Method of preparing etherified aminoresin sheet stiffness agent

A technology of etherified amino resin and stiffness agent, used in papermaking, textile and papermaking, fiber raw material processing, etc., can solve the problem that other strength properties of paper cannot be well improved, the quality requirements of high-end products are not met, and the strength is reduced, etc. problems, achieve excellent stability and water solubility, improve water resistance, and improve printability.

Inactive Publication Date: 2010-09-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of traditional stiffness additives is that while improving the stiffness of the paper, other strength properties of the paper cannot be improved well, and if used improperly, it will also lead to a decrease in strength
Many domestic manufacturers try to improve the ring crush strength of paper through some physical methods. Although they have achieved certain results, they are still far from meeting the quality requirements of high-end products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: First, mix 37.8g melamine and 73g paraformaldehyde, adjust the pH value of the system to 9.0 with sodium hydroxide and triethanolamine, heat to 80°C, continue to stir and react for 1.0h after the reaction system is clarified, and cool to room temperature, the product Repeatedly washed with water until there is no formaldehyde smell, filtered, and dried to obtain methylolmelamine HM; secondly, add 76.8g of methanol to HM, adjust the pH value to 3 with nitric acid, stir and heat up to 30°C, after the methylolmelamine is completely dissolved Time the etherification reaction for 0.5h; finally, adjust the pH value of the etherified methylol melamine to 8.0 with triethanolamine at room temperature, and keep it warm for 0.5h to prepare the etherified amino resin paper stiffness agent.

Embodiment 2

[0012] Example 2: First, 37.8g melamine and 73g mass concentration of 37% formaldehyde solution and 12g paraformaldehyde are mixed, the pH value of the system is adjusted to 8.5 with sodium hydroxide, heated to 75°C, and the reaction system is clarified and then stirred for 1.5 h, cooled to room temperature, the product was repeatedly washed with water until there was no formaldehyde smell, filtered, and dried to obtain methylol melamine HM; secondly, 64g methanol and 74g n-butanol were added to HM, and the pH value was adjusted to 6 with oxalic acid, and the temperature was stirred to After methylolmelamine is completely dissolved at 45°C, time the etherification reaction for 1.0h; finally, adjust the pH value of the etherified methylolmelamine to 7.5 with diethanolamine at room temperature, and keep it warm for 0.5h to obtain etherification Amino resin paper stiffness agent.

Embodiment 3

[0013] Example 3: First, 37.8 g of melamine and 146 g of formaldehyde solution with a mass concentration of 37% were mixed, and the pH value of the system was adjusted to 9.0 with diethanolamine, and heated to 70° C. After the reaction system was clarified, the stirring reaction was continued for 1.0 h, and cooled to room temperature. The product was repeatedly washed with water until there was no formaldehyde smell, filtered, and dried to obtain methylolmelamine HM; secondly, 86.4 g of n-butanol was added to HM, the pH value was adjusted to 5 with glacial acetic acid, and the temperature was raised to 40°C with stirring, and the methylolmelamine After complete dissolution, time the etherification reaction for 0.5h; finally adjust the pH value of the etherified methylol melamine to 9.0 with sodium hydroxide at room temperature, and keep it warm for 0.5h to obtain the etherified amino resin paper stiffness agent.

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PUM

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Abstract

The invention discloses a method for preparing an etherified amino resin paper stiffness agent, which comprises: using melamine and formaldehyde as reactants, using alkali to adjust the pH value of a system to be alkali, heating the reactants to carry out hydroxymethylation reaction, water-washing a product repeatedly to have no formaldehyde smell, and filtering and drying the product to obtain methylol melamine HM; adding alcohol etherifying agent into the HM, using acid to adjusting the pH value to be acid, and etherifying the HM after full dissolving; and reducing the temperature, using alkali to adjust the pH value, and preserving heat to obtain etherified poly-methylol melamine resin paper stiffness agent. The product has good stability and water resistance, not only can improve the stiffness of the finished paper, but also can adsorb fine fibers, reduce lint and dust fall, improve the physical properties of the finished product such as wet friction resistance, wet strength, dry strength, surface strength and the like, and effectively improve the printing adaptability of the paper.

Description

technical field [0001] The invention belongs to the field of fine chemicals preparation technology, in particular to a preparation method of etherified amino resin paper stiffness agent. Background technique [0002] my country is a big country in the papermaking industry. Due to the lack of domestic wood fiber raw materials, secondary fibers are mostly used, which brings problems such as short fibers and poor strength. Most enterprises can only produce medium and low-grade products, and there is a serious shortage of high-end products, which need to be imported in large quantities. The stiffness of the paper is not enough. During the printing process with high printing speed, there will be downtime due to folding, and the phenomenon of shelving seriously affects the normal use of users and brings a lot of troubles to printing companies. Therefore, it is particularly important to improve the stiffness of paper and paperboard. [0003] The disadvantage of traditional stiffne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/14D21H17/51
Inventor 李小瑞赖小娟王磊刘敬松
Owner SHAANXI UNIV OF SCI & TECH
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