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Method for preparing epoxy cross-linking modified paper wet-strengthening agent

A technology of crosslinking modification and humidification strength agent, which is applied in the direction of strengthening agent addition, etc., which can solve the problem of increased content of adsorbable organic halides, paper wet strength effect not meeting production requirements, PAE crosslinking degree, and low molecular weight and other problems, to improve the retention performance, prevent swelling and water absorption, and enhance the strength

Inactive Publication Date: 2009-03-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PAE without cross-linking modification has low cross-linking degree and molecular weight, and its retention performance is poor. It is still not ideal for some paper types that require high wet strength. The wet strength effect of paper is far from meeting the production requirements. And lead to an increase in the content of adsorbable organic halides (AOX) in the wastewater; and it will bring many adverse effects to the papermaking, such as the pulp is easy to generate air bubbles, flocculation, poor paper uniformity, low rigidity, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: Add diethylenetriamine and adipic acid into a drying reactor at a molar ratio of 0.9:1, heat to 140°C, and keep warm for 7 hours so that the viscosity of the polyamide polyamine in the reactor is 130mPa.s. Ionized water, diluting the polyamide polyamine to a solid content of 50% to obtain the intermediate A of the moisturizing enhancer; then the solution A, epichlorohydrin and water-soluble epoxy resin 681 are mixed according to the quality of 100:5:15 After mixing evenly, add deionized water to dilute the system to a solid content of 20%, react at 50°C for 2 hours, when the system viscosity reaches 40mPa.s, stop heating, and dilute to a solid content of 15% with deionized water , adjust the pH value of the system to 1 with hydrochloric acid, and then get the epoxy cross-linking modified paper moisturizing strength agent.

Embodiment 2

[0009] Example 2: Add diethylenetriamine and adipic acid into a drying reactor at a molar ratio of 1.0:1.0, heat to 160°C, and keep the temperature for 5 hours so that the viscosity of the polyamide polyamine in the reactor is 150mPa.s. Ionized water, diluting the polyamide polyamine to a solid content of 50% to obtain the intermediate A of the moisturizing enhancer; then the solution A, epichlorohydrin and water-soluble epoxy resin 682 are mixed according to the quality of 100:10:10 After mixing evenly, add deionized water to dilute the system to a solid content of 20%, react at 60°C for 3 hours, when the system viscosity reaches 50mPa.s, stop heating, and dilute to a solid content of 12% with deionized water , adjust the pH value of the system to 2 with hydrochloric acid, and then obtain the epoxy cross-linking modified paper moisturizing strength agent.

Embodiment 3

[0010] Example 3: Add diethylenetriamine and adipic acid into a dry reactor at a molar ratio of 1.1:1.0, heat to 200°C, and keep the temperature for 3 hours so that the viscosity of the polyamide polyamine in the reactor is 160mPa.s. Ionized water, diluting the polyamide polyamine to a solid content of 50% to obtain the intermediate A of the moisturizing enhancer; then the solution A, epichlorohydrin and water-emulsion epoxy resin E-20 according to 100:20: After mixing evenly with a mass ratio of 20, add deionized water to dilute the system to a solid content of 20%, react at 80°C for 1 hour, when the system viscosity reaches 55mPa.s, stop heating, and dilute to a solid content with deionized water 12%, adjust the pH value of the system to 4 with glacial acetic acid, and then get the epoxy cross-linking modified paper moisturizing strength agent.

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Abstract

The invention discloses a method for producing an epoxy crosslinking modified paper humidity intensifier. The alkaline cured humidity intensifier polyamide polyamine epoxy chloropropane resin is the mainstream product at present, but the PAE which is not cross-linked and modified is poor in the crosslinking degree and molecular weight and has poor retaining performance, and the humidity-intensifying effect of the paper can not reach the production requirement, and can result in the increase of the adsorptive organic halide in the wastewater. The invention adopts the dibasic acid and polybasic amine as the raw material to produce the intermediate of polyamide polyamine; a certain amount of polyamide polyamine intermediate, epoxy and epoxy chloropropane react under certain temperature until the product reaches a certain viscosity, then acid is added to terminate the reaction and obtain the epoxy crosslinking modified paper humidity intensifier. The method can reduce the consumption of the epoxy chloropropane and decrease the content of organochlorine in the waste; the retaining rate of the product is greatly improved; the product provided by the invention can not only improve the wet strength of the paper but also can increase the physical properties of the paper, such as the folding strength, tensile strength and dry strength and the like.

Description

technical field [0001] The invention belongs to the field of preparation technology of fine chemicals, and in particular relates to a preparation method of an epoxy crosslinking modified paper moisturizing strength agent. Background technique [0002] With the rapid development of the paper industry, traditional paper-making wetting strength agents such as urea-formaldehyde resin (UF) and modified melamine-formaldehyde resin (MF) have been gradually replaced by other products due to environmental pollution and formaldehyde release. [0003] Alkaline-cured wet strength agent polyamide polyamine epichlorohydrin resin (PAE) has become the current mainstream product as a wet strength agent, and it has incomparable advantages over traditional wet strength agents. It not only does not have the problem of formaldehyde release, but also can achieve good wet strength effect under medium-alkaline conditions and low dosage, and has good repulping performance. However, PAE without cros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/18
Inventor 沈一丁费贵强王海花
Owner SHAANXI UNIV OF SCI & TECH
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