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Paper coating lubricant

A lubricant and coating technology, used in papermaking, textile and papermaking, fiber raw material processing, etc., can solve the problems of large amount of emulsifier, affecting coating operations, easy to form foam, etc., to improve wall adhesion and difficult to wash. , the effect of not easy to pour out

Inactive Publication Date: 2011-02-09
浙江池河科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still the problem that the amount of emulsifier is too large, resulting in high cost, and it is easy to form foam during the coating process, which will affect the coating operation and paper quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 390g of stearic acid and 130g of coconut oleic acid into a 1000ml four-neck flask equipped with a stirrer, turn on the stirrer, raise the temperature to 85°C and keep the temperature until the system is in a molten state, then add 85g of calcium hydroxide and 7.5g of OP -10 and 7.5g Span-60, continue to keep warm, then add the sulfonate aqueous solution containing 20g Tween-60 and 20g NP-10 dissolved in 100g deionized water prepared in advance into the flask, and add 240g deionized water , 85 ~ 98 ℃ reaction 3.5h. After stopping the reaction, cool down to 40°C naturally, and discharge to obtain a lubricant for paper coating.

[0043] The sulfonate of NP-10 is prepared by the conventional sulfonation reaction method, and the specific process is as follows: add NP-10 in the flask, cool to 5 ° C with ice water, and add concentrated sulfuric acid to carry out sulfonation reaction (the excess of concentrated sulfuric acid is should), after the reaction finishes, adding ...

Embodiment 2

[0047]Add 390g of stearic acid and 50g of coconut oleic acid into a 1000ml four-necked flask equipped with a stirrer, turn on the stirrer, raise the temperature to 90°C and keep the temperature until the system is in a molten state, add 65g of calcium hydroxide, 5g of OP-10 and 10gSpan-60, continue to keep warm, and then add the aqueous solution containing 20g Tween-80 and 20g NP-15 sulfonate dissolved in 100g deionized water into the flask, and add 340g deionized water, 90~98 ℃ reaction 2h. After stopping the reaction, cool down to 55°C naturally, and discharge to obtain a lubricant for paper coating.

[0048] The preparation of NP-15 sulfonate was the same as in Example 1 except that NP-10 was replaced by NP-15.

[0049] The prepared lubricant has a solid content of 53.7%, a viscosity of 50 mPa.s, a pH of 9.1 and a particle size of 0.30 μm.

Embodiment 3

[0051] Add 520g of stearic acid and 30g of coconut oleic acid into a 1000ml four-necked flask equipped with a stirrer, turn on the stirrer, raise the temperature to 81°C until the system is in a molten state, add 100g of calcium hydroxide, 5g of OP-10 and 3gSpan-60, continue to keep warm, and then add the prepared aqueous solution containing 20g Tween-40 and 20g OP-10 sulfonate dissolved in 100g deionized water into the flask, and add 202g deionized water, 83~98 ℃ reaction 5h. After stopping the reaction, cool down to 55°C naturally, and discharge to obtain a lubricant for paper coating.

[0052] The preparation of OP-10 sulfonate was the same as in Example 1 except that NP-10 was replaced by OP-10.

[0053] The prepared lubricant has a solid content of 66.7%, a viscosity of 185 mPa.s, a pH of 10.8 and a particle size of 0.71 μm.

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Abstract

The invention discloses a paper coating lubricant, which is prepared from the following raw materials in percentage by mass: 35 to 57 percent of stearic acid, 1 to 23 percent of modifier, 0.5 to 3 percent of dispersing agent, 5 to 15 percent of basifier, 1 to 7 percent of emulsifier and the balance of water. The invention also discloses a method for preparing the paper coating lubricant, which comprises the following steps of: heating the stearic acid and the modifier into a molten state at the temperature of between 80 and 98 DEG C; adding the basifier and the dispersing agent with stirring and uniformly mixing; and adding aqueous solution of the emulsifier, reacting at the temperature of between 80 and 98 DEG C for 1 to 6 hours, and cooling and discharging to prepare the paper coating lubricant. The paper coating lubricant has the advantages of small grain size, high solid content, low viscosity, better dispersability during use, high stability and suitability for a high-speed coating process.

Description

technical field [0001] The invention relates to the technical field of papermaking chemicals, in particular to a paper coating lubricant. Background technique [0002] In recent years, the demand for coated paper has been increasing. In the coating process, in order to promote the fluidity and leveling of the coating, and to improve the smoothness and gloss of the coating, it is necessary to use a lubricant in the coating. The use of lubricants can improve the printing adaptability of coated paper, prevent the occurrence of powder removal, cracking and peeling, so as to achieve the purpose of improving coating and improving the quality of finished paper. The most widely used paper coating lubricant is a water-insoluble metal soap surfactant represented by stearic acid soap. Stearic acid soap is insoluble in water, so it must be formulated into a dispersion (commonly known as SCD dispersion) before it can be added to the paint. [0003] However, the stearic acid soap lubric...

Claims

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Application Information

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IPC IPC(8): D21H21/14
Inventor 裴金东陈冬平
Owner 浙江池河科技有限公司
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