CN116041982A - 钛白粉无机包膜方法 - Google Patents
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 59
- 238000000576 coating method Methods 0.000 title claims abstract description 55
- 239000002002 slurry Substances 0.000 claims abstract description 84
- 239000011248 coating agent Substances 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 17
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 17
- 239000011734 sodium Substances 0.000 claims abstract description 17
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 235000010215 titanium dioxide Nutrition 0.000 claims description 62
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000004115 Sodium Silicate Substances 0.000 claims description 19
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 19
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims 7
- 238000001035 drying Methods 0.000 abstract description 5
- 239000004576 sand Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 14
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 238000004381 surface treatment Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000001038 titanium pigment Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3615—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3615—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
- C09C1/3623—Grinding
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
- C09C1/3661—Coating
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- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
- C09C3/063—Coating
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Abstract
本发明公开了钛白粉无机包膜方法,以金红石型二氧化钛初品为原料,加入分散剂砂磨后制备成TiO2浓度为250‑260g/L的浆料,将浆料的温度加热至60~65℃并保持恒温;用pH调节剂调节浆料的pH值为8.0~8.5,熟化20~40min;用pH调节剂调节浆料的pH值为10.0~10.5,熟化20~40min,然后在45~90min内加入偏铝酸钠,同时用pH调节剂维持浆料pH在10.0~10.5,然后熟化45~90min;然后将得到的浆料用pH调节剂调节并保持pH值为7.0~7.5,熟化20~40min,包膜结束。本发明在无机包膜前先将二氧化钛的浆料pH值调整为8.0~8.5熟化20~40min,然后再提高pH值为碱性进行无机包膜,从而提高了无机包膜后钛白粉的流动性,解决了闪干工序浆料流动性差、进料困难的问题,同时提高了运行效率,降低了运行成本。
Description
技术领域
本发明涉及钛白粉生产技术领域,尤其是一种钛白粉无机包膜方法。
背景技术
钛白粉是一种白色无机颜料,具有最佳的不透明性、最佳白度和光亮度和无毒等特性,被公认是目前世界上性能最好的白色颜料,广泛应用于涂料、塑料、造纸、印刷油墨、化纤、橡胶、化妆品等工业。钛白粉生产工艺主要包括硫酸法和氯化法,两种方法生产的金红石型钛白产品均需经过无机表面处理后再进行应用。未经表面处理的钛白粉表面带有许多羟基,极性较大,在有机介质中容易团聚,并产生沉降,其分散性和分散稳定性很差,其次未经表面处理的钛白粉由于本身的晶格缺陷,其耐候性和化学稳定性均较差。无机表面处理的核心是使包膜物质均匀包覆在二氧化钛表面,从而提高钛白粉的耐候性和其它应用性能,钛白粉表面无机包膜的效果直接影响产品的最终应用性能。
目前的包膜采用的方法基本为沉淀法,其基本原理是通过控制体系pH,使包膜剂以一定速率沉淀在二氧化钛颗粒表面,然后包膜后的无机包膜的浆料进行闪干后处理工序得到干燥好的钛白粉。在现有技术中,无机包膜的浆料没有经过有机改性,流动性差,从而导致其在闪干进料过程中呈胶冻状,粘附设备外壁,容易出现堵塞,导致进料困难。目前,为了提高钛白粉的无机包膜效果,大部分公司在氯化法钛白粉无机包膜前,都会选择加入硅酸钠作为分散剂,以促进浆料分散,使得无机包膜更加均匀,避免因为钛白粉颗粒结团而出现包覆不全的问题。但添加硅酸钠作为分散剂,在后面无机包膜过程中,调整pH后,会导致硅酸钠水解,形成硅胶。包覆在钛白粉表面,导致钛白粉呈胶冻装,影响钛白粉闪干进料的流动性,为了解决闪干料流动性的问题,公开号为CN113387383A的中国发明专利申请公开了一种高流动性钛白粉闪干料的生产方法,其增加了处理设备,使得工序变得复杂且无法从根本上解决浆料流动性差的问题。
因此,亟需寻找一种从根本上解决无机包膜后的钛白粉浆料进入闪干设备时流动性差、进料困难的方法。
发明内容
本发明所要解决的技术问题是提供一种钛白粉无机包膜方法,该方法可以防止无机包膜后的钛白粉浆料进入闪干工序时进料困难的问题,从而提高无机包膜后的钛白粉浆料的流动性。
本发明解决其技术问题所采用的技术方案是:钛白粉无机包膜方法,包括以下步骤:
(1)以金红石型二氧化钛初品为原料,加入分散剂砂磨后制备成TiO2浓度为250-260g/L的浆料,将浆料的温度加热至60~65℃并保持恒温;
(2)用pH调节剂调节浆料的pH值为8.0~8.5,熟化20~40min;
(3)用pH调节剂调节浆料的pH值为10.0~10.5,熟化20~40min,然后在45~90min内加入偏铝酸钠,同时用pH调节剂维持浆料pH在10.0~10.5,然后熟化45~90min;所述偏铝酸钠加入量为以Al2O3计为二氧化钛质量的1~3%;
(4)然后将步骤(3)得到的浆料用pH调节剂调节并保持pH值为7.0~7.5,熟化20~40min,包膜结束。
进一步的,步骤(1)所述的分散剂为硅酸钠,浆料中硅酸钠的浓度为180~220g/L。
进一步的,所述的pH调节剂为质量浓度为10%~15%的稀盐酸或氢氧化钠。
进一步的,所述金红石型二氧化钛初品砂磨后平均粒径为0.2~0.3μm。
进一步的,所述步骤(1)中在金红石型二氧化钛初品的原料中加入去离子水,制备成TiO2浓度为250-260g/L的浆料。
进一步的,所述步骤(2)中在5~15min内用pH调节剂调节浆料的pH值为8.0~8.5。
进一步的,所述步骤(3)中在5~15min内用pH调节剂调节浆料的pH值为10.0~10.5。
进一步的,所述步骤(4)中在10~50min内用pH调节剂调节浆料的pH值为7.0~7.5。通过在步骤(2)、(3)、(4)控制pH值的调节时间,让反应生成的固体充分的沉降、致密的包覆在二氧化钛的表面。
本发明的有益效果是:本发明在无机包膜前先将二氧化钛的浆料pH值调整为8.0~8.5熟化20~40min,然后再提高pH值为碱性进行无机包膜,从而提高了无机包膜后钛白粉的流动性,解决了闪干工序浆料流动性差、进料困难的问题,同时提高了运行效率,降低了运行成本。
具体实施方式
下面结合实施例对本发明进一步说明。
实施例1:
一种钛白粉无机包膜方法,包括以下步骤:
(1)在金红石型二氧化钛初品中加入去离子水,加入硅酸钠砂磨后制备成TiO2浓度为250g/L的浆料,浆料中硅酸钠的浓度为180g/L,将浆料的温度加热至60℃并保持恒温,并控制整个包膜过程温度在60℃;
(2)在15min内加入质量浓度为10%的稀盐酸溶液调节浆料的pH值为8.0,熟化30min;
(3)用质量浓度为10%的氢氧化钠溶液在15min内调节浆料的pH值为10.0~10.5,熟化30min,然后在60min内并流加入偏铝酸钠和质量浓度为10%的稀盐酸溶液,维持浆料pH在10.0~10.5,然后熟化60min;所述偏铝酸钠加入量为以Al2O3计为二氧化钛质量的1%;
(4)然后将步骤(3)得到的浆料用质量浓度为10%的稀盐酸溶液在40min内调节并保持pH值为7.0~7.5,熟化30min,包膜结束。
实施例2:
一种钛白粉无机包膜方法,包括以下步骤:
(1)在金红石型二氧化钛初品中加入去离子水,加入硅酸钠砂磨后制备成TiO2浓度为255g/L的浆料,浆料中硅酸钠的浓度为220g/L,将浆料的温度加热至63℃并保持恒温,并控制整个包膜过程温度在63℃;
(2)在15min内加入质量浓度为15%的稀盐酸溶液调节浆料的pH值为8.5,熟化30min;
(3)用质量浓度为15%的氢氧化钠溶液在15min内调节浆料的pH值为10.0~10.5,熟化30min,然后在60min内并流加入偏铝酸钠和质量浓度为15%的稀盐酸溶液,维持浆料pH在10.0~10.5,然后熟化60min;所述偏铝酸钠加入量为以Al2O3计为二氧化钛质量的1%;
(4)然后将步骤(3)得到的浆料用质量浓度为15%的稀盐酸溶液在40min内调节并保持pH值为7.0~7.5,熟化30min,包膜结束。
实施例3:
一种钛白粉无机包膜方法,包括以下步骤:
(1)在金红石型二氧化钛初品中加入去离子水,加入硅酸钠砂磨后制备成TiO2浓度为260g/L的浆料,浆料中硅酸钠的浓度为200g/L,将浆料的温度加热至65℃并保持恒温,并控制整个包膜过程温度在65℃;
(2)在15min内加入质量浓度为12.5%的稀盐酸溶液调节浆料的pH值为8.2,熟化30min;
(3)用质量浓度为12.5%的氢氧化钠溶液在15min内调节浆料的pH值为10.0~10.5,熟化30min,然后在60min内并流加入偏铝酸钠和质量浓度为12.5%的稀盐酸溶液,维持浆料pH在10.0~10.5,然后熟化60min;所述偏铝酸钠加入量为以Al2O3计为二氧化钛质量的1%;
(4)然后将步骤(3)得到的浆料用质量浓度为12.5%的稀盐酸溶液在40min内调节并保持pH值为7.0~7.5,熟化30min,包膜结束。
对比例1:(包膜前没有对浆料在中性条件下熟化,其他同实施例1)
一种钛白粉无机包膜方法,包括以下步骤:
(1)在金红石型二氧化钛初品中加入去离子水,加入硅酸钠砂磨后制备成TiO2浓度为250g/L的浆料,浆料中硅酸钠的浓度为180g/L,将浆料的温度加热至60℃并保持恒温,并控制整个包膜过程温度在60℃;
(2)用质量浓度为10%氢氧化钠溶液在15min内调节浆料的pH值为10.0~10.5,熟化30min,然后在60min内并流加入偏铝酸钠和质量浓度为10%的稀盐酸溶液,维持浆料pH在10.0~10.5,然后熟化60min;所述偏铝酸钠加入量为以Al2O3计为二氧化钛质量的1%;
(3)然后将步骤(2)得到的浆料用质量浓度为10%稀盐酸溶液在40min内调节并保持pH值为7.0~7.5,熟化30min,包膜结束。
对比例2:(包膜前对浆料在酸性条件下熟化,其他同实施例1)
一种钛白粉无机包膜方法,包括以下步骤:
(1)在金红石型二氧化钛初品中加入去离子水,加入硅酸钠砂磨后制备成TiO2浓度为250g/L的浆料,浆料中硅酸钠的浓度为180g/L,将浆料的温度加热至60℃并保持恒温,并控制整个包膜过程温度在60℃;
(2)在15min内加入质量浓度为10%的稀盐酸溶液调节浆料的pH值为6.0,熟化30min;
(3)用质量浓度为10%的氢氧化钠溶液在15min内调节浆料的pH值为10.0~10.5,熟化30min,然后在60min内并流加入偏铝酸钠和浓度为质量浓度为10%的稀盐酸溶液,维持浆料pH在10.0~10.5,然后熟化60min;所述偏铝酸钠加入量为以Al2O3计为二氧化钛质量的1%;
(4)然后将步骤(3)得到的浆料用质量浓度为10%的稀盐酸溶液在40min内调节并保持pH值为7.0~7.5,熟化30min,包膜结束。
对比例3:(包膜前对浆料在碱性条件下熟化,其他同实施例1)
一种钛白粉无机包膜方法,包括以下步骤:
(1)在金红石型二氧化钛初品中加入去离子水,加入硅酸钠砂磨后制备成TiO2浓度为250g/L的浆料,浆料中硅酸钠的浓度为180g/L,将浆料的温度加热至60℃并保持恒温,并控制整个包膜过程温度在60℃;
(2)在15min内加入质量浓度为10%的氢氧化钠溶液或质量浓度为10%的稀盐酸溶液调节浆料的pH值为9.0,熟化30min;
(3)用质量浓度为10%的氢氧化钠溶液在15min内调节浆料的pH值为10.0~10.5,熟化30min,然后在60min内并流加入偏铝酸钠和浓度为质量浓度为10%的稀盐酸溶液,维持浆料pH在10.0~10.5,然后熟化60min;所述偏铝酸钠加入量为以Al2O3计为二氧化钛质量的1%;
(4)然后将步骤(3)得到的浆料用pH调节剂在40min内调节并保持pH值为7.0~7.5,熟化30min,包膜结束。
分别将实施例1-3及对比例1-3包膜后的钛白粉浆料送到闪干装置进行处理,闪干进料过程中的电流如下表所示。
表1
实施例1 | 实施例2 | 实施例3 | 对比例1 | 对比例2 | 对比例3 | |
电流/A | 6-11 | 7-10 | 6-13 | 14-39 | 19-49 | 16-45 |
Claims (8)
1.钛白粉无机包膜方法,其特征在于,包括以下步骤:
(1)以金红石型二氧化钛初品为原料,加入分散剂砂磨后制备成TiO2浓度为250-260g/L的浆料,将浆料的温度加热至60~65℃并保持恒温;
(2)用pH调节剂调节浆料的pH值为8.0~8.5,熟化20~40min;
(3)用pH调节剂调节浆料的pH值为10.0~10.5,熟化20~40min,然后在45~90min内加入偏铝酸钠,同时用pH调节剂维持浆料pH在10.0~10.5,然后熟化45~90min;所述偏铝酸钠加入量为以Al2O3计为二氧化钛质量的1~3%;
(4)然后将步骤(3)得到的浆料用pH调节剂调节并保持pH值为7.0~7.5,熟化20~40min,包膜结束。
2.根据权利要求1所述的钛白粉无机包膜方法,其特征在于:步骤(1)所述的分散剂为硅酸钠,浆料中硅酸钠的浓度为180~220g/L。
3.根据权利要求1所述的钛白粉无机包膜方法,其特征在于:所述的pH调节剂为质量浓度为10%~15%的稀盐酸或氢氧化钠。
4.根据权利要求1所述的钛白粉无机包膜方法,其特征在于:所述金红石型二氧化钛初品砂磨后平均粒径为0.2~0.3μm。
5.根据权利要求1所述的钛白粉无机包膜方法,其特征在于:所述步骤(1)中在金红石型二氧化钛初品的原料中加入去离子水,制备成TiO2浓度为250-260g/L的浆料。
6.根据权利要求1所述的钛白粉无机包膜方法,其特征在于:所述步骤(2)中在5~15min内用pH调节剂调节浆料的pH值为8.0~8.5。
7.根据权利要求1所述的钛白粉无机包膜方法,其特征在于:所述步骤(3)中在5~15min内用pH调节剂调节浆料的pH值为10.0~10.5。
8.根据权利要求1所述的钛白粉无机包膜方法,其特征在于:所述步骤(4)中在10~50min内用pH调节剂调节浆料的pH值为7.0~7.5。
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