CN109183495B - Preparation method of high-transparency transparent paper using bismuth-containing material - Google Patents

Abstract

The invention relates to the field of preparation of new materials for papermaking, in particular to a method for preparing high-transparency transparent paper using bismuth-containing materials; the method of the invention discloses a method for preparing high-transparency transparent paper using bismuth-containing materials. A bismuth-containing nanocellulose suspension is used to fill the porous structure of the wood fiber network with the bismuth-containing nanocellulose suspension, and the light transmittance is improved. High transparency transparent paper. This transparent paper not only has excellent optical properties and surface roughness, but also retains the writable properties of traditional paper, which can be used for the preparation of hand-painted conductive circuit devices; it has excellent morphological stability and meets the requirements of subsequent water-based coating.

Description

A kind of preparation method of high transparency transparent paper using bismuth-containing material

technical field

The invention relates to the field of material preparation, in particular to a preparation method of high-transparency transparent paper using a bismuth-containing material.

Background technique

Transparent paper is a kind of special paper. Because of its excellent optical properties and beautiful visual effects, it is widely used in labels, decoration, food packaging, insulation and other fields. It is more expected to replace plastic films to prepare the next generation of "green" electronic devices; Its light weight and low cost make it an excellent material for light-transmitting buildings and solar cells.

CN106917311A discloses a preparation method of transparent paper, which belongs to nano/micron microstructure materials and preparation technology thereof. The transparent paper referred to in the invention refers to the fiber material composed of nano-scale and micro-scale wood fiber material and whose transparency is greater than 70%. The preparation method is as follows: processing the wood material into wood chips or wood powder; then mixing the wood chips or wood powder with a sodium hypochlorite solution at a certain temperature for a certain period of time to remove the lignin in the wood material; washing with water for multiple times to remove the residue after the reaction Then, most of the water is removed from the cleaned slurry; the product obtained through the above steps is placed in a press, and kept under a certain pressure for a period of time to remove the remaining water to obtain transparent paper. The method of the invention has the characteristics of many types of applicable wood materials, low cost, abundant resources, easy operation, environmental friendliness, high output, no need for complicated equipment and devices, and can be quickly produced in large quantities.

CN106012667A discloses an all-cellulose transparent paper and a preparation method thereof. The paper or plant fiber obtained by the traditional papermaking process is used as the network skeleton, and the homogeneous cellulose solution with a certain solubility is used as the filler and dissolving medium, and the paper is evenly coated on the paper or the dissolving medium. The surface of plant fiber fills the internal pores and dissolves cellulose side chains or part of cellulose in a high-efficiency and low-cost manner to reduce the porosity; improve the flatness through the post-finishing process to form an integrated cellulose composite structure, and then prepare A new low-cost all-cellulose transparent paper is expected to achieve large-scale roll-to-roll industrial production.

CN106915121A discloses a preparation method of transparent paper with surface microstructure, belonging to nano/micron microstructure material and preparation technology thereof. The preparation method of the invention is as follows: firstly, the wood is cut into veneers, and then the veneer is placed in a sodium hypochlorite solution to react for a period of time to remove the lignin; after the lignin is removed, the treated veneer is placed in a microstructure At the same time, a filter membrane is placed above the veneer, and the pattern of the template is transferred to the surface of the transparent paper by means of mechanical pressure, so as to obtain the transparent paper with microstructures on the surface. Compared with other existing methods, the method of the invention has the characteristics of low cost, simple preparation steps, short preparation time and the like.

There are mainly three production methods for the transparent paper prepared by the above patents and the prior art: filtration, extrusion molding and dipping. The transparency of the paper products produced by them is generally less than 80%, and the surface roughness of the paper is relatively high, which cannot meet the requirements of, for example, Requirements in fields such as electronic devices limit the application range of transparent paper.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a preparation method of high-transparency transparent paper using bismuth-containing material.

A kind of preparation method of the high-transparency transparent paper using bismuth-containing material, the preparation technical scheme is as follows:

According to the parts by mass, 0.5-2 parts of wood pulp fibers are dispersed in 80-150 parts of deionized water, then 50-80 parts of bismuth-containing nanocellulose suspension are added, and after stirring evenly, ultrasonically disperse for 20-30 minutes to form The suspension is for subsequent use; then another 20-40 parts of the bismuth-containing nanocellulose suspension is taken, and filtered with a microporous membrane to form a layer of nanocellulose; then the suspension is continued to be filtered on the microporous membrane , to form a cellulose layer; peel off the cellulose layer from the microporous filter membrane, use a clean and flat mold to put it into a hot press at 50-70 ° C for 30-60min, and then turn off the heating of the hot press system, and cooling under pressure-holding conditions, the high-transparency transparent paper using the bismuth-containing material can be obtained.

The described bismuth-containing nanocellulose suspension is prepared according to the following method:

According to the parts by mass, 2-10 parts of wood pulp fibers are dispersed in 100-200 parts of dimethyl sulfoxide, and then 0.8-1.8 parts of sodium hydroxide, 0.2-1 parts of 2-(trimethyl sulfoxide) are added. Silyl)ethoxymethyl chloride, 0.01-0.05 parts of 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl radical and 0.1-0.5 parts of bismuth hexafluoro-2,4 - pentanedione acid, the temperature is controlled at 50-60°C, and the reaction is stirred for 40-60min; after the reaction is completed, 5-15 parts of sodium hypochlorite is added to the reaction kettle, the temperature is raised to 70-80°C, and the reaction is performed for 5-10h; after the reaction is completed Filter, wash three times with a large amount of deionized water; then prepare the fiber into a 0.5%-5% suspension, use a high-pressure homogenizer, homogenize, and take the supernatant after centrifugation to obtain the bismuth-containing nanofibers Suspension.

The wood pulp fiber is bleached softwood pulp or hardwood pulp.

The microporous filter membrane is a polytetrafluoroethylene filter membrane with a pore size of 0.3-0.8 μm.

The hot pressing pressure of the hot press is 3-7MPa.

The method of the invention discloses a preparation method of high-transparency transparent paper using bismuth-containing materials. In the invention, wood pulp fibers are dispersed in dimethyl sulfoxide, and then mixed with sodium hydroxide, 2-(trimethylsilyl) Ethoxymethyl chloride, 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl radical and bismuth hexafluoro-2,4-pentanedione acid for a period of time; then A kind of nanocellulose suspension containing bismuth complex is prepared by reacting sodium hypochlorite with cellulose, and the porous structure of wood fiber network is filled with this kind of nanocellulose suspension containing bismuth, which improves the light transmittance, After hot pressing, a high-transparency transparent paper using bismuth-containing material was prepared. This transparent paper not only has excellent optical properties and surface roughness, but also retains the writable properties of traditional paper, which can be used for the preparation of hand-painted conductive circuit devices; it has excellent morphological stability and meets the requirements of subsequent water-based coating.

Detailed ways

This invention is further described below by specific embodiment:

Example 1

A kind of preparation method of the high-transparency transparent paper using bismuth-containing material, the preparation technical scheme is as follows:

According to the parts by mass, 1.3 parts of wood pulp fibers were dispersed in 120 parts of deionized water, then 60 parts of bismuth-containing nanocellulose suspension were added, and after stirring, ultrasonically dispersed for 25 minutes to form a suspension for later use; 30 parts of the bismuth-containing nanocellulose suspension was filtered using a microporous membrane to form a layer of nanocellulose; then the suspension was continuously filtered on the microporous membrane to form a cellulose layer; the cellulose layer was Peel off from the microporous filter membrane, put a clean and flat mold into a hot press at 60°C for 40 minutes, then turn off the heating system of the hot press, and cool under pressure-holding conditions to obtain the described A high-transparency transparent paper using bismuth-containing materials.

The described bismuth-containing nanocellulose suspension is prepared according to the following method:

According to the parts by mass, 5 parts of wood pulp fibers are dispersed in 150 parts of dimethyl sulfoxide, and then 1.2 parts of sodium hydroxide and 0.6 parts of 2-(trimethylsilyl)ethoxymethyl chloride are added. , 0.03 part of 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl radical and 0.3 part of bismuth hexafluoro-2,4-pentanedione acid, temperature controlled at 55°C, stirring The reaction was carried out for 50 minutes; after the reaction was completed, 10 parts of sodium hypochlorite were added to the reaction kettle, the temperature was raised to 75 ° C, and the reaction was carried out for 8 hours; after the reaction was completed, the reaction was filtered and washed three times with a large amount of deionized water; then the fibers were prepared into a 2.5% suspension, The bismuth-containing nanocellulose suspension can be obtained by using a high-pressure homogenizer to homogenize and centrifuge the supernatant.

The wood pulp fiber is bleached softwood pulp.

The microporous filter membrane is a polytetrafluoroethylene filter membrane with a pore size of 0.5 μm.

The hot pressing pressure of the hot press is 5MPa.

The transparency of the transparent paper prepared in this experiment is 91.6%, and its tensile strength is 102.7MPa.

Example 2

A kind of preparation method of the high-transparency transparent paper using bismuth-containing material, the preparation technical scheme is as follows:

According to the parts by mass, 0.5 parts of wood pulp fibers were dispersed in 80 parts of deionized water, then 50 parts of bismuth-containing nanocellulose suspension were added, and after stirring evenly, ultrasonically dispersed for 20 minutes to form a suspension for later use; 20 parts of the bismuth-containing nanocellulose suspension was filtered using a microporous membrane to form a layer of nanocellulose; then the suspension was continuously filtered on the microporous membrane to form a cellulose layer; the cellulose layer was Peel off the microporous filter membrane, put a clean and flat mold into a hot press at 50°C for 30 minutes, then turn off the heating system of the hot press, and cool under pressure-holding conditions to obtain the A high-transparency transparent paper using bismuth-containing materials.

The described bismuth-containing nanocellulose suspension is prepared according to the following method:

According to the parts by mass, 2 parts of wood pulp fibers are dispersed in 100 parts of dimethyl sulfoxide, and then 0.8 parts of sodium hydroxide and 0.2 parts of 2-(trimethylsilyl)ethoxymethyl chloride are added. , 0.01 part of 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl radical and 0.1 part of bismuth hexafluoro-2,4-pentanedione acid, temperature controlled at 50°C, stirring The reaction was carried out for 40 minutes; after the reaction was completed, 5 parts of sodium hypochlorite was added to the reaction kettle, the temperature was raised to 70 ° C, and the reaction was carried out for 5 hours; after the reaction was completed, filtration was performed and washed three times with a large amount of deionized water; then the fibers were prepared into a 0.5% suspension, The bismuth-containing nanocellulose suspension can be obtained by using a high-pressure homogenizer to homogenize and centrifuge the supernatant.

The wood pulp fiber is hardwood pulp.

The microporous filter membrane is a polytetrafluoroethylene filter membrane with a pore size of 0.3 μm.

The hot pressing pressure of the hot press is 3MPa.

The transparency of the transparent paper prepared in this experiment is 89.7%, and its tensile strength is 98.3MPa.

Example 3

A kind of preparation method of the high-transparency transparent paper using bismuth-containing material, the preparation technical scheme is as follows:

According to the parts by mass, 2 parts of wood pulp fibers were dispersed in 150 parts of deionized water, then 80 parts of bismuth-containing nanocellulose suspension were added, and after stirring evenly, ultrasonically dispersed for 30 min to form a suspension for later use; 40 parts of the bismuth-containing nanocellulose suspension was filtered using a microporous membrane to form a layer of nanocellulose; then the suspension was continuously filtered on the microporous membrane to form a cellulose layer; the cellulose layer was Peel off the microporous filter membrane, use a clean and flat mold to put it into a hot press at 70°C for 60 minutes, then turn off the heating system of the hot press, and cool it under pressure-holding conditions to obtain the described A high-transparency transparent paper using bismuth-containing materials.

The described bismuth-containing nanocellulose suspension is prepared according to the following method:

According to the parts by mass, 10 parts of wood pulp fibers are dispersed in 200 parts of dimethyl sulfoxide, and then 1.8 parts of sodium hydroxide and 1 part of 2-(trimethylsilyl)ethoxymethyl chloride are added. , 0.05 part of 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl radical and 0.5 part of bismuth hexafluoro-2,4-pentanedione acid, temperature controlled at 60°C, stirring The reaction was carried out for 60 minutes; after the reaction was completed, 15 parts of sodium hypochlorite were added to the reaction kettle, the temperature was raised to 80 ° C, and the reaction was carried out for 10 h; after the reaction was completed, filtration was performed, and washed three times with a large amount of deionized water; then the fibers were prepared into a 5% suspension, The bismuth-containing nanocellulose suspension can be obtained by using a high-pressure homogenizer to homogenize and centrifuge the supernatant.

The wood pulp fiber is cotton pulp.

The microporous filter membrane is a polytetrafluoroethylene filter membrane with a pore size of 0.8 μm.

The hot pressing pressure of the hot press is 7MPa.

The transparency of the transparent paper prepared in this experiment is 92.3%, and its tensile strength is 112.3MPa.

Example 4

A kind of preparation method of the high-transparency transparent paper using bismuth-containing material, the preparation technical scheme is as follows:

According to the parts by mass, 0.5 parts of wood pulp fibers were dispersed in 80 parts of deionized water, then 50 parts of bismuth-containing nanocellulose suspension were added, and after stirring evenly, ultrasonically dispersed for 20 minutes to form a suspension for later use; 20 parts of the bismuth-containing nanocellulose suspension was filtered using a microporous membrane to form a layer of nanocellulose; then the suspension was continuously filtered on the microporous membrane to form a cellulose layer; the cellulose layer was Peel off the microporous filter membrane, put a clean and flat mold into a hot press at 50°C for 30 minutes, then turn off the heating system of the hot press, and cool under pressure-holding conditions to obtain the A high-transparency transparent paper using bismuth-containing materials.

The described bismuth-containing nanocellulose suspension is prepared according to the following method:

According to the parts by mass, 10 parts of wood pulp fibers are dispersed in 200 parts of dimethyl sulfoxide, and then 1.8 parts of sodium hydroxide and 1 part of 2-(trimethylsilyl)ethoxymethyl chloride are added. , 0.05 part of 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl radical and 0.5 part of bismuth hexafluoro-2,4-pentanedione acid, temperature controlled at 60°C, stirring The reaction was carried out for 60 minutes; after the reaction was completed, 15 parts of sodium hypochlorite were added to the reaction kettle, the temperature was raised to 80 ° C, and the reaction was carried out for 10 h; after the reaction was completed, filtration was performed, and washed three times with a large amount of deionized water; then the fibers were prepared into a 5% suspension, The bismuth-containing nanocellulose suspension can be obtained by using a high-pressure homogenizer to homogenize and centrifuge the supernatant.

The wood pulp fiber is bleached softwood pulp.

The microporous filter membrane is a polytetrafluoroethylene filter membrane with a pore size of 0.3 μm.

The hot pressing pressure of the hot press is 7MPa.

The transparency of the transparent paper prepared in this experiment is 91.5%, and its tensile strength is 107.2 MPa.

Example 5

A kind of preparation method of the high-transparency transparent paper using bismuth-containing material, the preparation technical scheme is as follows:

According to the parts by mass, 2 parts of wood pulp fibers were dispersed in 150 parts of deionized water, then 80 parts of bismuth-containing nanocellulose suspension were added, and after stirring evenly, ultrasonically dispersed for 30 min to form a suspension for later use; 40 parts of the bismuth-containing nanocellulose suspension was filtered using a microporous membrane to form a layer of nanocellulose; then the suspension was continuously filtered on the microporous membrane to form a cellulose layer; the cellulose layer was Peel off the microporous filter membrane, use a clean and flat mold to put it into a hot press at 70°C for 60 minutes, then turn off the heating system of the hot press, and cool it under pressure-holding conditions to obtain the described A high-transparency transparent paper using bismuth-containing materials.

The described bismuth-containing nanocellulose suspension is prepared according to the following method:

According to the parts by mass, 2 parts of wood pulp fibers are dispersed in 100 parts of dimethyl sulfoxide, and then 0.8 parts of sodium hydroxide and 0.2 parts of 2-(trimethylsilyl)ethoxymethyl chloride are added. , 0.01 part of 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl radical and 0.1 part of bismuth hexafluoro-2,4-pentanedione acid, temperature controlled at 50°C, stirring The reaction was carried out for 40 minutes; after the reaction was completed, 5 parts of sodium hypochlorite was added to the reaction kettle, the temperature was raised to 70 ° C, and the reaction was carried out for 5 hours; after the reaction was completed, filtration was performed and washed three times with a large amount of deionized water; then the fibers were prepared into a 0.5% suspension, The bismuth-containing nanocellulose suspension can be obtained by using a high-pressure homogenizer to homogenize and centrifuge the supernatant.

The wood pulp fiber is cotton pulp.

The microporous filter membrane is a polytetrafluoroethylene filter membrane with a pore size of 0.3 μm.

The hot pressing pressure of the hot press is 6MPa.

The transparency of the transparent paper prepared in this experiment is 91.9%, and its tensile strength is 105.7MPa.

Comparative Example 1

No bismuth-containing nanocellulose suspension was added, and others were the same as in Example 1.

The transparency of the transparent paper prepared in this experiment is 35.8%, and its tensile strength is 32.8MPa.

Comparative Example 2

Without adding bismuth hexafluoro-2,4-pentanedione acid, the others are the same as in Example 1.

The transparency of the transparent paper prepared in this experiment is 81.5%, and its tensile strength is 76.3MPa.

Comparative Example 3

Without adding 2-(trimethylsilyl)ethoxymethyl chloride, the others are the same as in Example 1.

The transparency of the transparent paper prepared in this experiment is 83.9%, and its tensile strength is 76.7MPa.

Comparative Example 4

Without adding 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl radical, the others are the same as in Example 1.

The transparency of the transparent paper prepared in this experiment is 80.1%, and its tensile strength is 72.9MPa.

Claims (5)

1. A preparation method of high-transparency transparent paper using a bismuth-containing material adopts the following preparation technical scheme:

dispersing 0.5-2 parts of wood pulp fiber in 80-150 parts of deionized water according to the mass parts, then adding 50-80 parts of bismuth-containing nano cellulose suspension, stirring uniformly, and performing ultrasonic dispersion for 20-30min to form suspension for later use; then, filtering another 20-40 parts of bismuth-containing nano-cellulose suspension by using a microporous filter membrane to form a nano-cellulose layer; then continuing to filter the suspension on the microporous filter membrane to form a cellulose layer; and (3) stripping the cellulose layer from the microporous filter membrane, putting the cellulose layer on a hot press with the temperature of 50-70 ℃ by using a clean and flat die for hot pressing for 30-60min, then closing a heating system of the hot press, and cooling under the pressure maintaining condition to obtain the high-transparency transparent paper using the bismuth-containing material.

2. The method for preparing a high transparency clear paper using bismuth-containing material according to claim 1, wherein: the bismuth-containing nano-cellulose suspension is prepared according to the following method:

dispersing 2-10 parts of wood pulp fiber in 200 parts of dimethyl sulfoxide (100), then adding 0.8-1.8 parts of sodium hydroxide, 0.2-1 part of 2- (trimethylsilyl) ethoxymethyl chloride, 0.01-0.05 part of 4-oxo-2, 2,6, 6-tetramethylpiperidine-1-oxygen radical and 0.1-0.5 part of bismuth hexafluoro-2, 4-pentanedionic acid, controlling the temperature to be 50-60 ℃, and stirring for reaction for 40-60 min; after the reaction is finished, adding 5-15 parts of sodium hypochlorite into the reaction kettle, heating to 70-80 ℃, and reacting for 5-10 hours; filtering after the reaction is finished, and washing with a large amount of deionized water for three times; then preparing the fiber into 0.5-5% suspension, homogenizing by a high-pressure homogenizer, centrifuging and taking supernatant fluid to obtain the bismuth-containing nano cellulose suspension.

3. The method for preparing a high transparency clear paper using bismuth-containing material according to claim 1, wherein: the wood pulp fiber is bleached softwood pulp or hardwood pulp.

4. The method for preparing a high transparency clear paper using bismuth-containing material according to claim 1, wherein: the microporous filter membrane is a polytetrafluoroethylene filter membrane with the aperture of 0.3-0.8 mu m.

5. The method for preparing a high transparency clear paper using bismuth-containing material according to claim 1, wherein: the hot pressing pressure of the hot press is 3-7 MPa.