PVA (Polyvinyl Alcohol) water-soluble film with color fixing function as well as preparation method and application of PVA water-soluble film

Abstract

The invention discloses a PVA water-soluble film with a color fixing function and a preparation method and application thereof.Firstly, a green color fixing agent P (DMDAAC-AGE) which is high in performance and wide in applicability is prepared, the problem that a traditional color fixing agent is poor in color fastness is solved, water-soluble PVA serves as a carrier, hydroxyl in a PVA molecular chain can react with the color fixing agent, and the color fastness of the color fixing agent is improved; the water-soluble film can be further combined with dye molecules, the binding strength between the dye molecules and the color fixing agent is improved under multiple reactions, meanwhile, after the water-soluble film is dissolved, the film is immediately formed on the surface of the fabric, the defect that the coating performance of the allyl quaternary ammonium salt derivative polymer color fixing agent on the dye is insufficient is overcome, colored fine fibers are inhibited from being rubbed down, and the color fixing effect is improved. And a new idea is provided for manufacturing the high-efficiency color-fixed Miao embroidery lining cloth, and the method has important theoretical significance and practical application value.

Description

Technical Field

[0001] The invention belongs to the technical field of PVA water-soluble films for textiles, and in particular relates to a PVA water-soluble film with a color fixing function and a preparation method and application thereof. Background Art

[0002] As an important part of Chinese traditional culture, Miao embroidery has been vigorously developed and promoted in Guizhou and other places in recent years. In the production process of traditional Miao embroidery, kraft paper or non-woven fabric is needed as the substrate, which is difficult to remove and affects the quality of the finished product. Therefore, biodegradable substrate materials specifically for Miao embroidery are actively developed and promoted.

[0003] Polyvinyl alcohol (PVA) is a colorless, non-toxic, non-corrosive water-soluble organic polymer material with a regular linear molecular chain structure containing a large number of hydroxyl groups. It is easy to form a large number of hydrogen bonds within and between molecules and has good film-forming properties and biological stability. PVA water-soluble film can be used as the base material for Miao embroidery to meet the needlework requirements of Miao embroidery, machine embroidery and hand embroidery. The film itself dissolves quickly when the embroidery is washed with water at the end of the embroidery, making the base material removal process more efficient and quick without affecting the quality of the embroidery.

[0004] Most dyes used for embroidery fabrics and embroidery threads on the market, such as direct dyes, acid dyes, reactive dyes, etc., usually contain some soluble groups, which can easily cause problems such as poor color fastness to wet friction of dyed textiles. During the later processing and use, the dyes on the fabric will dissociate from the fibers and dissolve in water, causing the color of the fabric to change.

[0005] Most traditional color fixers have been banned due to the presence of free formaldehyde. In order to solve the problems of yellowing and reduced color fastness to sunlight of polyamine polymer color fixers, researchers have developed polycationic color fixers. Polycationic color fixers usually have a linear structure, among which quaternary ammonium salts have the strongest polycationicity and the best color fixation performance. Polydimethyldiallyl ammonium chloride (PDMDAAC) color fixer is a type of allyl quaternary ammonium salt and its derivative polymers. It has the characteristics of being non-toxic, easy to synthesize, economical and stable. The fiber structure of this color fixer is similar to that of cotton fiber, and the positive charge density on the macromolecular chain is high. It shows high performance in color fixation of cotton fabrics. Some allyl quaternary ammonium salt-derived polymer color fixers can connect linear structures into a network structure by micro-crosslinking, thereby improving the interaction between fibers and dyes, thereby improving the color fastness of dyed fabrics. However, this type of color fixer has insufficient coating of dyes, and its color fastness to wet friction is relatively poor. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0008] Therefore, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a PVA water-soluble film with a color fixing function.

[0009] In order to solve the above technical problems, the present invention provides the following technical solution: based on the mass fraction of the PVA water-soluble film raw material, it includes:

[0010] 2 to 15 parts of polyvinyl alcohol (PVA), 50 to 90 parts of deionized water, 1 to 10 parts of plasticizer, 3 to 12 parts of color fixing agent, and 2 to 4 times the amount of strong base compared to the color fixing agent;

[0011] The color fixing agent is a polymer of dimethyldiallyl ammonium chloride (DMDAAC) and allyl glycidyl ether (AGE), and the ratio of the amount of the strong base to the color fixing agent is 1 to 4:1.

[0012] As a preferred embodiment of the PVA water-soluble film with color fixing function described in the present invention, the plasticizer includes one of glycerol, 1,4-butanediol and propylene glycol.

[0013] As a preferred embodiment of the PVA water-soluble film with color fixing function described in the present invention, the strong base includes one of sodium hydroxide and potassium hydroxide.

[0014] Another object of the present invention is to provide a method for preparing a PVA water-soluble film with a color fixing function.

[0015] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0016] Add polyvinyl alcohol to deionized water and heat and stir under constant temperature water bath until the polyvinyl alcohol is completely dissolved;

[0017] Add a color fixing agent and a strong base, and perform ultrasonic oscillation treatment under heating conditions to obtain a mixed solution;

[0018] Add a plasticizer to the mixed solution and stir, then add a defoamer and continue stirring to obtain a casting solution;

[0019] The casting liquid is scraped by a film scraper and then dried by electric heating and air blast to obtain a PVA water-soluble film with a color fixing function.

[0020] As a preferred embodiment of the method for preparing the PVA water-soluble film with color fixing function described in the present invention, the method for preparing the color fixing agent comprises:

[0021] The DMDAAC and AGE are in a substance amount ratio of 1:1 to 4:1, and the ethylene-AGE ethanol solution is continuously added dropwise to a four-necked flask containing a DMDAAC aqueous solution, and the temperature is raised to 75 to 80° C. under stirring, and then an initiator aqueous solution is continuously added dropwise, wherein the mass of the initiator in the initiator aqueous solution is 0.5% to 1.5% of the total mass of DMDAAC and AGE;

[0022] After the addition is completed, the reaction is kept at 60-90°C for 4-7 hours, and the obtained mixture is transferred to a small beaker and cooled to room temperature to obtain a colorless and transparent polymer, which is a polymer of dimethyldiallylammonium chloride and allyl glycidyl ether P (DMDAAC-AGE), which is a color fixing agent.

[0023] As a preferred embodiment of the method for preparing the PVA water-soluble film with color fixing function described in the present invention, the heating and stirring are carried out under constant temperature water bath conditions, wherein the heating and stirring temperature is 80-90°C, the stirring speed is 200-300r / min, and the stirring time is 1-2h.

[0024] As a preferred embodiment of the method for preparing the PVA water-soluble film with color fixing function described in the present invention, the ultrasonic temperature of the ultrasonic oscillation treatment is 50-70° C., and the ultrasonic time is 0.5-2 h.

[0025] As a preferred embodiment of the method for preparing the PVA water-soluble film with color fixing function described in the present invention, the stirring time of adding the plasticizer is 0.5 to 1 hour, the stirring speed is 200 to 300 r / min, the stirring time of adding the defoaming agent and continuing to stir is 10 to 15 minutes, and the stirring speed is 200 to 300 r / min.

[0026] As a preferred embodiment of the method for preparing the PVA water-soluble film with color fixing function described in the present invention, the drying time of the electric heating blast drying is 15 to 25 minutes, and the drying temperature is 110 to 130°C.

[0027] Another object of the present invention is to provide a PVA water-soluble film with a color fixing function to improve the color fixing performance of fabrics.

[0028] Beneficial effects of the present invention:

[0029] This experiment developed a high-performance, widely applicable green color fixing agent, which improved the problem of poor color fastness of traditional color fixing agents. In addition, water-soluble PVA was used as a carrier. The hydroxyl groups in the PVA molecular chain could not only react with the color fixing agent, but also further combine with the dye molecules. The multiple reactions improved the binding fastness between the dye molecules and the color fixing agent. At the same time, after the water-soluble film itself was dissolved, it immediately formed a film on the fabric surface, making up for the insufficient coating of the allyl quaternary ammonium salt-derived polymer color fixing agent on the dye, and inhibiting the colored fine fibers from being rubbed off, achieving the dual effects of improving the feel and aesthetics of the fabric, providing a new idea for the manufacture of efficient color-fixing Miao embroidery lining cloth, which has important theoretical significance and practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0031] Figure 1 It is a schematic diagram of the synthesis process of the PVA water-soluble film with color fixing function of the present invention. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] Unless otherwise specified, the raw materials used in the present invention are all commercially available in the art, including:

[0036] PVA (analytical grade, average degree of polymerization 1750±50) was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0037] Dimethyldiallylammonium chloride (DMDAAC) (60 wt %, industrial grade) and allyl glycidyl ether (AGE) (industrial grade) were purchased from Shanghai MacLean Reagent Company.

[0038] In the specific embodiment of the present invention:

[0039] Staining method reference:

[0040] The dye used was Reactive Red R-3G, 3% (owf), sodium sulfate Na2SO4 (20 g / L), Na2CO3 (10 g / L);

[0041] The bath ratio is 1:30, and the original fabric is dyed at 40°C. After 10 minutes, 1 / 3 of Na2SO4 is added, and dyeing is continued for 10 minutes. The remaining Na2SO4 is added, and after 10 minutes, the temperature is raised to 65°C at 1°C / min, and 1 / 2 of Na2CO3 is added. After 10 minutes, the remaining Na2CO3 is added, and after 20 minutes, the temperature is lowered, washed with water, and dried to obtain the dyed fabric;

[0042] Fixing method reference:

[0043] The water-soluble film samples prepared in each embodiment or comparative example were used for cloth dyeing and finishing, with a bath ratio of 1:30. The water-soluble film and the dyed cloth were cut into samples of 10 cm × 10 cm in size, and the four corners were fixed in water with a mass fraction of 2% (owf), and the solution pH was 5-6. The water-soluble film was repeatedly rinsed in one direction at 60°C for 0.5h to dissolve the water-soluble film, fix the color, and then dried at 80°C after being taken out.

[0044] Color fastness to rubbing test:

[0045] Refer to the method in GB / T3920-2008 "Textiles - Tests for Colour Fastness - Colour Fastness to Rubbing" to test the colour fastness to rubbing before and after fixing.

[0046] Color fastness to soap washing:

[0047] Cut the standard white cotton cloth and the color-fixing treated cloth into a size of 10cm×5cm, overlap the two pieces of cloth and sew them all around, wash for 30 minutes under the conditions of bath ratio 1:20, soap flakes 5g / L, Na2CO3 (2g / L), 95℃, and 10 steel balls, rinse with clean water, dry, and grade.

[0048] Rating:

[0049] Use GB / T250-2008 Grey Scale for Assessing Color Change and GB / T251-2008 Grey Scale for Assessing Staining for rating.

[0050] Example 1

[0051] Reference Figure 1 This embodiment provides a method for preparing a PVA water-soluble film with a color fixing function, specifically:

[0052] 1) Preparation of fixing agent:

[0053] According to the ratio of n(DMDAAC):n(AGE) being 2:1, the AGE ethanol solution was continuously added dropwise to the four-necked flask containing the DMDAAC aqueous solution, the temperature was raised to 80°C with stirring, and the initiator (KPS) aqueous solution was continuously added dropwise, wherein the amount of the initiator was 0.75% of the total amount of DMDAAC and AGE;

[0054] After the addition was completed, the mixture was kept at 80°C for 6 hours, and the mixture was transferred to a small beaker and cooled to room temperature to obtain a colorless and transparent polymer P (DMDAAC-AGE), which was the color fixing agent.

[0055] 2) Preparation of PVA water-soluble film:

[0056] Weigh the raw materials: 7 parts of PVA, 80 parts of deionized water, 3 parts of glycerin (plasticizer), 7 parts of polymer P (color fixing agent) obtained in step 1), and sodium hydroxide (strong base) twice the amount of the color fixing agent;

[0057] Pour PVA into a 500ml three-necked flask, add deionized water, place the flask in a constant temperature water bath, heat and stir at 90°C for 1.5h at a speed of 300r / min until the PVA is completely dissolved;

[0058] Add polymer P and sodium hydroxide, shake and stir for 1.5 h under ultrasonic temperature of 60°C to obtain a mixed solution;

[0059] Add glycerol to the mixture and stir for 0.5h, add a few drops of defoamer, reduce the speed to 200r / min, stir for 10min, stop, and pour out the casting solution;

[0060] The film was scraped with a film scraper, dried in an electric heated blast drying oven at 120° C. for 20 min, and cooled to room temperature to obtain the PVA water-soluble film with color fixing function of this embodiment.

[0061] Example 2

[0062] The difference between this embodiment and embodiment 1 is that the amount of polymer P in step 2) the preparation of the PVA water-soluble film is adjusted to 5 parts, and the remaining steps and processes are all referred to embodiment 1 to obtain the PVA water-soluble film of this embodiment.

[0063] Example 3

[0064] The difference between this embodiment and embodiment 1 is that the amount of polymer P in step 2) the preparation of the PVA water-soluble film is adjusted to 9 parts, and the remaining steps and processes are all referred to embodiment 1 to obtain the PVA water-soluble film of this embodiment.

[0065] Comparative Example 1

[0066] The difference between this comparative example and Example 1 is that the fixing agent and the strong base are omitted, and the remaining steps are referred to Example 1 to obtain the PVA water-soluble film of this comparative example.

[0067] Comparative Example 2

[0068] The difference between this comparative example and Example 1 is that the curing agent is replaced by commercially available polydimethyldiallylammonium chloride (PDMDAAC), specifically:

[0069] Pour 7 parts of PVA into a 500ml three-necked flask, add 85 parts of deionized water, place the flask in a constant temperature water bath, heat and stir at 90°C for 1.5h at a speed of 300r / min until the PVA is completely dissolved;

[0070] Add 7 parts of PDMDAAC, weigh 1 part of 1,4-butanediol, add it to the mixture and stir for 0.5h, add a few drops of defoamer, reduce the speed to 200r / min, stir for 10min, stop, and pour out the casting solution;

[0071] The film was scraped with a film scraper, dried in an electric heated blast drying oven at 120° C. for 20 min, and cooled to room temperature to obtain the PVA water-soluble film of this comparative example.

[0072] Comparative Example 3

[0073] The difference between this comparative example and Example 1 is that the curing agent is replaced with commercially available AGE, specifically:

[0074] Pour 7 parts of PVA into a 500ml three-necked flask, add 80 parts of deionized water, place the flask in a constant temperature water bath, heat and stir at 90°C for 1.5h at a speed of 300r / min until the PVA is completely dissolved;

[0075] Add 7 parts of commercially available AGE color fixative, weigh 3 parts of glycerol (plasticizer), add to the mixture and stir for 0.5h, add a few drops of defoamer, reduce the speed to 200r / min, stir for 10min, stop, and pour out the casting solution;

[0076] The film was scraped with a film scraper, dried in an electric heating blast drying oven at 120°C for 20 minutes, and cooled to room temperature to obtain the PVA water-soluble film of this comparative example.

[0077] The PVA water-soluble films prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were subjected to relevant performance tests, and the results are shown in Table 1.

[0078] Table 1

[0079]

[0080]

[0081] As can be seen from Table 1, compared with the solutions of Comparative Examples 1 to 3, after the color fixing treatment of the solution of the embodiment of the present invention, the color fastness to friction and the color fastness to soaping of the fabric are improved to varying degrees. This is mainly because the color fixing PVA water-soluble film can be combined with the quaternary ammonium salt group and the dye anion to form a lake and deposited on the fiber, and the unreacted hydroxyl groups on the PVA molecular chain can be further combined with the dye through Coulomb attraction, hydrogen bonds, covalent bonds, etc., to improve the binding fastness between the color fixing agent and the dye, and even form cross-linking, inhibit fiber swelling, and prevent the dye molecules from being desorbed from the fiber. In addition, polyvinyl alcohol itself is a film-forming substance. After forming a film on the surface of the fabric, it can increase the smoothness of the fabric, reduce the friction coefficient, and thus inhibit the colored fine fibers from being rubbed off.

[0082] At the same time, when the amount of fixing agent increases, the probability of hydroxyl reaction in PVA increases, and the mechanical properties of the obtained fixed PVA water-soluble film are improved, which can meet the mechanical property requirements of Miao embroidery lining cloth. However, excessive dosage will cause cross-linking between epoxy groups, making the fixing agent inactive and affecting the fixing effect.

[0083] Example 4

[0084] This example is used to explore the influence of different ultrasonic times on the relevant properties of the prepared PVA film. The difference from Example 1 is that the ultrasonic time after adding polymer P and sodium hydroxide in step 2) is adjusted to 0.5, 1.0, 1.5, and 2 h, respectively. The remaining steps and processes are all referred to Example 1. The relevant properties of the prepared PVA film are measured, and the results are shown in Table 2.

[0085] Table 2

[0086]

[0087]

[0088] Example 5

[0089] This example is used to explore the influence of different ultrasonic temperatures on the relevant properties of the prepared PVA film. The difference from Example 1 is that the ultrasonic temperatures after adding polymer P and sodium hydroxide in step 2) are adjusted to 50, 60, 70, and 80°C, respectively. The remaining steps and processes are all referred to Example 1. The relevant properties of the prepared PVA film are measured, and the results are shown in Table 3.

[0090] Table 3

[0091]

[0092] It can be seen from Tables 2 and 3 that the preparation process of the fixed color PVA water-soluble film is an exothermic process. If the ultrasonic reaction temperature is too high or the reaction time is too long, it is not conducive to the reaction. If the temperature is too low or the reaction time is too short, the molecular activation energy is low and the reaction is difficult to proceed, which leads to differences in the performance of the prepared PVA film.

[0093] Example 6

[0094] This example is used to explore the influence of different molar ratios of alkali and PVA on the relevant properties of the prepared PVA film. The difference from Example 1 is that the multiples of the amount of the strong base compared to the color fixing agent in step 2) are adjusted to 1, 2, 3, and 4 times, that is, n (strong base): n (color fixing agent) are 1:1, 2:1, 3:1, and 4:1, respectively. The remaining steps and processes are all referred to Example 1. The relevant properties of the prepared PVA film are measured, and the results are shown in Table 4.

[0095] Table 4

[0096]

[0097]

[0098] It can be seen from Table 4 that although the increase in the amount of alkali can promote the reaction to a certain extent, it will also cause cross-linking between PVA molecules and limit the activity of PVA molecular chains. Only under the appropriate ratio, the mutual restriction of the two factors makes the color-fixing effect of the fixed PVA water-soluble film tend to be stable.

[0099] Comparative Example 4

[0100] The difference between this comparative example and Example 1 is that the addition method of AGE in the preparation process of the fixing agent is adjusted to direct mixing, specifically:

[0101] Mix DMDAAC aqueous solution and AGE ethanol solution in a four-necked flask at a ratio of n(DMDAAC):n(AGE) of 2:1;

[0102] The remaining steps and processes are all referred to Example 1 to obtain the curing agent and PVA water-soluble film of this comparative example. The relevant properties of the obtained PVA film are measured and compared with those of Example 1. The results are shown in Table 5.

[0103] Table 5

[0104]

[0105] It can be seen from Table 5 that the addition method of AGE in the preparation process of the curing agent will also have a significant impact on the performance of the water-soluble film. This is because DMDAAC itself has low activity. If AGE is added at one time, the resulting fixing agent is mainly a homopolymer of AGE, and the degree of copolymerization with the DMADAAC monomer is not high, resulting in uneven composition of the fixing agent, which in turn affects the color fastness index.

[0106] Comparative Example 5

[0107] The difference between this comparative example and Example 1 is that PVA is replaced by polylactic acid (PLA) with free hydroxyl groups in the same molecular chain, and the rest of the preparation process is referred to Example 1 to obtain the PLA water-soluble film of this comparative example, and the performance of the water-soluble film is measured.

[0108] The results showed that the functional groups in the PLA molecule gave it a certain solubility in water, but it was greatly affected by the molecular weight and crystallinity. After the addition of the fixing agent, PLA had poor water solubility and was difficult to replace the water-soluble film in the present invention for fixing the Miao embroidery fabric.

[0109] In summary, a high-performance, widely applicable green color fixing agent is prepared by the method of the present invention, which improves the problem of poor color fastness of traditional color fixing agents. Moreover, with water-soluble PVA as a carrier, the hydroxyl groups in the PVA molecular chain can not only react with the color fixing agent, but also further combine with the dye molecules, thereby improving the binding fastness between the dye molecules and the color fixing agent under multiple reactions. At the same time, after the water-soluble film itself dissolves, it immediately forms a film on the surface of the fabric, thereby making up for the disadvantage of insufficient coating of the allyl quaternary ammonium salt-derived polymer color fixing agent on the dye, inhibiting the colored fine fibers from being rubbed off, and achieving the dual effects of improving the feel and aesthetics of the fabric, thereby providing a new idea for manufacturing Miao embroidery lining cloth with high-efficiency color fixing, and having important theoretical significance and practical application value.

[0110] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A PVA water-soluble film with color fixing function, characterized in that: Calculated by weight of the PVA water-soluble film raw material, including: 2 to 15 parts of polyvinyl alcohol, 50 to 90 parts of deionized water, 1 to 10 parts of plasticizer, 3 to 12 parts of color fixing agent, and 2 to 4 times the amount of strong base compared to the color fixing agent; Wherein, the color fixing agent is a polymer of dimethyldiallylammonium chloride and allyl glycidyl ether.

2. The PVA water-soluble film with color fixing function as claimed in claim 1, characterized in that: The plasticizer includes one of glycerol, 1,4-butanediol and propylene glycol.

3. The PVA water-soluble film with color fixing function as claimed in claim 1, characterized in that: The strong base includes one of sodium hydroxide or potassium hydroxide.

4. The method for preparing a PVA water-soluble film with a color fixing function according to any one of claims 1 to 3, characterized in that: include, Add polyvinyl alcohol to deionized water and heat and stir under constant temperature water bath until the polyvinyl alcohol is completely dissolved; Add a color fixing agent and a strong base, and perform ultrasonic oscillation treatment under heating conditions to obtain a mixed solution; Add a plasticizer to the mixed solution and stir, then add a defoamer and continue stirring to obtain a casting solution; The casting liquid is scraped by a film scraper and then dried by electric heating and air blast to obtain a PVA water-soluble film with a color fixing function.

5. The method for preparing a PVA water-soluble film with a color fixing function according to claim 4, characterized in that: The preparation method of the color fixing agent comprises: Dimethyldiallyl ammonium chloride and allyl glycidyl ether are in a ratio of 1:1 to 4:1, and the allyl glycidyl ether ethanol solution is continuously dripped into a four-necked flask containing an aqueous solution of dimethyldiallyl ammonium chloride, and the temperature is raised to 75 to 80° C. by stirring, and then an initiator aqueous solution is continuously dripped, wherein the mass of the initiator in the initiator aqueous solution is 0.5% to 1.5% of the total mass of dimethyldiallyl ammonium chloride and allyl glycidyl ether; After the addition is completed, the reaction is kept at 60-90°C for 4-7 hours, and the obtained mixture is transferred to a small beaker and cooled to room temperature to obtain a colorless and transparent polymer of dimethyldiallylammonium chloride and allyl glycidyl ether, which is the color fixing agent.

6. The method for preparing a PVA water-soluble film with a color fixing function according to claim 4, characterized in that: The heating and stirring are performed under the constant temperature water bath conditions, wherein the heating and stirring temperature is 80-90° C., the stirring speed is 200-300 r / min, and the stirring time is 1-2 h.

7. The method for preparing a PVA water-soluble film with a color fixing function according to claim 4, characterized in that: The ultrasonic temperature of the ultrasonic oscillation treatment is 50-70° C., and the ultrasonic time is 0.5-2 h.

8. The method for preparing a PVA water-soluble film with a color fixing function according to claim 4, characterized in that: The stirring time of adding the plasticizer is 0.5 to 1 hour, and the stirring speed is 200 to 300 r / min. The stirring time of adding the defoamer and continuing to stir is 10 to 15 minutes, and the stirring speed is 200 to 300 r / min.

9. The method for preparing a PVA water-soluble film with a color fixing function according to claim 4, characterized in that: The drying time of the electric heating blast drying is 15 to 25 minutes, and the drying temperature is 110 to 130°C.

10. The role of the PVA water-soluble film with color fixing function as claimed in any one of claims 1 to 3 in improving the color fixing performance of fabrics.

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