Method for efficiently making paper by using polyester fibers
Technical Field
The invention relates to the field of functional paper processing, in particular to a method for efficiently making paper by utilizing polyester fibers.
Background
The paper industry is one of ten major pillar industries of national economy in developed countries. The development of the optoelectronic industry is promoted by the emergence of the laser industry, which is the backbone industry of the information industry. Through rapid growth for many years, the paper making industry of China gradually enters a mature stage after 2012, and in recent years, the paper making industry of China is gradually developed towards functional paper in transformation and upgrading. Functional paper prepared from fibers developed in the novel textile field through a papermaking process becomes the key for upgrading the papermaking industry.
With the development of textile industry and the continuous and deep research on chemical fiber, more and more new varieties of chemical fiber are developed, and the chemical fiber is widely applied to the papermaking industry for making paper with various special purposes. Polyester fiber is also called terylene, and is an important raw material for producing special paper. The polyester fiber has wide application field in papermaking, comprises filter materials, electric appliance materials, special anti-counterfeiting ticket paper, packing paper and the like, is mixed with other synthetic pulp with high temperature resistance and insulating property to make paper, and can be made into high temperature resistant polyester fiber insulating paper. However, since polyester fibers are typically hydrophobic fibers, they have poor dispersibility in water during papermaking and must be modified.
The researches for improving the hydrophilic performance of the polyester fiber mainly comprise two types: the physical method is used for improving the hydrophilicity of the fiber by blending or composite spinning with hydrophilic substances, or improving the water wettability of the surface of the fiber by carrying out fiber micropore treatment and fiber section abnormity; the other is a chemical method, which leads macromolecules to have hydrophilicity by introducing hydrophilic monomer block copolymerization or carries out hydrophilic finishing on the fiber surface by hydrophilic monomer graft copolymerization.
Chinese patent publication No. 103981711B discloses a method for hydrophilic modification of polyester fibers by PVA, which comprises pretreating the polyester fibers under the alkaline condition of sodium hydroxide, then putting the polyester fibers into the PVA, adding 25% GA by mass in the acidic environment of acetic acid, methanol and sulfuric acid, and carrying out graft modification on the polyester fibers. The modification method has the advantages that the improvement on the polyester hydrophilicity is obvious, but when the modified polyester fiber is applied to the papermaking process, the bonding strength between the fiber and a base material is insufficient, and the performance of finished paper is influenced. In addition, waste liquid and waste gas generated in the production process can not meet the requirement of environmental protection, and is not beneficial to large-scale popularization and production.
Therefore, in the papermaking process, the polyester fiber is required to have good hydrophilicity, and the polyester fiber is required to have certain fiber bonding force to be bonded with a base material, so that the large-scale papermaking is easy. Obviously, the prior polyester fiber still needs to be further modified to improve the papermaking performance and papermaking efficiency.
Disclosure of Invention
The invention provides a method for efficiently making paper by utilizing polyester fibers, aiming at the technical defects of poor dispersion performance of the polyester fibers in a paper making liquid, insufficient bonding strength between the fibers and a base material and low paper making efficiency in the prior art.
In order to solve the above problems, the present invention provides a method for efficiently making paper by using polyester fibers, which is prepared by using polyester fibers with surface grafted with allyl amine as a paper making raw material, the method comprising:
(1) carrying out low-temperature plasma treatment on the polyester fiber, then carrying out liquid phase grafting treatment, and drying and washing to obtain the polyester fiber with the surface grafted with the allylamine;
(2) weighing 50-85 parts by weight of polyester fiber with surface grafted with allylamine, 5-50 parts by weight of auxiliary agent and 1-5 parts by weight of plant fiber, adding water, and fully stirring and dispersing to obtain slurry;
(3) forming the slurry on a net;
(4) dehydrating, squeezing, drying to obtain a polyester fiber paper blank, and adhering the manufactured polyester fiber paper blank to the surface of the polytetrafluoroethylene ultrathin film by utilizing glow discharge plasma;
(5) hot press forming, and obtaining a finished product through trimming and coiling;
wherein the length of the polyester fiber is 5-25 mm; the allyl amine is colorless transparent liquid with the molecular weight of 100-1000 and the melting point of 79-88 ℃; the plant fiber is one or more than two mixed fiber pulp of softwood pulp fiber, hardwood pulp fiber, bamboo fiber, wheat straw fiber, reed fiber, tobacco stalk fiber, corn stalk fiber and sugarcane fiber; the auxiliary agent is one or more of sodium polyphosphate, rosin size, aluminum sulfate, talcum powder and calcium carbonate filler.
Preferably, the low-temperature plasma treatment process adopts a reaction gas source, the discharge time is set to 180-.
Preferably, the liquid phase grafting treatment is to place the polyester fiber after low-temperature plasma treatment into a reaction bottle for grafting, wherein the reaction liquid is a solution with the volume percentage concentration of 5-10% of allyl amine, the grafting temperature is 50-65 ℃, and the grafting time is 2-4 hours.
Preferably, the pulp on-line forming is forming by using a surface net, a material net, an inclined net or a cylinder mould papermaking technology.
Preferably, the drying process is a natural drying process by maintaining the ambient temperature at 80-100 ℃.
Preferably, the thickness of the polytetrafluoroethylene ultrathin film is 0.008 mm;
preferably, the hot press molding is carried out by adopting a roller press at the temperature of 120-300 ℃ and adopting a line pressure of 50-130kg/CN or a flat plate hot press at the temperature of 120-300 ℃ and under the pressure of 10-35 MPa.
The surface of the polyester fiber is grafted and modified by adopting a plasma method, the surface hydrophilicity of the polyester fiber is obviously improved after the modification of the grafted allyl amine, and the bonding strength between the fiber and a matrix material is improved and the fiber can be molded on a net without damaging the mechanical property of the fiber. Particularly, after the formed polyester fiber paper blank is attached to the polytetrafluoroethylene ultrathin film, glow discharge plasma compounding and pressing are adopted, so that the papermaking efficiency and the paper body performance are improved. Compared with the finished paper made of unmodified polyester fibers, the polyester fiber finished paper prepared by the invention has remarkable advantages in the aspects of paper quality, yield and the like.
Compared with the prior art, the method for efficiently making paper by utilizing the polyester fiber has the outstanding characteristics and excellent effects that:
1. the invention provides a method for efficiently making paper by utilizing polyester fibers, which is characterized in that the surface of the polyester fibers is subjected to grafting modification by an ion method, and the surface hydrophilicity of the polyester fibers is obviously improved after the polyester fibers are modified by grafting allyl amine, so that the paper making efficiency is greatly improved.
2. The polyester fiber with the surface grafted and modified can be uniformly dispersed in the papermaking process, can be mixed with natural fiber for papermaking, has good bonding property with paper pulp, and improves the bonding strength between the fiber and a base material without damaging the mechanical property of the fiber.
3. According to the invention, the polyester fiber paper blank and the polytetrafluoroethylene ultrathin film are laminated and then are compounded and pressed by glow discharge plasma, so that the processing speed is high, the efficiency is high, the preparation efficiency of the polyester fiber paper is greatly improved, and the preparation method is suitable for industrial production.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Firstly carrying out low-temperature plasma treatment on polyester fibers with the length of 5mm, wherein the low-temperature plasma treatment process adopts a reaction gas source, setting the discharge time to be 180s, the discharge power to be 200W, the flow of the reaction gas to be 100sccm and the plasma discharge pressure to be 0.1Pa, then carrying out liquid phase grafting treatment, namely placing the polyester fibers subjected to the low-temperature plasma treatment into a reaction bottle for grafting, placing the reaction liquid into a solution with the volume percentage concentration of 5% of allylamine, grafting the solution at the temperature of 65 ℃ for grafting for 2 hours, and drying and washing the solution to obtain the polyester fibers with the surface grafted with the allylamine;
(2) weighing 50 parts by weight of polyester fiber with surface grafted with allyl amine, 49 parts by weight of softwood pulp fiber and 1 part by weight of sodium polyphosphate to prepare raw materials, adding a proper amount of water, and fully stirring and dispersing to obtain slurry;
(3) the pulp is molded by a material mesh paper technology;
(4) dehydrating, squeezing, keeping the ambient temperature at 80 ℃, naturally drying to obtain a polyester fiber paper blank, and attaching the manufactured polyester fiber paper blank to the surface of a polytetrafluoroethylene ultrathin film by utilizing glow discharge plasma to obtain rough paper;
(5) performing hot-press molding on the raw paper by using a roller press at the temperature of 300 ℃ and under the line pressure of 130kg/CN, and performing trimming and package to obtain a finished product;
the polyester fiber papers obtained in the examples were subjected to the performance test, and the obtained data are shown in table 1.
Example 2
(1) Firstly carrying out low-temperature plasma treatment on polyester fibers with the length of 12mm, wherein the low-temperature plasma treatment process adopts a reaction gas source, setting the discharge time to be 200s, the discharge power to be 160W, the flow of the reaction gas to be 100sccm and the plasma discharge pressure to be 1Pa, then carrying out liquid phase grafting treatment, the liquid phase grafting treatment is that the polyester fibers after the low-temperature plasma treatment are placed into a reaction bottle for grafting, the reaction liquid is a solution with the volume percentage concentration of 6.5 percent of allylamine, the grafting temperature is 55 ℃, the grafting time is 4 hours, and after being dried and washed, the polyester fibers with the surface grafted allylamine are obtained;
(2) weighing 70% by mass of polyester fiber with surface grafted with allyl amine, 10 parts by weight of bamboo fiber and 2 parts by weight of gum mixture, adding a proper amount of water, and fully stirring and dispersing to obtain slurry;
(3) forming the pulp on a net by using a cylinder papermaking technology;
(4) dehydrating, squeezing, keeping the ambient temperature at 90 ℃, naturally drying to obtain a polyester fiber paper blank, and attaching the manufactured polyester fiber paper blank to the surface of a polytetrafluoroethylene ultrathin film by utilizing glow discharge plasma to obtain rough paper;
(5) carrying out hot press molding on the raw paper by using a flat hot press at the temperature of 210 ℃ and the pressure of 20Mpa, and carrying out trimming and rolling to obtain a finished product;
the polyester fiber papers obtained in the examples were subjected to the performance test, and the obtained data are shown in table 1.
Example 3
(1) Firstly carrying out low-temperature plasma treatment on polyester fibers with the length of 25mm, wherein the low-temperature plasma treatment process is to adopt a reaction gas source, set the discharge time to be 250s, the discharge power to be 200W, the flow of the reaction gas to be 100sccm and the plasma discharge pressure to be 10Pa, then carrying out liquid phase grafting treatment, the liquid phase grafting treatment is to graft the polyester fibers after the low-temperature plasma treatment into a reaction bottle, the reaction liquid is a solution with the volume percentage concentration of 5-10% of allylamine, the grafting temperature is 65 ℃, the grafting time is 3 hours, and after being dried and washed, the polyester fibers with the surface grafted with the allylamine are obtained;
(2) weighing 60 parts by weight of polyester fiber with surface grafted with allyl amine, 25 parts by weight of wheat straw fiber and 5 parts by weight of talcum powder, adding a proper amount of water, and fully stirring and dispersing to obtain slurry;
(3) forming the pulp on a net by using a surface net papermaking technology;
(4) dehydrating, squeezing, keeping the ambient temperature at 100 ℃, naturally drying to obtain a polyester fiber paper blank, and attaching the manufactured polyester fiber paper blank to the surface of a polytetrafluoroethylene ultrathin film by utilizing glow discharge plasma to obtain rough paper;
(5) performing hot-press molding on the raw paper by using a roller press at the temperature of 300 ℃ and under the line pressure of 130kg/CN, and performing trimming and package to obtain a finished product;
the polyester fiber papers obtained in the examples were subjected to the performance test, and the obtained data are shown in table 1.
Example 4
(1) Firstly carrying out low-temperature plasma treatment on a polyester fiber with the length of 18mm, wherein the low-temperature plasma treatment process adopts a reaction gas source, setting the discharge time to be 280s, the discharge power to be 190W, the flow of the reaction gas to be 100sccm and the plasma discharge pressure to be 8Pa, then carrying out liquid phase grafting treatment, the liquid phase grafting treatment is that the polyester fiber after the low-temperature plasma treatment is placed into a reaction bottle for grafting, the reaction liquid is a solution with the volume percentage concentration of 9% of allylamine, the grafting temperature is 60 ℃, the grafting time is 4 hours, and after being dried and washed, the polyester fiber with the surface grafted with the allylamine is obtained;
(2) weighing 50 parts by weight of polyester fiber with surface grafted with allyl amine, 47 parts by weight of corn stalk fiber and 3 parts by weight of aluminum sulfate, mixing, adding a proper amount of water, and fully stirring and dispersing to obtain slurry;
(3) the pulp is molded on the net by using a material net papermaking technology;
(4) dehydrating, squeezing, keeping the ambient temperature at 100 ℃, naturally drying to obtain a polyester fiber paper blank, and attaching the manufactured polyester fiber paper blank to the surface of a polytetrafluoroethylene ultrathin film by utilizing glow discharge plasma to obtain rough paper;
(5) performing hot-press molding on the raw paper by adopting a roller press at 135 ℃ under the line pressure of 50kg/CN, and performing trimming and package to obtain a finished product;
the polyester fiber papers obtained in the examples were subjected to the performance test, and the obtained data are shown in table 1.
Example 5
(1) Firstly carrying out low-temperature plasma treatment on polyester fibers with the length of 15mm, wherein the low-temperature plasma treatment process adopts a reaction gas source, setting the discharge time to be 280s, the discharge power to be 190W, the flow of the reaction gas to be 100sccm and the plasma discharge pressure to be 5Pa, then carrying out liquid phase grafting treatment, the liquid phase grafting treatment is that the polyester fibers after the low-temperature plasma treatment are placed into a reaction bottle for grafting, the reaction liquid is a solution with the volume percentage concentration of 9% of allylamine, the grafting temperature is 55 ℃, the grafting time is 2 hours, and after being dried and washed, the polyester fibers with the surface grafted with the allylamine are obtained;
(2) weighing 65 parts by weight of polyester fiber with allyl amine grafted on the surface, 34 parts by weight of a mixture of softwood pulp fiber and hardwood pulp fiber, and 5 parts by weight of calcium carbonate filler, mixing, adding a proper amount of water, and fully stirring and dispersing to obtain a slurry;
(3) forming the pulp on a net by using a cylinder papermaking technology;
(4) dehydrating, squeezing, keeping the ambient temperature at 85 ℃, naturally drying to obtain a polyester fiber paper blank, and attaching the manufactured polyester fiber paper blank to the surface of a polytetrafluoroethylene ultrathin film by utilizing glow discharge plasma to obtain rough paper;
(5) carrying out hot press molding on the raw paper by using a flat hot press at the temperature of 120 ℃ and the pressure of 35Mpa, and carrying out trimming and rolling to obtain a finished product;
the polyester fiber papers obtained in the examples were subjected to the performance test, and the obtained data are shown in table 1.
Comparative example 1
(1) Weighing 65 parts by weight of polyester fiber, 34 parts by weight of a mixture of softwood pulp fiber and hardwood pulp fiber, and 5 parts by weight of calcium carbonate filler, mixing, adding a proper amount of water, and fully stirring and dispersing to obtain a slurry;
(3) forming the pulp on a net by using a cylinder papermaking technology;
(4) dehydrating, squeezing, keeping the ambient temperature at 85 ℃, naturally drying to obtain a polyester fiber paper blank, and attaching the manufactured polyester fiber paper blank to the surface of a polytetrafluoroethylene ultrathin film by utilizing glow discharge plasma to obtain rough paper;
(5) carrying out hot press molding on the raw paper by using a flat hot press at the temperature of 120 ℃ and the pressure of 35Mpa, and carrying out trimming and rolling to obtain a finished product;
the polyester fiber paper prepared in the comparative example was subjected to the performance test, and the data obtained are shown in table 1.
Comparative example 2
(1) Firstly carrying out low-temperature plasma treatment on polyester fibers with the length of 15mm, wherein the low-temperature plasma treatment process adopts a reaction gas source, setting the discharge time to be 280s, the discharge power to be 190W, the flow of the reaction gas to be 100sccm and the plasma discharge pressure to be 5Pa, then carrying out liquid phase grafting treatment, the liquid phase grafting treatment is that the polyester fibers after the low-temperature plasma treatment are placed into a reaction bottle for grafting, the reaction liquid is a solution with the volume percentage concentration of 9% of allylamine, the grafting temperature is 55 ℃, the grafting time is 2 hours, and after being dried and washed, the polyester fibers with the surface grafted with the allylamine are obtained;
(2) weighing 65 parts by weight of polyester fiber with allyl amine grafted on the surface, 34 parts by weight of a mixture of softwood pulp fiber and hardwood pulp fiber, and 5 parts by weight of calcium carbonate filler, mixing, adding a proper amount of water, and fully stirring and dispersing to obtain a slurry;
(3) forming the pulp on a net by using a cylinder papermaking technology;
(4) dehydrating, squeezing to dry, maintaining the ambient temperature at 85 ℃, and naturally drying to obtain a polyester fiber paper blank;
(5) carrying out hot press molding on the paper blank by using a flat hot press at the temperature of 120 ℃ and the pressure of 35Mpa, and carrying out trimming and rolling to obtain a finished product;
after the polyester fiber paper prepared in comparative example 2 was subjected to the performance test, the data obtained are shown in table 1.
Table 1: