CN113881393A - Silicone adhesive with mildew-proof effect - Google Patents
Silicone adhesive with mildew-proof effect Download PDFInfo
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- CN113881393A CN113881393A CN202111296960.3A CN202111296960A CN113881393A CN 113881393 A CN113881393 A CN 113881393A CN 202111296960 A CN202111296960 A CN 202111296960A CN 113881393 A CN113881393 A CN 113881393A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Inorganic Chemistry (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to the technical field of sealant preparation, and particularly discloses a silicone adhesive with a mildew-proof effect. The silicone adhesive with the mildew-proof effect is prepared by taking polydimethylsiloxane as a raw material, and a composite mildew-proof agent is added in the process of preparing the silicone adhesive with the mildew-proof effect; the composite mildew preventive comprises nano zinc oxide and camphor wood powder extract; wherein the weight ratio of the nano zinc oxide to the camphor wood powder extract is 5-10: 1. The silicone adhesive with the mildew-proof effect has an inhibition effect on conventional mildew and bacteria, and also has an inhibition effect on methicillin-resistant staphylococcus aureus (MRSA). Because of the bacteriostatic and mildewproof effects, the antibacterial and mildewproof fabric can be used in the dark environment such as kitchens, toilets and the like; especially, the application of the compound in the washrooms of hospitals and public places has important significance for inhibiting the spread of methicillin-resistant staphylococcus aureus.
Description
Technical Field
The invention relates to the technical field of sealant preparation, in particular to a silicone adhesive with a mildew-proof effect.
Background
The sealant is an adhesive used for filling the configured gap to play a role in sealing, needs to deform along with the shape of the sealing surface, is not easy to flow, and has certain cohesiveness; can play at least one or more of the functions of leakage prevention, water prevention, vibration prevention, sound insulation and the like. The silicone sealant is a paste prepared by mixing polydimethylsiloxane as a main raw material and auxiliary agents such as a cross-linking agent, a filler, a catalyst and the like in a vacuum state.
A large amount of silicone sealant is also used in the decoration process of kitchens and toilets; since kitchens and toilets are usually in relatively dark and humid environments; if a common silicone sealant is used, mildew and bacteria are easy to grow. Therefore, silicone sealants used in kitchens and bathrooms must have certain mildew-proof and antibacterial properties. The Chinese invention patent 201610361802.4 discloses a long-acting high-humidity mildew-proof silicone sealant which is prepared by taking alpha-hydrogen-omega-hydroxy-polydimethylsiloxane as a raw material, has a certain mildew-proof effect, and can be used in the dark environment of kitchens, toilets and the like.
Methicillin-resistant staphylococcus aureus (MRSA) is a common drug-resistant bacterium, which is one of the important pathogenic bacteria of nosocomial and community infections; however, although the existing silicone sealant has antibacterial and mildewproof effects, the antibacterial effect on methicillin-resistant staphylococcus aureus is not obvious. Therefore, the silicone sealant which is resistant to methicillin-resistant staphylococcus aureus is provided, and has important significance for inhibiting the spread of methicillin-resistant staphylococcus aureus when being used in toilets in hospitals and public places.
Disclosure of Invention
In order to overcome at least one technical problem in the prior art, the invention provides a silicone adhesive with mildew-proof effect.
The technical scheme for solving the technical problems is as follows:
a silicone adhesive with mildew-proof function is prepared by taking polydimethylsiloxane as a raw material, and a compound mildew-proof agent is added in the process of preparing the silicone adhesive with mildew-proof function;
the composite mildew preventive comprises nano zinc oxide and camphor wood powder extract; wherein the weight ratio of the nano zinc oxide to the camphor wood powder extract is 5-10: 1.
In the preparation process of the silicone adhesive, the composite mildew inhibitor consisting of nano zinc oxide and camphor wood powder extract is innovatively added; after the composite mildew preventive consisting of the nano zinc oxide and the camphor wood powder extract is added into the silicone adhesive, the silicone adhesive not only has an inhibiting effect on conventional mould and bacteria, but also has an inhibiting effect on methicillin-resistant staphylococcus aureus (MRSA).
Preferably, the weight ratio of the nano zinc oxide to the camphor wood powder extract is 9: 1.
Preferably, the weight of the mildew preventive accounts for 0.1-5% of the total weight of the raw materials of the silicone adhesive with the mildew preventive effect.
More preferably, the dosage of the mildew preventive is 0.5-3% of the total weight of the raw materials of the silicone adhesive with the mildew preventive effect.
Most preferably, the mildew inhibitor is used in an amount of 1% of the total weight of the raw materials of the silicone adhesive with mildew-proof effect.
Preferably, the camphor wood powder extract is prepared by the following method: taking camphor wood powder, adding an organic solvent, heating, refluxing and extracting for 1-2 hours, concentrating an extracting solution, and drying to obtain the camphor wood powder extract;
the organic solvent consists of chloroform, methanol and ethyl acetate.
The inventor surprisingly found in the experimental process that: the antibacterial effect of the camphor wood powder extract obtained by extracting camphor wood powder with a solvent consisting of chloroform, methanol and ethyl acetate on methicillin-resistant staphylococcus aureus (MRSA) after being combined with nano zinc oxide is far higher than the antibacterial effect of the camphor wood powder extract obtained by extracting with a single solvent such as conventional ethanol or methanol on methicillin-resistant staphylococcus aureus (MRSA) after being combined with nano zinc oxide.
Preferably, the using amount ratio of the camphor wood powder to the organic solvent is 1g: 8-15 mL.
More preferably, the volume ratio of chloroform to methanol to ethyl acetate is 5-10: 2-4: 1-2.
Most preferably, the volume ratio of chloroform, methanol and ethyl acetate is 6:3: 1.
Preferably, the weight of the dispersant accounts for 1-3% of the total weight of the raw materials of the silicone adhesive with the mildew-proof effect.
Further preferably, the dispersant is a composite dispersant; the composite dispersant comprises a dispersant A and a dispersant B;
the dispersant A is prepared by a method comprising the following steps: dissolving 10-15 parts by weight of polyvinyl alcohol in 200-300 parts by weight of DMSO solvent, adding 10-20 parts by weight of benzoyl chloride and 20-30 parts by weight of dodecenyl succinic anhydride, uniformly stirring, and reacting at 80-100 ℃ for 3-6 h; after the reaction is finished, concentrating to remove the solvent, and drying the solid to obtain the dispersant A.
Most preferably, the dispersant A is prepared by a method comprising the following steps: dissolving 12 parts by weight of polyvinyl alcohol in 240 parts by weight of DMSO solvent, adding 14 parts by weight of benzoyl chloride and 26 parts by weight of dodecenyl succinic anhydride, uniformly stirring, and reacting at 90 ℃ for 5 hours; after the reaction is finished, concentrating to remove the solvent, and drying the solid to obtain the dispersant A.
More preferably, the dispersant B is zinc stearate.
Preferably, the weight ratio of the dispersant A to the dispersant B is 1-3: 1.
The inventor further researches show that the dispersing agent also plays an important role in the fact that whether the composite mildew preventive consisting of the nano zinc oxide and the camphor wood powder extract can play the greatest role in resisting methicillin-resistant staphylococcus aureus (MRSA) in the silicone adhesive. Under the condition of a certain dosage of the composite mildew inhibitor, the composite mildew inhibitor is a composite dispersant consisting of a dispersant A and a dispersant B zinc stearate, wherein the dispersant A is prepared from polyvinyl alcohol, benzoyl chloride and dodecenyl succinic anhydride, and compared with a conventional dispersant, the composite mildew inhibitor can further greatly improve the methicillin-resistant staphylococcus aureus (MRSA) resistance of the silicone adhesive.
Has the advantages that: according to the silicone adhesive, a brand-new composite mildew inhibitor consisting of nano zinc oxide and camphor wood powder extract is added, so that the silicone adhesive not only has an inhibiting effect on conventional mildew and bacteria, but also has an inhibiting effect on methicillin-resistant staphylococcus aureus (MRSA). Because of the bacteriostatic and mildewproof effects, the antibacterial and mildewproof fabric can be used in the dark environment such as kitchens, toilets and the like; especially, the application of the compound in the washrooms of hospitals and public places has important significance for inhibiting the spread of methicillin-resistant staphylococcus aureus.
Detailed Description
The present invention is further explained below with reference to specific examples, which are not intended to limit the present invention in any way.
As the polydimethylsiloxanes used in the following examples, those having a viscosity (cp at 25 ℃) of 5000 were used.
Example 1 Silicone adhesive with mold preventive action
The raw materials comprise the following components in parts by weight: 70 parts of polydimethylsiloxane; 20 parts of nano calcium carbonate; 6 parts of crosslinking agent methyltrimethoxysilane; 1 part of dibutyltin dilaurate serving as a catalyst; 1 part of a composite mildew inhibitor; 2 parts of a composite dispersant;
the composite mildew preventive consists of nano zinc oxide and camphor wood powder extract according to a weight ratio of 9: 1;
the camphor wood powder extract is prepared by the following method: taking camphor wood powder, then adding an organic solvent for heating reflux extraction for 1.5h, concentrating an extracting solution, and drying to obtain the camphor wood powder extract; wherein the dosage ratio of the camphor wood powder to the organic solvent is 1g:10 mL; the organic solvent consists of chloroform, methanol and ethyl acetate in a volume ratio of 6:3: 1;
the composite dispersant consists of a dispersant A and a dispersant B in a weight ratio of 2: 1; the dispersant A is tristearin; the dispersant B is zinc stearate.
The preparation method of the silicone adhesive with the mildew-proof effect comprises the following steps: firstly, putting polydimethylsiloxane, nano calcium carbonate, a composite mildew preventive and a composite dispersing agent into a high-speed stirrer, and stirring for 30min under the vacuum degree of-0.05 Mpa; and then adding a crosslinking agent methyl trimethoxy silane and a catalyst dibutyltin dilaurate, and stirring for 120min under the vacuum degree of-0.09 Mpa to obtain the silicone adhesive with the mildew-proof effect.
Example 2 Silicone adhesive with mold resistance
The raw materials comprise the following components in parts by weight: the same as in example 1.
The compound mildew preventive comprises the following components: the same as in example 1.
The composite dispersant consists of a dispersant A and a dispersant B in a weight ratio of 2: 1; the dispersant A is prepared by the following method: dissolving 12 parts by weight of polyvinyl alcohol in 240 parts by weight of DMSO solvent, adding 14 parts by weight of benzoyl chloride and 26 parts by weight of dodecenyl succinic anhydride, uniformly stirring, and reacting at 90 ℃ for 5 hours; after the reaction is finished, concentrating to remove the solvent, and drying the solid to obtain the dispersant A; the dispersant B is zinc stearate.
The preparation method of the silicone adhesive with the mildew-proof effect comprises the following steps: the same as in example 1.
Example 2 differs from example 1 in that: the dispersant A described in example 2 was prepared from polyvinyl alcohol, benzoyl chloride and dodecenyl succinic anhydride; while dispersant A described in example 1 was glycerol tristearate, a conventional dispersant.
Comparative example 1 Silicone adhesive with mold-proofing action
The raw materials comprise the following components in parts by weight: 70 parts of polydimethylsiloxane; 20 parts of nano calcium carbonate; 6 parts of crosslinking agent methyltrimethoxysilane; 1 part of dibutyltin dilaurate serving as a catalyst; 1 part of a composite mildew inhibitor;
the compound mildew preventive comprises the following components: the same as in example 1.
The preparation method of the silicone adhesive with the mildew-proof effect comprises the following steps: firstly, putting polydimethylsiloxane, nano calcium carbonate and the composite mildew preventive into a high-speed stirrer, and stirring for 30min under the vacuum degree of-0.05 Mpa; and then adding a crosslinking agent methyl trimethoxy silane and a catalyst dibutyltin dilaurate, and stirring for 120min under the vacuum degree of-0.09 Mpa to obtain the silicone adhesive with the mildew-proof effect.
Comparative example 1 differs from examples 1 and 2 in that no dispersant was added in comparative example 1.
Comparative example 2 Silicone adhesive with mold resistance
The raw materials comprise the following components in parts by weight: the same as in example 1.
The compound mildew preventive comprises the following components: the same as in example 1.
The composite dispersant comprises the following components: the same as in example 1.
The composite mildew preventive consists of nano zinc oxide and camphor wood powder extract according to a weight ratio of 9: 1;
the camphor wood powder extract is prepared by the following method: taking camphor wood powder, then adding an organic solvent for heating reflux extraction for 1.5h, concentrating an extracting solution, and drying to obtain the camphor wood powder extract; wherein the dosage ratio of the camphor wood powder to the organic solvent is 1g:10 mL; the organic solvent is ethanol;
the preparation method of the silicone adhesive with the mildew-proof effect comprises the following steps: the same as in example 1.
Comparative example 2 differs from example 1 in that: the preparation method of the camphor wood powder extract is different, and the camphor wood powder extract in the comparative example 2 is obtained by ethanol extraction.
Comparative example 3 Silicone adhesive with mold resistance
The raw materials comprise the following components in parts by weight: the same as in example 1.
The compound mildew preventive comprises the following components: the same as in example 1.
The composite dispersant comprises the following components: the same as in example 1.
The composite mildew preventive consists of nano zinc oxide and camphor wood powder extract according to a weight ratio of 9: 1;
the camphor wood powder extract is prepared by the following method: taking camphor wood powder, then adding an organic solvent for heating reflux extraction for 1.5h, concentrating an extracting solution, and drying to obtain the camphor wood powder extract; wherein the dosage ratio of the camphor wood powder to the organic solvent is 1g:10 mL; the organic solvent consists of chloroform and methanol in a volume ratio of 6: 3;
the preparation method of the silicone adhesive with the mildew-proof effect comprises the following steps: the same as in example 1.
Comparative example 3 differs from example 1 in that: the preparation method of the camphor wood powder extract is different, and the camphor wood powder extract in the comparative example 3 is obtained by extracting with an organic solvent consisting of chloroform and methanol.
Comparative example 4 Silicone adhesive with mold preventive action
The raw materials comprise the following components in parts by weight: the same as in example 1.
The compound mildew preventive comprises the following components: the same as in example 1.
The composite dispersant consists of a dispersant A and a dispersant B in a weight ratio of 2: 1; the dispersant A is prepared by the following method: dissolving 12 parts by weight of polyvinyl alcohol in 240 parts by weight of DMSO solvent, adding 40 parts by weight of benzoyl chloride, uniformly stirring, and reacting at 90 ℃ for 5 hours; after the reaction is finished, concentrating to remove the solvent, and drying the solid to obtain the dispersant A; the dispersant B is zinc stearate.
The preparation method of the silicone adhesive with the mildew-proof effect comprises the following steps: the same as in example 1.
Comparative example 4 differs from example 2 in that: the preparation raw materials of the dispersing agent A are different; the dispersant A described in example 2 was prepared from polyvinyl alcohol, benzoyl chloride and dodecenyl succinic anhydride; dispersant a described in comparative example 4 was prepared from polyvinyl alcohol and benzoyl chloride.
Comparative example 5 Silicone adhesive with mold preventive action
The raw materials comprise the following components in parts by weight: the same as in example 1.
The compound mildew preventive comprises the following components: the same as in example 1.
The composite dispersant consists of a dispersant A and a dispersant B in a weight ratio of 2: 1; the dispersant A is prepared by the following method: dissolving 12 parts by weight of polyvinyl alcohol in 240 parts by weight of DMSO solvent, adding 40 parts by weight of dodecenyl succinic anhydride, uniformly stirring, and reacting at 90 ℃ for 5 hours; after the reaction is finished, concentrating to remove the solvent, and drying the solid to obtain the dispersant A; the dispersant B is zinc stearate.
The preparation method of the silicone adhesive with the mildew-proof effect comprises the following steps: the same as in example 1.
Comparative example 5 differs from example 2 in that: the preparation raw materials of the dispersing agent A are different; the dispersant A described in example 2 was prepared from polyvinyl alcohol, benzoyl chloride and dodecenyl succinic anhydride; the dispersant A described in comparative example 5 was prepared from polyvinyl alcohol and dodecenylsuccinic anhydride.
Experimental example 1
The silicone adhesives having antifungal effects prepared in examples 1 and 2 were prepared into specimens according to the method specified in annex B of QB/T2591-2003 and subjected to a mildew-growth rating test; the test results are shown in Table 1.
TABLE 1 mildew-resistant Silicone adhesive rating test results
| Test sample | Grade of mold growth |
| Example 1 the resulting silicone adhesive having antifungal activity | Level 0 |
| Example 2 the silicone adhesive having antifungal Effect | Level 0 |
As can be seen from the results of the mildew-proof rating test in table 1, the silicone adhesives with mildew-proof effect prepared in examples 1 and 2 have a mildew-proof rating of 0, which indicates that the silicone adhesives with mildew-proof effect prepared in the present invention have excellent mildew-proof effect.
Experimental example 2
The silicone adhesive with the mildew-proof effect prepared in the examples 1 and 2 and the comparative examples 1 to 5 is prepared into a sample strip according to the method specified in QB/T2591-2003 appendix A, and is subjected to an antibacterial performance test; the test strains are staphylococcus aureus, escherichia coli and methicillin-resistant staphylococcus aureus (MRSA); the test results are shown in Table 2.
TABLE 2 results of the tests of the antibacterial properties of the silicone adhesive with mildewproof effect
As can be seen from the results of antibacterial performance tests in Table 2, the silicone adhesive with the mildew-proof effect has the antibacterial rate of over 90 percent on staphylococcus aureus and Escherichia coli, and has excellent antibacterial effect on conventional bacteria; particularly has excellent antibacterial effect on the antibacterial rate of methicillin-resistant staphylococcus aureus.
As can be seen from the results of the antibacterial property test in Table 2, the antibacterial rate of the silicone adhesive with mildewproof effect prepared in example 2 is better than that of example 1 and comparative example 1; particularly, the antibacterial rate to methicillin-resistant staphylococcus aureus is far higher than that of the example 1; this indicates that: the dispersing agent plays an important role in whether the composite mildew preventive consisting of the nano zinc oxide and the camphor wood powder extract can play the greatest role in resisting methicillin-resistant staphylococcus aureus (MRSA) in the silicone adhesive. Under the condition of a certain dosage of the composite mildew inhibitor, the composite mildew inhibitor is a composite dispersant consisting of a dispersant A and a dispersant B zinc stearate, wherein the dispersant A is prepared from polyvinyl alcohol, benzoyl chloride and dodecenyl succinic anhydride, and compared with a conventional dispersant, the composite mildew inhibitor can further greatly improve the methicillin-resistant staphylococcus aureus (MRSA) resistance of the silicone adhesive.
As can be seen from the results of the antibacterial property test in Table 2, the antibacterial rate of the silicone adhesive with mildewproof effect prepared in example 2 is better than that of comparative examples 2 and 3; particularly, the antibacterial rate to methicillin-resistant staphylococcus aureus is far higher than that of the example 1; this indicates that: the preparation method of the camphor wood powder extract has a decisive role in determining whether the composite mildew preventive has excellent methicillin-resistant staphylococcus aureus resistance when added into silicone adhesive; the antibacterial effect of the camphor wood powder extract obtained by extracting camphor wood powder with a solvent consisting of chloroform, methanol and ethyl acetate on methicillin-resistant staphylococcus aureus (MRSA) after being combined with nano zinc oxide is far higher than that of the camphor wood powder extract obtained by extracting camphor wood powder with a single solvent such as conventional ethanol or other mixed solvents such as chloroform, methanol and the like and nano zinc oxide after being combined. The composite mildew inhibitor obtained by extracting the camphor wood powder with a solvent consisting of chloroform, methanol and ethyl acetate and a nano zinc oxide composition is added into the silicone adhesive, and has excellent antibacterial effect on methicillin-resistant staphylococcus aureus (MRSA).
As can be seen from the results of the antibacterial performance test in Table 2, the antibacterial rate of the silicone adhesive with the mildewproof effect prepared in the proportions 4 and 5 to methicillin-resistant Staphylococcus aureus is equivalent to that of the silicone adhesive prepared in the example 1 and is greatly smaller than that of the silicone adhesive prepared in the example 2; this indicates that: the preparation method of the dispersing agent A plays an important role in the fact that whether the composite mildew preventive consisting of the nano zinc oxide and the camphor wood powder extract can play the greatest role in resisting methicillin-resistant staphylococcus aureus (MRSA) in the silicone adhesive; under the condition of a certain dosage of the composite mildew preventive, the effect of the silicone adhesive on resisting methicillin-resistant staphylococcus aureus (MRSA) can be further greatly improved only by adopting a composite dispersant consisting of a dispersant A and a dispersant B zinc stearate, wherein the dispersant A is prepared from polyvinyl alcohol, benzoyl chloride and dodecenyl succinic anhydride; however, the effect of methicillin-resistant staphylococcus aureus (MRSA) resistance of the silicone adhesive cannot be further improved to a large extent only by using a composite dispersant composed of polyvinyl alcohol and benzoyl chloride, or a dispersant a and a dispersant B zinc stearate prepared from polyvinyl alcohol and dodecenylsuccinic anhydride.
Claims (10)
1. A silicone adhesive with mildew-proof function is prepared by taking polydimethylsiloxane as a raw material, and is characterized in that a compound mildew-proof agent is added in the process of preparing the silicone adhesive with mildew-proof function;
the composite mildew preventive comprises nano zinc oxide and camphor wood powder extract; wherein the weight ratio of the nano zinc oxide to the camphor wood powder extract is 5-10: 1.
2. The silicone adhesive with a mold-proof effect according to claim 1, wherein the weight ratio of the nano zinc oxide to the camphor wood powder extract is 9: 1.
3. The silicone adhesive with the mildew-proof effect according to claim 1, wherein the weight amount of the mildew-proof agent is 0.1-5% of the total weight of the silicone adhesive raw material with the mildew-proof effect;
preferably, the dosage of the mildew preventive accounts for 0.5-3% of the total weight of the raw materials of the silicone adhesive with the mildew preventive effect;
most preferably, the mildew inhibitor is used in an amount of 1% of the total weight of the raw materials of the silicone adhesive with mildew-proof effect.
4. The silicone adhesive with mildew-proof effect of claim 1, wherein the camphor wood powder extract is prepared by the following method: taking camphor wood powder, adding an organic solvent, heating, refluxing and extracting for 1-2 hours, concentrating an extracting solution, and drying to obtain the camphor wood powder extract;
the organic solvent consists of chloroform, methanol and ethyl acetate.
5. The silicone adhesive with mildew-proof effect of claim 4, wherein the volume ratio of chloroform to methanol to ethyl acetate is 5-10: 2-4: 1-2.
6. The silicone adhesive with mildewproof effect according to claim 4, wherein the volume ratio of the chloroform to the methanol to the ethyl acetate is 6:3: 1.
7. The silicone adhesive having a mold-proof effect according to claim 1, further comprising a dispersant; the weight of the dispersant accounts for 1-3% of the total weight of the raw materials of the silicone adhesive with the mildew-proof function.
8. The silicone adhesive with mildew-proof effect as claimed in claim 1, wherein the dispersant is a composite dispersant; the composite dispersant comprises a dispersant A and a dispersant B;
the dispersant A is prepared by a method comprising the following steps: dissolving 10-15 parts by weight of polyvinyl alcohol in 200-300 parts by weight of DMSO solvent, adding 10-20 parts by weight of benzoyl chloride and 20-30 parts by weight of dodecenyl succinic anhydride, uniformly stirring, and reacting at 80-100 ℃ for 3-6 h; after the reaction is finished, concentrating to remove the solvent, and drying the solid to obtain the dispersant A.
9. The silicone adhesive with mildewproof effect of claim 8, wherein the dispersant is a composite dispersant; the composite dispersant comprises a dispersant A and a dispersant B;
the dispersant A is prepared by a method comprising the following steps: dissolving 12 parts by weight of polyvinyl alcohol in 240 parts by weight of DMSO solvent, adding 14 parts by weight of benzoyl chloride and 26 parts by weight of dodecenyl succinic anhydride, uniformly stirring, and reacting at 90 ℃ for 5 hours; after the reaction is finished, concentrating to remove the solvent, and drying the solid to obtain the dispersant A.
10. The silicone adhesive with mildewproof effect according to claim 8, wherein the dispersant B is zinc stearate.
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