WO2020113964A1 - 一种pvc汽车底涂胶屈服增强用纳米碳酸钙的制备方法 - Google Patents

一种pvc汽车底涂胶屈服增强用纳米碳酸钙的制备方法 Download PDF

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WO2020113964A1
WO2020113964A1 PCT/CN2019/096150 CN2019096150W WO2020113964A1 WO 2020113964 A1 WO2020113964 A1 WO 2020113964A1 CN 2019096150 W CN2019096150 W CN 2019096150W WO 2020113964 A1 WO2020113964 A1 WO 2020113964A1
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calcium carbonate
emulsion
synthesis
diluted emulsion
diluted
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陈晓龙
于福家
丛国龙
胡杰
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东北大学
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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00Compounds of calcium, strontium, or barium
    • C01F11/18Carbonates
    • C01F11/182Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
    • C01F11/183Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds the additive being an organic compound
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00Manufacture or treatment of nanostructures
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24Acids; Salts thereof
    • C08K3/26Carbonates; Bicarbonates
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/60Particles characterised by their size
    • C01P2004/64Nanometer sized, i.e. from 1-100 nanometer
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24Acids; Salts thereof
    • C08K3/26Carbonates; Bicarbonates
    • C08K2003/265Calcium, strontium or barium carbonate
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/011Nanostructured additives

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  • the present invention belongs to the technical field of materials, and in particular relates to a method for preparing nano-calcium carbonate for yield enhancement of PVC automobile primer.
  • PVC plastisol products are PVC plastisol products.
  • the main components are base materials, fillers, plasticizers, adhesives and other auxiliary materials.
  • PVC car bottom coating requires good stone-shock resistance, relatively low viscosity and high yield value, so that it can be easily sprayed during the construction process and can keep its shape from flowing after spraying.
  • Nano-calcium carbonate as a commonly used filler in automotive primers not only can reduce costs but also improve the rheological characteristics of automotive primers; evaluate the viscosity of nano-calcium carbonate used in PVC automotive adhesives to make adhesive
  • the effect of the yield value can be characterized by detecting the viscosity and yield value of the mixed paste of nano-calcium carbonate and plasticizer (DOP);
  • DOP nano-calcium carbonate and plasticizer
  • the high viscosity is too large.
  • the paste emulsion is detected by a Huck viscometer.
  • the Bingham viscosity is generally 700 ⁇ 1200mP ⁇ s, and the yield value is 200 ⁇ 500Pa.
  • the object of the present invention is to provide a preparation method of nano-calcium carbonate for PVC automotive primer yield enhancement, by adding a modifier and a static reaction during the carbonization reaction, and then using the modifier to continue the carbonization reaction
  • the surface treatment makes nano-calcium carbonate easy to disperse. When used in PVC car primers, it gives the car primer a higher yield value, good mechanical properties and excellent construction performance when the viscosity is moderate.
  • the digestion slurry is heated through a 400 mesh sieve to remove coarse particles and impurities to make a calcium hydroxide emulsion;
  • a micro-bubble ultrafine calcium carbonate synthesis reactor is used as a synthesis reaction device; the calcium hydroxide emulsion is diluted with water to a mass concentration of 6-9% to prepare a diluted emulsion; the temperature of the diluted emulsion is reduced to S30° C, placed in the synthesis reaction equipment;
  • the mixed gas is passed into the diluted emulsion under agitation for synthesis; the conductivity and pH of the diluted emulsion are detected online during synthesis; when the conductivity of the diluted emulsion drops to the bottom for the first time and then rises again ,
  • Add crystal thixotropy modifier to the diluted emulsion the amount added is 0.5 ⁇ 1% of the total mass of the calcium oxide fine powder according to the crystal thixotropy modifier ;
  • the crystal thixotropy modifier is selected from p-toluenesulfin Sodium, sodium benzenesulfonate, sodium lignosulfonate, or sodium diethylthiocarbamate; when the conductivity of the diluted emulsion rises back to the value at the time of starting the synthesis, stop the mixing gas and stop stirring to make the diluted emulsion Let stand for 30 ⁇ 50 min; and then mix the mixed gas into the diluted emulsion under agitation condition for synthesis until
  • the particle size D5 (K100nm, specific surface area of 30 ⁇ 130m 2 /g of the nano-calcium carbonate for PVC automobile undercoating yield enhancement.
  • a crystal thixotropy modifier is added to perform a modification process during synthesis, and then the calcium carbonate particles in the reaction slurry are subjected to autonomous modification of the surface of the calcium carbonate particles during the standing heat preservation process, and then added
  • the secondary modification treatment of the surface thixotropy modifier makes the nano-calcium carbonate easy to disperse; P VC car undercoating adhesive yield enhancement nano-calcium carbonate and DOP are mixed at a mass ratio of 5:7 to make a paste emulsion; According to the measurement of the Huck viscometer, when the Bingham viscosity of the paste emulsion is 700 ⁇ 1200mPa.s, the yield value is 800 ⁇ 100 Pa, which can effectively increase the yield value of the rubber product under the same viscosity.
  • the water used in the embodiments of the present invention is deionized water.
  • the microbubble ultrafine calcium carbonate synthesis reactor used in the embodiments of the present invention is the microbubble ultrafine calcium carbonate synthesis reactor in the patent No. CN 204434303 U.
  • Sodium p-toluenesulfinate, sodium benzenesulfonate, sodium ligninsulfonate and sodium diethylthiocarbamate used in the examples of the present invention are commercially available products.
  • modified coconut oil, modified olive oil or modified peanut oil used in the embodiments of the present invention are commercially available products.
  • the DOP (dioctyl phthalate) used in the embodiments of the present invention is a commercially available product.
  • the dilution to a mass concentration of 6-9% means that the mass concentration of calcium hydroxide is 6-9%.
  • the limestone is calcined into calcium oxide at 950°C, and then crushed to a particle size of S20mm to make calcium oxide fine particles; the calcium oxide fine particles are added with hot water at a temperature of 95°C for digestion , To make digestive slurry; the amount of hot water added is 3 times the mass of calcium oxide fine powder;
  • the digestion slurry is heated through a 400 mesh sieve to remove coarse particles and impurities to make a calcium hydroxide emulsion
  • a micro-bubble ultrafine calcium carbonate synthesis reactor is used as a synthesis reaction device; the calcium hydroxide emulsion Dilute it with water to 6% mass concentration to make a diluted emulsion; when the temperature of the diluted emulsion is reduced to 30°C, place it in the synthesis reaction equipment;
  • the mixed gas is introduced into the diluted emulsion under stirring for synthesis; the conductivity and pH value of the diluted emulsion are detected online during synthesis; when the conductivity of the diluted emulsion drops to the bottom for the first time and then rises again , Add crystal thixotropy modifier to the diluted emulsion, the amount added is 0.5% of the total mass of calcium oxide fine powder according to the crystal thixotropy modifier; the crystal thixotropy modifier is sodium p-toluene sulfinate; when diluted When the conductivity of the emulsion rises back to the value at the time of starting the synthesis, stop the mixing gas and stop stirring, and let the diluted emulsion stand for 30 minutes; then mix the gas into the diluted emulsion under stirring conditions for synthesis until the diluted emulsion When the pH value drops to 7, the reaction is stopped to obtain a reaction slurry; the volume percentage of carbon dioxide in the mixed gas is 30%, and the rest is
  • the pasty emulsion After mixing 50g and 70g DOP of nano-calcium carbonate for yield enhancement of PVC automobile primer, the pasty emulsion has a Bingham viscosity of 938mP s as measured by a Hack viscometer, and the yield strength is 867Pa
  • the calcium hydroxide emulsion is diluted with water to a mass concentration of 7%; when the temperature of the diluted emulsion is reduced to 29°C, it is placed in a synthesis reaction device;
  • the addition amount of the crystal thixotropy modifier accounts for 0.6% of the total mass of the calcium oxide fine powder according to the crystal thixotropy modifier; the crystal thixotropy modifier is sodium benzenesulfonate; the diluted emulsion is allowed to stand Time 40min; in mixed gas The volume percentage of carbon dioxide is 40%;
  • the conductivity of the diluted emulsion at the beginning of the synthesis is 7.7ms/cm, the conductivity is 3.9ms/cm when it first drops to the bottom, and when the conductivity reaches 3.9ms/cm, it starts to rise back to 7.7ms/cm , Add crystal thixotropy modifier;
  • the calcium hydroxide emulsion is diluted with water to a mass concentration of 8%; when the temperature of the diluted emulsion is reduced to 28°C, it is placed in a synthesis reaction device;
  • the amount of crystal thixotropic modifier added is 0.8% of the total mass of calcium oxide fine powder according to the crystal thixotropic modifier; the crystal thixotropic modifier is sodium lignosulfonate; Set time 45min; the volume percentage of carbon dioxide in the mixed gas is 60%;
  • the conductivity of the diluted emulsion at the beginning of the synthesis is 7.7ms/cm, the conductivity is 3.5ms/cm when it first drops to the bottom, and when the conductivity reaches 3.5ms/cm, it starts to rise back to 7.7ms/cm , Add crystal thixotropy modifier;
  • the calcium hydroxide emulsion is diluted with water to a mass concentration of 9%; when the temperature of the diluted emulsion is reduced to 27°C, it is placed in a synthesis reaction device;
  • the addition amount of the crystal thixotropic modifier accounts for 1% of the total mass of the calcium oxide fine powder according to the crystal thixotropic modifier; the crystal thixotropic modifier is sodium diethylthiocarbamate; dilution The emulsion is allowed to stand for 50 minutes; the volume percentage of carbon dioxide in the mixed gas is 80%;
  • the conductivity of the diluted emulsion at the beginning of the synthesis is 7.7ms/cm, the conductivity is 2.6ms/cm when it first drops to the bottom, and when the conductivity reaches 2.6ms/cm, it starts to rise back to 7.7ms/cm , Add crystal thixotropy modifier;

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Abstract

一种PVC汽车底涂胶屈服增强用纳米碳酸钙的制备方法,按以下步骤进行:(1)将石灰石煅烧破碎制成细粒;加入热水进行消化;(2)过筛制成乳液;(3)加水稀释后,在温度≤30℃时,置于微泡式超微细碳酸钙合成反应器内;(4)搅拌时通入混合气体;电导率第一次下降至谷底后回升时,加入晶体触变化改性剂;电导率回升至初始值时静置;再搅拌时通气至pH为7;(5)置于反应釜加热保温后。加入表面触变化改性剂搅拌均匀;(6)过滤烘干破碎。本发明的方法获得的产品在粘度相同情况下,能够有效提高胶制品的屈服值。

Description

一种 PVC汽车底涂胶屈服增强用纳米碳酸钙的制备方法 技术领域
[0001] 本发明属于材料技术领域, 特别涉及一种 PVC汽车底涂胶屈服增强用纳米碳酸 钙的制备方法。
背景技术
[0002] 目前大多数汽车底涂胶为 PVC塑溶胶产品, 主要组成成分是基料、 填料、 增塑 齐 1J、 胶粘剂和其他辅助材料。 PVC汽车底涂胶要求抗石击性能好, 施工黏度相对 低、 屈服值高, 这样才可以在施工过程中既容易喷涂, 喷涂后还可以保持自身 形态不流淌。
[0003] 纳米碳酸钙作为汽车底涂胶中常用的一种填料, 不仅能够降低成本还能改善汽 车底涂胶的流变特性; 评价纳米碳酸钙用于 PVC汽车胶对制成胶的粘度与屈服值 的影响, 可以采用检测纳米碳酸钙与增塑剂 (DOP) 混合糊状乳液的粘度和屈 服值进行表征; 5见有的普通纳米碳酸钙产品, 往往粘度适中的屈服值低, 屈服 值高的粘度又太大。 如 50g普通纳米碳酸钙与 70gDOP混溶后采用哈克粘度计对 糊状乳液进行检测, 其宾汉粘度一般为 700~1200mP^s、 屈服值 200~500Pa。
[0004] 由于胶黏剂等工业领域的需要, 国内外已有一些关于降低粘度提高屈服值的碳 酸钙产品或研究成果发表; 这些成果, 有的采用低分子量的脂肪酸如月桂酸、 豆蘧酸等对碳酸钙颗粒表面进行处理, 以得到低粘度碳酸钙产品; 有的采用高 分子量的脂肪酸如棕榈酸、 硬脂酸等对碳酸钙表面进行处理, 以得到高触变性 碳酸钙产品; 有的采用低分子量和高分子量脂肪酸按规定比例混合对碳酸钙表 面进行处理, 以得到粘度和屈服值介于二者之间的碳酸钙产品。 然而, 随着胶 黏剂工业的发展, 以及对胶黏剂产品性能要求的进一步提高, 这些碳酸钙产品 的不足被暴露出来, 已有的产品已经无法满足 PVC底涂胶的需求; 需要有粘度更 低、 屈服值更高, 并且制备胶黏剂粘结力、 成膜机械强度更高的碳酸钙。
发明概述
技术问题 问题的解决方案
技术解决方案
[0005] 本发明的目的是提供一种 PVC汽车底涂胶屈服增强用纳米碳酸钙的制备方法, 通过碳化反应过程中加入改性剂以及静态反应, 再继续碳化反应时再用改性剂 进行表面处理, 使纳米碳酸钙具有易于分散的性能, 在用于 PVC汽车底涂胶时, 在粘度适中的情况下赋予汽车底涂胶更高的屈服值, 良好的力学性能以及优异 的施工性能。
[0006] 本发明的方法按以下步骤进行:
[0007] 1、 将石灰石于 800~1000°C条件下煅烧成氧化钙, 然后破碎至粒径 S20mm, 制 成氧化钙细粒料; 向氧化钙细粒料中加入温度 95~100°C的热水进行消化, 制成 消化料浆; 其中热水加入量为氧化钙细粉料质量的 3~6倍;
[0008] 2、 将消化料浆趁热过 400目筛除去粗颗粒及杂质, 制成氢氧化钙乳液;
[0009] 3、 采用微泡式超微细碳酸钙合成反应器作为合成反应设备; 将氢氧化钙乳液 加水稀释至质量浓度在 6~9%, 制成稀释乳液; 在稀释乳液温度降低至 S30°C时, 置于合成反应设备内;
[0010] 4、 在搅拌条件下向稀释乳液中通入混合气体进行合成; 合成时在线检测稀释 乳液的电导率和 pH值; 当稀释乳液的电导率第一次下降至谷底, 再进行回升时 , 向稀释乳液中加入晶体触变化改性剂, 加入量按晶体触变化改性剂占氧化钙 细粉料总质量的 0.5~1% ; 所述的晶体触变化改性剂选用对甲苯亚磺酸钠、 苯磺 酸钠、 木质素磺酸钠或二乙基硫代氨基甲酸钠; 当稀释乳液的电导率回升至开 始进行合成时的数值时, 停止通入混合气体并停止搅拌, 使稀释乳液静置 30~50 min; 再在搅拌条件下向稀释乳液中通入混合气体进行合成, 直至稀释乳液的 pH 值降低至 7时停止反应, 获得反应料浆; 所述的混合气体中二氧化碳的体积百分 比为 30~80%, 其余为空气;
[0011] 5、 将反应料浆置于反应釜内, 加热至 90~120°C静置保温 20~30min, 然后加入 表面触变化改性剂搅拌均匀进行湿法改性处理, 获得改性料浆; 其中表面触变 化改性剂占反应料浆中的碳酸钙总质量 2~6% ; 所述的表面触变化改性剂选用改 性椰子油、 改性橄榄油或改性花生油; [0012] 6、 将改性料浆过滤后烘干去除水分, 将团聚的部分破碎, 制成 PVC汽车底涂 胶屈服增强用纳米碳酸钙。
[0013] 上述的 PVC汽车底涂胶屈服增强用纳米碳酸钙的粒度 D5(K100nm, 比表面积为 30〜 130m 2/g。
发明的有益效果
有益效果
[0014] 本发明的方法中, 进行合成时加入晶体触变化改性剂进行一次改性处理, 然后 反应料浆中的碳酸钙颗粒在静置保温过程中进行碳酸钙颗粒表面自主修饰, 再 加入表面触变化改性剂进行二次改性处理使纳米碳酸钙具有易于分散的性能; P VC汽车底涂胶屈服增强用纳米碳酸钙与 DOP按质量比 5:7混合后制成糊状乳液; 经哈克粘度计测定测定, 糊状乳液的宾汉粘度在 700~1200mPa.s时, 屈服值 800~ l lOOPa, 即在粘度相同情况下能够有效提高胶制品的屈服值。
发明实施例
本发明的实施方式
[0015] 本发明实施例中采用的水为去离子水。
[0016] 本发明实施例中采用的微泡式超微细碳酸钙合成反应器为公开号 CN 204434303 U的专利中的微泡式超微细碳酸钙合成反应器。
[0017] 本发明实施例中采用的对甲苯亚磺酸钠、 苯磺酸钠、 木质素磺酸钠和二乙基硫 代氨基甲酸钠为市购产品。
[0018] 本发明实施例中采用的改性椰子油、 改性橄榄油或改性花生油为市购产品。
[0019] 本发明实施例中采用的 DOP (邻苯二甲酸二辛酯) 为市购产品。
[0020] 本发明实施例中稀释至质量浓度 6~9%是指氢氧化钙的质量浓度在 6~9%。
[0021] 实施例 1
[0022] 1、 将石灰石于 950°C条件下煅烧成氧化钙, 然后破碎至粒径 S20mm, 制成氧化 钙细粒料; 向氧化钙细粒料中加入温度 95°C的热水进行消化, 制成消化料浆; 其 中热水加入量为氧化钙细粉料质量的 3倍;
[0023] 2、 将消化料浆趁热过 400目筛除去粗颗粒及杂质, 制成氢氧化钙乳液;
[0024] 3、 采用微泡式超微细碳酸钙合成反应器作为合成反应设备; 将氢氧化钙乳液 加水稀释至质量浓度 6%, 制成稀释乳液; 在稀释乳液温度降低至 30°C时, 置于 合成反应设备内;
[0025] 4、 在搅拌条件下向稀释乳液中通入混合气体进行合成; 合成时在线检测稀释 乳液的电导率和 pH值; 当稀释乳液的电导率第一次下降至谷底, 再进行回升时 , 向稀释乳液中加入晶体触变化改性剂, 加入量按晶体触变化改性剂占氧化钙 细粉料总质量的 0.5% ; 晶体触变化改性剂为对甲苯亚磺酸钠; 当稀释乳液的电 导率回升至开始进行合成时的数值时, 停止通入混合气体并停止搅拌, 使稀释 乳液静置 30min; 再在搅拌条件下向稀释乳液中通入混合气体进行合成, 直至稀 释乳液的 pH值降低至 7时停止反应, 获得反应料浆; 所述的混合气体中二氧化碳 的体积百分比为 30%, 其余为空气;
[0026] 其中开始进行合成时稀释乳液的电导率为 7.7ms/cm, 第一次下降到谷底时电导 率为 4.1ms/cm, 电导率达到 4.1ms/cm后, 开始向 7.7ms/cm回升时, 加入晶体触变 化改性剂;
[0027] 5、 将反应料浆置于反应釜内, 加热至 90°C静置保温 30min, 然后加入表面触变 化改性剂搅拌均匀进行湿法改性处理, 获得改性料浆; 其中表面触变化改性剂 占反应料浆中的碳酸钙总质量 2% ; 表面触变化改性剂为改性椰子油;
[0028] 6、 将改性料浆过滤后烘干去除水分, 将团聚的部分破碎, 制成 PVC汽车底涂 胶屈服增强用纳米碳酸钙, 其粒度 D50=92nm, 比表面积为 30m 2/g;
[0029] PVC汽车底涂胶屈服增强用纳米碳酸钙 50g与 70gDOP混合后, 糊状乳液经哈克 粘度计测定其宾汉粘度为 938mP s时, 屈服强度 867Pa
[0030] 实施例 2
[0031] 方法同实施例 1, 不同点在于:
[0032] ( 1) 将石灰石于 900°C条件下煅烧成氧化钙; 向氧化钙细粒料中加入温度 97°C 的热水进行消化; 其中热水加入量为氧化钙细粉料质量的 4倍;
[0033] (2) 将氢氧化钙乳液加水稀释至质量浓度 7%; 稀释乳液温度降低至 29°C时, 置于合成反应设备内;
[0034] (3) 晶体触变化改性剂的加入量按晶体触变化改性剂占氧化钙细粉料总质量 的 0.6% ; 晶体触变化改性剂为苯磺酸钠; 稀释乳液静置时间 40min; 混合气体中 二氧化碳的体积百分比为 40% ;
[0035] 开始进行合成时稀释乳液的电导率为 7.7ms/cm, 第一次下降到谷底时电导率为 3.9ms/cm, 电导率达到 3.9ms/cm后, 开始向 7.7ms/cm回升时, 加入晶体触变化 改性剂;
[0036] (4) 将反应料浆加热至 100°C静置保温 25min, 加入的表面触变化改性剂占反 应料浆中的碳酸钙总质量 3% ; 表面触变化改性剂为改性橄榄油;
[0037] (5) PVC汽车底涂胶屈服增强用纳米碳酸钙, 其粒度 D50=95nm, 比表面积为
90m 2/g;
[0038] PVC汽车底涂胶屈服增强用纳米碳酸钙 50g与 70gDOP混合后, 糊状乳液经哈克 粘度计测定其宾汉粘度为 973mP^s时, 屈服值为 1023Pa。
[0039] 实施例 3
[0040] 方法同实施例 1, 不同点在于:
[0041] ( 1) 将石灰石于 800°C条件下煅烧成氧化钙; 向氧化钙细粒料中加入温度 99°C 的热水进行消化; 其中热水加入量为氧化钙细粉料质量的 5倍;
[0042] (2) 将氢氧化钙乳液加水稀释至质量浓度 8%; 稀释乳液温度降低至 28°C时, 置于合成反应设备内;
[0043] (3) 晶体触变化改性剂的加入量按晶体触变化改性剂占氧化钙细粉料总质量 的 0.8% ; 晶体触变化改性剂为木质素磺酸钠; 稀释乳液静置时间 45min; 混合气 体中二氧化碳的体积百分比为 60% ;
[0044] 开始进行合成时稀释乳液的电导率为 7.7ms/cm, 第一次下降到谷底时电导率为 3.5ms/cm, 电导率达到 3.5ms/cm后, 开始向 7.7ms/cm回升时, 加入晶体触变化改 性剂;
[0045] (4) 将反应料浆加热至 110°C静置保温 25min, 加入的表面触变化改性剂占反 应料浆中的碳酸钙总质量 4% ; 表面触变化改性剂为改性橄榄油;
[0046] (5) PVC汽车底涂胶屈服增强用纳米碳酸钙, 其粒度 D50=94nm, 比表面积为
100m 2/g;
[0047] PVC汽车底涂胶屈服增强用纳米碳酸钙 50g与 70gDOP混合后, 糊状乳液经哈克 粘度计测定其宾汉粘度为 864mPa_s时, 屈服值为 882Pa。 [0048] 实施例 4
[0049] 方法同实施例 1, 不同点在于:
[0050] ( 1) 将石灰石于 1000°C条件下煅烧成氧化钙; 向氧化钙细粒料中加入温度 100
°C的热水进行消化; 其中热水加入量为氧化钙细粉料质量的 6倍;
[0051] (2) 将氢氧化钙乳液加水稀释至质量浓度 9%; 稀释乳液温度降低至 27°C时, 置于合成反应设备内;
[0052] (3) 晶体触变化改性剂的加入量按晶体触变化改性剂占氧化钙细粉料总质量 的 1% ; 晶体触变化改性剂为二乙基硫代氨基甲酸钠; 稀释乳液静置时间 50min; 混合气体中二氧化碳的体积百分比为 80% ;
[0053] 开始进行合成时稀释乳液的电导率为 7.7ms/cm, 第一次下降到谷底时电导率为 2.6ms/cm, 电导率达到 2.6ms/cm后, 开始向 7.7ms/cm回升时, 加入晶体触变化改 性剂;
[0054] (4) 将反应料浆加热至 120°C静置保温 20min, 加入的表面触变化改性剂占反 应料浆中的碳酸钙总质量 6% ; 表面触变化改性剂为改性花生油;
[0055] (5) PVC汽车底涂胶屈服增强用纳米碳酸钙, 其粒度 D50=100nm, 比表面积 为 130m 2/g;
[0056] PVC汽车底涂胶屈服增强用纳米碳酸钙 50g与 70gDOP混合后, 糊状乳液经哈克 粘度计测定其宾汉粘度为 910mP^s时, 屈服值为 987Pa。

Claims

权利要求书 [权利要求 1] 一种 PVC汽车底涂胶屈服增强用纳米碳酸钙的制备方法, 其特征在于 按以下步骤进行:
( 1) 将石灰石于 800~1000°C条件下煅烧成氧化钙, 然后破碎至粒径 <20mm, 制成氧化钙细粒料; 向氧化钙细粒料中加入温度 95~100°C 的热水进行消化, 制成消化料浆; 其中热水加入量为氧化钙细粉料质 量的 3~6倍;
(2) 将消化料浆趁热过 400目筛除去粗颗粒及杂质, 制成氢氧化钙乳 液;
(3) 采用微泡式超微细碳酸钙合成反应器作为合成反应设备; 将氢 氧化钙乳液加水稀释至质量浓度在 6~9%, 制成稀释乳液; 在稀释乳 液温度降低至 S30°C时, 置于合成反应设备内;
(4) 在搅拌条件下向稀释乳液中通入混合气体进行合成; 合成时在 线检测稀释乳液的电导率和 pH值; 当稀释乳液的电导率第一次下降 至谷底, 再进行回升时, 向稀释乳液中加入晶体触变化改性剂, 加入 量按晶体触变化改性剂占氧化钙细粉料总质量的 0.5~1%; 所述的晶 体触变化改性剂选用对甲苯亚磺酸钠、 苯磺酸钠、 木质素磺酸钠或二 乙基硫代氨基甲酸钠; 当稀释乳液的电导率回升至开始进行合成时的 数值时, 停止通入混合气体并停止搅拌, 使稀释乳液静置 30~50min
; 再在搅拌条件下向稀释乳液中通入混合气体进行合成, 直至稀释乳 液的 pH值降低至 7时停止反应, 获得反应料浆; 所述的混合气体中二 氧化碳的体积百分比为 30~80%, 其余为空气;
(5) 将反应料浆置于反应釜内, 加热至 90~120°C静置保温 20~30min
, 然后加入表面触变化改性剂搅拌均匀进行湿法改性处理, 获得改性 料浆; 其中表面触变化改性剂占反应料浆中的碳酸钙总质量 2~6% ; 所述的表面触变化改性剂选用改性椰子油、 改性橄榄油或改性花生油
(6) 将改性料浆过滤后烘干去除水分, 将团聚的部分破碎, 制成 PV c汽车底涂胶屈服增强用纳米碳酸钙。
[权利要求 2] 根据权利要求 1所述的一种 PVC汽车底涂胶屈服增强用纳米碳酸钙的 制备方法, 其特征在于所述的 PVC汽车底涂胶屈服增强用纳米碳酸钙 的粒度 D5(K100nm, 比表面积为 30~130m 2/g。
PCT/CN2019/096150 2018-12-06 2019-07-16 一种pvc汽车底涂胶屈服增强用纳米碳酸钙的制备方法 WO2020113964A1 (zh)

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