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Method for preparing water-resistant high-strength functional paper

A high-strength, water-resistant technology, applied in the field of pulp and paper, can solve the problems of lack of dimensional stability and loss of sealing of paper sheets, and achieve the effect of overcoming the increase of paper brittleness and enhancing toughness and strength

Inactive Publication Date: 2010-01-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the strength of the paper sheet mainly relying on hydrogen bonding will not be too high; the surface smoothness and gloss of the paper sheet formed by the interweaving of fibers will not be very high; porosity brings excellent air permeability and absorption, but it is not Loss of airtightness; moisture absorption and swelling properties of fibers, which make paper sheets lack dimensional stability, are obvious deficiencies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: First, add anhydrous CaCl in tetrahydrofuran (THF) 2 , after dehydration for 24 hours, filtered to obtain anhydrous tetrahydrofuran (THF); secondly, polyethylene glycol (PEG400) was added to 3-isocyanate methylene-3,5,5-trimethylcyclohexyl isocyanate (IPDI ) to obtain mixture A, wherein the molar ratio of polyethylene glycol to 3-isocyanate methylene-3,5,5-trimethylcyclohexyl isocyanate (IPDI) is 1:1; Make the mass concentration of mixture A in water tetrahydrofuran (THF) be 12%, then add dibutyltin dilaurate of 0.05% of the mass of anhydrous tetrahydrofuran (THF) as a catalyst, use steam to heat to 60 ° C, and stir to obtain a mixed solution ; Then, soak the paper that has been dried at 105°C for 4 hours in the mixed solution, and control the temperature at 60°C for 5 minutes, then take out the paper and dry it at 120°C for 10 minutes under a vacuum of 1.1Mpa to remove excess organic solvent; finally, heat and cure the paper at 120°C for 5 minutes to obtain...

Embodiment 2

[0013] Example 2: First, add anhydrous CaCl in tetrahydrofuran (THF) 2 , after dehydration for 24 hours, filtered to obtain anhydrous tetrahydrofuran (THF); secondly, polyethylene glycol (PEG400) was added to 3-isocyanate methylene-3,5,5-trimethylcyclohexyl isocyanate (IPDI ) to obtain mixture A, wherein the molar ratio of polyethylene glycol to 3-isocyanate methylene-3,5,5-trimethylcyclohexyl isocyanate (IPDI) is 1:3; Make the mass concentration of mixture A in water tetrahydrofuran (THF) be 14%, then add dibutyltin dilaurate of 0.05% of the mass of anhydrous tetrahydrofuran (THF) as a catalyst, use steam to heat to 62 ° C, stir to obtain a mixed solution ; Then, soak the paper that has been dried at 105°C for 4 hours in the mixed solution, and control the temperature at 62°C for 5 minutes, then take out the paper and dry it at 100°C for 10 minutes under a vacuum of 0.8Mpa to remove excess organic solvent; finally, heat and cure the paper at 130°C for 5 minutes to obtain wat...

Embodiment 3

[0014] Example 3: First, add anhydrous CaCl in tetrahydrofuran (THF) 2 , after dehydration for 24 hours, filtered to obtain anhydrous tetrahydrofuran (THF); secondly, polyethylene glycol (PEG400) was added to 3-isocyanate methylene-3,5,5-trimethylcyclohexyl isocyanate (IPDI ) to obtain mixture A, wherein the molar ratio of polyethylene glycol to 3-isocyanate methylene-3,5,5-trimethylcyclohexyl isocyanate (IPDI) is 1:2; Make the mass concentration of mixture A in water tetrahydrofuran (THF) be 10%, then add dibutyltin dilaurate of 0.05% by mass of anhydrous tetrahydrofuran (THF) as a catalyst, use steam to heat to 61 ° C, and stir to obtain a mixed solution ; Then, soak the paper that has been dried at 105°C for 4 hours in the mixed solution, and control the temperature at 61°C for 5 minutes, then take out the paper and dry it at 115°C for 10 minutes under a vacuum of 1.2Mpa to remove excess organic solvent; finally, heat and cure the paper at 123°C for 5 minutes to obtain wat...

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PUM

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Abstract

The invention provides a method for preparing water-resistant high-strength functional paper, which comprises the following steps: dehydrating tetrahydrofuran (THF) by adding anhydrous calcium chloride (CaCl2) for 24 hours; filtering to obtain anhydrous THF; adding polyethylene glycol to 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (also known as isophorone diisocyanate, IPDI for short) to obtain a mixture A; adding the mixture A to the anhydrous THF; then, adding dibutyltin dilaurate as a catalyst, heating to 60 to 62 DEG C, and evenly stirring to obtain a mixed solution; impregnating paper with the mixed solution, and drying to remove the excessive organic solvent; and further heating and curing the paper to obtain the water-resistant high-strength functional paper. The modification of the invention to the body paper leads to average increases in the breaking length by 4.38 times, the folding endurance by 28.73 times and the burst index by 6.73, average wet strength / dry strength of 51% and average reduction in the opacity to about 60% from the original.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and in particular relates to a preparation method of water-resistant high-strength functional paper. Background technique [0002] As a natural plant fiber paper, although it has many excellent properties, it also has many limitations and deficiencies. For example, the strength of the paper sheet mainly relying on hydrogen bonding will not be too high; the surface smoothness and gloss of the paper sheet formed by the interweaving of fibers will not be very high; porosity brings excellent air permeability and absorption, but it is not The loss of sealing; the moisture absorption and swelling characteristics of the fiber, which make the paper sheet lack dimensional stability, are all obvious deficiencies. With the development of science and the improvement of human material and cultural life, and the continuous expansion of the application field of paper as a sheet material, the requirements...

Claims

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Application Information

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IPC IPC(8): D21H23/76D21H23/32D21H25/06D21H17/57
Inventor 李佩燚王志杰夏新兴林春涛李鸿魁王建
Owner SHAANXI UNIV OF SCI & TECH
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