CN109930416B - Plant fiber environment-friendly material and preparation method thereof - Google Patents
Plant fiber environment-friendly material and preparation method thereof Download PDFInfo
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- CN109930416B CN109930416B CN201910213676.1A CN201910213676A CN109930416B CN 109930416 B CN109930416 B CN 109930416B CN 201910213676 A CN201910213676 A CN 201910213676A CN 109930416 B CN109930416 B CN 109930416B
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Abstract
The invention discloses a plant fiber environment-friendly material and a preparation method thereof, and the plant fiber environment-friendly material comprises the following materials, by mass, 0-60 parts of rice straws, 0-60 parts of corn straws, 0-60 parts of soybean straws, 0-60 parts of wheat straws, 10-20 parts of wood, 20-30 parts of flax fibers, 10-15 parts of a modification auxiliary agent, 10-15 parts of an adhesive and 5-10 parts of a bleaching agent, wherein the modification auxiliary agent consists of calcium stearate, titanium dioxide, tetrabutyl titanate, dicyandiamide, zinc borate and potassium sulfate, and the adhesive consists of animal glue, starch, a water-soluble fiber derivative, polyvinyl alcohol, water-soluble resin and synthetic resin acrylic latex; the invention utilizes the characteristics of strong toughness of flax fiber and high content of wood fiber through the combination of plant fiber, so that when straw is used as fiber raw material, the defects of insufficient strength and fiber supplement through quantity of straw fiber are avoided, raw materials are saved, and the characteristics of each plant fiber are effectively utilized, thereby achieving the purpose of environmental protection.
Description
Technical Field
The invention relates to the technical field of environment-friendly materials, in particular to a plant fiber environment-friendly material and a preparation method thereof.
Background
Plant fiber is favored by various products due to the effects of complete degradation and pure natural environmental protection, the material is widely applied, the plant fiber material is applied to articles suitable for daily life such as fifteen-pack paper, wallpaper, degradable catering boxes, packaging bags and the like, the plant fiber comprises various materials such as cellulose, hemicellulose, lignin and the like, and the plant also contains components such as glue and lipid, so that the plant fiber is utilized, and simultaneously the interference factor is also required to be removed, and the ecological damage is avoided.
The wallpaper is mainly used as a modern decoration material and is touted by the diversity and the replaceability, the wallpaper is mainly characterized by toughness and plasticity, the traditional wallpaper is prepared by pure wood fiber or recycled waste paper, or the strength of the wallpaper raw material is increased by adding synthetic fiber of chemical synthesis, the requirement of the wallpaper on wood is extremely high consumption, the ratio wallpaper material prepared by recycling waste paper needs to be added with a large amount of chemical raw materials to increase the toughness and the adhesion, so that the wallpaper is not good for environmental protection and human safety, plant fiber such as straw is also used as the wallpaper material at present from the environmental protection angle, pure straw is used as the raw material, because the content of the fiber is insufficient, a large amount of straw needs to be consumed, the input and output ratio is also quite unbalanced, the fiber of the straw is insufficient, and the requirement of the wallpaper is met by adding chemical glue substances, therefore, such wallpaper usually has a strong taste and is not beneficial to human body. The invention aims to improve the application of plant fibers in the wallpaper, increase the fiber material of hemp substances, increase the toughness of the fibers, increase the content of the fibers of wood, maintain the toughness and the polymerization degree of the wallpaper, reduce the use of chemical raw materials and achieve the purpose of real environmental protection.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a plant fiber environment-friendly material and a preparation method thereof, which improve the application of plant fibers in wallpaper, increase the fiber toughness of hemp materials, increase the fiber content of wood, maintain the toughness and polymerization degree of the wallpaper, reduce the use of chemical raw materials and achieve real environment protection.
The purpose of the invention can be realized by the following technical scheme:
a plant fiber environment-friendly material comprises, by mass, 0-60 parts of rice straws, 0-60 parts of corn straws, 0-60 parts of soybean straws, 0-60 parts of wheat straws, 10-20 parts of wood, 20-30 parts of flax fibers, 10-15 parts of a modification auxiliary agent, 10-15 parts of an adhesive and 5-10 parts of a bleaching agent, wherein the modification auxiliary agent comprises calcium stearate, titanium dioxide, tetrabutyl titanate, dicyandiamide, zinc borate and potassium sulfate, the adhesive comprises animal glue, starch, a water-soluble fiber derivative, polyvinyl alcohol, a water-soluble resin and a synthetic resin acrylic latex, and the bleaching agent comprises liquid chlorine, sodium hypochlorite, hydrogen peroxide and sulfamic acid; the preparation method of the plant fiber environment-friendly material comprises the following steps:
step one, pretreating plant fiber raw materials: washing the collected plant fiber raw material in a cleaning pool to remove soil and impurities, and then putting the plant fiber in a drying box to evaporate water, wherein the temperature of the drying box is 70-90 ℃, and the plant fiber reaches an oven-dry state with zero water content;
step two, crushing the plant fiber raw material: putting dry plant fibers on a pulverizer, enabling the plant fibers to enter a pulverizing cavity from the middle of an upper grinding roller and a lower grinding roller, conveying the plant fibers pulverized by a hydraulic cylinder into a powder cavity through the sizes of openings and included angles at the tail ends of the upper grinding roller and the lower grinding roller, conveying plant fiber powder onto a screen mesh through the rotation of a special-shaped disc, and driving the screen mesh to shake back and forth to screen the plant fiber powder;
step three, chemical slurry: placing the crushed plant fiber in a container, adding water, soaking for 0.5 hour, slowly heating, heating from 20 ℃ to 90 ℃ within 20 minutes, adding the modification auxiliary agent and continuously stirring when heating to 50 ℃, and adding the adhesive and continuously stirring when heating for three hours;
step four, washing and separating: carrying out three times of separation on wood pulp and black liquor, wherein the first time of separation is used for integrally separating the wood pulp on the upper layer, the second time of separation is used for separating the black liquor in the interlayer and the black liquor in the interlayer, the third time of separation is used for separating the black liquor in the bottom layer, and the included black liquor is treated to obtain the raw material of the wood pulp;
step five, wood pulp bleaching: the bleaching agent is put into the wood pulp, the order of putting the bleaching agent is that liquid chlorine, sodium hypochlorite, hydrogen peroxide and sulfamic acid are formed, the stirring speed of the liquid chlorine, the sodium hypochlorite, the hydrogen peroxide and the sulfamic acid in the injection process is 15 r/min, the interval time of the liquid chlorine, the sodium hypochlorite, the hydrogen peroxide and the sulfamic acid injection is 2 min, the brightness of bleaching is 60-70%,
step six, pulping and papermaking: and (2) modulating wood pulp in a pulp mixing box, removing impurities with small relative density and large volume in the wood pulp in the pulp mixing box, then feeding the wood pulp onto a papermaking net for papermaking, and controlling the pulp quantity and the concentration by the pulp mixing box to obtain the plant fiber environment-friendly material.
As a further scheme of the invention, in the step one, the washed plant fiber is firstly pressed dry on a press machine before evaporating water in a drying box, the pressure of the press machine is 10MPa, when the plant fiber is processed in the drying box until the water vapor is invisible to the naked eyes, the plant fiber is pressed on the press machine again, the crushed hard part is fully pressed, and finally the plant fiber is placed in the drying box for drying.
As a further scheme of the present invention, in the third step, the modification auxiliary is added to the plant fiber in three batches, the first batch is composed of calcium stearate and titanium dioxide and is added when the plant fiber powder is soaked for 0.5 hour, the second batch is composed of tetrabutyl titanate and dicyandiamide and is added when the first batch of modification auxiliary is added for 5 minutes, the third batch is composed of zinc borate and potassium sulfate and is added when the second batch of modification auxiliary is added for 10 minutes, and the stirring speed of the three batches of modification auxiliary is 30 revolutions per minute.
As a further scheme of the invention, the separation of the step four is completed in three steps, and the specific steps are as follows:
s1, pulping the flour paste: accurately separating the flour pulp from the black liquor and then directly entering the fifth step;
s2, slurry lining and pulping: after separation, the lining pulp is firstly screened by a coarse screen to screen out large particles and substances insoluble in liquid in the pulp, wood pulp is extruded by a pulp extruder, the extruded wood pulp is subjected to thermal dispersion treatment, the dispersed wood pulp is subjected to deinking treatment, deslagging is carried out after membrane removal treatment, and finally fine-grained wood pulp is screened by a fine screen, and the wood pulp is concentrated at the moment, so that the step five can be carried out;
s3, pulping by using core bottom pulp: and (3) separating the core bottom pulp, firstly performing coarse screening and deslagging, performing fine screening to obtain wood pulp after deslagging, concentrating the wood pulp, then feeding the concentrated wood pulp into a pulp extruder, performing thermal dispersion on the wood pulp output by the pulp extruder, and finally pulping the wood pulp and then feeding the pulp into the fifth step.
As a further scheme of the invention, in the fifth step, liquid chlorine with chlorine content of 99.6% is adopted as the liquid chlorine, the injection amount of the liquid chlorine in the pulp is 1 ml per 1000 slurries, the liquid chlorine and sodium react to generate sodium hypochlorite, and the sodium hypochlorite is injected into the slurries, wherein the injection ratio of the sodium hypochlorite is 1: 200, the ratio of hydrogen peroxide injection is 1: 200, the ratio of sulfamic acid injection is 1: 200, diluting with water after bleaching.
As a further scheme of the invention, in the sixth step, the concentration of the paper pulp on the papermaking net is 0.6-1.2%, the dryness of the paper sheet when the paper sheet is taken out of the couch roll is 15-20%, and the dryness of the formed paper is 90-95%.
As a further scheme of the invention, the pulverizer comprises an anti-falling cover, a vibrating screen and a pulverizing cavity, wherein the anti-falling cover is hinged and installed right above the vibrating screen, the hinged position is arranged at one end of the vibrating screen and the anti-falling cover, two side surfaces of the vibrating screen and the anti-falling cover are respectively provided with a telescopic rod, the telescopic rods are used for closing and opening the anti-falling cover on the vibrating screen, the central position of the vibrating screen is provided with a rotating shaft in the direction vertical to the telescopic rods, the rotating shaft is externally connected with a motor and penetrates through a powder cavity of the vibrating screen, two special-shaped discs are installed in the powder cavity and fixed on the rotating shaft, the circular parts of the special-shaped discs are tangent to the frame of a screen, the convex parts of the special-shaped discs are contacted with the screen, an upper grinding roller and a lower grinding roller are installed in the pulverizing cavity through cross rods, the lower grinding roller is horizontally fixed, the opening of the upper grinding roller at one side close to the vibrating screen is smaller than the other side, and a hydraulic cylinder is installed outside the upper grinding roller, the hydraulic cylinder is used for adjusting the size of an opening between the upper rolling roller and the lower rolling roller.
As a further scheme of the invention, the screen adopts a 100-mesh screen.
The invention has the beneficial effects that:
1. the plant fiber environment-friendly material enables plant fibers to have higher polymerization degree after chemical treatment by mixing the agricultural straws and the flax fibers, increases the toughness of wallpaper raw materials, increases the content of cellulose of the plant fibers by increasing the content of wood, avoids the situation that the cellulose content of pure straw fibers is low and the consumption of the plant straws needs to be increased, and reduces the consumption of the raw materials when all the plant fibers meet the use requirements of wallpaper.
2. The press can destroy adhesive colloidal substances in the plants while pressing the water, the cracked plant fibers can be dried more quickly and better, the plant fibers which are repeatedly extruded can extrude the water in the deep layer of the plants, and the crushed stalks can accelerate the evaporation of the water; the modification auxiliary agent is added in batches, so that materials such as non-fiber colloid, lignin and the like in the wood pulp are fully decomposed, the reaction of the modification auxiliary agent is avoided, and the performance of the modification auxiliary agent is fully exerted.
3. The invention utilizes the characteristics of strong toughness of flax fiber and high content of wood fiber through the combination of plant fiber, so that when straw is used as fiber raw material, the defects of insufficient strength and fiber supplement through quantity of straw fiber are avoided, raw materials are saved, and the characteristics of each plant fiber are effectively utilized, thereby achieving the purpose of environmental protection.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the pulverizer of the present invention.
FIG. 2 is a schematic front view of the pulverizer of the present invention.
FIG. 3 is a left side view of the pulverizer of the present invention.
Fig. 4 is a schematic view of the vibrating screen of the present invention.
Reference numerals: 1. a pulverizer; 2. an anti-drop cover; 21. a telescopic rod; 3. vibrating screen; 31. a rotating shaft; 32. a powder chamber; 33. a shaped disc; 4. a grinding chamber; 41. a hydraulic cylinder; 5. rolling the roller; 6. a lower grinding roller; 7. and (4) screening.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An environment-friendly plant fiber material is shown in fig. 1-4, and comprises the following materials, by mass, 20 parts of rice straws, 10 parts of corn straws, 10 parts of soybean straws, 20 parts of wheat straws, 10 parts of wood, 30 parts of flax fibers, 15 parts of a modification auxiliary agent, 10 parts of an adhesive and parts of a bleaching agent, wherein the modification auxiliary agent comprises calcium stearate, titanium dioxide, tetrabutyl titanate, dicyandiamide, zinc borate and potassium sulfate, the adhesive comprises animal glue, starch, a water-soluble fiber derivative, polyvinyl alcohol, a water-soluble resin and a synthetic resin acrylic latex, and the bleaching agent comprises liquid chlorine, sodium hypochlorite, hydrogen peroxide and sulfamic acid; the preparation method of the plant fiber environment-friendly material comprises the following steps:
step one, pretreating plant fiber raw materials: washing the collected plant fiber raw material in a cleaning pool to remove soil and impurities, and then putting the plant fiber in a drying box to evaporate water, wherein the temperature of the drying box is 70-90 ℃, and the plant fiber reaches an oven-dry state with zero water content;
step two, crushing the plant fiber raw material: putting dry plant fibers on a pulverizer 1, enabling the plant fibers to enter a pulverizing cavity 4 from the middle of an upper grinding roller 5 and a lower grinding roller 6, conveying the plant fibers pulverized by a hydraulic cylinder 41 into a powder cavity 32 through the sizes of openings and included angles at the tail ends of the upper grinding roller 5 and the lower grinding roller 6, conveying plant fiber powder onto a screen 7 through rotation of a special-shaped disc 33, and driving the screen 7 to shake back and forth to screen the plant fiber powder by the special-shaped disc 33;
step three, chemical slurry: placing the crushed plant fiber in a container, adding water, soaking for 0.5 hour, slowly heating, heating from 20 ℃ to 90 ℃ within 20 minutes, adding the modification auxiliary agent and continuously stirring when heating to 50 ℃, and adding the adhesive and continuously stirring when heating for three hours;
step four, washing and separating: carrying out three times of separation on wood pulp and black liquor, wherein the first time of separation is used for integrally separating the wood pulp on the upper layer, the second time of separation is used for separating the black liquor in the interlayer and the black liquor in the interlayer, the third time of separation is used for separating the black liquor in the bottom layer, and the included black liquor is treated to obtain the raw material of the wood pulp;
step five, wood pulp bleaching: the bleaching agent is put into the wood pulp, the order of putting the bleaching agent is that liquid chlorine, sodium hypochlorite, hydrogen peroxide and sulfamic acid are formed, the stirring speed of the liquid chlorine, the sodium hypochlorite, the hydrogen peroxide and the sulfamic acid in the injection process is 15 r/min, the interval time of the liquid chlorine, the sodium hypochlorite, the hydrogen peroxide and the sulfamic acid injection is 2 min, the brightness of bleaching is 60-70%,
step six, pulping and papermaking: and (2) modulating wood pulp in a pulp mixing box, removing impurities with small relative density and large volume in the wood pulp in the pulp mixing box, then feeding the wood pulp onto a papermaking net for papermaking, and controlling the pulp quantity and the concentration by the pulp mixing box to obtain the plant fiber environment-friendly material. The mixing of the agricultural straw and the flax fiber enables the plant fiber to have higher polymerization degree after chemical treatment, increases the toughness of the wallpaper raw material, increases the cellulose content of the plant fiber by increasing the wood content, avoids the situation that the consumption of the plant straw needs to be increased due to the fact that the cellulose content of the pure straw fiber is low, and enables the consumption of the raw material to be reduced while the use requirement of the wallpaper is met by the plant fiber.
In the first step, washed plant fibers are firstly pressed and dried on a press machine before water is evaporated in a drying box, the pressure of the press machine is 10MPa, the plant fibers are pressed on the press machine again when the plant fibers are treated in the drying box until water vapor is invisible to naked eyes, the hard parts are fully pressed and crushed, and finally the plant fibers are placed in the drying box and dried; the press can destroy the adhesive colloidal substance in the plant while pressing the water, the cracked plant fiber can be dried faster and better, the plant fiber extruded repeatedly can extrude the water in the deep layer of the plant, and the crushed stem can accelerate the evaporation of the water.
In the third step, the modification auxiliary agent is added into the plant fiber in three batches, the first batch is composed of calcium stearate and titanium dioxide and is added when the plant fiber powder is soaked for 0.5 hour, the second batch is composed of tetrabutyl titanate and dicyanodiamide and is added when the first batch of modification auxiliary agent is added for 5 minutes, the third batch is composed of zinc borate and potassium sulfate and is added when the second batch of modification auxiliary agent is added for 10 minutes, the stirring speed of the modification auxiliary agent added in the three batches is 30 r/min, the modification auxiliary agent is added in batches, so that the materials such as non-fiber colloid, lignin and the like in the wood pulp are fully decomposed, the reaction of the modification auxiliary agent is avoided, and the performance of the modification auxiliary agent is fully exerted.
The separation of the fourth step is completed in three steps, and the specific steps are as follows:
s1, pulping the flour paste: accurately separating the flour pulp from the black liquor and then directly entering the fifth step;
s2, slurry lining and pulping: after separation, the lining pulp is firstly screened by a coarse screen to screen out large particles and substances insoluble in liquid in the pulp, wood pulp is extruded by a pulp extruder, the extruded wood pulp is subjected to thermal dispersion treatment, the dispersed wood pulp is subjected to deinking treatment, deslagging is carried out after membrane removal treatment, and finally fine-grained wood pulp is screened by a fine screen, and the wood pulp is concentrated at the moment, so that the step five can be carried out;
s3, pulping by using core bottom pulp: after separation, the core bottom pulp is firstly subjected to the processes of coarse screening and deslagging, after deslagging, fine screening is carried out to prepare wood pulp, the wood pulp enters a pulp extruder after concentration, the wood pulp output by the pulp extruder is subjected to thermal dispersion, and finally the wood pulp enters the fifth step after pulp grinding;
in the fifth step, liquid chlorine with the chlorine content of 99.6% is adopted as the liquid chlorine, the injection amount of the liquid chlorine in the paper pulp is 1 ml per 1000 pulp, the liquid chlorine and sodium react to generate sodium hypochlorite, and the sodium hypochlorite is injected into the pulp, wherein the injection ratio of the sodium hypochlorite is 1: 200, the ratio of hydrogen peroxide injection is 1: 200, the ratio of sulfamic acid injection is 1: 200, diluting with water after bleaching.
In the sixth step, the concentration of paper pulp on the papermaking net is 0.6-1.2%, the dryness of paper sheet is 15-20% when the paper sheet is taken out of the couch roll, and the dryness of formed paper is 90-95%.
The pulverizer 1 comprises an anti-falling cover 2, a vibrating screen 3 and a pulverizing cavity 4, the anti-falling cover 2 is hinged and installed right above the vibrating screen 3, the hinged position is at one end of the vibrating screen 3 and the anti-falling cover 2, two side faces of the vibrating screen 3 and the anti-falling cover 2 are both provided with telescopic rods 21, the telescopic rods 21 are used for closing and opening the anti-falling cover 2 on the vibrating screen 3, the central position of the vibrating screen 3 is provided with a rotating shaft 31 in the direction perpendicular to the telescopic rods 21, the rotating shaft 31 is externally connected with a motor, the rotating shaft 31 penetrates through a powder cavity 32 of the vibrating screen 3, two special-shaped discs 33 are installed in the powder cavity 32, the special-shaped discs 33 are fixed on the rotating shaft 31, the circular part of each special-shaped disc 33 is tangent to the frame of a screen 7, the convex part of each special-shaped disc 33 is in contact with the screen 7, an upper grinding roller 5 and a lower grinding roller 6 are installed in the pulverizing cavity 4 through cross rods, the lower grinding roller 6 is horizontally fixed, one side opening of the upper grinding roller 5 close to the vibrating screen 3 is smaller than the other side, a hydraulic cylinder 41 is installed on the outer side of the upper rolling roller 5, and the hydraulic cylinder 41 is used for adjusting the size of an opening between the upper rolling roller 5 and the lower rolling roller 6.
The screen 7 is selected from 100 meshes.
Example 2
Example 2 differs from example 1 in that the straw used is all rice straw, a plant fiber environment-friendly material comprises the following materials, by mass, 60 parts of rice straw, 20 parts of wood, 20 parts of flax fiber, 15 parts of modification auxiliary agent, 15 parts of adhesive and 10 parts of bleaching agent, wherein the modification auxiliary agent comprises calcium stearate, titanium dioxide, tetrabutyl titanate, dicyanodiamide, zinc borate and potassium sulfate, the adhesive comprises animal glue, starch, water-soluble fiber derivative, polyvinyl alcohol, water-soluble resin and synthetic resin acrylic latex, and the bleaching agent comprises liquid chlorine, sodium hypochlorite, hydrogen peroxide and sulfamic acid
Example 3
Example 3 is different from example 1 in that the straws used in the method are all corn straws, and the plant fiber environment-friendly material comprises, by mass, 60 parts of corn straws, 15 parts of wood, 20 parts of flax fibers, 10 parts of a modification aid, 15 parts of an adhesive and 10 parts of a bleaching agent, wherein the modification aid comprises calcium stearate, titanium dioxide, tetrabutyl titanate, dicyandiamide, zinc borate and potassium sulfate, the adhesive comprises animal glue, starch, a water-soluble fiber derivative, polyvinyl alcohol, a water-soluble resin and a synthetic resin acrylic latex, and the bleaching agent comprises liquid chlorine, sodium hypochlorite, hydrogen peroxide and sulfamic acid.
Example 4
Real-time example 4 is different from example 1 in that all straws used in the method are soybean straws, and the plant fiber environment-friendly material comprises the following materials, by mass, 60 parts of soybean straws, 10 parts of wood, 25 parts of flax fibers, 12 parts of modification aids, 10 parts of adhesives and 8 parts of bleaching agents, wherein the modification aids comprise calcium stearate, titanium dioxide, tetrabutyl titanate, dicyandiamide, zinc borate and potassium sulfate, the adhesives comprise animal glue, starch, water-soluble fiber derivatives, polyvinyl alcohol, water-soluble resin and synthetic resin acrylic latex, and the bleaching agents comprise liquid chlorine, sodium hypochlorite, hydrogen peroxide and sulfamic acid.
Example 5
Example 5 is different from example 1 in that all straws used are wheat straws, and a plant fiber environment-friendly material, as shown in fig. 1 to 4, comprises, by mass, 60 parts of wheat straws, 20 parts of wood, 30 parts of flax fibers, 10 parts of a modification aid, 15 parts of an adhesive, and 10 parts of a bleaching agent, wherein the modification aid comprises calcium stearate, titanium dioxide, tetrabutyl titanate, dicyandiamide, zinc borate, and potassium sulfate, the adhesive comprises animal glue, starch, a water-soluble fiber derivative, polyvinyl alcohol, a water-soluble resin, and a synthetic resin acrylic latex, and the bleaching agent comprises liquid chlorine, sodium hypochlorite, hydrogen peroxide, and sulfamic acid.
Comparative example 1
Widely used non-woven synthetic fiber wallpaper materials are available on the market, wherein the synthetic fiber accounts for 5% of the total fiber amount, and basically accounts for about 10%.
According to the national requirements GB/T348442017 for wallpaper raw materials, the mildew resistance, the elasticity and the wet tensile strength of the wallpaper raw materials are compared, and the specific data are shown in the following table:
as can be seen from the above table, examples 1 to 5 of the present application and comparative example 1 each had a grade 0 mold resistance;
longitudinal elasticity of examples 1 to 5 is slightly lower than that of comparative example 1, and transverse elasticity is less than or equal to 1.8% of national standard of pure plant fiber materials of examples 1 to 5, the examples of the application reach 1.4%, and transverse elasticity is less than or equal to 1.5% of national standard of comparative example 1 containing synthetic fibers, so that the transverse elasticity of the ratio raw material added with flax fibers is close to the national standard of the synthetic fibers;
the national standards for wet tensile strength in the machine direction were 0.7kN/m or more, and the wet tensile strengths of examples 1 to 5 were 1.0kN/m or more, but the strengths of 1.3kN/m or more from the synthetic fiber were slightly inferior, and the national standards for wet tensile strength in the transverse direction were 0.5kN/m or more, and the transverse strengths of examples 1 to 5 were 0.8kN/m or more, and were already close to comparative example 1.
In summary, in the examples 1 to 5, after the plant fiber is mixed and added, the flax fiber has the performance similar to that of the raw material of the non-woven wallpaper through the toughness of the flax fiber, and is a purely natural plant material without toxic chemical substances, so that the plant fiber material is a practical environment-friendly material.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (6)
1. A plant fiber environment-friendly material is characterized by comprising, by mass, 20-60 parts of rice straws, 10-60 parts of corn straws, 10-60 parts of soybean straws, 20-60 parts of wheat straws, 10-20 parts of wood, 20-30 parts of flax fibers, 10-15 parts of modification aids, 10-15 parts of adhesives and 5-10 parts of bleaching agents, wherein the modification aids comprise calcium stearate, titanium dioxide, tetrabutyl titanate, dicyanodiamide, zinc borate and potassium sulfate, the adhesives comprise animal glue, starch, water-soluble fiber derivatives, polyvinyl alcohol, water-soluble resin and synthetic resin acrylic latex, and the bleaching agents comprise liquid chlorine, sodium hypochlorite, hydrogen peroxide and sulfamic acid; the preparation method of the plant fiber environment-friendly material comprises the following steps:
step one, pretreating plant fiber raw materials: washing the collected plant fiber raw material in a cleaning pool to remove soil and impurities, and then putting the plant fiber in a drying box to evaporate water, wherein the temperature of the drying box is 70-90 ℃, and the plant fiber reaches an oven-dry state with zero water content;
step two, crushing the plant fiber raw material: putting dry plant fibers on a pulverizer (1), enabling the plant fibers to enter a pulverizing cavity (4) from the middle of an upper grinding roller (5) and a lower grinding roller (6), conveying the plant fibers pulverized by a hydraulic cylinder (41) into a powder cavity (32) according to the sizes of openings and included angles at the tail ends of the upper grinding roller (5) and the lower grinding roller (6), conveying plant fiber powder onto a screen (7) through the rotation of a special-shaped disc (33), and driving the screen (7) to shake back and forth to screen the plant fiber powder by the special-shaped disc (33);
step three, chemical slurry: placing the crushed plant fiber in a container, adding water, soaking for 0.5 hour, slowly heating, heating from 20 ℃ to 90 ℃ within 20 minutes, adding the modification auxiliary agent and continuously stirring when heating to 50 ℃, and adding the adhesive and continuously stirring when heating for three hours;
step four, washing and separating: carrying out three times of separation on wood pulp and black liquor, wherein the first time of separation is used for integrally separating the wood pulp on the upper layer, the second time of separation is used for separating the black liquor in the interlayer and the black liquor in the interlayer, the third time of separation is used for separating the black liquor in the bottom layer, and the included black liquor is treated to obtain the raw material of the wood pulp;
step five, wood pulp bleaching: adding a bleaching agent into wood pulp, wherein the order of adding the bleaching agent is liquid chlorine, sodium hypochlorite, hydrogen peroxide and sulfamic acid, the stirring speed of the liquid chlorine, the sodium hypochlorite, the hydrogen peroxide and the sulfamic acid in the injection process is 15 r/min, the interval time of injecting the liquid chlorine, the sodium hypochlorite, the hydrogen peroxide and the sulfamic acid is 2 min, and the brightness of bleaching is 60-70%;
step six, pulping and papermaking: modulating wood pulp in a pulp mixing box, removing impurities with small relative density and large volume in the wood pulp in the pulp mixing box, then feeding the impurities onto a papermaking net for papermaking, and controlling the pulp quantity and the concentration in the pulp mixing box to prepare the plant fiber environment-friendly material;
in the first step, washed plant fibers are firstly pressed and dried on a press machine before water is evaporated in a drying box, the pressure of the press machine is 10MPa, the plant fibers are pressed on the press machine again when the plant fibers are treated in the drying box until water vapor is invisible to naked eyes, the hard parts are fully pressed and crushed, and finally the plant fibers are placed in the drying box and dried;
in the third step, the modification auxiliary agent is added into the plant fiber in three batches, the first batch is composed of calcium stearate and titanium dioxide and is added when the plant fiber powder is soaked for 0.5 hour, the second batch is composed of tetrabutyl titanate and dicyanodiamide and is added when the first batch of modification auxiliary agent is added for 5 minutes, the third batch is composed of zinc borate and potassium sulfate and is added when the second batch of modification auxiliary agent is added for 10 minutes, and the stirring speed of the modification auxiliary agent added in the three batches is 30 revolutions per minute.
2. The plant fiber environment-friendly material as claimed in claim 1, wherein the separation of the fourth step is completed in three steps, and the specific steps are as follows:
s1, pulping the flour paste: accurately separating the flour pulp from the black liquor and then directly entering the fifth step;
s2, slurry lining and pulping: after separation, the lining pulp is firstly screened by a coarse screen to screen out large particles and substances insoluble in liquid in the pulp, wood pulp is extruded by a pulp extruder, the extruded wood pulp is subjected to thermal dispersion treatment, the dispersed wood pulp is subjected to deinking treatment, deslagging is carried out after the deinking treatment, and finally, fine-grained wood pulp is screened by a fine screen, and the wood pulp is concentrated at the moment, so that the step five can be carried out;
s3, pulping by using core bottom pulp: and (3) separating the core bottom pulp, firstly performing coarse screening and deslagging, performing fine screening to obtain wood pulp after deslagging, concentrating the wood pulp, then feeding the concentrated wood pulp into a pulp extruder, performing thermal dispersion on the wood pulp output by the pulp extruder, and finally pulping the wood pulp and then feeding the pulp into the fifth step.
3. The plant fiber environment-friendly material as claimed in claim 1, wherein in the step five, liquid chlorine with a chlorine content of 99.6% is adopted as the liquid chlorine, the injection amount of the liquid chlorine in the pulp is 1 ml per 1000 pulp, the liquid chlorine and sodium react to generate sodium hypochlorite, and the sodium hypochlorite is injected into the pulp, and the injection ratio of the sodium hypochlorite is 1: 200, the ratio of hydrogen peroxide injection is 1: 200, the ratio of sulfamic acid injection is 1: 200, diluting with water after bleaching.
4. The plant fiber environment-friendly material as claimed in claim 1, wherein in the sixth step, the concentration of paper pulp on the papermaking net is 0.6-1.2%, the dryness of paper sheet when the paper sheet is taken out of a couch roll is 15-20%, and the dryness of formed paper is 90-95%.
5. A plant fiber environment-friendly material according to claim 1, wherein the pulverizer (1) comprises an anti-drop cover (2), a vibrating screen (3) and a pulverizing cavity (4), the anti-drop cover (2) is hinged and installed right above the vibrating screen (3), the hinged position is at one end of the vibrating screen (3) and one end of the anti-drop cover (2), two side faces of the vibrating screen (3) and the anti-drop cover (2) are respectively provided with a telescopic rod (21), the telescopic rods (21) are used for closing and opening the anti-drop cover (2) on the vibrating screen (3), a rotating shaft (31) is installed at the central position of the vibrating screen (3) in a direction perpendicular to the telescopic rods (21), the rotating shaft (31) is externally connected with a motor, the rotating shaft (31) passes through a powder cavity (32) of the vibrating screen (3), two special-shaped discs (33) are installed in the powder cavity (32), and the special-shaped discs (33) are fixed on the rotating shaft (31), the circular part of dysmorphism dish (33) is tangent with the frame of screen cloth (7), the bulge and the screen cloth (7) contact of dysmorphism dish (33), go up to roll roller (5) and roll roller (6) down and install the inside at crushing chamber (4) through the horizontal pole, roll roller (6) down the level is fixed, it is less than the opposite side to roll roller (5) on being close to the one side opening of reciprocating sieve (3), go up to roll roller (5) outside and install pneumatic cylinder (41), pneumatic cylinder (41) are used for adjusting the opening size between roll roller (5) and roll roller (6) down.
6. The plant fiber environment-friendly material as claimed in claim 1, wherein the screen (7) is selected from 100 mesh.
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| CA3102538A1 (en) * | 2020-12-11 | 2022-06-11 | Sixring Inc. | Use of a 2 liquid phase system in biomass delignification |
| CN115726186A (en) * | 2021-08-31 | 2023-03-03 | 山东双圆生物科技有限公司 | Waste cloth decolorizing agent containing biological enzyme, preparation method, treating agent and application |
| CN116144289B (en) * | 2023-02-07 | 2024-05-10 | 大连工业大学 | Biological aldehyde group modified polyvinyl alcohol adhesive and application thereof in preparation of medium-density chipboard |
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