CN113089380A - Heat-sealing self-adhesive high-strength medical dialyzing paper and processing method thereof - Google Patents
Heat-sealing self-adhesive high-strength medical dialyzing paper and processing method thereof Download PDFInfo
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/02—Esters
- C08B31/04—Esters of organic acids, e.g. alkenyl-succinated starch
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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
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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
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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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/17—Ketenes, e.g. ketene dimers
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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
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
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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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- 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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
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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
- D21H21/16—Sizing or water-repelling agents
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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
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
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Abstract
The invention discloses heat-sealing self-adhesive high-strength medical dialyzing paper and a processing method thereof. The medical dialyzing paper consists of base paper and a sizing layer coated on the surface of the base paper; the raw paper contains plant fiber, adhesive and chemical additive; the sizing layer contains modified starch; the modified starch is prepared from 3-acetoxyl-3-methylpentane-1, 5-diacid anhydride modified starch; the processing steps comprise: pulping the plant fibers to form paper pulp, and then adding an adhesive and a chemical additive to obtain mixed paper pulp; making the mixed paper pulp on a fourdrinier papermaking machine to prepare base paper; and (3) carrying out surface sizing on the base paper by using a surface sizing solution, drying, press polishing and reeling to obtain the medical dialyzing paper. The prepared heat-seal self-adhesive high-strength medical dialyzing paper has high heat-seal strength, peeling strength and bursting strength, and also has good air permeability and water resistance.
Description
Technical Field
The invention belongs to the field of medical instrument packaging materials, and particularly relates to heat-seal self-adhesive high-strength medical dialyzing paper and a processing method thereof.
Background
With the development of automatic packaging machines, the heat sealing performance of flexible packaging materials is becoming one of the key indicators of concern again. Unlike the past, the focus was not on the final heat seal strength of the material (strength after complete cooling at the heat seal) but on the hot tack of the material (strength without cooling at the heat seal); the heat sealing bag is generally applied to the fields of daily chemical products, food, medicine packaging and the like.
The dialysis paper is mostly used for packaging medical instruments, and usually, dialysis base paper is obtained and then coated, and then the paper-plastic bag is made of the dialysis base paper and a plastic film. The dialyzing paper has certain strength requirement as medical packaging paper and has better bacterium-resisting effect. The bacteria-resistant effect is an important index of the dialyzing paper, and usually, in order to obtain a better bacteria-resistant effect, the coating treatment is carried out on the surface of the base paper, so that the production cost of the dialyzing paper is improved, and the production efficiency is reduced.
In the prior art, for example, application publication No. CN 109853297A discloses a medical dialysis base paper and a production method thereof; the method comprises the following steps: adopting bleached chemical softwood pulp board and bleached chemical hardwood pulp board as raw materials; respectively crushing and pulping bleached chemical softwood pulp boards and bleached chemical hardwood pulp boards for later use; mixing the pulp in a pulp blending tank according to a proportion, adding a sizing agent and a wet strength agent, stirring, and then feeding the pulp to a papermaking forebay for later use; the pulp is made into qualified finished products through procedures of size mixing box, fan pump, conical slag remover, pressure screen wire-feeding part for papermaking and forming, squeezing part for dewatering, front drying part drying, surface sizing, back drying part drying, soft calender finishing, paper winder, rewinder and the like.
Disclosure of Invention
The invention aims to provide the heat-seal self-adhesive high-strength medical dialyzing paper which has higher heat-seal strength, peel strength and bursting strength, and simultaneously has better air permeability and water resistance.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a heat-seal self-adhesive high-strength medical dialyzing paper is composed of base paper and a sizing layer coated on the surface of the base paper;
the raw paper contains plant fiber, adhesive and chemical additive;
the sizing layer contains modified starch;
the modified starch is prepared from 3-acetoxyl-3-methylpentane-1, 5-diacid anhydride modified starch.
According to the medical dialyzing paper, the 3-acetoxyl group-3-methylpentane-1, 5-diacid anhydride is adopted to modify starch to obtain modified starch, and the modified starch is used as a sizing layer of the medical dialyzing paper to prepare the medical dialyzing paper, so that the medical dialyzing paper has high heat seal strength, peel strength and water resistance, and simultaneously has good air permeability; probably because compared with unmodified starch, the surface and the form of particles in the modified starch are changed to a certain extent due to the introduction of some active groups, the modified starch can prevent the aggregation of starch particles to a certain extent, can be uniformly dispersed in the emulsion, enables the emulsion to have good fluidity, improves the physical and chemical properties of the starch, and is used as a component of a sizing solution, so that the heat seal strength and the peeling strength of medical dialyzing paper and other film packaging materials are improved, meanwhile, the water absorption of the medical dialyzing paper is reduced, the medical dialyzing paper has excellent water resistance, and the medical dialyzing paper has higher air permeability and bursting strength, so that various performance indexes of the medical dialyzing paper meet the use standards.
Preferably, the modified starch is prepared as follows:
the preparation method comprises the steps of putting cassava starch into distilled water to prepare starch milk with the concentration of 15-30 wt%, carrying out constant-temperature water bath at 40-50 ℃, adding 3-acetoxyl-3-methylpentane-1, 5-diacid anhydride, wherein the weight of the 3-acetoxyl-3-methylpentane-1, 5-diacid anhydride is 2-6% of that of the cassava starch, adjusting the pH of a system to be 8.1-8.4 by using 3-5% NaOH, adjusting the pH of the system to be 6.2-6.5 by using 0.5-1.5 mol/L hydrochloric acid solution after reaction is finished, washing the system for 3-5 times by using ethanol, drying at 45-55 ℃, crushing and sieving to obtain the modified starch.
Preferably, in the raw paper components, by weight, 75-90 parts of plant fibers, 0.6-1.5 parts of adhesive and 0.3-1.2 parts of chemical additive are included.
More preferably, the plant fibers are softwood fibers and hardwood fibers.
Preferably, the weight ratio of the softwood fibers to the hardwood fibers in the plant fibers is 2.5-4.5: 1.
Preferably, the adhesive is a PPE wet strength agent.
Preferably, the chemical additive contains AKD and triptolide triol; AKD, the addition of triptolide triol for it plays certain synergism with other composition interactions, has further improved medical dialyzing paper's heat-seal self-adhesion property, even medical dialyzing paper has higher heat-seal strength and air permeability, makes medical dialyzing paper have good bursting strength simultaneously.
More preferably, in the chemical additive, the weight ratio of AKD to triptolide triol is 1: 0.3-0.8.
Preferably, the sizing layer component also comprises one or a mixture of polyvinyl alcohol and petroleum resin.
Preferably, the weight of the sizing layer is 1.8-3.5% of the weight of the base paper.
The invention also discloses a processing method of the heat-sealing self-adhesive high-strength medical dialyzing paper.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a processing method of heat-seal self-adhesive high-strength medical dialyzing paper comprises the following steps:
the process 1 comprises the following steps: pulping the plant fibers to form paper pulp, and then adding an adhesive and a chemical additive to obtain mixed paper pulp;
and (2) a process: making the mixed paper pulp on a fourdrinier papermaking machine to prepare base paper;
and (3) a process: and (3) carrying out surface sizing on the base paper by using a surface sizing solution, drying, press polishing and reeling to obtain the medical dialyzing paper.
Preferably, the beating degree in the process 1 is 18-230SR, the pulping power is 60-70 kw.
Preferably, the surface sizing solution in the process 3 is prepared from modified starch and polyvinyl alcohol.
More preferably, the surface sizing solution is prepared as follows:
adding 300-400 parts by weight of distilled water into a glue boiling pot, opening a stirrer, slowly adding 30-50 parts by weight of modified starch and 20-40 parts by weight of polyethanol, slowly heating to 80-90 ℃ after uniformly stirring, preserving heat for 20-30 min, then adding distilled water to dilute to a specified scale mark, uniformly stirring, and filtering to obtain the surface sizing solution, wherein the concentration of the sizing solution is 5.1-7.5%, and the use temperature is controlled at 60-70 ℃.
The invention adopts 3-acetoxyl group-3-methylpentane-1, 5-diacid anhydride to modify starch to obtain modified starch, and the modified starch is used as a sizing layer of medical dialyzing paper to prepare the medical dialyzing paper, thereby having the following beneficial effects: the medical dialyzing paper has high heat-seal strength, peeling strength and water resistance, and simultaneously has good air permeability, and the surface and the form of modified starch granules are changed to a certain extent; probably caused by the introduction of some active groups, the starch particles can be prevented from being aggregated to a certain extent, the starch particles can be uniformly dispersed in the emulsion, the emulsion has good fluidity, the physical and chemical properties of the starch are improved, the starch is used as a component of the sizing solution, the heat sealing strength and the peeling strength of the medical dialyzing paper and other film packaging materials are further improved, the water absorption of the medical dialyzing paper is reduced, the medical dialyzing paper has excellent water resistance, and the medical dialyzing paper has higher air permeability and bursting strength, so that various performance indexes of the medical dialyzing paper meet the use standard. Therefore, the heat-seal self-adhesive high-strength medical dialyzing paper has higher heat-seal strength, peel strength and bursting strength, and also has better air permeability and water resistance.
Drawings
FIG. 1 is an infrared spectrum of starch before and after modification;
FIG. 2 is a graph showing the heat-seal strength of the heat-seal self-adhesive medical dialyzing paper;
FIG. 3 is a graph showing the peel strength of the heat-seal self-adhesive medical dialyzing paper;
FIG. 4 is a water absorption property of the heat-seal self-adhesive type medical dialyzing paper;
FIG. 5 is an air permeability of the heat-seal self-adhesive medical dialyzing paper;
fig. 6 is a graph showing the bursting strength of the heat-seal self-adhesive medical dialyzing paper.
Detailed Description
In some specific embodiments of the present invention, the modified starch is prepared by the following method:
the preparation method comprises the steps of putting cassava starch into distilled water to prepare starch milk with the concentration of 25wt%, carrying out constant-temperature water bath at 45 ℃, adding 3-acetoxyl-3-methylpentane-1, 5-diacid anhydride, wherein the weight of the 3-acetoxyl-3-methylpentane-1, 5-diacid anhydride is 3.5% of that of the cassava starch, adjusting the pH of a system to be 8.2 by using 5% NaOH, adjusting the pH of the system to be 6.3 by using 1.2mol/L hydrochloric acid solution after reaction is finished, washing the system for 3 times by using ethanol, drying the system at 50 ℃, crushing the system, and sieving the dried system to obtain the modified starch.
The technical solution of the present invention is further described in detail below with reference to the following detailed description and the accompanying drawings:
example 1
A processing method of heat-seal self-adhesive high-strength medical dialyzing paper comprises the following steps:
the process 1 comprises the following steps: beating 75 weight portions of plant fiber into paper pulp, wherein the needle leaves in the plant fiberThe weight ratio of wood fiber to broadleaf wood fiber is 3:1, the beating degree is 220SR, pulping power is 60W, then adding 1.3 parts by weight of PPE wet strength agent and 1.0 part by weight of chemical additive, wherein the weight ratio of AKD to triptolide triol in the chemical additive is 1:0.3, and obtaining mixed paper pulp;
and (2) a process: making the mixed paper pulp on a fourdrinier papermaking machine to prepare base paper;
and (3) a process: and (3) carrying out surface sizing on the base paper by using a surface sizing solution with the concentration of 5.5% to form a sizing layer, wherein the weight of the sizing layer is 2.1% of the weight of the base paper, and drying, calendaring and reeling to obtain the medical dialyzing paper.
In this example, the preparation method of the surface sizing solution is as follows:
adding 300 parts by weight of distilled water into a glue boiling pot, opening a stirrer, slowly adding 35 parts by weight of modified starch and 20 parts by weight of polyethanol, uniformly stirring, slowly heating to 80 ℃, keeping the temperature for 20min, then adding distilled water to dilute to a specified scale mark, uniformly stirring, and filtering to obtain the surface sizing solution.
Example 2
A processing method of heat-seal self-adhesive high-strength medical dialyzing paper comprises the following steps:
the process 1 comprises the following steps: beating 85 weight parts of plant fiber into paper pulp, wherein the weight ratio of softwood fiber to hardwood fiber in the plant fiber is 4:1, and the beating degree is 200SR, the pulping power is 65W, then 0.9 weight part of PPE wet strength agent and 0.6 weight part of chemical additive are added, wherein the weight ratio of AKD to triptolide triol in the chemical additive is 1:0.5, and mixed paper pulp is obtained;
and (2) a process: making the mixed paper pulp on a fourdrinier papermaking machine to prepare base paper;
and (3) a process: and (3) carrying out surface sizing on the base paper by using a surface sizing solution with the concentration of 6.5% to form a sizing layer, wherein the weight of the sizing layer is 2.8% of the weight of the base paper, and drying, calendaring and reeling to obtain the medical dialyzing paper.
In this example, the preparation method of the surface sizing solution is as follows:
adding 350 parts by weight of distilled water into a glue boiling pot, opening a stirrer, slowly adding 40 parts by weight of modified starch and 30 parts by weight of polyethanol, uniformly stirring, slowly heating to 85 ℃, keeping the temperature for 25min, then adding distilled water to dilute to a specified scale mark, uniformly stirring, and filtering to obtain the surface sizing solution.
Example 3
The other steps of the processing method of the heat-seal self-adhesive high-strength medical dialyzing paper are the same as those of the embodiment 2, and are different from the embodiment 2 in that:
the process 1 comprises the following steps: beating 90 weight portions of plant fiber into paper pulp, wherein the weight ratio of softwood fiber to hardwood fiber in the plant fiber is 2.5:1, and the beating degree is 180SR, pulping power is 70W, then adding 1.5 parts by weight of PPE wet strength agent and 1.2 parts by weight of chemical additive, wherein the weight ratio of AKD to triptolide triol in the chemical additive is 1:0.5, and obtaining mixed paper pulp.
Example 4
The other steps of the processing method of the heat-seal self-adhesive high-strength medical dialyzing paper are the same as those of the embodiment 2, and are different from the embodiment 2 in that:
and (3) a process: and (3) carrying out surface sizing on the base paper by using a surface sizing solution with the concentration of 7% to form a sizing layer, wherein the weight of the sizing layer is 3.5% of the weight of the base paper, and drying, calendaring and reeling to obtain the medical dialyzing paper.
In this example, the preparation method of the surface sizing solution is as follows:
adding 400 parts by weight of distilled water into a glue boiling pot, opening a stirrer, slowly adding 50 parts by weight of modified starch and 40 parts by weight of polyethanol, uniformly stirring, slowly heating to 90 ℃, keeping the temperature for 30min, then adding distilled water to dilute to a specified scale mark, uniformly stirring, and filtering to obtain the surface sizing solution.
Example 5
The other steps of the processing method of the heat-seal self-adhesive high-strength medical dialyzing paper are the same as those of the embodiment 2, and are different from the embodiment 2 in that:
the process 1 comprises the following steps: calculated by weight portion, 85 weight portionsPulping the plant fiber into paper pulp, wherein the weight ratio of softwood fiber to hardwood fiber in the plant fiber is 4:1, and the pulping degree is 200SR, the beating power is 65W, and then 0.9 weight part of PPE wet strength agent and 0.6 weight part of AKD are added to obtain mixed paper pulp.
Comparative example 1
The other steps of the processing method of the heat-seal self-adhesive high-strength medical dialyzing paper are the same as those of the embodiment 2, and are different from the embodiment 2 in that:
and (3) a process: and (3) carrying out surface sizing on the base paper by using a surface sizing solution with the concentration of 6.5% to form a sizing layer, wherein the weight of the sizing layer is 2.8% of the weight of the base paper, and drying, calendaring and reeling to obtain the medical dialyzing paper.
In this example, the preparation method of the surface sizing solution is as follows:
adding 350 parts by weight of distilled water into a glue boiling pot, opening a stirrer, slowly adding 40 parts by weight of starch and 30 parts by weight of polyethanol, uniformly stirring, slowly heating to 85 ℃, keeping the temperature for 25min, then adding distilled water to dilute to a specified scale mark, uniformly stirring, and filtering to obtain the surface sizing solution.
Comparative example 2
A processing method of heat-seal self-adhesive high-strength medical dialyzing paper comprises the following steps:
the process 1 comprises the following steps: beating 85 weight parts of plant fiber into paper pulp, wherein the weight ratio of softwood fiber to hardwood fiber in the plant fiber is 4:1, and the beating degree is 200SR, the pulping power is 65W, and then 0.9 weight part of PPE wet strength agent and 0.6 weight part of AKD are added to obtain mixed paper pulp;
and (2) a process: making the mixed paper pulp on a fourdrinier papermaking machine to prepare base paper;
and (3) a process: and (3) carrying out surface sizing on the base paper by using a surface sizing solution with the concentration of 6.5% to form a sizing layer, wherein the weight of the sizing layer is 2.8% of the weight of the base paper, and drying, calendaring and reeling to obtain the medical dialyzing paper.
In this example, the preparation method of the surface sizing solution is as follows:
adding 350 parts by weight of distilled water into a glue boiling pot, opening a stirrer, slowly adding 40 parts by weight of starch and 30 parts by weight of polyethanol, uniformly stirring, slowly heating to 85 ℃, keeping the temperature for 25min, then adding distilled water to dilute to a specified scale mark, uniformly stirring, and filtering to obtain the surface sizing solution.
Test example 1
1. Determination of modified starch Infrared Spectroscopy
In the test, a sample to be analyzed and potassium bromide are placed in an oven, dried for 48 hours at 120 ℃, and stored in a dryer for later use; weighing 1mg sample by potassium bromide tabletting method, grinding in agate mortar under irradiation of infrared lamp for about 5min, mixing with about 100mg dry potassium bromide powder, grinding for 5min, pouring the ground mixture powder on parchment paper, pouring into a press mold, and vacuum-pressing for several mm Hg to about 5t/cm2And (3) pressing and forming under pressure, taking out the thin sheet, putting the thin sheet on a sample rack, and placing the sample rack in an infrared spectrometer for full-wave-band scanning.
FIG. 1 shows the IR spectra of starch before and after modification. As can be seen from FIG. 1, the modified starch has an IR spectrum of 3386cm relative to the IR spectrum of the unmodified starch-1The variable intensity of a characteristic absorption peak which appears nearby and is caused by stretching vibration generated by carboxyl hydroxyl in the modified starch; at 1763cm-1A strong characteristic absorption peak appears nearby, and the peak is stretching vibration of the ester group; at 1738cm-1A strong characteristic absorption peak appears nearby, which is the stretching vibration of carbonyl; at 1450cm-1The characteristic absorption peak in the vicinity of the peak has a variable intensity, which is-CH in 3-acetoxy-3-methylpentane-1, 5-dicarboxylic anhydride3The stretching vibration of (2); thus, it was found that modified starch was obtained by modifying starch with 3-acetoxy-3-methylpentane-1, 5-dioic acid anhydride.
Test example 2
1. Determination of heat-seal strength of heat-seal self-adhesive medical dialyzing paper
In the test, a Labthink HST-H2 heat-seal tester and an ALW (L) PC intelligent electronic tension tester are adopted to detect the heat-seal strength of the test sample.
Fig. 2 shows the heat-seal strength of the heat-seal self-adhesive medical dialyzing paper. As can be seen from FIG. 2, the heat seal strengths of examples 1 to 4 are higher than 2.3kN/m, the heat seal strengths of comparative example 2 and comparative example 1, example 5 and comparative example 2, the heat seal strength of example 2 is higher than that of comparative example 1, and the heat seal strength of example 5 is higher than that of comparative example 2, which shows that the heat seal strength of the medical dialyzing paper is improved by modifying starch with 3-acetoxy-3-methylpentane-1, 5-diacid anhydride to obtain modified starch, and using the modified starch as a sizing component of the medical dialyzing paper; the heat seal strength of example 5 is higher than 2.1kN/m, the heat seal strength of comparative example 2 and example 5, the heat seal strength of comparative example 1 and comparative example 2, the heat seal strength of example 2 is higher than that of example 5, and the heat seal strength of comparative example 1 is higher than that of comparative example 2, which shows that the addition of triptolide triol during the preparation of the medical dialyzing paper improves the heat seal strength of the medical dialyzing paper; comparing example 2 with comparative example 2, the heat seal strength of example 2 is significantly higher than that of comparative example 2, which shows that the heat seal strength of the medical dialyzing paper is significantly improved by adding the modified starch and the triptolide triol into the medical dialyzing paper.
2. Determination of peel strength of heat-seal self-adhesive medical dialyzing paper
Cutting sample paper into size of 30cm × 30cm, cutting blue PE film with size same as paper pattern, combining heat-sealing surface of the blue PE film with back surface of the paper, sealing in longitudinal and transverse directions in a paper plastic sealing machine at 180 deg.C and under certain sealing pressure, and cooling; 5 groups of longitudinally and transversely sealed samples are cut, each sample is 15 +/-0.1 mm wide and long enough, the peel strength is measured in a vertical computer tensile tester, the sealing surface is peeled at the speed of 200mm/min +/-10 mm/min, and the maximum force is recorded.
Fig. 3 shows the peel strength of the heat-seal self-adhesive medical dialyzing paper. As can be seen from FIG. 3, the longitudinal peel strength of examples 1 to 4 is higher than 5.95N, the transverse peel strength is higher than 4.2N, the longitudinal and transverse peel strength of comparative example 2 and comparative example 1 are higher than that of comparative example 1, and this shows that the peel strength of the medical dialyzing paper is improved by modifying starch with 3-acetoxy-3-methylpentane-1, 5-diacid anhydride to obtain modified starch, and using the modified starch as a sizing component of the medical dialyzing paper; comparing example 2 with example 5, comparing example 1 with comparative example 2, the longitudinal and transverse peel strengths of example 5 are not obviously different from example 2, and the longitudinal and transverse peel strengths of comparative example 2 are not obviously different from comparative example 1, which shows that the addition of triptolide triol in the process of preparing the medical dialyzing paper has almost no influence on the peel strength of the medical dialyzing paper.
3. Measurement of Water absorbability of Heat-seal self-adhesive medical dialyzing paper
The water absorption of the test specimen was determined in accordance with the relevant national standard and satisfied a water absorption of < 22 on the front side and < 22 on the back side.
Fig. 4 shows water absorption of the heat-seal self-adhesive medical dialyzing paper. As can be seen from FIG. 4, the front side water absorbencies of examples 1 to 4 were less than 17g/m2Water absorption of the reverse side is lower than 18g/m2Comparing example 2 with comparative example 1, comparing example 5 with comparative example 2, wherein the water absorption of the front and back surfaces of example 2 is lower than that of comparative example 1, and the water absorption of the front and back surfaces of example 5 is lower than that of comparative example 2, which shows that the modified starch obtained by modifying the starch with 3-acetoxy-3-methylpentane-1, 5-diacid anhydride is used as the sizing component of the medical dialyzing paper, so that the water absorption of the medical dialyzing paper is reduced, even if the medical dialyzing paper has excellent water resistance; comparing example 2 with example 5, comparing example 1 with comparative example 2, and comparing example 5 with example 2, the water absorbencies of the front and back sides are not obviously different from example 2, and the water absorbencies of the front and back sides of comparative example 2 are also not obviously different from comparative example 1, which shows that the addition of triptolide triol in the process of preparing the dialysis paper has no obvious influence on the water absorption of the medical dialysis paper.
4. Determination of air permeability of heat-sealing self-adhesive medical dialyzing paper
The water absorption of the test specimen was determined according to the corresponding national standard and satisfied an air permeability of > 3.4 μm/pas.
Fig. 5 shows the air permeability of the heat-seal self-adhesive medical dialyzing paper. As can be seen from FIG. 5, the air permeabilities of examples 1 to 4 are higher than 9 μm/pas, the air permeabilities of comparative example 2 and comparative example 1, example 5 and comparative example 2, example 2 is higher than comparative example 1, and example 5 is higher than comparative example 2, which shows that the air permeabilities of the medical dialyzing paper are improved by modifying starch with 3-acetoxy-3-methylpentane-1, 5-dioic acid anhydride to obtain modified starch, which is used as a sizing component of the medical dialyzing paper; comparing example 2 with example 5, comparative example 1 with comparative example 2, the air permeability of example 2 is higher than that of example 5, and the air permeability of comparative example 1 is higher than that of comparative example 2, which shows that the addition of triptolide triol during the preparation of the dialysis paper further improves the air permeability of the medical dialysis paper.
5. Determination of heat-sealing self-adhesive medical dialyzing paper bursting strength
The water absorption of the test sample is determined according to corresponding national standards, and the bursting strength is more than or equal to 230 Kpa.
Fig. 6 is a graph showing the bursting strength of the heat-seal self-adhesive medical dialyzing paper. As can be seen from FIG. 6, the burst strengths of examples 1 to 4 were not less than 245Kpa, and the use criteria were satisfied; comparing comparative example 2 with comparative example 1, example 5 with comparative example 2, the bursting strength of example 2 is not obviously different from that of comparative example 1, and the bursting strength of example 5 is not obviously different from that of comparative example 2, which shows that the modified starch obtained by modifying starch with 3-acetoxy-3-methylpentane-1, 5-diacid anhydride has no great influence on medical dialyzing paper when being used as a sizing component of the medical dialyzing paper; comparing example 2 with example 5, comparative example 1 with comparative example 2, the burst strength of example 2 is higher than that of example 5, and the burst strength of comparative example 1 is higher than that of comparative example 2, which shows that the medical dialyzing paper has higher burst strength by adding triptolide triol during the preparation of dialyzing paper.
Conventional operations in the operation steps of the present invention are well known to those skilled in the art and will not be described herein.
The above embodiments are merely illustrative, and not restrictive, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (10)
1. The utility model provides a medical dialyzing paper of heat-seal self-adhesion type high strength which characterized in that: the medical dialyzing paper consists of base paper and a sizing layer coated on the surface of the base paper;
the raw paper contains plant fiber, adhesive and chemical additive;
the sizing layer contains modified starch;
the modified starch is prepared from 3-acetoxyl-3-methylpentane-1, 5-diacid anhydride modified starch.
2. The heat-seal self-adhesive high-strength medical dialyzing paper according to claim 1, characterized in that: in the raw paper components, by weight, 75-90 parts of plant fibers, 0.6-1.5 parts of adhesive and 0.3-1.2 parts of chemical additive are added.
3. The heat-seal self-adhesive high-strength medical dialyzing paper according to claim 1 or 2, characterized in that: the plant fiber is needle wood fiber and broad leaf wood fiber.
4. The heat-seal self-adhesive high-strength medical dialyzing paper according to claim 3, characterized in that: in the plant fibers, the weight ratio of the softwood fibers to the hardwood fibers is 2.5-4.5: 1.
5. The heat-seal self-adhesive high-strength medical dialyzing paper according to claim 1, characterized in that: the adhesive is PPE wet strength agent.
6. The heat-seal self-adhesive high-strength medical dialyzing paper according to claim 1, characterized in that: the chemical additive contains AKD and triptolide triol.
7. The heat-seal self-adhesive high-strength medical dialyzing paper according to claim 1, characterized in that: the sizing layer component also comprises one or a mixture of polyvinyl alcohol and petroleum resin.
8. The heat-seal self-adhesive high-strength medical dialyzing paper according to claim 1, characterized in that: the weight of the sizing layer is 1.8-3.5% of the weight of the base paper.
9. The method for processing the heat-seal self-adhesive high-strength medical dialyzing paper of claim 1, which comprises the following steps:
the process 1 comprises the following steps: pulping the plant fibers to form paper pulp, and then adding an adhesive and a chemical additive to obtain mixed paper pulp;
and (2) a process: manufacturing the mixed paper pulp on a fourdrinier papermaking machine to prepare base paper;
and (3) a process: and (3) carrying out surface sizing on the base paper by using a surface sizing solution, drying, calendaring and reeling to obtain the medical dialyzing paper.
10. The processing method of the heat-seal self-adhesive high-strength medical dialyzing paper according to claim 9, characterized in that: the surface sizing solution in the process 3 is prepared from modified starch and polyvinyl alcohol.
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| CN114622436A (en) * | 2022-04-25 | 2022-06-14 | 浙江科技学院 | Method for enhancing mechanical properties of nano dialysis paper for high-resistance bacteria medical protection in environment-friendly manner |
| US11840806B2 (en) | 2022-04-25 | 2023-12-12 | Zhejiang University Of Science And Technology | Environmentally-friendly method for enhancing mechanical properties of high antibacterial nano dialysis paper for medical protection |
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