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Preparing method of calcium stearate lubricating agent for making paper

A calcium stearate and lubricant technology, applied in papermaking, textile and papermaking, fiber raw material processing, etc., can solve problems such as low solid content, high cost, and coarse particle size

Active Publication Date: 2008-07-02
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium stearate emulsion was used as a coating lubricant for coated paper in my country's paper industry as early as the early 1980s. At present, calcium stearate lubricants are produced all over the country, but the solid content is basically 40-45. %, using a two-step method, that is, to make calcium stearate dry powder first, and then grind and disperse to obtain it. The production process is complicated, the cost is high, the particle size is coarse (generally 1-25 microns), and the solid content is partial Low, unstable storage, prone to precipitation and floating matter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 210 grams of water to a four-necked flask with a thermometer, raise the temperature to 85°C, add 10 grams of emulsifier CA630, 15 grams of EO-50, 22 grams of dispersant sodium polyacrylate, and 4 grams of defoamer tributyl phosphate. After stirring evenly, slowly add 546 grams of molten stearic acid, 85 grams of alkalizing agent sodium hydroxide, 130 grams of calcium chloride, 15 grams of emulsifier G-3300, and 20 grams of PO-50. After the addition was complete, the reaction was incubated at 85°C for 6 hours. Add 2 grams of bactericide tetrachloroisophthalonitrile, stir evenly and cool down. The resulting product has a viscosity of 360mPa.S (measured by a NDJ-1 rotational viscometer, the same below), an average particle diameter of 800nm ​​(measured by a JL-5500 laser particle size distribution tester, the same below), and a weight solid content of 79%.

Embodiment 2

[0027] Add 306 grams of water to a four-necked flask with a thermometer, raise the temperature to 70°C, add 12 grams of emulsifier sorbitan monostearate, 15 grams of PEG400, 10 grams of dispersant sodium tripolyphosphate, sodium polyacrylate 10 grams, 7 grams of water-soluble silicone oil for defoaming agent, after stirring evenly, slowly add 480 grams of molten stearic acid, 80 grams of alkalizing agent calcium hydroxide, 20 grams of emulsifier sorbitan monopalmitate, polyethylene oxide (20) 25 grams of sorbitan monooleate. After the addition was complete, the reaction was incubated at 70°C for 8 hours. Add 3 grams of bactericide phosphorus-chloro-m-cresol, stir evenly and cool down. The resulting product has a viscosity of 150mPa.S, an average particle diameter of 730nm, and a weight solid content of 68%.

Embodiment 3

[0029] Add 550 grams of water to a four-necked flask with a thermometer, heat up to 95°C, add 20 grams of emulsifier polyoxyethylene monolaurate, 10 grams of polyoxyethylene castor oil, and 30 grams of dispersant sodium hexametaphosphate. 9 grams of foaming agent 12-carbon fatty alcohol, after stirring evenly, slowly add 343 grams of molten stearic acid, 60 grams of alkalizing agent calcium hydroxide, 15 grams of emulsifier PEG400, and 30 grams of DP-50. After the addition was complete, the reaction was incubated at 95°C for 8 hours. Add 6 grams of bactericide tributyltin, stir evenly and cool down. The obtained product has a viscosity of 70mPa.S, an average particle diameter of 420nm, and a weight solid content of 45%.

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Abstract

The invention relates to a calcium stearate lubricant for papermaking and a preparation method thereof. The preparation method is characterized in that the method comprises the following steps of: heating water to 50 to 95 DEG C, adding an emulsifying agent A, a dispersant and a defoaming agent, stirring, adding molten stearic acid, an alkalinizing agent and an emulsifying agent B, reacting, adding antibacterial agent, and stirring to obtain the final product. The calcium stearate lubricant has a viscosity range of 70 to 360 mPa.S, particle diameter range of 400 to 800 nm and solid content weight of 40 to 79%. The lubricant is prepared by one-step synthesis to solve the disadvantages of secondary processing of the lubricant such as large cost, large particle diameter, larger viscosity and low efficiency. The lubricant prepared by the method has the advantages of small particle diameter, high solid content, low viscosity, good mechanical and chemical stability, no yellowing, no special smell, high use efficiency, etc.

Description

technical field [0001] The invention relates to a preparation method of a papermaking lubricant mainly composed of calcium stearate, which is mainly used as an auxiliary agent and a functional auxiliary agent in the papermaking coating process. technical background [0002] Calcium stearate lubricant is a water-insoluble metal soap surfactant and is one of the important auxiliary agents for coated paper. Generally, it is made into a water-suspension dispersion, and added to the coating with 0.5-5% of the absolute dry weight of the pigment. By reducing the interfacial tension, the coating has good fluidity and plasticity, reducing paper powder, fluff. Calcium stearate emulsion was used as a coating lubricant for coated paper in my country's paper industry as early as the early 1980s. At present, calcium stearate lubricants are produced all over the country, but the solid content is basically 40-45. %, using a two-step method, that is, to make calcium stearate dry powder firs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/14
Inventor 施晓旦李丽王养臣陈传雨
Owner SHANGHAI DONGSHENG NEW MATERIALS
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