Antibacterial and insect repellent packaging paper and preparation method thereof

Abstract

The present application relates to the technical field of packaging materials, and more specifically, it relates to an antibacterial and insect-repellent packaging paper and a preparation method thereof. An antibacterial and insect-repellent packaging paper is composed of a packaging base paper and an antibacterial and insect-repellent coating, and the antibacterial and insect-repellent coating is applied to the inner and outer surfaces of the packaging base paper; the antibacterial and insect-repellent coating includes the following raw materials in parts by weight: 80-120 parts of water, 15-25 parts of a polyvinyl alcohol composition, 6-10 parts of beeswax, 1.2-1.6 parts of an emulsifier, 4-6 parts of an antibacterial and insect-repellent additive, and 0.4-0.8 parts of a catalyst; the antibacterial and insect-repellent additive is a mixture of a silane coupling agent, a clove extract, and a Litsea cubeba extract. The antibacterial and insect-repellent packaging paper of the present application has excellent antibacterial and insect-repellent waterproof safety performance.

Description

Technical Field

[0001] The present application relates to the technical field of packaging materials, and more specifically, to an antibacterial and insect repellent packaging paper and a preparation method thereof. Background Art

[0002] Wrapping paper is a common paper material used to protect and package goods such as food or electronic products. It usually has good strength, toughness, pressure resistance and folding resistance. However, since wrapping paper has strong moisture absorption properties and contains rich nutrients required for mold survival, there is a possibility that wrapping paper will become moldy.

[0003] Antibacterial wrapping paper is a kind of special wrapping paper, which is mostly used for food packaging. In addition to ensuring food quality and reducing microbial contamination, it can also effectively reduce the addition of preservatives in food. However, the current antibacterial wrapping paper generally achieves antibacterial properties by coating an antibacterial coating on the surface of the base paper, and reduces the hygroscopicity of the wrapping paper by using a fluorinated water repellent. However, the compatibility of the antibacterial agent with the coating matrix is ​​poor and it is easy to migrate and precipitate, and the fluorinated water repellent is harmful to the human body. In addition, food is also easy to attract mosquitoes, but the antibacterial wrapping paper cannot block mosquitoes. Therefore, there is an urgent need for an antibacterial, insect-repellent, waterproof and harmless wrapping paper for food. Summary of the invention

[0004] In order to improve the antibacterial performance, insect repellent performance, waterproof performance and safety performance of packaging paper, the present application provides an antibacterial and insect repellent packaging paper and a preparation method thereof.

[0005] In the first aspect, the present application provides an antibacterial and insect repellent packaging paper and a preparation method thereof, which adopts the following technical scheme:

[0006] An antibacterial and insect repellent packaging paper, comprising a packaging base paper and an antibacterial and insect repellent coating, wherein the antibacterial and insect repellent coating is coated on the inner and outer surfaces of the packaging base paper;

[0007] The antibacterial and insect repellent coating comprises the following raw materials in parts by weight: 80-120 parts of water, 15-25 parts of a polyvinyl alcohol composition, 6-10 parts of beeswax, 1.2-1.6 parts of an emulsifier, 4-6 parts of an antibacterial and insect repellent additive and 0.4-0.8 parts of a catalyst; the antibacterial and insect repellent additive is a mixture of a silane coupling agent, a clove extract and a litsea cubeba extract.

[0008] Beeswax has excellent moisture-proof and water-resistant properties. When it is attached to the surface of packaging paper in the form of a film, beeswax will effectively reduce the hygroscopicity of the packaging paper. Moreover, compared with fluorine-containing water repellents, beeswax is a natural non-toxic substance and has no effect on human health.

[0009] However, the film-forming property of beeswax is relatively poor, and the physical strength of the oil film is relatively low, that is, the beeswax film is very prone to cracking, peeling and other undesirable phenomena. Since the polyvinyl alcohol composition has excellent film-forming property, when beeswax, polyvinyl alcohol composition and emulsifier are mixed and used, beeswax, polyvinyl alcohol composition and emulsifier will form an emulsion structure, thereby promoting the composite film to have both the excellent moisture and water resistance of beeswax and the excellent film-forming property of polyvinyl alcohol composition.

[0010] Clove extract contains substances such as eugenol, acetyl eugenol, caryophyllene, methyl salicylate and methyl n-amyl ketone. Among them, eugenol and acetyl eugenol have strong antibacterial effects on Aspergillus niger, Aspergillus flavus and Penicillium citrinum. The antibacterial mechanism of eugenol and acetyl eugenol is that eugenol and acetyl eugenol can destroy the cell membrane of bacteria, thereby leaking nucleic acids and proteins in bacterial cells, thereby achieving antibacterial effects.

[0011] In addition, eugenol in clove extract can also produce a pungent smell, which is extremely uncomfortable for mosquitoes. Moreover, eugenol can directly act on the nervous system and respiratory system of mosquitoes, destroying their vital activities and causing them to become paralyzed or die.

[0012] Litsea cubeba extract contains citral, citronellal, litsea cubeba oil, geraniol, linalool, methyl heptenone and other substances. Among them, citral, citronellal, geraniol and litsea cubeba oil have strong antibacterial effects on Aspergillus niger, Aspergillus flavus and Penicillium citrinum. The antibacterial properties of citral and citronellal are particularly prominent. The antibacterial mechanism is that citral and citronellal can directly denature bacterial proteins or enzymes, destroy bacterial tissue structures, inhibit biosynthesis, reduce the permeability of cell membranes or seal cell walls, and interfere with bacterial decomposition and metabolism.

[0013] In addition, the extract of Litsea cubeba contains phosgene, which can produce an extremely uncomfortable and irritating smell for mosquitoes, thus playing an insect repellent effect. In addition, the extract of Litsea cubeba also contains sedatives, which can destroy the nervous system of mosquitoes, making it difficult for them to grow and reproduce normally. At the same time, sedatives can also change the pH and ion balance in the mosquito's body, making it difficult for mosquitoes to survive.

[0014] Moreover, cloves and litsea cubeba are both natural non-toxic materials, and their presence in small amounts has no effect on human health.

[0015] Compared with using clove extract or litsea cubeba extract alone, the antibacterial and insect repellent additive prepared by mixing clove extract and litsea cubeba extract has both the phenolic system of clove extract and the aldehyde system of litsea cubeba extract, which effectively reduces the tolerance of bacteria to antibacterial substances and further improves the antibacterial effect of the antibacterial and insect repellent additive.

[0016] In addition, a silane coupling agent is also added to the antibacterial and insect repellent additive. When the silane coupling agent, clove extract and catalyst are mixed and stirred, the silanol bond obtained by hydrolysis of siloxane will react and connect with the eugenol in the clove extract. At the same time, the silanol bond can produce a condensation reaction with the hydroxyl group of the polyvinyl alcohol molecular chain. The citral in the Litsea cubeba extract can directly undergo a cross-linking reaction with the hydroxyl group on the polyvinyl alcohol molecular chain, thereby obtaining a polyvinyl alcohol-eugenol-citral cross-linking network, effectively improving the compatibility of the antibacterial and insect repellent additive with the polyvinyl alcohol composition, effectively improving the migration and precipitation resistance of the antibacterial and insect repellent additive, and indirectly improving the antibacterial and insect repellent effect of the antibacterial and insect repellent additive.

[0017] Preferably, the polyvinyl alcohol composition is a mixture of polyvinyl alcohol, chitosan and cellulose.

[0018] Polyvinyl alcohol, chitosan and cellulose all have excellent film-forming effects. Among them, chitosan also has excellent antibacterial properties. Its antibacterial mechanism is that chitosan can adsorb to bacterial cell membranes and cause them to precipitate, or penetrate the bacterial surface and enter the bacterial body to disrupt its metabolism, further reducing the bacterial tolerance to antibacterial substances and further improving the antibacterial effect of antibacterial and insect repellent additives.

[0019] However, chitosan is prone to swelling. When polyvinyl alcohol, chitosan and cellulose are mixed, the influence of chitosan on the film-forming properties of the antibacterial and insect repellent coating can be effectively reduced, thereby effectively improving the moisture and water resistance of the antibacterial and insect repellent coating.

[0020] Preferably, the mass ratio of polyvinyl alcohol, chitosan and cellulose is (8-10):(2-4):(1-3).

[0021] When the polyvinyl alcohol, chitosan and cellulose are in the above mass ratio, the antibacterial and insect repellent coating has better antibacterial and moisture-proof and water-resistant properties.

[0022] Preferably, the mass ratio of the silane coupling agent, clove extract and litsea cubeba extract is (10-14): (2-4): (3-5).

[0023] When the silane coupling agent, clove extract and litsea cubeba extract are used in the above mass ratio, the antibacterial and insect repellent coating has better antibacterial and insect repellent properties, and the distribution of the clove extract and litsea cubeba extract is more stable and not easy to precipitate.

[0024] Preferably, the silane coupling agent is octyl polymethylsiloxane and vinyl polydimethylsiloxane, or a mixture of both.

[0025] Octyl polymethylsiloxane and vinyl polydimethylsiloxane are both silane coupling agents, among which octyl polymethylsiloxane is a long-chain alkyl silane coupling agent, which has excellent waterproof performance, but the coupling effect is slightly poor. Vinyl polydimethylsiloxane has excellent coupling effect, so when octyl polymethylsiloxane and vinyl polydimethylsiloxane are mixed, the composite silane coupling agent will have better waterproof performance and coupling effect.

[0026] Preferably, the silane coupling agent is a mixture of octyl polymethylsiloxane and vinyl polydimethylsiloxane, and the mass fraction of octyl polymethylsiloxane and vinyl polydimethylsiloxane is (2-4):1.

[0027] When octyl polymethylsiloxane and vinyl polydimethylsiloxane are used in the above mass ratio, the silane coupling agent not only has an excellent coupling effect, but also can make the antibacterial and insect repellent coating have better moisture-proof and water-resistant properties.

[0028] Preferably, the emulsifier is one of polyquaternium-37, Span 20 and Tween-80.

[0029] Polyquaternium-37, Span 20 and Tween-80 are all emulsifiers, but polyquaternium-37 also has the properties of promoting film formation, dispersion and antibacterial properties. Therefore, polyquaternium-37 is relatively better.

[0030] Preferably, the preparation method of the clove extract is: firstly, the cloves are crushed and dried, then the clove powder is soaked in an acetone solvent and allowed to stand at a temperature of 25° C. for 24 hours, then extracted three times with an acetone solution, and finally 1 g / ml of clove extract is obtained;

[0031] The preparation method of the Litsea cubeba extract is as follows: firstly, the Litsea cubeba is crushed and dried, then the Litsea cubeba powder is soaked in an acetone solvent and allowed to stand at 25°C for 24 hours, then extracted three times with an acetone solution, and finally 1 g / ml of the Litsea cubeba extract is obtained.

[0032] In a second aspect, the present application provides a method for preparing an antibacterial and insect repellent packaging paper, using the following technical solution:

[0033] A method for preparing an antibacterial and insect repellent packaging paper comprises the following steps:

[0034] S1, adding a polyvinyl alcohol composition to water, followed by mixing and stirring at 80-100° C. to obtain an aqueous solution of the polyvinyl alcohol composition;

[0035] S2, adding beeswax, an emulsifier and an antibacterial and insect repellent additive to the aqueous solution of the polyvinyl alcohol composition in sequence, then adjusting the pH value to a weak alkaline state and stirring and emulsifying for 2-4 hours, and finally homogenizing to obtain an antibacterial and insect repellent emulsion;

[0036] S3, coating the antibacterial and insect repellent emulsion on the inner and outer surfaces of the packaging base paper, and then drying it at 140-160° C. to obtain the antibacterial and insect repellent packaging paper.

[0037] In summary, this application has the following beneficial effects:

[0038] 1. When beeswax, polyvinyl alcohol composition and emulsifier are mixed and used, beeswax, polyvinyl alcohol composition and emulsifier will form an emulsion structure, thereby promoting the composite film to have both the excellent moisture-proof and water-resistant properties of beeswax and the excellent film-forming properties of polyvinyl alcohol composition.

[0039] 2. Both clove and litsea cubeba are natural non-toxic materials. Compared with using clove extract or litsea cubeba extract alone, the antibacterial and insect repellent additive prepared by mixing clove extract and litsea cubeba extract has both the phenolic system of clove extract and the aldehyde system of litsea cubeba extract, which further improves the antibacterial effect of the antibacterial and insect repellent additive.

[0040] 3. When the silane coupling agent, clove extract and catalyst are mixed and stirred, the silanol bond obtained by hydrolysis of siloxane will react and connect with the eugenol in the clove extract. At the same time, the silanol bond can produce a condensation reaction with the hydroxyl group of the polyvinyl alcohol molecular chain. The citral in the Litsea cubeba extract can directly undergo a cross-linking reaction with the hydroxyl group on the polyvinyl alcohol molecular chain, thereby obtaining a polyvinyl alcohol-eugenol-citral cross-linking network, effectively improving the compatibility of the antibacterial and insect repellent additive with the polyvinyl alcohol composition, effectively improving the migration and precipitation resistance of the antibacterial and insect repellent additive, and indirectly improving the antibacterial and insect repellent effect of the antibacterial and insect repellent additive. DETAILED DESCRIPTION

[0041] The present application is further described in detail below in conjunction with Examples 1-16 and Comparative Examples 1-4.

[0042] raw material

[0043] Beeswax CAS: 8006-40-4; Polyvinyl alcohol CAS: 9002-89-5; Chitosan CAS: 9012-76-4; Cellulose CAS: 9004-32-4; ​​Octyl polymethylsiloxane CAS: 17955-88-3; Vinyl polydimethylsiloxane CAS: 53529-60-5; KARSTEDT catalyst CAS: 81032-58-8; Polyquaternium-37 CAS: 26161-33-1; Span 20 CAS: 1338-39-2; Tween-80 CAS: 9005-65-6; Acetone CAS: 67-64-1.

[0044] Example

[0045] Example 1

[0046] An antibacterial and insect repellent packaging paper, the preparation method of which comprises the following steps:

[0047] S1. Add 20 kg of polyvinyl alcohol to 100 kg of deionized water, and then mix and stir to dissolve at 90° C. for 6 hours at a stirring speed of 200 r / min to obtain an aqueous solution of a polyvinyl alcohol composition;

[0048] S2, to the aqueous solution of the polyvinyl alcohol composition, 8 kg of beeswax, 1.4 kg of Span 20, 5 kg of antibacterial and insect repellent additives and 0.6 kg of catalyst-KARSTEDT were added in sequence, and then the pH value was adjusted to 8 with a dilute sodium hydroxide solution and stirred and emulsified for 3 hours at a stirring speed of 1000 r / min, and finally homogenized for 5 minutes to obtain an antibacterial and insect repellent emulsion;

[0049] S3, coating the antibacterial and insect repellent emulsion on the inner and outer surfaces of the packaging base paper with a coating thickness of 2 mm, and then drying at 150° C. to obtain the antibacterial and insect repellent packaging paper.

[0050] Among them, the antibacterial and anti-insect additive is a mixture of vinyl polydimethylsiloxane, clove extract and Litsea cubeba extract, and the mass ratio of vinyl polydimethylsiloxane, clove extract and Litsea cubeba extract is 12:3:4.

[0051] The preparation method of clove extract is as follows: first, 15g of cloves are crushed and dried, and passed through an 80-mesh sieve, then the clove powder is soaked in 75ml of acetone solvent, and allowed to stand at a temperature of 25°C for 24h, and then extracted three times with acetone solution, each extraction using 50ml of acetone solvent, and finally concentrated to 15ml to obtain 1g / ml clove extract;

[0052] The preparation method of Litsea cubeba extract is as follows: first, 15g of Litsea cubeba is crushed and dried, and passed through an 80-mesh sieve. Subsequently, the Litsea cubeba powder is soaked in 75ml of acetone solvent and allowed to stand at 25°C for 24h. Thereafter, the extract is performed three times with acetone solution, using 50ml of acetone solvent for each extraction, and finally the volume is concentrated to 15ml to obtain 1g / ml Litsea cubeba extract.

[0053] Example 2-3

[0054] The difference from Example 1 is that the added amounts of the components of the antibacterial and insect repellent emulsion are different, as shown in Table 1.

[0055] Table 1 Addition amount of each component of the antibacterial and insect repellent emulsion in Examples 1-3 / kg

[0056]

[0057]

[0058] Example 4

[0059] The difference from Example 1 is that the mass ratio of vinyl dimethicone, clove extract and litsea cubeba extract is 10:4:3.

[0060] Example 5

[0061] The difference from Example 1 is that the mass ratio of vinyl dimethicone, clove extract and litsea cubeba extract is 14:2:5.

[0062] Example 6

[0063] The difference from Example 1 is that the mass ratio of vinyl dimethicone, clove extract and litsea cubeba extract is 8:6:1.

[0064] Example 7

[0065] The difference from Example 1 is that the mass ratio of vinyl dimethicone, clove extract and litsea cubeba extract is 16:1:7.

[0066] Example 8

[0067] The difference from Example 1 is that Span 20 is replaced by Tween-80 in the same amount.

[0068] Example 9

[0069] The difference from Example 1 is that Span 20 is replaced by the same amount of Polyquaternium-37.

[0070] Example 10

[0071] The difference from Example 9 is that polyvinyl alcohol is replaced by a mixture of polyvinyl alcohol, chitosan and cellulose, and the mass ratio of polyvinyl alcohol, chitosan and cellulose is 9:3:2.

[0072] Embodiment 11

[0073] The difference from Example 9 is that the mass ratio of polyvinyl alcohol, chitosan and cellulose is 8:4:1.

[0074] Example 12

[0075] The difference from Example 9 is that the mass ratio of polyvinyl alcohol, chitosan and cellulose is 10:2:3.

[0076] Embodiment 13

[0077] The difference from Example 10 is that vinyl dimethicone is replaced with the same amount of octyl methicone.

[0078] Embodiment 14

[0079] The difference from Example 12 is that the vinyl dimethicone is replaced by a mixture of octyl dimethicone and vinyl dimethicone in the same amount, and the mass ratio of octyl dimethicone to vinyl dimethicone is 2:1.

[0080] Embodiment 15

[0081] The difference from Example 14 is that the mass ratio of octyl polymethylsiloxane to vinyl polydimethylsiloxane is 3:1.

[0082] Example 16

[0083] The difference from Example 14 is that the mass ratio of octyl polymethylsiloxane to vinyl polydimethylsiloxane is 4:1.

[0084] Comparative Example

[0085] Comparative Example 1

[0086] The difference from Example 1 is that the inner and outer surfaces of the packaging base paper are no longer coated with the antibacterial and insect repellent emulsion.

[0087] Comparative Example 2

[0088] The difference from Example 1 is that only clove extract is added to the antibacterial and insect repellent additive.

[0089] Comparative Example 3

[0090] The difference from Example 1 is that only the extract of Litsea cubeba is added to the antibacterial and anthelmintic additive.

[0091] Comparative Example 4

[0092] The difference from Example 1 is that vinyl polydimethylsiloxane is no longer added to the antibacterial and insect repellent additive, while the added amounts of clove extract and litsea cubeba extract remain unchanged.

[0093] Performance testing

[0094] 1. Antibacterial Test

[0095] Three samples were taken from Examples 1-16 and Comparative Examples 1-4, respectively, and then antibacterial tests were performed on the samples according to QB / T 2591-2003 "Test Methods and Antibacterial Effects of Antibacterial Plastics" to obtain the antibacterial rates and take the average values. The test data are shown in Table 2.

[0096] 2. Anti-insect test

[0097] Three samples were taken from each of Examples 1-7, Examples 13-16 and Comparative Examples 1-4, and then the samples were prepared into a 10 cm × 10 cm × 10 cm box, and then candies were added into the box, and holes were opened on the surface of the box. Then 200 ants were added to the outside of the box, and the number of ants in the box was recorded after two hours and the average value was taken. The test data is shown in Table 2.

[0098] 3. Waterproof test

[0099] Three samples were taken from Examples 1-3, Examples 10-16 and Comparative Example 1, respectively. The samples were then prepared into 10 cm×10 cm paperboards and the original mass of the paperboards was weighed, recorded as M0. The samples were then tilted and fixed on a 90° bracket, and 50 g of deionized water was sprayed on the surface of the samples, and then the water absorption mass M1 of the samples was weighed.

[0100] Finally, the water absorption is calculated, water absorption = M1-M0, and the test data is shown in Table 3.

[0101] Table 2 Antibacterial and insect repellent test table of Examples 1-16 and Comparative Examples 1-4

[0102]

[0103]

[0104] Table 3 Waterproof performance of Examples 1-3, Examples 10-16 and Comparative Example 1

[0105] Water absorption / g Water absorption / g Example 1 2.2g Embodiment 13 1.5g Example 2 2.4g Embodiment 14 3.4g Example 3 2.5g Embodiment 15 2.0g Example 10 5.4g Example 16 1.7g Embodiment 11 5.8g Comparative Example 1 36.6g Example 12 5.0g

[0106] With reference to Comparative Example 1, Examples 1-3 and in combination with Tables 2-3, it can be seen that, relative to Comparative Example 1, the antibacterial, insect repellent and waterproof properties of Examples 1-3 are significantly improved, which indicates that the antibacterial, insect repellent emulsion can effectively improve the antibacterial, insect repellent and waterproof properties of packaging paper.

[0107] With reference to Comparative Examples 1-4 and Example 1 and in combination with Table 2, it can be seen that, relative to Comparative Example 1, the antibacterial and insect repellent properties of Comparative Examples 2-3 are significantly improved, which indicates that the clove extract and the litsea cubeba extract have excellent antibacterial and insect repellent properties.

[0108] Among them, clove extract contains substances such as eugenol, acetyl eugenol, caryophyllene, methyl salicylate and methyl n-amyl ketone. Among them, eugenol and acetyl eugenol have strong antibacterial effects on Aspergillus niger, Aspergillus flavus and Penicillium citrinum. The antibacterial mechanism of eugenol and acetyl eugenol is that eugenol and acetyl eugenol can destroy the cell membrane of bacteria, thereby leaking nucleic acids and proteins in bacterial cells, thereby achieving antibacterial effects.

[0109] In addition, eugenol in clove extract can also produce a pungent smell, which is extremely uncomfortable for mosquitoes. Moreover, eugenol can directly act on the nervous system and respiratory system of mosquitoes, destroying their vital activities and causing them to become paralyzed or die.

[0110] Litsea cubeba extract contains citral, citronellal, litsea cubeba oil, geraniol, linalool, methyl heptenone and other substances. Among them, citral, citronellal, geraniol and litsea cubeba oil have strong antibacterial effects on Aspergillus niger, Aspergillus flavus and Penicillium citrinum. The antibacterial properties of citral and citronellal are particularly prominent. The antibacterial mechanism is that citral and citronellal can directly denature bacterial proteins or enzymes, destroy bacterial tissue structures, inhibit biosynthesis, reduce the permeability of cell membranes or seal cell walls, and interfere with bacterial decomposition and metabolism.

[0111] In addition, the extract of Litsea cubeba contains phosgene, which can produce an extremely uncomfortable and irritating smell for mosquitoes, thus playing an insect repellent effect. In addition, the extract of Litsea cubeba also contains sedatives, which can destroy the nervous system of mosquitoes, making it difficult for them to grow and reproduce normally. At the same time, sedatives can also change the pH and ion balance in the mosquito's body, making it difficult for mosquitoes to survive.

[0112] Compared with Comparative Example 4, the antibacterial and insect repellent properties of Comparative Examples 2-3 are relatively poor. The reason is that, compared with the use of clove extract or Litsea cubeba extract alone, after the clove extract and Litsea cubeba extract are mixed for use, the antibacterial and insect repellent packaging paper has both the phenolic system of clove extract and the aldehyde system of Litsea cubeba extract, which effectively reduces the tolerance of bacteria to antibacterial substances and further improves the antibacterial effect of the antibacterial and insect repellent additive.

[0113] Compared with Comparative Example 4, Example 1 has more excellent antibacterial and insect repellent properties. The reason is that when the silane coupling agent, clove extract and catalyst are mixed and stirred, the silanol bond obtained by hydrolysis of siloxane will react and connect with the eugenol in the clove extract. At the same time, the silanol bond can produce a condensation reaction with the hydroxyl group of the polyvinyl alcohol molecular chain. The citral in the Litsea cubeba extract can directly undergo a cross-linking reaction with the hydroxyl group on the polyvinyl alcohol molecular chain, thereby obtaining a polyvinyl alcohol-eugenol-citral cross-linking network, effectively improving the compatibility of the antibacterial and insect repellent additive with the polyvinyl alcohol composition, effectively improving the migration and precipitation resistance of the antibacterial and insect repellent additive, and indirectly improving the antibacterial and insect repellent effect of the antibacterial and insect repellent additive.

[0114] With reference to Example 1, Examples 4-7 and in combination with Table 2, it can be seen that the antibacterial and insect repellent properties of Example 1 are the most outstanding, which shows that when the vinyl polydimethylsiloxane, clove extract and litsea cubeba extract are used in the mass ratio of Example 1, the antibacterial and insect repellent packaging paper prepared has a better antibacterial and insect repellent effect.

[0115] With reference to Example 1, Examples 8-9 and in combination with Table 2, it can be seen that the antibacterial performance of Example 9 is the most outstanding. The reason is that polyquaternium-37 also has the properties of promoting film formation, promoting dispersion and antibacterial properties.

[0116] With reference to Example 1, Examples 10-12 and in combination with Tables 2-3, it can be seen that, relative to Example 1, Examples 10-12 have better antibacterial properties, among which the antibacterial property of Example 11 is particularly outstanding. This shows that when polyvinyl alcohol, chitosan and cellulose adopt the mass proportion of Example 11, the antibacterial and insect repellent packaging paper has better antibacterial properties.

[0117] At the same time, compared with Example 1, the waterproof performance of Examples 10-12 is significantly worse. The reason is that although the addition of chitosan can effectively improve the antibacterial performance of the antibacterial and insect repellent packaging paper, chitosan is very easy to swell. When polyvinyl alcohol, chitosan and cellulose are mixed, the effect of chitosan on the film-forming properties of the antibacterial and insect repellent coating can be effectively reduced, among which the effect of Example 12 is the weakest.

[0118] In summary, Example 10 has both excellent antibacterial and waterproof properties. Therefore, the mass ratio of polyvinyl alcohol, chitosan and cellulose in Example 10 is relatively better.

[0119] With reference to Example 10, Examples 13-16 and in combination with Table 2-3, it can be seen that, relative to Example 10, the waterproof performance of Example 13 is significantly improved, but the antibacterial performance of Example 13 is significantly reduced. The reason is that octyl polymethylsiloxane is a long-chain alkyl silane coupling agent, which has excellent waterproof performance, but the coupling effect is slightly poor.

[0120] Compared with Example 13, the antibacterial properties of Examples 14-16 are significantly improved, among which Example 14 has the best antibacterial property. Compared with Example 13, the waterproof properties of Examples 14-16 are significantly deteriorated, among which Example 16 has the best waterproof property. The reason is that vinyl polydimethylsiloxane has an excellent coupling effect. Therefore, when octyl polymethylsiloxane and vinyl polydimethylsiloxane are mixed, especially when the mass ratio of Example 15 is used, the composite silane coupling agent will have better waterproof and antibacterial properties.

[0121] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An antibacterial and insect repellent packaging paper, characterized in that: It consists of packaging paper and an antibacterial and insect repellent coating, wherein the antibacterial and insect repellent coating is coated on the inner and outer surfaces of the packaging paper; The antibacterial and insect repellent coating comprises the following raw materials in parts by weight: 80-120 parts of water, 15-25 parts of a polyvinyl alcohol composition, 6-10 parts of beeswax, 1.2-1.6 parts of an emulsifier, 4-6 parts of an antibacterial and insect repellent additive, and 0.4-0.8 parts of a catalyst; the antibacterial and insect repellent additive is a mixture of a silane coupling agent, a clove extract, and a litsea cubeba extract; The mass ratio of the silane coupling agent, clove extract and litsea cubeba extract is (10-14): (2-4): (3-5); The preparation method of the clove extract is as follows: firstly, the cloves are crushed and dried, then the clove powder is soaked in an acetone solvent, and the mixture is allowed to stand at a temperature of 25° C. for 24 hours, and then the acetone solution is used for three extractions, and finally 1 g / ml of the clove extract is obtained by extraction; The preparation method of the Litsea cubeba extract is as follows: firstly, the Litsea cubeba is crushed and dried, then the Litsea cubeba powder is soaked in an acetone solvent, and the mixture is allowed to stand at a temperature of 25° C. for 24 hours, and then the mixture is extracted three times with an acetone solution, and finally 1 g / ml of the Litsea cubeba extract is obtained by extraction; The polyvinyl alcohol composition is a mixture of polyvinyl alcohol, chitosan and cellulose; The mass ratio of the polyvinyl alcohol, chitosan and cellulose is (8-10): (2-4): (1-3).

2. The antibacterial and insect repellent packaging paper according to claim 1, characterized in that: The silane coupling agent is one or a mixture of octyl polymethylsiloxane and vinyl polydimethylsiloxane.

3. The antibacterial and insect repellent packaging paper according to claim 2, characterized in that: The silane coupling agent is a mixture of octyl polymethylsiloxane and vinyl polydimethylsiloxane, and the mass fraction of octyl polymethylsiloxane and vinyl polydimethylsiloxane is (2-4):

1.

4. The antibacterial and insect repellent packaging paper according to claim 1, characterized in that: The emulsifier is one of polyquaternium-37, Span 20 and Tween-80.

5. A method for preparing the antibacterial and insect repellent packaging paper according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, adding a polyvinyl alcohol composition to water, followed by mixing and stirring at 80-100° C. to obtain an aqueous solution of the polyvinyl alcohol composition; S2, adding beeswax, emulsifier, antibacterial and insect repellent additive and catalyst to the aqueous solution of the polyvinyl alcohol composition in sequence, then adjusting the pH value to weak alkalinity and stirring and emulsifying for 2-4 hours, and finally homogenizing to obtain an antibacterial and insect repellent emulsion; S3, coating the antibacterial and insect repellent emulsion on the inner and outer surfaces of the packaging base paper, and then drying it at 140-160° C. to obtain the antibacterial and insect repellent packaging paper.

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