CN108060604B - Process for processing corrugated paper by using waste paper and coconut coir - Google Patents
Process for processing corrugated paper by using waste paper and coconut coir Download PDFInfo
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- CN108060604B CN108060604B CN201711286427.2A CN201711286427A CN108060604B CN 108060604 B CN108060604 B CN 108060604B CN 201711286427 A CN201711286427 A CN 201711286427A CN 108060604 B CN108060604 B CN 108060604B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/02—Material of vegetable origin
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
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Abstract
The invention discloses a process for processing corrugated paper by using waste paper and coconut chaff, which relates to the technical field of corrugated paper processing and comprises the following steps: (1) coconut husk dehydration, (2) pulping, (3) dehydration, and (4) drying. The coconut husk powder is used as a main auxiliary material, so that the using amount of waste paper during corrugated paper processing is reduced, the novel application of the coconut husk in the field of corrugated paper processing is realized, and the application field of the coconut husk is not limited to gardening media any more; the two-step pulping operation is carried out, the waste paper powder, the coconut bran powder and the plant starch are utilized to prepare the uniform slurry for corrugated paper processing, the corrugated paper is prepared through the subsequent conventional operation, the prepared corrugated paper has the packing performance which is comparable to that of the conventional corrugated paper, and the corrugated paper can be widely applied to the packing of various products.
Description
The technical field is as follows:
the invention relates to the technical field of corrugated paper processing, in particular to a process for processing corrugated paper by using waste paper and coconut chaff.
Background art:
corrugated containers are an excellent packaging material, and are favored in modern society because they have mechanical properties such as light weight, puncture resistance, shock resistance, and easiness in processing and molding, and also have advantages such as good suitability for decoration and printing, recycling, and no environmental pollution. The application range is wider and wider, and the development speed is faster and faster. At present, corrugated paper is mostly made of waste paper, reasonable recycling of the waste paper is achieved, but waste paper resources are still limited, and the problem of wood consumption cannot be fundamentally reduced.
Coconut chaff, which is coconut husk fiber powder, is a coconut byproduct or waste after processing, and is a pure natural organic matter medium dropped from the processing process of coconut husk fiber. The processed coconut coir is very suitable for cultivating plants and is a popular gardening medium at present.
In order to use new application of coconut chaff in the field of corrugated paper processing, a process for processing corrugated paper by using waste paper and coconut chaff is developed on the basis of research for many years, the consumption of the waste paper is reduced by adding the coconut chaff, the prepared corrugated paper meets the requirement of conventional packaging, and meanwhile, the corrugated paper can be recycled.
The invention content is as follows:
the technical problem to be solved by the invention is to provide a process for processing corrugated paper by using waste paper and coconut husk, which can ensure that the manufactured corrugated paper meets the conventional packaging requirements on the basis of reducing the consumption of the waste paper.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a process for processing corrugated paper by using waste paper and coconut coir comprises the following steps:
(1) and (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 60-80 mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 80-100 meshes by a crusher, adding the waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding coconut husk powder and plant starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and removing slag by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
The mass ratio of the waste paper powder to the coconut husk powder to the plant starch is 10-15:1-5: 0.1-0.5.
The plant starch is selected from one of corn starch, wheat starch, potato starch, sweet potato starch and rice starch.
The motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min.
The motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min.
The press section pressure was 800 kN/m.
The modified coconut bran powder is prepared by modifying the coconut bran powder, and the modification method comprises the following steps: adding self-crosslinking acrylic resin and trimethylolpropane triglycidyl ether into coconut husk powder, heating to 120-130 ℃ at a heating rate of 5 ℃/min, keeping the temperature, stirring for 2-4 h, adding hydrolyzed polymaleic anhydride and vulcanized lard, keeping the temperature, stirring for 0.5-1 h at 120-130 ℃, cooling the obtained mixture to-10- -5 ℃ at a cooling rate of 5 ℃/min, keeping the temperature, standing for 3-5 h, and finally preparing into 60-80-mesh powder by a pulverizer to obtain the modified coconut husk powder.
The mass ratio of the coconut bran powder to the self-crosslinking acrylic resin to the trimethylolpropane triglycidyl ether to the hydrolyzed polymaleic anhydride to the vulcanized lard is 100:5-10:1-5:0.5-3: 0.5-3.
The preparation method of the self-crosslinking acrylic resin comprises the following steps: firstly, dissolving polyoxyethylene lauryl ether in deionized water, heating to 50-60 ℃, preserving heat and stirring, then adding N-hydroxymethyl acrylamide, zinc methacrylate and diacetone acrylamide, continuing to preserve heat and stir for 20-35 min at 50-60 ℃, then adding 10 wt% of potassium persulfate aqueous solution, heating to a reflux state, preserving heat and stirring for 2-5 h, carrying out reduced pressure concentration on the obtained mixture to prepare an extract with the water content of 15-25 wt%, naturally cooling the obtained extract to below 35 ℃, sending the extract into a freeze dryer, drying the obtained solid, and preparing the solid into micropowder by using an ultrafine pulverizer to obtain the self-crosslinking acrylic resin.
The mass ratio of the lauryl alcohol polyoxyethylene ether to the deionized water to the N-hydroxymethyl acrylamide to the zinc methacrylate to the diacetone acrylamide to the 10 wt% potassium persulfate aqueous solution is 0.5-2:30-50:1-5:5-10:0.5-2: 1-5.
The self-crosslinking acrylic resin is used as a main modifier, the specific network structure of the self-crosslinking acrylic resin is utilized, and the auxiliary modifiers trimethylolpropane triglycidyl ether, hydrolytic polymaleic anhydride and lard sulfide are cooperated to obviously improve the interface compatibility between the coconut coir and the paper powder, promote the uniform dispersion of the coconut coir and the paper powder in water to form uniform slurry, and ensure the mechanical property of the prepared corrugated paper while reducing the use amount of the paper powder.
The invention has the beneficial effects that:
(1) the coconut husk powder is used as a main auxiliary material, so that the using amount of waste paper during corrugated paper processing is reduced, the novel application of the coconut husk in the field of corrugated paper processing is realized, and the application field of the coconut husk is not limited to gardening media any more;
(2) the invention adopts two pulping steps, uses waste paper powder, coconut bran powder and plant starch to prepare uniform slurry for corrugated paper processing, and prepares corrugated paper through subsequent conventional operation, the prepared corrugated paper has packing performance comparable to that of the conventional corrugated paper, and can be widely applied to packing of various products.
The specific implementation mode is as follows:
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
(1) And (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 80-mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 100 meshes by a crusher, adding 10kg of waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding 2kg of coconut bran powder and 0.1kg of sweet potato starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and finally removing slag materials by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
Wherein the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min; the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min; the press section pressure was 800 kN/m.
Example 2
(1) And (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 80-mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 100 meshes by a crusher, adding 15kg of waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding 3kg of coconut bran powder and 0.2kg of sweet potato starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and finally removing slag materials by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
Wherein the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min; the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min; the press section pressure was 800 kN/m.
Example 3
(1) And (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 80-mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 100 meshes by a crusher, adding 15kg of waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding 3kg of modified coconut bran powder and 0.2kg of sweet potato starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and finally removing slag materials by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
Wherein the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min; the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min; the press section pressure was 800 kN/m.
Preparing modified coconut husk: adding 5g of self-crosslinking acrylic resin and 1g of trimethylolpropane triglycidyl ether into 100g of coconut coir powder, heating to 120-130 ℃ at the heating rate of 5 ℃/min, keeping the temperature and stirring for 3h, then adding 0.5g of hydrolyzed polymaleic anhydride and 0.5g of vulcanized lard, keeping the temperature and stirring for 1h at 120-130 ℃, cooling the obtained mixture to-10 to-5 ℃ at the cooling rate of 5 ℃/min, keeping the temperature and standing for 5h, and finally preparing the mixture into 80-mesh powder by a pulverizer to obtain the modified coconut coir.
Preparation of self-crosslinking acrylic resin: firstly, 0.5g of polyoxyethylene lauryl ether is dissolved in 50g of deionized water, the mixture is heated to 50-60 ℃ and is stirred under heat preservation, then 3g N-hydroxymethyl acrylamide, 10g of zinc methacrylate and 0.5g of diacetone acrylamide are added, the mixture is continuously stirred under heat preservation for 30min under 50-60 ℃, then 5g of 10 wt% potassium persulfate aqueous solution is added, the mixture is heated to a reflux state and is stirred under heat preservation for 2h, the obtained mixture is concentrated under reduced pressure to obtain an extract with the water content of 15-25 wt%, the obtained extract is naturally cooled to below 35 ℃ and is sent into a freeze dryer, and the obtained solid is dried to be made into micro powder through an ultra-micro pulverizer, so that the self-crosslinking acrylic resin is obtained.
Example 4
(1) And (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 80-mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 100 meshes by a crusher, adding 15kg of waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding 3kg of modified coconut bran powder and 0.2kg of sweet potato starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and finally removing slag materials by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
Wherein the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min; the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min; the press section pressure was 800 kN/m.
Preparing modified coconut husk: adding 8g of self-crosslinking acrylic resin and 1g of trimethylolpropane triglycidyl ether into 100g of coconut coir powder, heating to 120-130 ℃ at a heating rate of 5 ℃/min, keeping the temperature and stirring for 3h, then adding 0.5g of hydrolyzed polymaleic anhydride and 0.5g of vulcanized lard, keeping the temperature and stirring for 1h at 120-130 ℃, cooling the obtained mixture to-10 to-5 ℃ at a cooling rate of 5 ℃/min, keeping the temperature and standing for 5h, and finally preparing the mixture into 80-mesh powder by a pulverizer to obtain the modified coconut coir.
Preparation of self-crosslinking acrylic resin: firstly dissolving 1g of polyoxyethylene lauryl ether in 50g of deionized water, heating to 50-60 ℃, keeping the temperature and stirring, then adding 5g N-hydroxymethyl acrylamide, 10g of zinc methacrylate and 1g of diacetone acrylamide, continuing to keep the temperature and stirring at 50-60 ℃ for 30min, then adding 5g of 10 wt% potassium persulfate aqueous solution, heating to a reflux state, keeping the temperature and stirring for 3h, carrying out reduced pressure concentration on the obtained mixture to prepare an extract with the water content of 15-25 wt%, naturally cooling the obtained extract to below 35 ℃, sending the extract into a freeze dryer, drying the obtained solid, and preparing the solid into micropowder by using an ultrafine pulverizer, thus obtaining the self-crosslinking acrylic resin.
Comparative example 1
(1) And (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 80-mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 100 meshes by a crusher, adding 15kg of waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding 3kg of modified coconut bran powder and 0.2kg of sweet potato starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and finally removing slag materials by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
Wherein the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min; the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min; the press section pressure was 800 kN/m.
Preparing modified coconut husk: adding 8g of self-crosslinking acrylic resin and 1g of trimethylolpropane triglycidyl ether into 100g of coconut coir powder, heating to 120-130 ℃ at a heating rate of 5 ℃/min, keeping the temperature and stirring for 3h, then adding 0.5g of hydrolyzed polymaleic anhydride, keeping the temperature and stirring for 1h at 120-130 ℃, cooling the obtained mixture to-10- -5 ℃ at a cooling rate of 5 ℃/min, keeping the temperature and standing for 5h, and finally preparing into 80-mesh powder by a pulverizer to obtain the modified coconut coir.
Preparation of self-crosslinking acrylic resin: firstly dissolving 1g of polyoxyethylene lauryl ether in 50g of deionized water, heating to 50-60 ℃, keeping the temperature and stirring, then adding 5g N-hydroxymethyl acrylamide, 10g of zinc methacrylate and 1g of diacetone acrylamide, continuing to keep the temperature and stirring at 50-60 ℃ for 30min, then adding 5g of 10 wt% potassium persulfate aqueous solution, heating to a reflux state, keeping the temperature and stirring for 3h, carrying out reduced pressure concentration on the obtained mixture to prepare an extract with the water content of 15-25 wt%, naturally cooling the obtained extract to below 35 ℃, sending the extract into a freeze dryer, drying the obtained solid, and preparing the solid into micropowder by using an ultrafine pulverizer, thus obtaining the self-crosslinking acrylic resin.
Comparative example 2
(1) And (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 80-mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 100 meshes by a crusher, adding 15kg of waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding 3kg of modified coconut bran powder and 0.2kg of sweet potato starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and finally removing slag materials by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
Wherein the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min; the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min; the press section pressure was 800 kN/m.
Preparing modified coconut husk: adding 8g of self-crosslinking acrylic resin and 1g of trimethylolpropane triglycidyl ether into 100g of coconut coir powder, heating to 120-130 ℃ at a heating rate of 5 ℃/min, keeping the temperature, stirring for 3h, adding 0.5g of vulcanized lard, keeping the temperature, stirring for 1h at 120-130 ℃, cooling the obtained mixture to-10-5 ℃ at a cooling rate of 5 ℃/min, keeping the temperature, standing for 5h, and finally preparing into 80-mesh powder by a pulverizer to obtain the modified coconut coir.
Preparation of self-crosslinking acrylic resin: firstly dissolving 1g of polyoxyethylene lauryl ether in 50g of deionized water, heating to 50-60 ℃, keeping the temperature and stirring, then adding 5g N-hydroxymethyl acrylamide, 10g of zinc methacrylate and 1g of diacetone acrylamide, continuing to keep the temperature and stirring at 50-60 ℃ for 30min, then adding 5g of 10 wt% potassium persulfate aqueous solution, heating to a reflux state, keeping the temperature and stirring for 3h, carrying out reduced pressure concentration on the obtained mixture to prepare an extract with the water content of 15-25 wt%, naturally cooling the obtained extract to below 35 ℃, sending the extract into a freeze dryer, drying the obtained solid, and preparing the solid into micropowder by using an ultrafine pulverizer, thus obtaining the self-crosslinking acrylic resin.
Comparative example 3
(1) And (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 80-mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 100 meshes by a crusher, adding 15kg of waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding 3kg of modified coconut bran powder and 0.2kg of sweet potato starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and finally removing slag materials by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
Wherein the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min; the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min; the press section pressure was 800 kN/m.
Preparing modified coconut husk: adding 8g of self-crosslinking acrylic resin into 100g of coconut coir powder, heating to 120-130 ℃ at a heating rate of 5 ℃/min, keeping the temperature and stirring for 3h, then adding 0.5g of hydrolyzed polymaleic anhydride and 0.5g of vulcanized lard, keeping the temperature and stirring for 1h at 120-130 ℃, cooling the obtained mixture to-10- -5 ℃ at a cooling rate of 5 ℃/min, keeping the temperature and standing for 5h, and finally preparing into 80-mesh powder by a pulverizer to obtain the modified coconut coir.
Preparation of self-crosslinking acrylic resin: firstly dissolving 1g of polyoxyethylene lauryl ether in 50g of deionized water, heating to 50-60 ℃, keeping the temperature and stirring, then adding 5g N-hydroxymethyl acrylamide, 10g of zinc methacrylate and 1g of diacetone acrylamide, continuing to keep the temperature and stirring at 50-60 ℃ for 30min, then adding 5g of 10 wt% potassium persulfate aqueous solution, heating to a reflux state, keeping the temperature and stirring for 3h, carrying out reduced pressure concentration on the obtained mixture to prepare an extract with the water content of 15-25 wt%, naturally cooling the obtained extract to below 35 ℃, sending the extract into a freeze dryer, drying the obtained solid, and preparing the solid into micropowder by using an ultrafine pulverizer, thus obtaining the self-crosslinking acrylic resin.
Comparative example 4
(1) And (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 80-mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 100 meshes by a crusher, adding 15kg of waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding 3kg of modified coconut bran powder and 0.2kg of sweet potato starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and finally removing slag materials by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
Wherein the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min; the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min; the press section pressure was 800 kN/m.
Preparing modified coconut husk: adding 8g of self-crosslinking acrylic resin and 1g of trimethylolpropane triglycidyl ether into 100g of coconut coir powder, heating to 120-130 ℃ at a heating rate of 5 ℃/min, keeping the temperature and stirring for 3h, then adding 0.5g of hydrolyzed polymaleic anhydride and 0.5g of vulcanized lard, keeping the temperature and stirring for 1h at 120-130 ℃, cooling the obtained mixture to-10 to-5 ℃ at a cooling rate of 5 ℃/min, keeping the temperature and standing for 5h, and finally preparing the mixture into 80-mesh powder by a pulverizer to obtain the modified coconut coir.
Preparation of self-crosslinking acrylic resin: firstly dissolving 1g of polyoxyethylene lauryl ether in 50g of deionized water, heating to 50-60 ℃, keeping the temperature and stirring, then adding 5g of acrylic acid, 10g of methyl methacrylate and 1g of diacetone acrylamide, continuing to keep the temperature and stirring at 50-60 ℃ for 30min, then adding 5g of 10 wt% potassium persulfate aqueous solution, heating to a reflux state, keeping the temperature and stirring for 3h, concentrating the obtained mixture under reduced pressure to prepare an extract with the water content of 15-25 wt%, naturally cooling the obtained extract to below 35 ℃, sending the extract into a freeze dryer, drying the obtained solid, and preparing the solid into micropowder by an ultrafine pulverizer, thus obtaining the self-crosslinking acrylic resin.
Comparative example 5
(1) And (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 80-mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 100 meshes by a crusher, adding 18.2kg of waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to obtain uniform paper pulp, adding the obtained pulp into a pulping machine, grinding the pulp which is not crushed by the pulping machine, and finally removing slag by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: and conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain the finished corrugated paper.
Wherein the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min; the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min; the press section pressure was 800 kN/m.
Example 5
Corrugated paper of the same specification was prepared by using the same waste paper, coconut husk and sweet potato starch as raw materials and processed according to examples 1 to 4 and comparative examples 1 to 5, respectively, and the performance of the corrugated paper was measured, and the results are shown in table 1.
TABLE 1 performance properties of corrugated paper made according to the invention
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A process for processing corrugated paper by using waste paper and coconut coir is characterized by comprising the following steps:
(1) and (3) coconut husk dehydration: placing the coconut coir in an oven at the constant temperature of 55-65 ℃ for dehydration to reduce the water content of the coconut coir to below 3 wt%, and preparing the coconut coir into 60-80 mesh coconut coir powder by a pulverizer;
(2) pulping: making waste paper into waste paper powder of 80-100 meshes by a crusher, adding the waste paper powder into a pulping machine, injecting water into the pulping machine, fully pulping to prepare uniform paper pulp, adding coconut husk powder and plant starch, continuously pulping to prepare uniform slurry, adding the obtained slurry into a pulping machine, grinding the slurry which is not smashed by the pulping machine, and removing slag by a slag remover;
(3) and (3) dehydrating: pumping the prepared slurry to a net part for forming and dewatering until the dryness reaches 15-25%, and conveying the formed slurry to a press part for dewatering until the dryness reaches 40-50%;
(4) drying: conveying the squeezed pulp to a drying part, and drying until the dryness reaches 90-95% to obtain finished corrugated paper;
the modified coconut bran powder is prepared by modifying the coconut bran powder, and the modification method comprises the following steps: adding self-crosslinking acrylic resin and trimethylolpropane triglycidyl ether into coconut husk powder, heating to 120-130 ℃ at a heating rate of 5 ℃/min, keeping the temperature, stirring for 2-4 h, adding hydrolyzed polymaleic anhydride and vulcanized lard, keeping the temperature, stirring for 0.5-1 h at 120-130 ℃, cooling the obtained mixture to-10- -5 ℃ at a cooling rate of 5 ℃/min, keeping the temperature, standing for 3-5 h, and finally preparing into 60-80-mesh powder by a pulverizer to obtain modified coconut husk powder;
the mass ratio of the coconut bran powder to the self-crosslinking acrylic resin to the trimethylolpropane triglycidyl ether to the hydrolyzed polymaleic anhydride to the vulcanized lard is 100:5-10:1-5:0.5-3: 0.5-3.
2. The process for processing corrugated paper by using waste paper and coconut coir as claimed in claim 1, wherein the process comprises the following steps: the mass ratio of the waste paper powder to the coconut husk powder to the plant starch is 10-15:1-5: 0.1-0.5.
3. The process for processing corrugated paper by using waste paper and coconut coir as claimed in claim 1, wherein the process comprises the following steps: the plant starch is selected from one of corn starch, wheat starch, potato starch, sweet potato starch and rice starch.
4. The process for processing corrugated paper by using waste paper and coconut coir as claimed in claim 1, wherein the process comprises the following steps: the motor power of the beater is 1.1kW, and the rotating speed is 1400 r/min.
5. The process for processing corrugated paper by using waste paper and coconut coir as claimed in claim 1, wherein the process comprises the following steps: the motor power of the pulping machine is 1.5kW, and the rotating speed is 1480 r/min.
6. The process for processing corrugated paper by using waste paper and coconut coir as claimed in claim 1, wherein the process comprises the following steps: the press section pressure was 800 kN/m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1995538A (en) * | 2006-12-30 | 2007-07-11 | 罗晓容 | Preparation method of corrugated paper by adding queensland arrowroot slag in waste paper board |
| CN102191726A (en) * | 2011-03-31 | 2011-09-21 | 广东理文造纸有限公司 | Process for preparing low-basis-weight corrugated paper |
| CN103321088A (en) * | 2013-07-19 | 2013-09-25 | 吉安集团股份有限公司 | Renewable high-strength corrugated medium and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1995538A (en) * | 2006-12-30 | 2007-07-11 | 罗晓容 | Preparation method of corrugated paper by adding queensland arrowroot slag in waste paper board |
| CN102191726A (en) * | 2011-03-31 | 2011-09-21 | 广东理文造纸有限公司 | Process for preparing low-basis-weight corrugated paper |
| CN103321088A (en) * | 2013-07-19 | 2013-09-25 | 吉安集团股份有限公司 | Renewable high-strength corrugated medium and its production method |
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