大小有一定关系，表面积大，吸湿性高，还与表面处理与性质有关。 Although titanium dioxide has hydrophilicity, its hygroscopicity is not very strong, rutile type is smaller than anatase type. The hygroscopicity of titanium dioxide is related to its surface area. The surface area is large and the hygroscopicity is high. It is also related to the surface treatment and properties. 7）热稳定性 7) Thermal stability 二氧化钛属于热稳定性好的物质。 Titanium dioxide is a kind of material with good thermal stability. 8) 粒度 8) Particle size 钛白粉粒度分布是一个综合性的指标，它严重影响钛白粉颜料性能和产品应用性能，因此，对于遮盖力和分散性的讨论可直接从粒度分布上进行分析。 The particle size distribution of titanium dioxide is a comprehensive index, which seriously affects the performance of titanium dioxide pigment and product application performance. Therefore, the discussion of covering power and dispersibility can be directly analyzed from the particle size distribution. 影响钛白粉粒度分布的因素较为复杂，首先是水解原始粒径的大小，通过控制和调节水解工艺条件，使原始粒径在一定范围内。其次是煅烧温度，偏钛酸在煅烧的过程中，粒子经历一个晶型转化期和成长期，控制适宜的温度，使成长粒子在一定范围内。最后就是产品的粉碎，通常对雷蒙磨的改造和分析器转速的调节，控制粉碎质量，同时可以采用其它粉碎设备，例如：万能磨、气流粉碎机和锤磨装置。 The factors affecting the particle size distribution of titanium dioxide are complex. The first is the size of the original particle of hydrolysis. By controlling and adjusting the hydrolysis process conditions, the original particle size can be in a certain range. The second is the calcination temperature. In the process of calcining metatitanic acid, the particles undergo a phase of crystal transformation and growth. The appropriate temperature is controlled to make the growth particles in a certain range. The last is the comminution of the product. Usually, the improvement of the Raymond mill and the adjustment of the rotation speed of the analyzer are used to control the grinding quality. At the same time, other crushing equipment can be used, such as universal mill, air grinder and hammer mill. |
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