A fiber pretreatment method for dialysis paper and dialysis paper

Abstract

The present invention belongs to the technical field of the preparation of medical dialysis paper, and particularly relates to a method for pre-treating fibers for dialysis paper and a dialysis paper. The method for pre-treating fibers for dialysis paper includes the steps: S1, after subjecting softwood fibers to alkali treatment, placing them in a microwave oven for microwave expansion treatment; S2, mixing kapok fibers with the softwood fibers treated in step S1, then putting them into an appropriate amount of non-polar solvent for soaking, and then fishing them out and draining; S3, mixing chemical fibers with the fibers treated in step S2, spraying an appropriate amount of surface treatment agent solution, stirring to make the mixture uniform, and then placing it in an oven for drying to obtain the pre-treated fibers for dialysis paper. The dialysis paper prepared from the fibers treated by the method for pre-treating fibers for dialysis paper of the present invention has the advantages of high strength and good air permeability.

Description

Technical Field

[0001] The present invention belongs to the technical field of the preparation of medical dialysis paper, and particularly relates to a method for pre-treating fibers for dialysis paper and a dialysis paper. Background Art

[0002] Medical device sterilization packaging (referred to as medical packaging for short) refers to a packaging system applied to medical devices that need to be sterilized. It can be sterilized after packaging and provide bacteriostatic protection for medical devices before use. The scenarios involved include the sterilization after packaging of products by disposable sterile medical device manufacturers, and the sterilization storage for repeated use after packaging and sealing of medical devices by hospital disinfection supply centers for next use. Compared with the traditional method of repackaging after sterilization, medical device sterilization packaging strengthens the control of the sufficiency of medical device sterilization and the risk of contamination in the whole process of transportation, storage, and use, and the safety of use is significantly improved.

[0003] Among them, the most common medical device sterilization packaging material is medical dialysis paper, which has the characteristics of low price and convenient use. It can be heat-sealed or adhesively sealed with film materials such as PE and PP, and is often used as the sterilization packaging material for medical devices in the medical packaging industry. Compared with fully plastic packaging bags, paper bags made of medical dialysis paper have two major advantages: one is environmental protection; the other is safety and hygiene. For example, paper-plastic packaging bags can achieve sterilization after device packaging, reducing the intermediate links in direct contact with the device, which is impossible for fully plastic packaging. Therefore, paper-plastic packaging is safer for patients, and at the same time, medical staff will not be harmed by the possible residual disinfection drugs in the bag after unpacking the device.

[0004] When producing medical dialysis paper, there are high requirements for the performance of the paper, such as specific requirements for paper strength, bacteriostatic property, air permeability, etc. Therefore, the preparation of medical dialysis paper is difficult. Currently, the performance of domestic paper is poor, and high-end medical dialysis paper mostly relies on imports. However, the price of imported paper from abroad can reach about five times that of domestic paper, which greatly restricts the application of medical dialysis paper. The localization of high-performance medical dialysis paper is of great significance for promoting the development of China's medical industry.

[0005] Among the many performance requirements of medical dialysis paper, paper air permeability is a very important performance index and also a technical lowland of domestic paper at present. This is because the current domestic sterilization methods for sterilization packaging materials are mainly ETO ethylene oxide sterilization method and high-temperature and high-humidity steam method. The sterilization effect and sterilization rate of these two sterilization methods highly depend on the air permeability of the paper. They require the paper to have a certain air permeability and at the same time have a small pore size, so that the prepared sterilization packaging can block bacteria and dust from entering, but allow ethylene oxide gas or steam to pass through, achieving the purpose of sterilizing the packaged medical devices and items.

[0006] The fineness, length, morphology, surface properties, dispersion degree, etc. of the fibers that make up the paper all have a direct impact on the air permeability of the paper. Therefore, providing a fiber pretreatment method for dialysis paper to obtain medical dialysis paper with high air permeability is one of the technical problems that need to be solved urgently by those skilled in the art. Summary of the Invention

[0007] The purpose of the present invention is to provide a fiber pretreatment method for dialysis paper and dialysis paper to obtain medical dialysis paper with high air permeability through the pretreatment of fibers in view of the above-mentioned existing technical problems.

[0008] In view of this, the present invention provides a fiber pretreatment method for dialysis paper. By weight, the fibers for dialysis paper include:

[0009] 20 - 30 parts of chemical fiber;

[0010] 50 - 60 parts of softwood fiber;

[0011] 80 - 90 parts of kapok fiber.

[0012] Further, the fineness of the chemical fiber is 0.05 - 0.3 dtex, and the length is 3 - 5 mm. The chemical fiber is one or more of polyester fiber, polyamide fiber, and polylactic acid fiber.

[0013] Further, the kapok fiber is natural kapok fiber.

[0014] Further, the fiber pretreatment method for dialysis paper includes the steps:

[0015] S1, after alkali - treating the softwood fiber, place it in a microwave oven for microwave expansion treatment;

[0016] S2, mix the kapok fiber with the softwood fiber treated in step S1, then put it into an appropriate amount of non - polar solvent for soaking, and then fish it out and drain;

[0017] S3, mix the chemical fiber and the fiber treated in step S2, spray an appropriate amount of surface treatment agent solution, stir to make it evenly mixed, and then place it in an oven for drying to obtain the pretreated fibers for dialysis paper.

[0018] Further, step S1 includes:

[0019] S11, alkali - treatment: Put the softwood fiber into a 3 - 5% alkali solution and soak it at room temperature for 10 - 20 h, then rinse it with water until neutral and dry it for standby;

[0020] S12, Microwave expansion: Mix the alkali-treated softwood fibers and ammonium carbamate powder, stir evenly, then place them in a microwave oven and perform microwave expansion treatment at a power of 300 - 600 W and 2000 - 3000 Hz for 60 - 100 s;

[0021] S13, Water washing: Rinse the decomposition residues of ammonium carbamate in the softwood fibers with water 2 - 3 times, then fish them out and dry.

[0022] Further, the step S2 includes:

[0023] First, mix the kapok fibers with the softwood fibers treated in step S1, then put them into a non-polar solvent 3 - 5 times the total amount of kapok fibers and softwood fibers, soak at room temperature for 1 - 2 h, then fish them out and drain.

[0024] Further, in step S2, after the kapok fibers and softwood fibers soaked in the non-polar solvent are completed, fish them out and drain until the content of the non-polar solvent in the kapok fibers and softwood fibers is between 50 - 80%.

[0025] Further, in step S3, the surface treatment agent solution includes surface treatment solution A and surface treatment agent solution B;

[0026] The preparation process of the surface treatment solution A is as follows: First, prepare a dopamine hydrochloride solution with a concentration of 3 - 8 g / L, then add a certain amount of polyvinyl alcohol to the dopamine hydrochloride solution, stir until dissolved, and obtain the surface treatment solution A; wherein, the addition amount of the polyvinyl alcohol is 1.5 - 3 g / L;

[0027] The preparation process of the surface treatment solution B is as follows: Put sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium lauryl ether sulfate, and silane coupling agent into water, stir evenly, and obtain the surface treatment solution B; wherein, the contents of sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium lauryl ether sulfate, and silane coupling agent in the surface treatment solution B are 0.2 - 0.5 g / L, 0.5 - 1 g / L, 0.1 - 0.3 g / L, and 2 - 5 g / L respectively.

[0028] Further, the spraying method of the surface treatment solution A and the surface treatment agent solution B is:

[0029] First, spray the surface treatment solution A on the surface of the mixed fibers, stir to make them evenly mixed, then let them stand at room temperature for 1 - 3 h, then spray the surface treatment agent solution B on the surface of the mixed fibers, stir to make them evenly mixed, and then place them in an oven and dry at 100 - 120 °C to obtain the fibers for pretreated dialysis paper.

[0030] A dialysis paper, which is prepared from fibers treated by the fiber pretreatment method for dialysis paper as described above.

[0031] The beneficial effects of the present invention are as follows:

[0032] In the fiber pretreatment method for dialysis paper of the present invention, by subjecting softwood fibers to alkali treatment, pectin, starch and sugars in the fibers can be removed, providing favorable conditions for subsequent microwave expansion treatment; and through the subsequent microwave expansion treatment, the softwood fibers can be uniformly heated in a short time by using microwaves. Due to the dielectric property that polar water molecules inside the softwood fibers can strongly absorb microwaves, when heated by microwave radiation, they collide and rub violently with the microwave frequency, generating a large amount of heat, thereby causing the water to rapidly volatilize and generating a vapor pressure. The vapor is rapidly released from the inside of the softwood fibers to the outside, causing the space inside the softwood fibers to rapidly expand. Finally, countless cracks and microvoids are formed on the fiber surface, but the size of these cracks and microvoids is extremely small, and the influence on the fiber strength is also relatively low. Therefore, the softwood fibers can still remain in a relatively high strength range. At the same time, during the microwave expansion treatment, ammonium carbamate can decompose to produce ammonia, water vapor, etc., and the gas can be used to open the pores inside the softwood fibers and further expand the volume of the fibers, thereby obtaining softer and more porous softwood fibers, which is beneficial to improving the air permeability of the prepared dialysis paper.

[0033] After mixing kapok fibers and softwood fibers, by soaking them in a non-polar solvent, the non-polar solvent can be inhaled into the fibers. By using the non-polar solvent to fill the internal pores of the fibers, when the surface treatment agent solution is sprayed later, since water and the non-polar solvent are incompatible, the surface treatment agent solution is not easily introduced into the internal pores of the fibers to block the internal pores of the fibers, but more adheres to the fiber surface. Subsequently, the non-polar solvent inside the fibers can be removed by evaporation and other methods, which can not only improve the air permeability of the prepared dialysis paper, but also improve the effect of the surface treatment agent solution.

[0034] In the surface treatment agent solution used in the present invention, dopamine hydrochloride solution, polyvinyl alcohol and silane coupling agent can improve the surface activity of the fibers and enhance their ability to composite with other substances. Sodium dodecylbenzenesulfonate can promote the dissolution of the non-polar solvent inside the fibers, and sodium hexametaphosphate and fatty alcohol ether sulfate can promote the dispersion of the fibers to obtain a dialysis paper with uniform texture. Detailed implementation mode

[0035] The technical solutions in the embodiments of the present application will be clearly described below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0036] It should be noted that in this application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of this application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0037] A method for pre-treating fibers for dialysis paper, by weight parts, the fibers for dialysis paper include:

[0038] 20 - 30 parts of chemical fibers;

[0039] 50 - 60 parts of coniferous fibers;

[0040] 80 - 90 parts of kapok fibers.

[0041] Preferably, the fineness of the chemical fibers is 0.05 - 0.3 dtex and the length is 3 - 5 mm.

[0042] As some embodiments of the present invention, the chemical fibers are one or more of polyester fibers, polyamide fibers, and polylactic acid fibers.

[0043] As some embodiments of the present invention, the coniferous fibers are fibers taken from trees such as pine, cypress, and spruce.

[0044] Preferably, the kapok fibers are natural kapok fibers.

[0045] The fibers used in the present invention are a mixture of chemical fibers, coniferous fibers, and kapok fibers. Among them, the chemical fibers have a small fineness but high strength and can be used as the framework fibers to provide higher mechanical strength for the dialysis paper. The coniferous fibers have a longer fiber length, a thicker cell wall in the fibers, and contain a higher cellulose and lignin content, which can make the produced paper relatively firm and strong. They can be used as the main component of the reticular structure for preparing the dialysis paper and can provide better mechanical strength and air permeability for the dialysis paper. The kapok fibers have a long length, about 10 - 40 mm, a fine fineness, usually only 0.2 - 0.5 times that of cotton fibers, but the kapok fibers have an extremely high hollowness rate, about more than 86%, which is 2 - 3 times that of cotton fibers. In the present invention, the kapok fibers are used to prepare the dialysis paper and can be used as the main filling material to provide higher air permeability and antibacterial property for the dialysis paper.

[0046] Further, the fiber pretreatment method for the dialysis paper includes the steps:

[0047] S1, After alkali - treating the coniferous fibers, place them in a microwave oven for microwave expansion treatment;

[0048] S2, Mix the kapok fibers with the coniferous fibers treated in step S1, then put them into an appropriate amount of non - polar solvent for soaking, and then take them out and drain;

[0049] S3, Mix the chemical fibers and the fibers treated in step S2, spray an appropriate amount of surface treatment agent solution, stir to make them evenly mixed, and then place them in an oven for drying to obtain the pretreated fibers for the dialysis paper.

[0050] Even further, the step S1 includes:

[0051] S11, Alkali treatment: Put the coniferous fibers into a 3 - 5% alkali solution and soak them at room temperature for 10 - 20 h, then rinse them with water until neutral and dry them for standby;

[0052] S12, Microwave expansion: Mix the alkali - treated coniferous fibers with ammonium carbamate powder, stir evenly, then place them in a microwave oven, and carry out microwave expansion treatment at a power of 300 - 600 W and a frequency of 2000 - 3000 Hz for 60 - 100 s;

[0053] S13, Water washing: Rinse the decomposition residues of ammonium carbamate in the coniferous fibers 2 - 3 times with water, then take them out and dry.

[0054] Preferably, in the step S21, the alkali solution is an aqueous sodium hydroxide solution, and the dosage of the alkali solution is 50 - 100 times the weight of the coniferous fibers.

[0055] Preferably, in the step S21, the water content of the dried coniferous fibers is 80% - 90%.

[0056] Preferably, in the step S22, the particle size of the ammonium carbamate powder is ≤10 μm, and preferably, the particle size of the ammonium carbamate powder is ≤1 μm.

[0057] Preferably, in the step S22, the dosage of the ammonium carbamate powder is 1 to 5 times the weight of the needle-shaped fiber.

[0058] Preferably, in the step S23, when performing the microwave expansion treatment, the temperature of the needle-shaped fiber is controlled not to exceed 90°C.

[0059] Preferably, in the step S23, the needle-shaped fiber can be laid flat in the microwave oven for microwave expansion treatment, and the laying thickness does not exceed 3 - 5 mm.

[0060] Furthermore, the step S2 includes:

[0061] First, mix the kapok fiber with the needle-shaped fiber treated in the step S1, and then put it into a non-polar solvent 3 to 5 times the total weight of the kapok fiber and the needle-shaped fiber, soak it at room temperature for 1 to 2 h, and then take it out and drain it.

[0062] As some embodiments of the present invention, the diffusion of the non-polar solvent into the fiber can also be accelerated by pressurizing or heating the soaking, for example, the kapok fiber and the needle-shaped fiber put into the non-polar solvent can be soaked at 2 - 3 MPa for 10 - 30 min, and then taken out and drained. Or, the kapok fiber and the needle-shaped fiber put into the non-polar solvent can be soaked at 40 - 60°C for 20 - 40 min, and then taken out and drained.

[0063] As some embodiments of the present invention, in the step S2, the non-polar solvent is selected from one or more of cyclohexane, chloroform, benzene, ether, etc.

[0064] Preferably, in the step S2, after the kapok fiber and the needle-shaped fiber put into the non-polar solvent are soaked, take them out and drain them until the content of the non-polar solvent in the kapok fiber and the needle-shaped fiber is between 50 - 80% is appropriate.

[0065] Preferably, in the step S3, the surface treatment agent solution includes surface treatment solution A and surface treatment agent solution B, the spraying amount of the surface treatment solution A is 0.3 - 0.5 times the total weight of the chemical fiber, the needle-shaped fiber, and the kapok fiber, and the spraying amount of the surface treatment agent solution B is 0.5 - 1 times the total weight of the chemical fiber, the needle-shaped fiber, and the kapok fiber.

[0066] Further, the preparation process of the surface treatment solution A is as follows:

[0067] First, prepare a dopamine hydrochloride solution with a concentration of 3 - 8 g / L. Then, add a certain amount of polyvinyl alcohol to the dopamine hydrochloride solution and stir until it dissolves to obtain the surface treatment solution A. Among them, the addition amount of polyvinyl alcohol is 1.5 - 3 g / L.

[0068] Furthermore, the preparation process of the surface treatment solution B is as follows: Put sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium lauryl ether sulfate, and silane coupling agent into water and stir evenly to obtain the surface treatment solution B. Among them, the contents of sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium lauryl ether sulfate, and silane coupling agent in the surface treatment solution B are 0.2 - 0.5 g / L, 0.5 - 1 g / L, 0.1 - 0.3 g / L, and 2 - 5 g / L respectively.

[0069] Even further, the spraying methods of the surface treatment solution A and the surface treatment solution B are as follows:

[0070] First, spray the surface treatment solution A on the surface of the mixed fibers, stir to make them evenly mixed, and then let it stand at room temperature for 1 - 3 h. Then, spray the surface treatment solution B on the surface of the mixed fibers, stir to make them evenly mixed, and then place them in an oven and dry at 100 - 120 °C to obtain the fibers for pretreated dialysis paper.

[0071] In the method for pretreating fibers for dialysis paper of the present invention, by alkali - treating the softwood fibers, pectin, starch, and sugars in the fibers can be removed, providing favorable conditions for subsequent microwave expansion treatment. And through the subsequent microwave expansion treatment, the softwood fibers can be uniformly heated in a short time by microwave. Due to the strong dielectric property of polar water molecules inside the softwood fibers to strongly absorb microwaves, when heated by microwave radiation, they collide and rub violently with the microwave frequency, generating a large amount of heat, thus causing the water to rapidly volatilize and generating vapor pressure. The vapor is rapidly released from the inside of the softwood fibers to the outside, causing the space inside the softwood fibers to expand rapidly. Finally, numerous cracks and micro - gaps are formed on the fiber surface, but the size of these cracks and micro - gaps is extremely small, and the impact on the fiber strength is also relatively low. Therefore, the softwood fibers can still maintain a relatively high strength range. At the same time, during the microwave expansion treatment, ammonium carbamate can decompose to produce ammonia, water vapor, etc., and the gas can be used to open the pores inside the softwood fibers, further expanding the volume of the fibers, and thus obtaining softer and more porous softwood fibers, which is beneficial to improving the air permeability of the prepared dialysis paper.

[0072] After mixing kapok fibers and softwood fibers, by soaking them in a non-polar solvent, the non-polar solvent can be inhaled into the interior of the fibers. The non-polar solvent is used to fill the internal pores of the fibers. When spraying the surface treatment agent solution later, since water is incompatible with the non-polar solvent, the surface treatment agent solution is not easily introduced into the internal pores of the fibers to block the internal pores of the fibers. Instead, it adheres more to the fiber surface. Subsequently, the non-polar solvent inside the fibers can be removed by evaporation and other methods. This can not only improve the air permeability of the prepared dialysis paper but also improve the effect of the surface treatment agent solution.

[0073] In the surface treatment agent solution used in the present invention, the dopamine hydrochloride solution, polyvinyl alcohol, and silane coupling agent can improve the surface activity of the fibers and enhance their ability to compound with other substances. Sodium dodecylbenzenesulfonate can promote the dissolution of the non-polar solvent inside the fibers, and sodium hexametaphosphate and sodium lauryl ether sulfate can promote the dispersion of the fibers to obtain a dialysis paper with uniform texture.

[0074] The following uses specific examples to illustrate the fiber pretreatment method and dialysis paper of the present invention:

[0075] Example 1

[0076] Fiber pretreatment method for dialysis paper:

[0077] The fibers for dialysis paper include: 20 parts of chemical fibers; 50 parts of softwood fibers; 80 parts of kapok fibers; among them, the chemical fibers are polyester fibers;

[0078] Fiber pretreatment for dialysis paper:

[0079] Put the softwood fibers into a 3% NaOH solution with a weight 60 times that of the softwood fibers and soak them at room temperature for 10 h. After rinsing with water until neutral, dry them until the water content of the softwood fibers is 80%; mix the alkali-treated softwood fibers with ammonium carbamate powder with a weight 1 time that of the softwood fibers, stir evenly, and then place them in a microwave oven for microwave expansion treatment at a power of 600 W and 2800 Hz for 70 s; then rinse the decomposition residue of ammonium carbamate in the softwood fibers with water 2 times, and then fish them out and dry them to a constant weight;

[0080] Mix the kapok fibers with the softwood fibers treated in step S1, and then put them into cyclohexane, a non-polar solvent, with a weight 3 times the total amount of kapok fibers and softwood fibers, soak them at room temperature for 1 h, and then fish them out and drain until the content of the non-polar solvent in the kapok fibers and softwood fibers is between 50% and 60%;

[0081] Prepare a dopamine hydrochloride solution with a concentration of 3 g / L, and then add 3 g / L of polyvinyl alcohol to the dopamine hydrochloride solution. After stirring until dissolved, obtain surface treatment solution A;

[0082] Sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium fatty alcohol polyether sulfate, and silane coupling agent are added to water. After stirring evenly, the surface treatment solution B is obtained. Among them, the contents of sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium fatty alcohol polyether sulfate, and silane coupling agent in the surface treatment solution B are 0.2 g / L, 0.5 g / L, 0.1 g / L, and 5 g / L respectively;

[0083] First, the surface treatment solution A, which is 0.3 times the total weight of chemical fiber, coniferous fiber, and kapok fiber, is sprayed on the surface of the mixed fiber. After stirring to make it evenly mixed, it is left standing at room temperature for 3 h. Then, the surface treatment agent solution B, which is 1 times the total weight of chemical fiber, coniferous fiber, and kapok fiber, is sprayed on the surface of the mixed fiber. After stirring to make it evenly mixed, it is placed in an oven and dried to a constant weight at 100 °C to obtain the pretreated fiber for dialysis paper.

[0084] Example 2

[0085] Pretreatment method for fiber for dialysis paper:

[0086] The fiber for dialysis paper includes: 22 parts of chemical fiber; 55 parts of coniferous fiber; 83 parts of kapok fiber; among them, the chemical fiber is polyester fiber;

[0087] Pretreatment of fiber for dialysis paper:

[0088] The coniferous fiber is put into a 5% NaOH solution with a concentration 50 times the weight of the coniferous fiber and soaked at room temperature for 15 h. After rinsing with water until neutral, it is dried until the water content of the coniferous fiber is 84%. The alkali-treated coniferous fiber and ammonium carbamate powder, which is 3 times the weight of the coniferous fiber, are mixed. After stirring evenly, it is placed in a microwave oven and subjected to microwave expansion treatment at a power of 300 W and 3000 Hz for 100 s. Then, the decomposition residue of ammonium carbamate in the coniferous fiber is rinsed with water 2 times, and then fished out and dried to a constant weight;

[0089] The kapok fiber is mixed with the coniferous fiber treated in step S1, and then put into a non-polar solvent cyclohexane with a volume 4 times the total amount of kapok fiber and coniferous fiber, and soaked at room temperature for 1.5 h. Then, it is fished out and drained until the content of the non-polar solvent in the kapok fiber and coniferous fiber is between 60% and 65%;

[0090] A dopamine hydrochloride solution with a concentration of 5 g / L is prepared. Then, 2 g / L of polyvinyl alcohol is added to the dopamine hydrochloride solution. After stirring until dissolved, the surface treatment solution A is obtained;

[0091] Sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium lauryl ether sulfate, and silane coupling agent are added to water. After stirring evenly, the surface treatment solution B is obtained. Among them, the contents of sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium lauryl ether sulfate, and silane coupling agent in the surface treatment solution B are 0.3 g / L, 0.6 g / L, 0.2 g / L, and 3 g / L respectively;

[0092] First, the surface treatment solution A, which is 0.4 times the total weight of chemical fiber, coniferous fiber, and kapok fiber, is sprayed on the surface of the mixed fiber. After stirring to make it evenly mixed, it is left standing at room temperature for 2 h. Then, the surface treatment agent solution B, which is 0.7 times the total weight of chemical fiber, coniferous fiber, and kapok fiber, is sprayed on the surface of the mixed fiber. After stirring to make it evenly mixed, it is placed in an oven and dried to a constant weight at 110 °C to obtain the pretreated fiber for dialysis paper.

[0093] Example 3

[0094] Pretreatment method for fiber for dialysis paper:

[0095] The fiber for dialysis paper includes: 30 parts of chemical fiber; 60 parts of coniferous fiber; 90 parts of kapok fiber; among them, the chemical fiber is polyamide fiber;

[0096] Pretreatment of fiber for dialysis paper:

[0097] The coniferous fiber is put into a 3.5% NaOH solution with a weight 100 times that of the coniferous fiber and soaked at room temperature for 20 h. After being rinsed with water until neutral, it is dried until the water content of the coniferous fiber is 90%. The alkali-treated coniferous fiber and ammonium carbamate powder with a weight 5 times that of the coniferous fiber are mixed. After stirring evenly, it is placed in a microwave oven and subjected to microwave expansion treatment at a power of 400 W and 2000 Hz for 60 s. Then, the decomposition residue of ammonium carbamate in the coniferous fiber is rinsed with water 3 times, and then fished out and dried to a constant weight;

[0098] The kapok fiber is mixed with the coniferous fiber treated in step S1, and then put into chloroform, a non-polar solvent, with a weight 5 times the total amount of kapok fiber and coniferous fiber. It is soaked at room temperature for 2 h, and then fished out and drained until the content of the non-polar solvent in the kapok fiber and coniferous fiber is between 70% and 80%;

[0099] A dopamine hydrochloride solution with a concentration of 8 g / L is prepared, and then 1.5 g / L of polyvinyl alcohol is added to the dopamine hydrochloride solution. After stirring until dissolved, the surface treatment solution A is obtained;

[0100] Sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium alcohol ether sulfate, and silane coupling agent are put into water. After stirring evenly, the surface treatment solution B is obtained. Among them, the contents of sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium alcohol ether sulfate, and silane coupling agent in the surface treatment solution B are 0.5 g / L, 1 g / L, 0.3 g / L, and 2 g / L respectively;

[0101] First, spray 0.5 times the total weight of chemical fiber, coniferous fiber, and kapok fiber of the surface treatment solution A on the surface of the mixed fiber. After stirring to make it evenly mixed, let it stand at room temperature for 1 h. Then, spray 0.5 times the total weight of the chemical fiber, coniferous fiber, and kapok fiber of the surface treatment agent solution B on the surface of the mixed fiber. After stirring to make it evenly mixed, place it in an oven and dry it to constant weight at 120 °C to obtain the pretreated fibers for dialysis paper.

[0102] Example 4

[0103] Preparation of dialysis paper:

[0104] Beat an appropriate amount of the pretreated fibers for dialysis paper obtained in Example 2 above. The beating degree is 20 0 SR, and the beating concentration is 5%; add chemical aids to the pulp obtained by beating treatment. Add 10 kg of starch and 8 kg of ASA per ton of paper. Then, dilute the pulp to a fiber concentration of 0.5% and then carry out papermaking, shaping, and drying on the wire. After that, perform surface sizing on both sides of the paper. Among them, the surface sizing agent solution contains 10 parts by weight of starch, 5 parts by weight of AKD, and 85 parts by weight of water. After sizing, perform drying and calendering treatments to obtain medical dialysis paper.

[0105] Example 5

[0106] Preparation of dialysis paper:

[0107] Beat an appropriate amount of the pretreated fibers for dialysis paper obtained in Example 3 above. The beating degree is 20 0 SR, and the beating concentration is 8%; add chemical aids to the pulp obtained by beating treatment. Add 10 kg of starch and 8 kg of ASA per ton of paper. Then, dilute the pulp to a fiber concentration of 0.3% and then carry out papermaking, shaping, and drying on the wire. After that, perform surface sizing on both sides of the paper. Among them, the surface sizing agent solution contains 10 parts by weight of starch, 5 parts by weight of AKD, and 85 parts by weight of water. After sizing, perform drying and calendering treatments to obtain medical dialysis paper.

[0108] Comparative Example 1

[0109] Preparation of dialysis paper:

[0110] Mix 22 parts of untreated polyester fiber, 55 parts of coniferous fiber, and 83 parts of kapok fiber evenly and then beat them. The beating degree is 200 SR, beating consistency is 5%; chemical aids are added to the pulp obtained by beating treatment, 10 kg of starch and 8 kg of ASA are added per ton of paper. After that, the pulp is diluted to a fiber concentration of 0.5%, then it is sent to the wire for papermaking, shaping, and drying. Then, surface sizing is carried out on both sides of the paper. Among them, the surface sizing agent solution contains 10 parts by weight of starch, 5 parts by weight of AKD, and 85 parts by weight of water. After sizing, it is dried and calendered to obtain medical dialysis paper.

[0111] Comparative Example 2

[0112] Preparation of dialysis paper:

[0113] 30 parts of untreated polyamide fiber, 60 parts of softwood fiber, and 90 parts of kapok fiber are mixed evenly and then beaten, beating degree is 20 0 SR, beating consistency is 8%; chemical aids are added to the pulp obtained by beating treatment, 10 kg of starch and 8 kg of ASA are added per ton of paper. After that, the pulp is diluted to a fiber concentration of 0.3%, then it is sent to the wire for papermaking, shaping, and drying. Then, surface sizing is carried out on both sides of the paper. Among them, the surface sizing agent solution contains 10 parts by weight of starch, 5 parts by weight of AKD, and 85 parts by weight of water. After sizing, it is dried and calendered to obtain medical dialysis paper.

[0114] Test Example 1

[0115] The papers obtained in the above-mentioned Example 4, Example 5, Comparative Example 1, and Comparative Example 2 were subjected to performance tests, and the test results are shown in Table 1 below: Among them, the tensile strength was determined according to GB / T 12914, and the tests of the maximum equivalent pore size and air permeability were carried out with reference to the patent CN113136742B publicly disclosed by the applicant earlier.

[0116] Table 1 Test results of paper performance

[0117]

[0118] The embodiments of the present application are described above. Without conflict, the embodiments and the features in the embodiments in the present application can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Those of ordinary skill in the art, under the inspiration of the present application and without departing from the purpose of the present application and the scope protected by the claims, can also make many forms, all of which fall within the protection scope of the present application.

Claims

1. A method for fiber pretreatment for dialysis paper, characterized in that, By weight parts, the fibers for dialysis paper include: 20 - 30 parts of chemical fibers; 50 - 60 parts of softwood fibers; 80 - 90 parts of kapok fibers; Among them, the pretreatment method of the fibers for dialysis paper includes the steps: S1, After subjecting the softwood fibers to alkali treatment, place them in a microwave oven for microwave expansion treatment; S2, Mix the kapok fibers with the softwood fibers treated in step S1, then put them into an appropriate amount of non-polar solvent for soaking, and then fish them out and drain; S3, Mix the chemical fibers with the fibers treated in step S2, spray an appropriate amount of surface treatment agent solution, stir to make them evenly mixed, and then place them in an oven for drying to obtain the pretreated fibers for dialysis paper; The said step S1 includes: S11, Alkali treatment: Put the softwood fibers into a 3 - 5% alkali solution and soak them at room temperature for 10 - 20 h, then rinse them with water until neutral and dry for standby; S12, Microwave expansion: Mix the alkali-treated softwood fibers with ammonium carbamate powder, stir evenly, then place them in a microwave oven, and carry out microwave expansion treatment at a power of 300 - 600 W and 2000 - 3000 Hz for 60 - 100 s; S13, Water washing: Rinse the decomposition residues of ammonium carbamate in the softwood fibers with water 2 - 3 times, then fish them out and dry; The said step S2 includes: First, mix the kapok fibers with the softwood fibers treated in step S1, then put them into a non-polar solvent that is 3 - 5 times the total amount of kapok fibers and softwood fibers, soak them at room temperature for 1 - 2 h, then fish them out and drain; In the said step S3, the surface treatment agent solution includes surface treatment solution A and surface treatment solution B; The preparation process of the surface treatment solution A is as follows: First, prepare a dopamine hydrochloride solution with a concentration of 3 - 8 g / L, then add a certain amount of polyvinyl alcohol to the dopamine hydrochloride solution, and stir until it dissolves to obtain the surface treatment solution A; among them, the addition amount of the polyvinyl alcohol is 1.5 - 3 g / L; The preparation process of the surface treatment solution B is as follows: Put sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium fatty alcohol polyether sulfate, and silane coupling agent into water, stir evenly to obtain the surface treatment solution B; among them, the contents of sodium dodecylbenzenesulfonate, sodium hexametaphosphate, sodium fatty alcohol polyether sulfate, and silane coupling agent in the surface treatment solution B are 0.2 - 0.5 g / L, 0.5 - 1 g / L, 0.1 - 0.3 g / L, and 2 - 5 g / L respectively.

2. The fiber pretreatment method according to claim 1, wherein The fineness of the chemical fibers is 0.05 - 0.3 dtex, and the length is 3 - 5 mm. The chemical fibers are one or more of polyester fibers, polyamide fibers, and polylactic acid fibers.

3. The fiber pretreatment method according to claim 1, wherein The kapok fibers are natural kapok fibers.

4. The fiber pretreatment method according to claim 1, wherein In the said step S2, after soaking the kapok fibers and softwood fibers in the non-polar solvent and finishing, fish them out and drain until the content of the non-polar solvent in the kapok fibers and softwood fibers is between 50 - 80%.

5. The fiber pretreatment method according to claim 1, wherein, The spraying methods of the surface treatment solution A and the surface treatment solution B are: First, spray the surface treatment solution A on the surface of the mixed fibers. After stirring to make them evenly mixed, let it stand at room temperature for 1 to 3 hours. Then, spray the surface treatment agent solution B on the surface of the mixed fibers. After stirring to make them evenly mixed, place it in an oven and dry it at 100 to 120 °C to obtain the fibers for pretreated dialysis paper.

6. A dialysis paper, which is prepared from fibers treated by the fiber pretreatment method for dialysis paper according to any one of the above claims 1 to 5.

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