CN114351353A - Composite TiO2Preparation method of polypropylene non-woven fabric of @ PHMG antibacterial powder - Google Patents
Composite TiO2Preparation method of polypropylene non-woven fabric of @ PHMG antibacterial powder Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 109
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- 238000004519 manufacturing process Methods 0.000 claims description 4
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- KLZMUJRJFXYDCW-UHFFFAOYSA-N 2-[6-(diaminomethylideneamino)hexyl]guanidine;hydrochloride Chemical compound Cl.NC(N)=NCCCCCCN=C(N)N KLZMUJRJFXYDCW-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention provides a composite TiO2The preparation method of the @ PHMG antibacterial powder polypropylene non-woven fabric comprises the following steps: firstly, modifying nano-silica by adopting a silane coupling agent, and then reacting the modified nano-titania with polyhexamethylene guanidine hydrochloride under the condition of an alkaline catalyst to obtain TiO2@ PHMG antibacterial powder; then, the antibacterial powder and the melt-blown polypropylene are uniformly mixed according to a certain proportion, and the polypropylene non-woven fabric is prepared through melt-blown weaving treatment. Under the action of the silane coupling agent, the nano titanium dioxide and the polyhexamethylene guanidine hydrochloride are combined and added into the polypropylene matrix, so that the non-woven fabric is endowed with photocatalysis, self-cleaning and antibacterial propertiesCompared with the antibacterial non-woven fabric prepared in the prior art, the antibacterial non-woven fabric has the advantages of strong antibacterial property, long antibacterial aging, small using amount of an antibacterial agent and multiple functions, and the fibers in the prepared non-woven fabric are uniformly distributed, and the antibacterial powder in the fibers is not obviously aggregated.
Description
Technical Field
The invention relates to the technical field of preparation of antibacterial non-woven fabrics, in particular to composite TiO2A preparation method of a polypropylene non-woven fabric of @ PHMG antibacterial powder.
Background
Pathogenic bacteria and viruses are always a great factor threatening human health, and safe, nontoxic and strong antibacterial medical filter products become important barriers for people to resist germs in order to avoid infection. The polypropylene-based melt-blown non-woven fabric is a raw material of a commonly-used germ filtering product, and the compact and unordered fiber structure in the polypropylene-based melt-blown non-woven fabric can block outside germs. However, pure polypropylene fibers are not antimicrobial and bacteria adsorbed on the polypropylene fibers can still survive. In order to endow the polypropylene fiber with good antibacterial property, the inorganic antibacterial agent, the organic antibacterial agent or the composite antibacterial agent can be combined with the polypropylene by means of surface grafting, surface coating, melt blending and the like, or an antibacterial group is introduced to the polypropylene, so that the polypropylene shows the antibacterial property. However, the method inevitably has the defects of large using amount of the antibacterial agent, short antibacterial aging, high after-finishing cost, single function and the like, so that the development of the antibacterial polypropylene fiber with high safety and high efficiency is necessary.
In the study, nano titanium dioxide powder is used as an antibacterial agent and is loaded on a PP non-woven fabric antibacterial material to prepare the PP non-woven fabric antibacterial material with a photocatalytic antibacterial function. The nanometer titanium dioxide is easy to agglomerate due to the nanometer characteristics of small particle size, large specific surface area and high surface energy. In the technical scheme, the nanometer titanium dioxide is directly loaded on the PP non-woven fabric, and the nanometer titanium dioxide is likely to be unevenly distributed on the PP non-woven fabric and easily fall off, so that the antibacterial property of the finally prepared antibacterial material is influenced.
Chinese patent application No. 202010824640.X, published as 11/3/2020, entitled "a high-strength antibacterial non-woven fabric and preparation method thereof", is characterized in that polypropylene and ramie fibers are respectively modified by multi-stage chemical reactions, so that polypropylene has bactericidal property and ramie strength is improved; and finally, carrying out post-treatment on the modified polypropylene fiber by using the aloe extract-nano silver antibacterial liquid to prepare the non-woven fabric with high strength and high antibacterial property. However, the treatment process of the polypropylene fiber is complicated, and the subsequent introduction of the nano silver is high in cost, so that the polypropylene fiber is not suitable for mass production.
The Chinese patent application No. 201911373033.X, the publication date of which is 4.17.2020, discloses a preparation method of an anti-ultraviolet polypropylene non-woven fabric, which is provided by a patent named as 'a preparation method of an anti-ultraviolet polypropylene non-woven fabric'. In the application, coral reef powder particles are treated firstly, and then are fixed on the surface of polypropylene non-woven fabric in a chemical bonding mode; and finally, soaking the polypropylene non-woven fabric loaded with the coral reef powder particles in the nano titanium dioxide finishing liquid to prepare the polypropylene non-woven fabric with the ultraviolet resistance and the antibacterial action. However, in the above technical scheme, the nano titanium dioxide is deposited on the polypropylene non-woven fabric, and due to the weak binding force between the nano titanium dioxide and the polypropylene non-woven fabric, the nano titanium dioxide may fall off in the subsequent use process, which affects the antibacterial property of the polypropylene non-woven fabric.
In Chinese patent application No. 202110549936.X, the publication date is 20/8/2021, named as "a preparation method of a profiled porous hydrophilic antibacterial melt-blown non-woven fabric", polyhexamethylene guanidine hydrochloride and polypropylene wax grafted acrylic acid master batch are mixed according to a predetermined proportion to obtain hydrophilic antibacterial master batch; mixing the hydrophilic antibacterial master batch with melt-blown polypropylene, a pore-foaming agent, a nucleating agent and a dispersing agent in proportion to obtain a hydrophilic antibacterial master batch mixture; and finally, carrying out melt-blowing treatment on the hydrophilic antibacterial master batch mixture to obtain the special-shaped porous hydrophilic antibacterial melt-blown non-woven fabric. According to the technical scheme, the prepared non-woven fabric is excellent in antibacterial property, but is single in function, and the maximum utilization of resources cannot be realized.
In view of the above, there is a need for an improved composite TiO2A preparation method of a polypropylene non-woven fabric of @ PHMG antibacterial powder, which aims to solve the problems.
Disclosure of Invention
The invention aims to provide composite TiO2A preparation method of a polypropylene non-woven fabric of @ PHMG antibacterial powder.
In order to achieve the aim, the invention provides composite TiO2The preparation method of the @ PHMG antibacterial powder polypropylene non-woven fabric comprises the following steps:
s1, preparation of modified nano titanium dioxide: firstly, mixing a silane coupling agent with an acid catalyst and isopropanol to obtain a first mixed solution, adding nano titanium dioxide into the first mixed solution, fully reacting, filtering, and drying to obtain modified nano titanium dioxide;
s2, preparation of antibacterial powder: adding the modified nano titanium dioxide prepared in the step S1 into a mixed aqueous solution of polyhexamethylene guanidine hydrochloride and an alkaline catalyst to enable the modified nano titanium dioxide and the polyhexamethylene guanidine hydrochloride to fully react, and performing suction filtration and drying treatment to obtain TiO2@ PHMG antibacterial powder;
s3, preparation of the antibacterial polypropylene non-woven fabric: subjecting the TiO prepared in step S2 to2Mixing the antibacterial powder with melt-blown polypropylene, and melt-blowing to obtain composite TiO2The @ PHMG antibacterial powder polypropylene non-woven fabric.
Preferably, in step S3, the TiO is2The mixing mass ratio of the @ PHMG antibacterial powder to the melt-blown polypropylene is (2-5): 100.
preferably, in step S2, the mixing mass ratio of the modified nano titanium dioxide to the mixed aqueous solution is (5-8): (15-20).
Preferably, in step S1, the nano titanium dioxide is rutile type, and the particle size is 50-100 nm.
Preferably, in step S3, the melt-blown weaving process is performed using a melt-blowing machine; the melt-blowing machine comprises four heating sections, the temperature setting range is 180-240 ℃, the hot air temperature is 220-240 ℃, the hot air pressure is 0.2-0.4 Mpa, the frequency of a main screw motor is 10-12 Hz, the receiving distance is 20-25 cm, and the rotating speed of a receiving roller is 70-80 m/min.
Preferably, in step S1, the volume ratio of the silane coupling agent to the acidic catalyst to the isopropanol added is (10-20): (0.2-0.5): (80-90), and the reaction condition of the nano titanium dioxide and the first mixed solution is ultrasonic vibration for 10-12 hours.
Preferably, in the step S1, the adding amount of the nano titanium dioxide is 3-5 g/L.
Preferably, in step S1, the silane coupling agent is one of KBM-403 and KBM-503.
Preferably, in step S2, the mass fraction of the basic catalyst in the mixed aqueous solution is 0.2% to 0.5%.
Preferably, in step S2, the reaction of the modified nano titanium dioxide and polyhexamethylene guanidine hydrochloride is performed under stirring conditions; the stirring temperature under the stirring condition is 80-90 ℃, and the stirring time is 10-12 h.
The invention has the beneficial effects that:
1. the invention provides composite TiO2According to the preparation method of the @ PHMG antibacterial powder polypropylene non-woven fabric, the nano titanium dioxide is modified, and then the modified nano titanium dioxide is combined with the polyhexamethylene guanidine hydrochloride under the action of chemical bonding, so that the binding force between the antibacterial agent and the fiber is enhanced, and the antibacterial agent is prevented from falling off the fiber; the antibacterial property of the prepared polypropylene non-woven fabric can be effectively enhanced and the antibacterial aging can be prolonged through the synergistic interaction between the nano titanium dioxide and the polyhexamethylene guanidine hydrochloride; in addition, the method can be used for producing a composite materialThe introduction of the nano titanium dioxide endows the non-woven fabric with photocatalysis and self-cleaning functions, and enhances the application value of the non-woven fabric in the actual application scene.
2. The invention provides composite TiO2According to the preparation method of the @ PHMG antibacterial powder polypropylene non-woven fabric, when the polypropylene fiber is prepared, the antibacterial powder and the melt-blown polypropylene are mixed uniformly firstly, then melt-blown weaving treatment is carried out, so that the situation that the antibacterial powder in the finally prepared polypropylene non-woven fabric is not agglomerated is ensured, the distribution of the powder in the fiber is uniform, the antibacterial property of the nano titanium dioxide and the polyhexamethylene guanidine hydrochloride is fully utilized, and the using amount of the antibacterial agent is effectively reduced.
3. The invention provides composite TiO2The preparation method of the polypropylene non-woven fabric of the @ PHMG antibacterial powder can improve the modification efficiency by using the acid catalyst in the modification of the nano titanium dioxide; in TiO2The alkaline catalyst is added in the preparation process of the @ PHMG antibacterial powder, so that the combination of reactants is further improved, and the antibacterial powder with excellent performance is ensured to be prepared; the prepared non-woven fabric has the antibacterial rate of over 99 percent on escherichia coli and staphylococcus aureus in the antibacterial performance test of textiles, and still has the antibacterial rate of about 90 percent on the escherichia coli and staphylococcus aureus in the fifth antibacterial performance test.
Drawings
FIG. 1 shows a composite TiO obtained in example 1 of the present invention2SEM image of polypropylene nonwoven fabric of @ PHMG antibacterial powder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a composite TiO2The preparation method of the @ PHMG antibacterial powder polypropylene non-woven fabric comprises the following steps:
s1, preparation of modified nano titanium dioxide: firstly, mixing a silane coupling agent with an acid catalyst and isopropanol to obtain a first mixed solution, adding nano titanium dioxide into the first mixed solution, fully reacting, filtering, and drying to obtain modified nano titanium dioxide;
s2, preparation of antibacterial powder: adding the modified nano titanium dioxide prepared in the step S1 into a mixed aqueous solution of polyhexamethylene guanidine hydrochloride (PHMG) and an alkaline catalyst to enable the modified nano titanium dioxide and the polyhexamethylene guanidine hydrochloride to fully react, and performing suction filtration and drying treatment to obtain TiO2@ PHMG antibacterial powder;
s3, preparation of the antibacterial polypropylene non-woven fabric: subjecting the TiO prepared in step S22Mixing the antibacterial powder with melt-blown polypropylene, and melt-blowing to obtain composite TiO2The @ PHMG antibacterial powder polypropylene non-woven fabric.
In the step S1, the added nano titanium dioxide is dried for 10-12 hours at 80 ℃, the nano titanium dioxide is rutile type, the particle size is 50-100 nm, and the adding amount is 3-5 g/L; the volume ratio of the added silane coupling agent to the acidic catalyst to the isopropanol is (10-20): (0.2-0.5): (80-90); the silane coupling agent is one of KBM-403 and KBM-503; the reaction condition of the nano titanium dioxide and the first mixed solution is ultrasonic vibration for 10-12 hours.
In step S2, the mixing mass ratio of the added modified nano titanium dioxide to the mixed aqueous solution is (5-8): (15-20), wherein the mass fraction of the alkaline catalyst in the mixed aqueous solution is 0.2-0.5%; the reaction of the modified nano titanium dioxide and the polyhexamethylene guanidine hydrochloride is carried out under the stirring condition, the stirring temperature of the stirring condition is 80-90 ℃, and the stirring time is 10-12 hours.
Wherein, in step S3, TiO2The mixing mass ratio of the @ PHMG antibacterial powder to the melt-blown polypropylene is (2-5): 100 to optimize the antibacterial property of the finally obtained nonwoven fabric. When TiO is present2The adding proportion of the @ PHMG antibacterial powder to the polypropylene is less than 2: when the content of the antibacterial powder in the prepared polypropylene non-woven fabric is 100 hours, the antibacterial property of the non-woven fabric is insufficient; when TiO is present2The adding proportion of the @ PHMG antibacterial powder to the melt-blown polypropylene is higher than 5: when the time is 100 hours, the antibacterial powder and the melt-blown polypropylene are not easy to mix uniformly, meanwhile, a spinning nozzle of a melt-blown machine is easy to block in the process of preparing the polypropylene fiber, the continuity of the fiber preparation process is influenced, and the antibacterial property of the polypropylene non-woven fabric is influenced due to the phenomenon that the antibacterial powder is agglomerated in the finally prepared polypropylene non-woven fabric.
The melt-blowing machine used in the melt-blowing weaving treatment comprises four heating sections, the temperature setting range is 180-240 ℃, the hot air temperature is 220-240 ℃, the hot air pressure is 0.2-0.4 Mpa, the frequency of a main screw motor is 10-12 Hz, the receiving distance is 20-25 cm, and the rotating speed of a receiving roller is 70-80 m/min.
The following examples are given to composite TiO materials of the present invention2The following description is provided for the preparation of polypropylene nonwoven fabric of @ PHMG antibacterial powder:
example 1
S1, drying the nano titanium dioxide at 80 ℃ for 12 hours for later use; mixing a silane coupling agent of KBM-403, an acidic catalyst and isopropanol according to a ratio of 10: 0.2: 90 to obtain a first mixed solution, adding the pretreated nano titanium dioxide into the first mixed solution in a ratio of 5g/L, performing ultrasonic vibration for 12 hours, performing suction filtration and drying to obtain the modified nano titanium dioxide.
S2, uniformly mixing the modified nano titanium dioxide prepared in the step S1, polyhexamethylene guanidine hydrochloride (PHMG) and a mixed aqueous solution of an alkaline catalyst in a mass ratio of 8:17, stirring for 12 hours at 80 ℃, and performing suction filtration and drying treatment to obtain TiO2@ PHMG antibacterial powder.
S3, mixing TiO prepared in step S2 with required quality2Mixing the antibacterial powder with melt-blown polypropylene uniformly, wherein the mass of the melt-blown polypropylene is TiO22.5% of the antibacterial powder of @ PHMG; then, the mixture is melt-blown and woven, the melt-blown machine comprises four heating sections, the specific temperature of the heating sections is set to be 180 ℃, 200 ℃, 220 ℃ and 240 ℃, the hot air pressure is 0.21Mpa, the frequency of a main screw motor is 10Hz, the receiving distance is 24cm, the rotating speed of a receiving roller is 80m/min, and the composite TiO is prepared2The @ PHMG antibacterial powder polypropylene non-woven fabric. Referring to FIG. 1, the composite TiO prepared in example 12The fibers in the polypropylene non-woven fabric of the @ PHMG antibacterial powder are distributed in three dimensions and are uniformly distributed, and TiO in the fibers2The @ PHMG antibacterial powder has no obvious aggregation.
In the embodiment 1 of the invention, under the action of a silane coupling agent, nano titanium dioxide and polyhexamethylene guanidine hydrochloride (PHMG) are combined to prepare TiO2@ PHMG antibacterial powder, the reaction formula is as follows:
examples 2 to 3
Examples 2 to 3 differ from example 1 only in that: TiO in preparation of polypropylene fiber2The adding mass ratio of the @ PHMG antibacterial powder to the melt-blown polypropylene is different, other steps are basically the same as those in the embodiment 1, and are not repeated herein, and the antibacterial rate, the contact angle and the tensile strength of the obtained polypropylene non-woven fabric under different adding proportions are shown in Table 1:
TABLE 1 addition ratios of examples 2 to 3 and antimicrobial ratios, contact angles and tensile strengths of nonwoven fabrics produced under the conditions
As can be seen from the experimental results in Table 1, whenAdded TiO2When the ratio of the @ PHMG antibacterial powder to the melt-blown polypropylene is 2.5:100, the antibacterial property of the non-woven fabric is strongest, and the tensile strength of the fiber is maximum; the antibacterial powder is uniformly distributed in the non-woven fabric under the condition of the proportion, and agglomeration is not easy to occur, so that the non-woven fabric is ensured to have high antibacterial property, and the tensile strength of the fiber is not influenced by the addition of the antibacterial powder. In addition, repeated antibacterial tests are carried out on the non-woven fabric in the example 1 in the experiment, and the experiment result shows that the antibacterial rate of the non-woven fabric on escherichia coli and staphylococcus aureus is still about 90% in the fifth antibacterial test.
Comparative example 1
The difference between the comparative example 1 and the example 1 is that the nano titanium dioxide is not modified in step S1, and the antibacterial test is performed after the illumination, the other steps are substantially the same as those in the example 1, and are not repeated here, and the antibacterial ratio and the tensile strength of the obtained polypropylene nonwoven fabric are shown in table 2:
TABLE 2 antibacterial ratio, contact angle and tensile strength of the polypropylene nonwoven fabrics of comparative example 1 and example 1
| Item | Antibacterial ratio (%) | Contact angle (°) | Tensile Strength (MPa) |
| Example 1 | 99 | 52 | 1.5 |
| Comparative example 1 | 78 | 54 | 1.5 |
As can be seen from the data in table 2, after the nano titanium dioxide is modified, the antibacterial rate of the prepared polypropylene non-woven fabric is greatly improved, mainly because the modified nano titanium dioxide and the PHMG are combined together in a chemical bonding manner, the combination of the modified nano titanium dioxide and the PHMG is firmer, the antibacterial powder is not easy to fall off from the non-woven fabric, and the antibacterial property of the antibacterial powder is fully utilized; on the other hand, the epoxy group introduced during modification treatment is a hydrophilic group, so that the contact angle between the polypropylene non-woven fabric and water can be further reduced, liquid drops with pathogenic bacteria can be more fully contacted with the polypropylene non-woven fabric, and the killing of the pathogenic bacteria is efficiently realized.
Lower face to composite TiO2The mechanism of formation of the polypropylene nonwoven fabric of @ PHMG antibacterial powder is explained:
adding nano titanium dioxide into a mixed solution of a silane coupling agent, an acid catalyst and isopropanol, wherein under the environment of ultrasonic vibration, due to the fact that the silane coupling agent contains hydrolyzable groups, the nano titanium dioxide contains hydroxyl groups, and the hydroxyl groups and the hydrolyzable groups are interacted in the environment of the isopropanol; meanwhile, the acid catalyst can promote the reaction to occur, so that the nano titanium dioxide is coupled with the silane coupling agent to introduce an epoxy group onto the nano titanium dioxide, and other substances are conveniently loaded onto the nano titanium dioxide subsequently; then, in the environment of an alkaline catalyst, the epoxy group on the modified nano titanium dioxide and polyhexamethylene guanidine hydrochloride are subjected to ring-opening reaction to prepare the composite TiO2@ PHMG powder, due to TiO2TiO in @ PHMG composite material2The PHMG and the PHMG are combined together in a chemical bonding mode, and the combination of the PHMG and the PHMG is firmer and is not easy to fall off from the fiber.
Then, the compound TiO is added2Mixing the antibacterial powder with melt-blown polypropylene at a ratio of 2.5%, and weaving by melt-blowingThe polypropylene non-woven fabric with photocatalysis, self-cleaning and antibacterial properties is prepared after the manufacturing treatment. In TiO2Under the condition that the adding proportion of the @ PHMG antibacterial powder and the melt-blown polypropylene is 2.5 percent, the finally prepared polypropylene non-woven fabric has the optimal antibacterial property, and because under the condition of the proportion, TiO is added2The @ PHMG antibacterial powder and the melt-blown polypropylene are easy to be uniformly mixed and can be uniformly dispersed in the finally prepared polypropylene non-woven fabric, thereby fully exerting TiO2And antibacterial property of PHMG, and TiO2The synergistic interaction with the PHMG obviously improves the antibacterial property of the polypropylene and reduces the dosage of the antibacterial agent; in addition, TiO in the polypropylene nonwoven fabric2The introduction of the titanium dioxide not only endows the polypropylene non-woven fabric with antibacterial property, but also catalyzes the degradation of organic pollutants on the surface of the fiber while the titanium dioxide on the fiber plays an antibacterial role under the illumination condition, so that the fiber is endowed with self-cleaning property; adding TiO into the mixture2Mixing the antibacterial powder with melt-blown polypropylene, melt-blown weaving, and modifying TiO2The addition of the compound can effectively avoid the dissolution of polyhexamethylene guanidine hydrochloride in the polypropylene non-woven fabric, is beneficial to prolonging the antibacterial aging of the polypropylene non-woven fabric, mainly because of the modified TiO in the polypropylene fiber2The introduction of the poly (hexamethylene guanidine hydrochloride) reduces the contact angle between the polypropylene non-woven fabric and water, so that the polypropylene non-woven fabric can be fully contacted with liquid drops with pathogenic bacteria, and the killing of the poly (hexamethylene guanidine hydrochloride) on the pathogenic bacteria is efficiently realized; on the other hand, the combination of the polyhexamethylene guanidine hydrochloride and the nano titanium dioxide can avoid the agglomeration phenomenon of the nano titanium dioxide, and the reduction of the antibacterial property of the finally prepared antibacterial non-woven fabric caused by the aggregation of the powder is avoided.
It will be understood by those skilled in the art that the volume ratio of the silane coupling agent to the acidic catalyst and the isopropanol in step S1 may also be 10: 0.5: 80 or 20: 0.5: 80 or 15: 0.25: 85, the silane coupling agent can also be KBM-503, which is not limited herein, and only needs to be added according to actual needs.
In conclusion, the invention combines the nano titanium dioxide and the polyhexamethylene guanidine hydrochloride into the polypropylene substrate through the effect of the silane coupling agent, and the polypropylene non-woven fabric with high antibacterial property is obtained through melt-blown weaving treatment. By utilizing the synergistic interaction between the nano titanium dioxide and the polyhexamethylene guanidine hydrochloride, the antibacterial property of the prepared antibacterial non-woven fabric is obviously improved, the addition amount of the antibacterial agent is reduced, and the defects that the polyhexamethylene guanidine hydrochloride is easily dissolved out from the fiber when the polyhexamethylene guanidine hydrochloride is directly used on the polypropylene fiber in the prior art and the nano titanium dioxide is directly loaded on the polypropylene fiber and is easily agglomerated are effectively overcome; meanwhile, the addition of the nano titanium dioxide endows the non-woven fabric with photocatalysis and self-cleaning performances.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. Composite TiO2The preparation method of the @ PHMG antibacterial powder polypropylene non-woven fabric is characterized by comprising the following steps:
s1, preparation of modified nano titanium dioxide: firstly, mixing a silane coupling agent with an acid catalyst and isopropanol to obtain a first mixed solution, adding nano titanium dioxide into the first mixed solution, fully reacting, filtering, and drying to obtain modified nano titanium dioxide;
s2, preparation of antibacterial powder: adding the modified nano titanium dioxide prepared in the step S1 into a mixed aqueous solution of polyhexamethylene guanidine hydrochloride and an alkaline catalyst to enable the modified nano titanium dioxide and the polyhexamethylene guanidine hydrochloride to fully react, and performing suction filtration and drying treatment to obtain TiO2@ PHMG antibacterial powder;
s3, preparation of the antibacterial polypropylene non-woven fabric: subjecting the TiO prepared in step S2 to2Antibacterial @ PHMG powderAfter being fully and uniformly mixed with melt-blown polypropylene, the mixture is subjected to melt-blown weaving treatment to prepare the composite TiO2The @ PHMG antibacterial powder polypropylene non-woven fabric.
2. The composite TiO of claim 12A method for producing a polypropylene nonwoven fabric of @ PHMG antibacterial powder, characterized in that, in step S3, the TiO is2The mixing mass ratio of the @ PHMG antibacterial powder to the melt-blown polypropylene is (2-5): 100.
3. the composite TiO of claim 12The preparation method of the @ PHMG antibacterial powder polypropylene non-woven fabric is characterized in that in step S2, the mixing mass ratio of the modified nano titanium dioxide to the mixed aqueous solution is (5-8): (15-20).
4. The composite TiO of claim 12A preparation method of a @ PHMG antibacterial powder polypropylene non-woven fabric is characterized in that in step S1, the nano titanium dioxide is rutile type, and the particle size is 50-100 nm.
5. The composite TiO of claim 12A process for producing a polypropylene nonwoven fabric of @ PHMG antibacterial powder, characterized in that in step S3, the melt-blown weaving treatment is carried out by a melt-blowing machine; the melt-blowing machine comprises four heating sections, the temperature setting range is 180-240 ℃, the hot air temperature is 220-240 ℃, the hot air pressure is 0.2-0.4 Mpa, the frequency of a main screw motor is 10-12 Hz, the receiving distance is 20-25 cm, and the rotating speed of a receiving roller is 70-80 m/min.
6. The composite TiO of claim 12The preparation method of the @ PHMG antibacterial powder polypropylene non-woven fabric is characterized in that in step S1, the volume ratio of the silane coupling agent to the acidic catalyst to the isopropanol is (10-20): (0.2-0.5): (80-90), and the reaction condition of the nano titanium dioxide and the first mixed solution is ultrasonic vibration for 10-12 hours.
7. The composite TiO of claim 12The preparation method of the @ PHMG antibacterial powder polypropylene non-woven fabric is characterized in that in the step S1, the addition amount of the nano titanium dioxide is 3-5 g/L.
8. The composite TiO of claim 12The preparation method of the polypropylene non-woven fabric of the @ PHMG antibacterial powder is characterized in that in step S1, the silane coupling agent is one of KBM-403 and KBM-503.
9. The composite TiO of claim 12A method for producing a polypropylene nonwoven fabric of @ PHMG antibacterial powder, characterized in that, in step S2, the mass fraction of the alkaline catalyst in the mixed aqueous solution is 0.2% to 0.5%.
10. The composite TiO of claim 12A preparation method of a polypropylene non-woven fabric of @ PHMG antibacterial powder, which is characterized in that in step S2, the reaction of the modified nano titanium dioxide and polyhexamethylene guanidine hydrochloride is carried out under the stirring condition; the stirring temperature under the stirring condition is 80-90 ℃, and the stirring time is 10-12 h.
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