CN111676731B - Preparation method of medical crepe paper - Google Patents
Preparation method of medical crepe paper Download PDFInfo
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- CN111676731B CN111676731B CN202010397925.XA CN202010397925A CN111676731B CN 111676731 B CN111676731 B CN 111676731B CN 202010397925 A CN202010397925 A CN 202010397925A CN 111676731 B CN111676731 B CN 111676731B
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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
- D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
-
- 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
- D21H17/12—Organo-metallic compounds
-
- 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
-
- 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
-
- 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
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- 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
- 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
- D21H21/16—Sizing or water-repelling agents
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Abstract
The invention relates to the field of papermaking, and provides a preparation method of medical crepe paper aiming at the problem of insufficient antibacterial property of the medical crepe paper. The invention selects polyoxyethylene stearate nonionic softening agent, solves the problem of paper softness, meets medical requirements and meets papermaking requirements, and the antibacterial agent is added into the fiber raw material, so that the medical crepe paper obtains better antibacterial performance through physical and chemical comprehensive antibacterial action.
Description
Technical Field
The invention relates to the field of papermaking, in particular to a preparation method of medical crepe paper.
Background
The medical crepe paper is a packing material for a trolley, an operating room table surface, a spread sheet in an aseptic area and the like, and is suitable for sterilization after packing medical equipment. With the continuous improvement of living standard of people and the defects of short storage life, fiber deformation after repeated cleaning and the like of the traditional cotton cloth packaging material, crepe paper is mostly adopted to replace the traditional cotton cloth in the market at present, and the novel crepe paper has very wide market prospect. The disposable packaging material is used for packaging hospital regenerated equipment, so that the links of cotton cloth packaging such as recycling, cleaning, ironing, finishing, conveying and the like are omitted, and the use is convenient.
Chinese patent CN103161092B discloses a medical crepe paper base paper, which is made from cotton pulp and softwood pulp as fiber raw materials according to the traditional paper making process, i.e. pulping → rinsing → homogenizing → paper making → cutting → packaging. The invention uses cotton pulp as main raw material, combines with softwood pulp as auxiliary raw material, combines the characteristics of strong and tough cotton fiber property, fine and soft tissue, good folding and abrasion resistance and good absorbability, and the prepared paper is fine and soft and has good smoothness. The PPE wet strength agent is added into the sizing agent, so that the strength, the stiffness, the smoothness and the water resistance of the base paper of the crepe paper are further improved. Provides the medical crepe paper base paper with soft hand feeling, good air permeability, high strength, high elongation, good finish and good water resistance. However, like the common medical crepe paper, the antibacterial property is that a unique barrier is formed due to the special porous arrangement, so that media such as steam and the like can be bent and penetrated into the bag, and microorganisms such as bacteria and the like are effectively isolated, so that the medical crepe paper can be stored for a long time without being polluted. However, this physical approach alone does not provide good antimicrobial properties, and thus an ideal solution is needed.
Disclosure of Invention
The invention provides a preparation method of medical crepe paper, aiming at overcoming the problem of insufficient antibacterial property of the medical crepe paper.
In order to achieve the purpose, the invention adopts the following technical scheme: a preparation method of medical crepe paper comprises the following steps: the medical crepe paper is prepared by taking northern wood pulp as a fiber raw material and sequentially performing pulping, long fiber free pulping, pulp grinding, homogenate, paper making, wet vat creping and drying, and the fiber raw material is added with polyoxyethylene stearate nonionic softener and antibacterial agent after being ground into pulp.
The crepe paper has requirements on both strength and softness, so that northern wood pulp with higher strength is selected as a raw material. The free pulping mode of the long fiber can reduce the pulp degree as much as possible on the premise of meeting the strength of paper. Because of the particularity of the medical crepe paper, the softening agent needs to meet medical requirements and papermaking requirements besides solving the problem of paper softness, and the inventor finally selects the polyoxyethylene stearate nonionic softening agent through screening to meet the requirements, improve the water absorption of the paper and facilitate later recovery of the paper. The common medical crepe paper is a barrier formed by special porous arrangement of the paper, but the antibacterial effect is limited only by the physical mode, so the antibacterial agent is added into the fiber raw material, and the medical crepe paper obtains better antibacterial performance through the comprehensive antibacterial action of physics and chemistry.
Preferably, the antibacterial agent is added in the following manner: adding m-hydroxy cinnamic acid and persulfate into the homogenized fiber raw material at a mass ratio of 100 (10-20): (0.15-0.3), dropwise adding an acetate solution of polyvalent metal cations with the mass of 5-15% of the m-hydroxy cinnamic acid at a speed of 20-30 mL/min under stirring, reacting at 200-240 ℃ for 45-60 min under the atmosphere of nitrogen, and standing. On one hand, m-hydroxy cinnamic acid has small molecular weight and can be inserted among fiber raw materials, the fiber raw materials and the m-hydroxy cinnamic acid contain hydroxyl and carboxyl, polyvalent metal cations and functional groups can be grafted to the fiber raw materials and the m-hydroxy cinnamic acid after ion exchange, and the polyvalent metal cations have antibacterial performance, so that the medical crepe paper has antibacterial performance. On the other hand, carboxyl of the m-hydroxy cinnamic acid and polyvalent metal cations are coordinated and complexed to form a cross-linked polymer, so that an interpenetrating network structure is formed between the m-hydroxy cinnamic acid and the fiber raw material, the bonding force between the m-hydroxy cinnamic acid and the fiber raw material is enhanced, metal ions can be enveloped in the interpenetrating network structure, and the dissociation of the metal ions is reduced. In order to ensure that media such as ethylene oxide can permeate into the bag during sterilization of the medical crepe paper, the medical crepe paper needs to have strong penetrability. Therefore, the m-hydroxy cinnamic acid containing benzene rings is adopted, compared with chain molecules, the benzene rings increase the volume, are not easy to block original through holes and do not influence the air permeability of the medical crepe paper. The complexation reaction of the m-hydroxy cinnamic acid and the polyvalent metal cation occurs under the initiation of persulfate, and the reaction is carried out under the nitrogen range in consideration of the polymerization inhibition effect of oxygen on the reaction. In conclusion, the function of adding the m-hydroxy cinnamic acid is to increase the binding points of metal ions on one hand, and to increase the stability of the metal ions and the strength of the medical crepe paper by mutually enveloping the m-hydroxy cinnamic acid and the fiber raw material on the other hand, and the m-hydroxy cinnamic acid contains hydroxyl and carboxyl, so that the water absorption of the paper can be improved.
Preferably, the acetate solution of the polyvalent metal cation is one or a mixture of copper acetate, zinc acetate, calcium acetate and manganese acetate.
Preferably, the polyoxyethylene stearate nonionic softener is added in the following mode: after being diluted by water, the softening agent is continuously added at the outlet of the fan pump according to the addition of 0.5-0.7 percent of the mass of the fiber raw material.
Preferably, wet vat creping is performed with a sheet dryness of 30% to 40%. The hydrogen bond bonding force between fibers is not formed under the condition that the dryness of the paper sheet is 30-40%, and because the wet paper sheet has low strength, wrinkles formed after collision of a wrinkling scraper are uniform and consistent, and bad phenomena such as paper scraps, paper powder and the like can not be generated.
Preferably, in the wet vat creping step, the moisture content of the paper sheet discharged from the vat is controlled to be 58-62%, the thickness of the doctor blade is 0.7-0.9 mm, and the included angle between the doctor blade and the vat is 7-9 °. The wrinkles obtained by the method are fine and deep, and the softness of the paper can be increased.
Preferably, after the wet vat creping step, the water repellent agent is uniformly coated on the surface of the medical crepe paper in a spraying or rolling way, and then the medical crepe paper is dried by a dryer. The water-resistant agent makes the fine fibers of the fiber raw material part bonded into a sheet and connected with the coarse fibers, so that the fibers are combined more tightly, and the medical crepe paper has water resistance when in use.
Therefore, the beneficial effects of the invention are as follows: the polyoxyethylene stearate non-ionic softening agent is selected, so that the problem of paper softness is solved, the medical requirement is met, and the papermaking requirement is met.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In the present invention, unless otherwise specified, all the raw materials and equipment used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
Example 1
A preparation method of medical crepe paper comprises the following steps: taking northern wood needle wood pulp as a fiber raw material, sequentially pulping, free pulping of long fibers, grinding into thick liquid, homogenizing, adding an antibacterial agent, adding a polyoxyethylene stearate nonionic softening agent, papermaking, wet vat creping and drying by a dryer to obtain the medical crepe paper.
Wherein the step of adding the antibacterial agent comprises the following steps: adding m-hydroxycinnamic acid and persulfate into the homogenized fiber raw material at a mass ratio of 100:10:0.15, dropwise adding a manganese acetate solution with the mass of 5% of the m-hydroxycinnamic acid at a speed of 20 mL/min under stirring, reacting at 230 ℃ for 60 min under a nitrogen atmosphere, and standing for 20 min.
The step of adding the softening agent is as follows: after being diluted by water, the softening agent is continuously and uniformly added at the outlet of a fan pump within 5 min according to the total addition of 0.6 percent of the mass of the fiber raw material.
The paper dryness before wet vat wrinkling is 30%, the water content of the paper discharged from the vat in the wet vat wrinkling process is controlled to be 60%, the thickness of the scraper blade is 0.8 mm, and the included angle between the scraper and the vat is 7 degrees.
Example 2
A preparation method of medical crepe paper comprises the following steps: taking northern wood needle wood pulp as a fiber raw material, sequentially performing pulping, long fiber free pulping, homogenate, adding an antibacterial agent, adding a polyoxyethylene stearate nonionic softening agent, papermaking, wet vat creping, spraying a water repellent agent-30 (sold in the market) on the surface of the medical crepe paper, and drying by a dryer to obtain the medical crepe paper.
Wherein the step of adding the antibacterial agent comprises the following steps: adding m-hydroxy cinnamic acid and persulfate into the homogenized fiber raw material at a mass ratio of 100:20:0.3, dropwise adding an acetate solution with the mass of 15% of the m-hydroxy cinnamic acid at a speed of 30 mL/min under stirring, wherein the acetate is a mixture of zinc acetate and calcium acetate with the same mole, reacting at 200 ℃ for 50 min under a nitrogen atmosphere, and standing for 20 min.
The step of adding the softening agent is as follows: after being diluted by water, the softening agent is continuously and uniformly added at the outlet of a fan pump within 8 min according to the total addition of 0.7 percent of the mass of the fiber raw material.
The paper dryness before wet vat wrinkling is 40%, the water content of the paper discharged from the vat in the wet vat wrinkling process is controlled to be 58%, the thickness of the scraper blade is 0.9 mm, and the included angle between the scraper and the vat is 8 degrees.
Example 3
A preparation method of medical crepe paper comprises the following steps: taking northern wood needle wood pulp as a fiber raw material, sequentially performing pulping, long fiber free pulping, homogenate, adding an antibacterial agent, adding a polyoxyethylene stearate nonionic softening agent, papermaking, wet vat creping, coating a water repellent agent-30 (sold in the market) on the surface of the medical crepe paper, and drying by a dryer to obtain the medical crepe paper.
Wherein the step of adding the antibacterial agent comprises the following steps: adding m-hydroxy cinnamic acid and persulfate into the homogenized fiber raw material at a mass ratio of 100:15:0.2, dropwise adding a copper acetate solution with the mass of 10% of the m-hydroxy cinnamic acid at a speed of 25 mL/min under stirring, reacting at 240 ℃ for 45 min under a nitrogen atmosphere, and standing for 20 min.
The step of adding the softening agent is as follows: after being diluted by water, the softening agent is continuously and uniformly added at the outlet of a fan pump within 8 min according to the total addition of 0.5 percent of the mass of the fiber raw material.
The paper dryness before wet vat wrinkling is 37 percent, the water content of a paper discharged from the vat is controlled to be 62 percent in the wet vat wrinkling process, the thickness of a scraper blade is 0.7 mm, and the included angle between the scraper and the vat is 9 degrees.
Comparative example 1
A preparation method of medical crepe paper comprises the following steps: taking northern wood-needle wood pulp as a fiber raw material, sequentially performing pulping, long fiber free pulping, homogenate, adding polyoxyethylene stearate nonionic softener, papermaking, wet vat creping, roll-coating a water repellent agent-30 (sold in the market) on the surface of the medical crepe paper, and drying by a dryer to obtain the medical crepe paper.
The step of adding the softening agent is as follows: after being diluted by water, the softening agent is continuously and uniformly added at the outlet of a fan pump within 8 min according to the total addition of 0.5 percent of the mass of the fiber raw material.
The paper dryness before wet vat wrinkling is 37 percent, the water content of a paper discharged from the vat is controlled to be 62 percent in the wet vat wrinkling process, the thickness of a scraper blade is 0.7 mm, and the included angle between the scraper and the vat is 9 degrees.
Comparative example 2
A preparation method of medical crepe paper comprises the following steps: taking northern wood pulp as a fiber raw material, sequentially performing pulping, long fiber free pulping, homogenate, adding a copper acetate antibacterial agent, adding a polyoxyethylene stearate nonionic softening agent, papermaking, wet vat creping, coating a water repellent agent-30 (sold in the market) on the surface of the medical crepe paper, and drying by a dryer to obtain the medical crepe paper.
The step of adding the softening agent is as follows: after being diluted by water, the softening agent is continuously and uniformly added at the outlet of a fan pump within 8 min according to the total addition of 0.5 percent of the mass of the fiber raw material.
The paper dryness before wet vat wrinkling is 37 percent, the water content of a paper discharged from the vat is controlled to be 62 percent in the wet vat wrinkling process, the thickness of a scraper blade is 0.7 mm, and the included angle between the scraper and the vat is 9 degrees.
Result detection
The detection results of the main technical indexes of the embodiments 1 to 3 meet the following requirements: 1) tensile strength: the longitudinal direction is more than or equal to 1.40 KN/m, and the transverse direction is more than or equal to 0.70 KN/m; 2) elongation percentage: longitudinal is more than or equal to 12 percent, and transverse is more than or equal to 2.3 percent; 3) drapability: longitudinal direction is less than or equal to 120 mm, and transverse direction is less than or equal to 150 mm.
In order to verify that the medical crepe paper has an improvement effect on the antibacterial effect of the medical crepe paper, 2 parts of the medical crepe paper of the above examples and comparative examples are cut into 50 cm by 50 cm, medical instruments are packaged, cotton balls and self-contained biological indicators are contained in the medical instruments, and pressure steam sterilization is carried out at the same time, wherein the temperature is 132 ℃ and the pressure is 0.21 MPa. And (4) carrying out biological culture after the sterilization is finished, observing the sterilization effect for 48 h, and sampling and detecting on 7 th, 14 th, 30 th, 60 th, 90 th, 120 th, 180 th and 240 th days after the sterilization. The results were: the sterilization effect is observed within 48 hours, and the biological culture is negative, so that the sterilization effect is achieved. Examples 1-3 are medical crepe papers prepared by the method of the present invention and grown aseptically until day 240. Comparative example 1 had a little bacterial growth on day 120 and comparative example 2 started to have bacterial growth on day 180. The medical crepe paper prepared by the method is superior to the comparative example in the antibacterial strength and the antibacterial durability. The difference between the comparative example 1 and the example 3 is that the medical crepe paper of the comparative example 1 is close to the structure of the crepe paper as a barrier for blocking bacteria without adding the antibacterial agent, and after a long time, the medical crepe paper cannot be antibacterial any more along with the deformation of the structure or the increase of bacteria. Comparative example 2 is different from example 3 in that, as the hydroxycinnamic acid having a protective effect on metal ions and a reinforcing effect on medical crepe paper as described above is not added, both of which contribute to the antibacterial durability, the addition of hydroxycinnamic acid can prolong the antibacterial ability of medical crepe paper.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The preparation method of the medical crepe paper is characterized by comprising the following steps: taking northern wood needle wood pulp as a fiber raw material, sequentially performing pulping, long fiber free pulping, homogenate, papermaking, wet vat wrinkling and drying to prepare medical crepe paper, and adding a polyoxyethylene stearate nonionic softener and an antibacterial agent after the fiber raw material is subjected to pulping;
the addition mode of the antibacterial agent is as follows: adding m-hydroxy cinnamic acid and persulfate into the homogenized fiber raw material at a mass ratio of 100 (10-20): (0.15-0.3), dropwise adding an acetate solution of polyvalent metal cations with the mass of 5-15% of the m-hydroxy cinnamic acid at a speed of 20-30 mL/min under stirring, reacting at 200-240 ℃ for 45-60 min under the atmosphere of nitrogen, and standing.
2. The method for preparing the medical crepe paper according to claim 1, wherein the acetate solution of the polyvalent metal cations is one or a mixture of copper acetate, zinc acetate, calcium acetate and manganese acetate.
3. The preparation method of the medical crepe paper according to claim 1, wherein the polyoxyethylene stearate nonionic softener is added in the following manner: after being diluted by water, the softening agent is continuously added at the outlet of the fan pump according to the addition of 0.5-0.7 percent of the mass of the fiber raw material.
4. The method for preparing medical crepe paper according to claim 1, wherein the wet vat creping is performed with a sheet dryness of 30-40%.
5. The method for preparing medical crepe paper according to claim 1 or 4, wherein in the wet vat creping step, the moisture content of a paper sheet discharging vat is controlled to be 58-62%, the thickness of the scraper blade is 0.7-0.9 mm, and the included angle between the scraper and the vat is 7-9 °.
6. The method for preparing the medical crepe paper according to claim 1, wherein after the wet vat creping step, the water repellent agent is uniformly coated on the surface of the medical crepe paper in a spraying or rolling manner, and then the medical crepe paper is dried by a dryer.
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