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Preparation method of organically modified hydrotalcite-based flame retardant for paper

A technology for modifying water and talc. It is applied in the directions of adding paper, fire retardant and inorganic compound, etc. It can solve the problems of low retention rate, easy agglomeration of hydrotalcite, poor adsorption, etc. degree and opacity, the effect of not easy to agglomerate

Inactive Publication Date: 2019-07-09
WEIFANG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention adopts a preparation method of an organically modified hydrotalcite-based paper flame retardant to solve the technical problems that hydrotalcite is easy to agglomerate, has poor adsorption with paper fibers, and has low retention rate.

Method used

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  • Preparation method of organically modified hydrotalcite-based flame retardant for paper
  • Preparation method of organically modified hydrotalcite-based flame retardant for paper
  • Preparation method of organically modified hydrotalcite-based flame retardant for paper

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[0037] The preparation method of the hydrotalcite-based paper flame retardant of the present invention prepares the composite modified hydrotalcite with cationic polymer intercalation and coupling agent covering through the method of ion exchange. Specifically include the following steps:

[0038] A preparation method of an organically modified hydrotalcite type paper flame retardant, comprising the following steps:

[0039] (1) Sodium hydroxide (NaOH) and sodium carbonate (NaOH) 2 CO 3 ) was dissolved in water to prepare a mixed alkali solution.

[0040] Dissolve magnesium salt and aluminum salt in water to prepare mixed salt solution. Magnesium salt is one or more of magnesium nitrate, magnesium chloride, magnesium sulfate, aluminum salt is one or more of aluminum nitrate, aluminum chloride, aluminum sulfate, and Mg 2+ with Al 3+ The molar ratio is 1:1 or 2:1 or 3:1.

[0041] (2) Slowly add the mixed alkali solution and the mixed salt solution prepared in step (1) into...

Embodiment 1

[0046] Double titration synthesis method: molar ratio Mg 2+ :Al 3+ =2:1 Weigh 12.8g Mg(NO) 2 ·6H 2 O and 9.3g Al(NO) 3 9H 2 Dissolve O together in 100.0ml deionized water to prepare a mixed salt solution, mix well and pour the solution into a constant pressure funnel; weigh 8.1g NaOH and 1.5g NaOH 2 CO 3Dissolve in 100.0ml deionized water to prepare a mixed alkali solution, mix well and pour the solution into a constant pressure funnel; then slowly add the mixed salt solution and the mixed alkali solution dropwise into the reaction vessel at room temperature, and keep The pH value of the solution in the reaction vessel is about 10-11; after the dropwise addition, stir for 1.0h to prepare Mg-Al-CO 3 - LDHs precursors. Then heat up to 80°C, add 2.0ml of 10.0% polyvinylamine solution, stir and react at constant temperature for 1.0h, then add 2.0g of titanate coupling agent NDZ-201 dissolved in 50.0ml of ethanol and stir at 80°C for 2.0 h; stop stirring, keep warm at 80°C ...

Embodiment 2

[0054] Single titration synthesis method: Weigh 8.0g NaOH and 1.5g NaOH 2 CO 3 Dissolve in 200.0ml deionized water to prepare a mixed alkali solution, mix well and pour the solution into a 500.0ml three-necked flask; molar ratio Mg 2+ :Al 3+ = 2:1 Weigh 19.2gMg(NO) 2 ·6H 2 O and 9.3g Al(NO) 3 9H 2 Dissolve O in 100.0ml deionized water to prepare a mixed salt solution, mix well and pour the solution into a constant pressure funnel; then slowly add the mixed salt solution to the mixed alkali solution at room temperature, and keep the pH value of the solution during the dropping process At about 10-11; After the dropwise addition, stir for 1.0h, then raise the temperature to 80°C, add 2.0ml of 10.0% polyethyleneimine solution, stir at constant temperature for 1.0h, then add 2.0g of silane dissolved in 50.0ml of ethanol The coupling agent KH-550 was stirred and reacted for 2.0 hours; the stirring was stopped, and the temperature was kept for 18.0 hours; the slurry obtained a...

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Abstract

The invention discloses a preparation method of an organically modified hydrotalcite-based flame retardant for paper. The preparation method comprises the following steps: (1) dissolving a magnesium salt and an aluminum salt in water to obtain a mixed salt solution, and dissolving sodium hydroxide and sodium carbonate in water to obtain a mixed alkali solution; (2) adding the mixed alkali solutionand the mixed salt solution to a reaction vessel slowly and dropwise by using a constant-pressure funnel, during which the pH value of the solution in the reaction vessel is maintained around a rangeof 10-11, and stirring for reaction for 1.0 hour after the dropwise addition is finished; (3) raising the temperature to 80 DEG C, adding a cationic polymer to the reaction vessel, stirring for reaction at a constant temperature of 80 DEG C for 1.0 hour, then adding a coupling agent dissolved in ethanol and stirring for reaction for 2.0 hours, and stopping stirring and holding temperature for 18hours; and (4) naturally cooling the product after the temperature holding, and finally filtering, washing and drying the cooled slurry. The organically modified hydrotalcite-based flame retardant forpaper disclosed in the invention is characterized in that the hydrotalcite is not prone to agglomeration and the adsorption and retention of the hydrotalcite with paper fibers can be improved effectively, allowing the hydrotalcite to have promising application prospects.

Description

technical field [0001] The invention belongs to the technical field of flame retardant material preparation, and in particular relates to a preparation method of an organically modified hydrotalcite-based paper flame retardant. Background technique [0002] Since entering the 21st century, growing environmental problems and the depletion of petroleum resources have drawn more and more attention to the demand for using natural and renewable resources to replace petroleum products. Cellulose, obtained from wood and cotton, is our most abundant natural polymer. Wood-based cellulose has been a staple raw material for the pulp and paper industry for more than a century. Paper can be described as a three-dimensional fiber network formed from a dilute aqueous suspension of pulp fibers, and it is considered a biodegradable, recyclable, inexpensive material. It is for these reasons that paper and fiber networks are used in many applications such as corrugated fibreboard, packaging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/34D21H17/69
CPCD21H17/69D21H21/34
Inventor 邢仁卫杨志勇周燕彭翠翠
Owner WEIFANG UNIV OF SCI & TECH
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