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Method for controlling pitch trouble in paper-making process

A barrier and resin technology, applied in papermaking, textile and papermaking, fiber raw material processing, etc., can solve the problems of reducing the specific surface area of ​​inorganic particles and the potential adsorption performance of resin and pulp fibers, achieving low cost, preventing accumulation, and small particle size.

Inactive Publication Date: 2008-12-31
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the introduction of cationic organic polymers also causes the aggregation of inorganic particles, which reduces the specific surface area of ​​inorganic particles and the potential adsorption performance of resin and pulp fibers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation 1 of hydrotalcite: 241 parts of AlCl 3 ·6H 2 O and 610 parts MgCl 2 ·6H 2O was dissolved in 4550 parts of deionized water, and at a stirring speed of 500rpm, slowly added to the reactor at the same time as 2600 parts of dilute ammonia water diluted 3 times, and the pH value of the mixture was controlled between 9.5-10, and the addition time was controlled at 30 minutes or so. After the addition, the stirring was continued for 2 hours to obtain a mixed precipitate of magnesium hydroxide and aluminum hydroxide. The precipitate was crystallized at 85°C under airtight conditions for 12 hours, then centrifuged with deionized water (4000r / min) and washed 3 times to obtain the interlayer anion as Cl - Synthetic hydrotalcite suspension, measured by Mastersizer 2000 laser particle size analyzer, the volume average particle size of synthetic hydrotalcite is 0.72 μm. Part of the synthetic hydrotalcite suspension was freeze-dried at -50°C and then ground through a ...

Embodiment 2

[0020] Preparation 1 of synthetic hydrotalcite roasted magnesium-aluminum composite oxide: the interlayer anion through lyophilized vacuum drying in the implementation example 1 is Cl - The synthetic hydrotalcite was placed in a muffle furnace and calcined at 500°C for 3 hours. After cooling, it was ground and passed through a 200-mesh sieve to obtain a magnesium-aluminum composite oxide. The magnesium-aluminum composite oxide was prepared into a suspension with a mass fraction of 1% by deionized water. After the suspension was moderately dispersed by a shearing device, the volume average particle size measured by a Mastersizer 2000 laser particle size analyzer was 46.6 μm.

[0021] Control of resin barrier: Prepare 2000 parts of domestic poplar chemical mechanical pulp containing 30 parts of dry pulp according to Example 1, get 1000 parts of it, and add resin acid with a mass fraction of 1% in Example 1 under stirring After mixing 3 parts of colloid evenly, the pH value of th...

Embodiment 3

[0023] Preparation 2 of synthetic hydrotalcite: 375 parts of Al(NO 3 ) 3 9H 2 O and 770 parts Mg(NO 3 ) 2 ·6H 2 O was dissolved in 4255 parts of deionized water, and slowly added to the reactor at the same time as 2600 parts of dilute ammonia water diluted 3 times at a stirring speed of 500rpm. The pH value of the mixture was controlled between 9.5-10, and the addition time was controlled at 30 minutes or so. After the addition, the stirring was continued for 2 hours to obtain a mixed precipitate of magnesium hydroxide and aluminum hydroxide. The precipitate was crystallized at 85°C under airtight conditions for 16 hours, then centrifuged with deionized water (4000r / min) and washed 3 times to obtain the interlayer anion as NO 3 - The synthetic hydrotalcite suspension, measured by the Mastersizer 2000 laser particle size analyzer, has a volume average particle size of 0.93 μm. Part of the synthetic hydrotalcite suspension was freeze-dried at -50°C and then ground throug...

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Abstract

The invention relates to a method for controlling papermaking resin obstacles, which utilizes the lipotropy and high specific surface area of hydrotalcite-like compounds with positive charges and resin and gummy substances in an adsorption paper pulp with positive electrical property, and the compounds and substances are affixed to paper pulp fibers relying on the positive electrical properties of themselves or the retention function of a retention system, so as to prevent the accumulation of resin and gummy substances in a papermaking system, and control the generation of resin obstacles. A suspension of hydrotalcite-like compounds is generally added in the paper pulp before dilution, and the amount of resin or gummy substances in the paper pulp is generally controlled at between 1:5000 and 1:50 in weight ratio relative to the weight proportion of absolute dry pulp. The adopted hydrotalcite-like compounds have good adsorption property to resin and gummy substances, the adsorption efficiency is high, costs are low, and usage and transportation are convenient.

Description

technical field [0001] The invention relates to a method for controlling papermaking resin barrier, that is, a method for controlling papermaking resin barrier by utilizing positively charged hydrotalcite compounds. Background technique [0002] Resin barrier refers to the deposition of resin from wood pulp and viscous substances from secondary fiber and deinked pulp in the papermaking process during the paper production process, which affects the operating performance of the paper machine, paper quality and production environment. the harm caused. In addition to removing larger resin and sticky particles through enhanced screening, chemical control is currently the main control method for sticky and resin barriers. The control methods mainly include (1) reduce the viscosity of the resin or sticky matter, prevent it from agglomerating and depositing on the surface of the equipment, such as talcum powder, bentonite, non-ionic polymers (such as polyvinyl alcohol, acrylamide-v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/02
Inventor 刘温霞田鹏飞于得海
Owner QILU UNIV OF TECH
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