CN110499675B - Biomass oil-proof agent for paper pulp mold and production process thereof - Google Patents
Biomass oil-proof agent for paper pulp mold and production process thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
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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
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/18—Highly hydrated, swollen or fibrillatable 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/13—Silicon-containing compounds
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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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
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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
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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
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/53—Polyethers; Polyesters
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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
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
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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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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Abstract
The invention provides a biomass oil-proof agent for a paper pulp mould and a production process thereof, wherein the production process comprises the steps of synthesizing potato starch into molasses under the action of alpha-amylase and glucoamylase, fermenting the molasses through a special process to obtain lactic acid, extruding and polymerizing the lactic acid into polylactic acid through an intermittent stirring reactor and a double-screw extruder, and preparing a negative biomass oil-proof agent from 40-60 parts by weight of the polylactic acid, 10-15 parts by weight of nano-cellulose, 5-12 parts by weight of polycaprolactone, 1-6 parts by weight of trimethylolpropane triester and 1-3 parts by weight of a silane coupling agent. The biomass oil-proof agent can be directly added into positive paper pulp with the concentration of 0.3 percent for low-speed stirring, the biomass oil-proof agent with negative and the positive paper pulp fibers are wrapped and combined, and the phenomenon that the fibers repel hot oil of food at 100 ℃ under the action of high pressure of 40-60T and high temperature of 190-200 ℃ through a product heat setting die is changed, the hot oil does not leak, and the oil-proof effect is achieved.
Description
Technical Field
The invention relates to the technical field of water and oil proofing agents for paper pulp moulds, in particular to a biomass oil proofing agent for paper pulp moulds and a production process thereof.
Background
Polylactic acid can be produced from biomass resources such as plant starch, and thus is large in industrial scale; polylactic acid is biodegradable and is ultimately broken down into carbon dioxide and water in the environment. In addition, the polylactic acid has good molding processability. The polylactic acid as environment-friendly biodegradable plastic replaces the traditional water-proof and oil-proof chemical preparation, and has strong competitiveness and wide application prospect.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a biomass oil-proofing agent for a paper pulp mould and a production process thereof, so as to overcome the defects in the prior art.
In order to achieve the above object, the present invention provides a biomass oil repellent agent for a pulp mold, comprising the following raw materials in parts by weight: 40-60 parts of polylactic acid, 10-15 parts of nano cellulose, 5-12 parts of polycaprolactone, 1-6 parts of trimethylolpropane triester and 1-3 parts of silane coupling agent.
As a further description of the biomass oil-repellent agent of the present invention, preferably, the biomass oil-repellent agent comprises the following raw materials in parts by weight: 50 parts of polylactic acid, 12 parts of nano cellulose, 9 parts of polycaprolactone, 3 parts of trimethylolpropane triester and 2 parts of a silane coupling agent.
As a further description of the biomass oil repellent agent of the present invention, the silane coupling agent is preferably an aminosilane coupling agent KH-550, an epoxy silane coupling agent KH-560, or an acyl silane coupling agent KH-570.
In order to achieve another object of the present invention, the present invention also provides a production process for preparing the biomass oil-repellent agent, comprising the following steps:
(1) putting the cassava starch into a mixing tank, introducing purified water into the mixing tank, stirring uniformly to obtain starch milk, adding 0.5 wt% of sulfurous acid solution into the starch milk, and adjusting the pH value of the starch milk to 4.5-5.0;
(2) adding high-temperature-resistant alpha-amylase into the starch milk obtained in the step (1), liquefying the starch milk through two times of continuous spraying of a spraying liquefier, adding 0.5 wt% of sulfurous acid solution, and adjusting the pH value to 4.5-5.0;
(3) pumping the liquefied liquid obtained in the step (2) into a saccharification tank, cooling the liquefied liquid to 60 ℃, then adding saccharifying enzyme, carrying out heat preservation and saccharification for 36-48 h, heating to 80 ℃, carrying out heat preservation for 20 minutes, and inactivating enzyme to obtain glucose;
(4) pumping the glucose obtained in the step (3) into a fermentation tank, cooling the fermentation tank to 40-45 ℃, then adding lactic acid bacteria, continuously introducing sterile air into the fermentation tank, and carrying out heat preservation fermentation for 48-60h to obtain lactic acid;
(5) extruding the lactic acid obtained in the step (4) through an intermittent stirring reactor and a double-screw extruder to obtain polylactic acid;
(6) and (3) adding the polylactic acid obtained in the step (5), the nano cellulose, the polycaprolactone, the trimethylolpropane triester and the silane coupling agent into a high-speed mixing roll according to the weight part ratio for melt blending to obtain the biomass oil-proofing agent.
As a further explanation of the production process of the present invention, preferably, in the step (2), the temperature of the primary injection in the injection liquefier is 95-105 ℃, the temperature is maintained for 50-60 minutes, and the temperature of the secondary injection is 135-140 ℃, the temperature is maintained for 5-10 minutes.
As a further explanation of the production process of the present invention, it is preferable that in the step (5), the temperature in the batch type agitation reactor is 100-150 ℃ and the vacuum degree is 0.1-0.2 MPa.
As a further explanation of the production process of the present invention, it is preferable that in the step (6), the melt blending temperature is 150 ℃ to 170 ℃ and the time is 5 to 10 minutes.
As a further explanation of the production process of the present invention, preferably, in step (6), 40 to 60 parts of polylactic acid, 10 to 15 parts of nanocellulose, 5 to 12 parts of polycaprolactone, 1 to 6 parts of trimethylolpropane triester, and 1 to 3 parts of a silane coupling agent. More preferably, the biomass oil-proofing agent comprises the following raw materials in parts by weight: 50 parts of polylactic acid, 12 parts of nano cellulose, 9 parts of polycaprolactone, 3 parts of trimethylolpropane triester and 2 parts of a silane coupling agent.
As a further explanation of the production process of the invention, the silane coupling agent is preferably an aminosilane coupling agent KH-550, an epoxy silane coupling agent KH-560, or an acyl silane coupling agent KH-570.
The invention has the following beneficial effects:
the method synthesizes molasses and molasses through the action of alpha-amylase and glucoamylase by potato starch, obtains lactic acid through special process fermentation, the lactic acid is extruded and polymerized into polylactic acid through an intermittent stirring reactor and a double-screw extruder, negative biomass oil-proof agent is prepared by 40-60 parts by weight of polylactic acid, 10-15 parts by weight of nano-cellulose, 5-12 parts by weight of polycaprolactone, 1-6 parts by weight of trimethylolpropane triester and 1-3 parts by weight of silane coupling agent, concretely, the polylactic acid is prepared based on cassava starch, the polylactic acid and the nano-cellulose are uniformly mixed and melted, under the action of the polycaprolactone and the trimethylolpropane triester, the negative biomass oil-proof agent is prepared, the negative biomass oil-proof agent is directly added into positive paper pulp with the concentration of 0.3 percent for low-speed stirring, the negative biomass oil-proof agent is combined with the positive paper pulp fibers in a wrapping way, the blank of the product formed after the vacuum dehydration of the mold is subjected to 40-60T high pressure of the product heat setting mold and 190-200 high temperature, the situation that the fiber repels 100 ℃ of food hot oil and the hot oil does not leak and plays a role in oil prevention is changed, the measured tensile strength of the oil-proof paper is 4.12-4.23kN/m, the bursting strength is 800-900kPa, and the oil prevention grade is 9, so that the oil prevention performance of the product of the pulp mold is improved, the oil prevention agent is synthesized by a biomass material, has no chemical components, is fluorine-free, non-toxic, harmless, environment-friendly and beneficial to the health of consumers, meets the standard requirement of 'BPI' compostable materials in Europe and America, and is environment-friendly and completely degradable.
Detailed Description
In order to further understand the present invention, the following detailed description is given with reference to the accompanying preferred embodiments, which are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention.
High temperature resistant alpha-amylase (from Hubei Xinxin Jiali Biotech Co., Ltd.).
An aminosilane coupling agent KH-550, an epoxy silane coupling agent KH-560, and an acyl silane coupling agent KH-570 (available from LongkI chemical Co., Ltd., Guangzhou).
Example 1:
putting a certain amount of cassava starch into a mixing tank, introducing purified water into the mixing tank, wherein the weight ratio of the cassava starch to the purified water is 1:1, uniformly stirring to obtain starch milk, adding 0.5 wt% of a sulfurous acid solution into the starch milk, and adjusting the pH value of the starch milk to 5.
Adding high-temperature-resistant alpha-amylase into the obtained starch milk, liquefying the starch milk by two times of continuous spraying of a spraying liquefier, keeping the temperature of the primary spraying in the spraying liquefier at 95 ℃, keeping the temperature for 50 minutes, keeping the temperature of the secondary spraying at 135 ℃, keeping the temperature for 5 minutes, adding 0.5 wt% of sulfurous acid solution, and adjusting the pH value to 4.5.
Pumping the obtained liquefied liquid into a saccharification tank, cooling the liquefied liquid to 60 ℃, adding saccharifying enzyme, carrying out heat preservation and saccharification for 36 hours, heating to 80 ℃, carrying out heat preservation for 20 minutes, and inactivating enzyme to obtain glucose.
Pumping the obtained glucose into a fermentation tank, cooling the fermentation tank to 40 ℃, adding lactic acid bacteria, continuously introducing sterile air into the fermentation tank, and carrying out heat preservation fermentation for 48 hours to obtain lactic acid.
Extruding the obtained lactic acid through an intermittent stirring reactor and a double-screw extruder to obtain polylactic acid; wherein the temperature in the batch type stirring reactor is 100 ℃, and the vacuum degree is 0.1 Mpa.
And adding 40 parts of the obtained polylactic acid, 10 parts of nano-cellulose, 5 parts of polycaprolactone, 1 part of trimethylolpropane triester and 1 part of aminosilane coupling agent KH-5501 into a high-speed mixing roll for melt blending to obtain the biomass oil-proofing agent. Wherein the melt blending temperature is 150 ℃ and the time is 5 minutes.
The invention adopts sulfurous acid to adjust the pH value and takes the sulfurous acid as a catalyst in the subsequent reaction process of alpha-amylase and saccharifying enzyme to convert the cassava starch into the glucose, thereby improving the 5 percent conversion rate of the glucose and obtaining the polylactic acid with good solvent resistance. Polylactic acid and nano-cellulose are uniformly mixed and melted, and the oil-proof agent is prepared under the action of polycaprolactone and trimethylolpropane triester. The prepared oil-proof agent is directly added into positive paper pulp with the concentration of 0.3 percent to be stirred at low speed, the negative biomass oil-proof agent is wrapped and combined with positive paper pulp fibers, blanks of a formed product after vacuum dehydration of a mold are subjected to 40-60T high pressure of a product heat setting mold, and under the action of 190-200 DEG high temperature, the situation that the fibers repel hot oil of food with the temperature of 100 ℃ is changed, the hot oil does not leak, and the oil-proof effect is achieved, the measured tensile strength of the oil-proof paper is 4.23kN/m, the breakage resistance is 900kPa, and the oil-proof grade is 9. Improves the oil-proof function of the paper pulp mould, is environment-friendly and can be completely degraded.
Example 2:
putting a certain amount of cassava starch into a mixing tank, introducing purified water into the mixing tank, wherein the weight ratio of the cassava starch to the purified water is 1:1, uniformly stirring to obtain starch milk, adding 0.5 wt% of a sulfurous acid solution into the starch milk, and adjusting the pH value of the starch milk to 5.5.
Adding high-temperature-resistant alpha-amylase into the obtained starch milk, liquefying the starch milk by two times of continuous spraying of a spraying liquefier, keeping the temperature of primary spraying in the spraying liquefier at 105 ℃ for 60 minutes, keeping the temperature of secondary spraying at 140 ℃ for 10 minutes, adding 0.5 wt% of sulfurous acid solution, and adjusting the pH value to 5.
Pumping the obtained liquefied liquid into a saccharification tank, cooling the liquefied liquid to 60 ℃, adding saccharifying enzyme, carrying out heat preservation and saccharification for 48 hours, heating to 80 ℃, carrying out heat preservation for 20 minutes, and inactivating enzyme to obtain glucose.
Pumping the obtained glucose into a fermentation tank, cooling the fermentation tank to 45 ℃, adding lactic acid bacteria, continuously introducing sterile air into the fermentation tank, and carrying out heat preservation fermentation for 60 hours to obtain lactic acid.
Extruding the obtained lactic acid through an intermittent stirring reactor and a double-screw extruder to obtain polylactic acid; wherein the temperature in the batch type stirring reactor is 150 ℃, and the vacuum degree is 0.2 Mpa.
And adding 60 parts of the obtained polylactic acid, 15 parts of nano-cellulose, 12 parts of polycaprolactone, 6 parts of trimethylolpropane triester and 6 parts of epoxy silane coupling agent KH-5603 parts into a high-speed mixing roll for melt blending to obtain the biomass oil-proofing agent. Wherein the melt blending temperature is 170 ℃ and the time is 5-10 minutes.
The invention adopts sulfurous acid to adjust the pH value and takes the sulfurous acid as a catalyst in the subsequent reaction process of alpha-amylase and saccharifying enzyme to convert the cassava starch into the glucose, thereby improving the 5 percent conversion rate of the glucose and obtaining the polylactic acid with good solvent resistance. Polylactic acid and nano-cellulose are uniformly mixed and melted, and the oil-proof agent is prepared under the action of polycaprolactone and trimethylolpropane triester. The prepared oil-proof agent is directly added into positive paper pulp with the concentration of 0.3 percent to be stirred at low speed, the negative biomass oil-proof agent is wrapped and combined with positive paper pulp fibers, blanks of a formed product after vacuum dehydration of a mold are subjected to 40-60T high pressure of a product heat setting mold, and under the action of 190-200 DEG high temperature, the situation that the fibers repel hot oil of food with the temperature of 100 ℃ and the hot oil does not leak is changed, so that the oil-proof effect is achieved, the measured tensile strength of the oil-proof paper is 4.12kN/m, the breakage resistance is 800kPa, and the oil-proof grade is 9. Improves the oil-proof function of the paper pulp mould, is environment-friendly and can be completely degraded.
Example 3:
putting a certain amount of cassava starch into a mixing tank, introducing purified water into the mixing tank, wherein the weight ratio of the cassava starch to the purified water is 1:1, uniformly stirring to obtain starch milk, adding 0.5 wt% of a sulfurous acid solution into the starch milk, and adjusting the pH value of the starch milk to 5.2.
Adding high-temperature-resistant alpha-amylase into the obtained starch milk, liquefying the starch milk by two times of continuous spraying of a spraying liquefier, keeping the temperature of the primary spraying in the spraying liquefier at 100 ℃, keeping the temperature for 55 minutes, keeping the temperature of the secondary spraying at 138 ℃, keeping the temperature for 7 minutes, adding 0.5 wt% of sulfurous acid solution, and adjusting the pH to 4.8.
Pumping the obtained liquefied liquid into a saccharification tank, cooling the liquefied liquid to 60 ℃, adding saccharifying enzyme, carrying out heat preservation and saccharification for 42 hours, heating to 80 ℃, carrying out heat preservation for 20 minutes, and inactivating enzyme to obtain glucose.
Pumping the obtained glucose into a fermentation tank, cooling the fermentation tank to 43 ℃, adding lactic acid bacteria, continuously introducing sterile air into the fermentation tank, and carrying out heat preservation fermentation for 54h to obtain lactic acid.
Extruding the obtained lactic acid through an intermittent stirring reactor and a double-screw extruder to obtain polylactic acid; wherein the temperature in the batch type stirring reactor is 125 ℃, and the vacuum degree is 0.15 Mpa.
Adding 50 parts of the obtained polylactic acid, 12 parts of nano-cellulose, 9 parts of polycaprolactone, 3 parts of trimethylolpropane triester and 3 parts of acyl silane coupling agent KH-5702 parts into a high-speed mixing roll for melt blending to obtain the biomass oil-proofing agent. Wherein the melt blending temperature is 160 ℃ and the time is 8 minutes.
The invention adopts sulfurous acid to adjust the pH value and takes the sulfurous acid as a catalyst in the subsequent reaction process of alpha-amylase and saccharifying enzyme to convert the cassava starch into the glucose, thereby improving the 5 percent conversion rate of the glucose and obtaining the polylactic acid with good solvent resistance. Polylactic acid and nano-cellulose are uniformly mixed and melted, and the oil-proof agent is prepared under the action of polycaprolactone and trimethylolpropane triester. The prepared oil-proof agent is directly added into positive paper pulp with the concentration of 0.3 percent to be stirred at low speed, the negative biomass oil-proof agent is wrapped and combined with positive paper pulp fibers, blanks of a formed product after vacuum dehydration of a mold are subjected to 40-60T high pressure of a product heat setting mold, and under the action of 190-200 DEG high temperature, the situation that the fibers repel hot oil of food with the temperature of 100 ℃ and the hot oil does not leak is changed, so that the oil-proof effect is achieved, the measured tensile strength of the oil-proof paper is 4.18kN/m, the breakage resistance is 820kPa, and the oil-proof grade is 9 grade. Improves the oil-proof function of the paper pulp mould, is environment-friendly and can be completely degraded.
It should be noted that the above summary and the detailed description are intended to demonstrate the practical application of the technical solutions provided by the present invention, and should not be construed as limiting the scope of the present invention. Various modifications, equivalent substitutions, or improvements may be made by those skilled in the art within the spirit and principles of the invention. The scope of the invention is to be determined by the appended claims.
Claims (6)
1. A production process for preparing a biomass oil-repellent agent for a pulp mold is characterized by comprising the following steps:
(1) putting the cassava starch into a mixing tank, introducing purified water into the mixing tank, stirring uniformly to obtain starch milk, adding 0.5 wt% of sulfurous acid solution into the starch milk, and adjusting the pH value of the starch milk to 4.5-5.0;
(2) adding high-temperature-resistant alpha-amylase into the starch milk obtained in the step (1), liquefying the starch milk through two times of continuous spraying of a spraying liquefier, adding 0.5 wt% of sulfurous acid solution, and adjusting the pH value to 4.5-5.0;
(3) pumping the liquefied liquid obtained in the step (2) into a saccharification tank, cooling the liquefied liquid to 60 ℃, then adding saccharifying enzyme, carrying out heat preservation and saccharification for 36-48 h, heating to 80 ℃, carrying out heat preservation for 20 minutes, and inactivating enzyme to obtain glucose;
(4) pumping the glucose obtained in the step (3) into a fermentation tank, cooling the fermentation tank to 40-45 ℃, then adding lactic acid bacteria, continuously introducing sterile air into the fermentation tank, and carrying out heat preservation fermentation for 48-60h to obtain lactic acid;
(5) extruding the lactic acid obtained in the step (4) through an intermittent stirring reactor and a double-screw extruder to obtain polylactic acid;
(6) adding the polylactic acid obtained in the step (5), the nano-cellulose, the polycaprolactone, the trimethylolpropane triester and the silane coupling agent into a high-speed mixing roll according to the weight part ratio for melt blending to obtain the biomass oil-proofing agent;
the biomass oil-proofing agent comprises the following raw materials in parts by weight: 40-60 parts of polylactic acid, 10-15 parts of nano cellulose, 5-12 parts of polycaprolactone, 1-6 parts of trimethylolpropane triester and 1-3 parts of silane coupling agent.
2. The process according to claim 1, wherein in the step (2), the temperature of the primary injection in the injection liquefier is 95-105 ℃, and the temperature is maintained for 50-60 minutes, and the temperature of the secondary injection is 135-140 ℃, and the temperature is maintained for 5-10 minutes.
3. The production process according to claim 1, wherein in the step (5), the temperature in the batch stirred reactor is 100 ℃ and 150 ℃ and the vacuum degree is 0.1 to 0.2 MPa.
4. The production process according to claim 1, wherein in the step (6), the melt blending temperature is 150 ℃ and 170 ℃ for 5 to 10 minutes.
5. The production process according to claim 1, wherein the biomass oil repellent agent comprises the following raw materials in parts by weight: 50 parts of polylactic acid, 12 parts of nano cellulose, 9 parts of polycaprolactone, 3 parts of trimethylolpropane triester and 2 parts of a silane coupling agent.
6. The process according to claim 1 or 5, wherein the silane coupling agent is selected from the group consisting of an aminosilane coupling agent KH-550, an epoxy silane coupling agent KH-560, and an acylsilane coupling agent KH-570.
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| CN107938420A (en) * | 2017-11-08 | 2018-04-20 | 常州欣彬纺织品有限公司 | A kind of preparation method of biodegradation type greaseproof |
| CN108625219B (en) * | 2018-05-21 | 2021-03-16 | 浙江杭化新材料科技有限公司 | Preparation method of hydrophobic oil-proof paper |
| CN108892911B (en) * | 2018-06-11 | 2020-10-02 | 浙江理工大学 | Preparation method of 3D porous cross-linked composite aerogel assembled by thermal bonding reinforcement nano fibers |
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