Optical curtain with mildew-proof effect and manufacturing process thereof

Abstract

The invention relates to the technical field of optical curtains, and discloses an optical curtain with anti-mildew effect and a manufacturing process thereof. The optical curtain consists of an optical curtain substrate and an antibacterial and anti-mildew coating sprayed on the surface of the optical curtain substrate. The antibacterial and anti-mildew coating is formed by curing an antibacterial and anti-mildew water-based paint. The antibacterial and anti-mildew water-based paint comprises the following raw materials: epoxy resin, composite antibacterial component, functional filler, curing agent, curing accelerator, diluent, leveling agent, defoaming agent, and deionized water. The composite antibacterial component can give the paint antibacterial and anti-mildew properties, and can generate chemical bonding between the paint and the optical curtain substrate, effectively enhancing the adhesion of the coating. The functional filler can cooperate with the composite antibacterial component to achieve antibacterial and anti-mildew, and at the same time has strong diffuse reflection performance, improves the projection effect of the optical curtain, and enhances the flexibility of the coating to avoid cracking or peeling of the coating.

Description

Technical Field

[0001] The invention relates to the technical field of optical curtains, and in particular to an optical curtain with anti-mildew effect and a manufacturing process thereof. Background Art

[0002] With the continuous development of science and technology and the continuous improvement of living standards, projection technology has been widely used in the fields of education, business, medical care, and architectural design. Optical screens are an important part of projection technology. Optical screens are the carriers of images and screens. They are of great significance for improving the clarity of the picture and enhancing the visibility of the picture. Optical screens mainly include reflective optical screens and transmissive optical screens. Reflective optical screens are mainly used for forward projection. The projection light is directly reflected on the screen and then reflected by the screen to the audience's line of sight; transmissive optical screens are mainly used for rear projection. The projection light is emitted from the back of the screen and then reflected by the screen to the audience's line of sight. Reflective optical screens are more widely used because of their relatively lower production costs. Reflective optical screens include diffuse reflection screens and directional reflection screens. Among them, directional reflection screens mainly include metal screens and anti-light screens. Although they have better anti-light effects and viewing experience, they are relatively expensive. In addition, diffuse reflection optical screens have relatively low requirements for projectors and are more adaptable, which are favored by consumers.

[0003] However, during use, the surface of the diffuse reflection optical curtain is prone to dust accumulation, and after being touched by fingers, it is contaminated with fingerprints and bacteria, etc., providing a habitat for bacterial reproduction, causing bacterial growth and mildew, resulting in stains on the surface of the diffuse reflection optical curtain, which not only affects the clarity of the projected image and reduces the viewing experience, but also frequently cleans the curtain and easily shortens its service life, and has adverse effects on the health of the user. Therefore, an antibacterial and mildew-proof coating with excellent adhesion can be applied to the surface of the diffuse reflection optical curtain. At the same time, in order not to affect the diffuse reflection effect of the diffuse reflection optical curtain, functional fillers are added to the antibacterial and mildew-proof coating to make the projection effect of the diffuse reflection optical curtain better. Therefore, the present invention provides an optical curtain with mildew-proof effect, and the antibacterial and mildew-proof coating is applied to its surface and cured to form an antibacterial and mildew-proof coating. The coating not only has excellent antibacterial and mildew-proof properties, good adhesion, and strong flexibility, but also has excellent diffuse reflection properties, can enhance the visual effect of the image, and improve the viewing experience of the user, and has broad application prospects. Summary of the invention

[0004] In order to solve the problems mentioned in the background technology, the object of the present invention is to provide an optical curtain with anti-mildew effect and a manufacturing process thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An optical curtain with anti-mildew effect, comprising an optical curtain substrate and an antibacterial and anti-mildew coating sprayed on the surface of the optical curtain substrate; the antibacterial and anti-mildew coating is formed by curing an antibacterial and anti-mildew water-based coating; the antibacterial and anti-mildew water-based coating comprises the following raw materials in parts by weight: 50-70 parts of epoxy resin, 3-5 parts of composite antibacterial components, 3-6 parts of functional fillers, 25-35 parts of curing agent, 0.2-0.5 parts of curing accelerator, 3-8 parts of diluent, 1-3 parts of leveling agent, 1-2 parts of defoaming agent, and 60-90 parts of deionized water.

[0007] Furthermore, the preparation method of the antibacterial and mildew-proof water-based coating comprises the following steps:

[0008] Step 1: adding epoxy resin, composite antibacterial component and functional filler into deionized water, and then adding curing agent, diluent, leveling agent and defoaming agent, stirring evenly at 40-60° C. to obtain a mixture;

[0009] Step 2: Add the curing accelerator to the mixture and stir for 0.5-1h to obtain the antibacterial and mildew-proof water-based coating.

[0010] Furthermore, the preparation method of the composite antibacterial component is as follows:

[0011] Add polyether-terminated epoxy silicone oil to dimethyl sulfoxide, stir for 10-15 minutes, then add cinnamic acid and catalyst A, raise the temperature to 50-70°C, react for 3-5 hours, cool to room temperature, discharge, and obtain a composite antibacterial component.

[0012] By adopting the above technical scheme, the terminal epoxy group in the polyether-terminated epoxy silicone oil structure can undergo a ring-opening reaction with the carboxyl group in the cinnamic acid structure, thereby introducing cinnamic acid with natural antibacterial effect into the polyether-terminated epoxy silicone oil to obtain a composite antibacterial component. The composite antibacterial component contains antibacterial small molecule cinnamic acid, which is grafted with polyether-terminated epoxy silicone oil to effectively improve the precipitation problem of small molecule antibacterial substance cinnamic acid, and can ensure that the antibacterial substance acts in the coating for a long time, thereby giving the optical screen antibacterial and mildew-proof properties, avoiding affecting the projection effect of the optical screen and affecting the health of users. The polyether-terminated epoxy silicone oil contains ether bonds and silicon-oxygen bonds, which, on the one hand, allow the coating to produce chemical bonding with the optical screen substrate, enhance the adhesion between the coating and the optical screen, and reduce the probability of coating shedding. On the other hand, the low surface energy silicone oil can reduce the adhesion of bacteria and mold. In addition, the composite antibacterial component contains hydroxyl groups produced by the ring-opening reaction, which can be cross-linked with the epoxy resin matrix, and the molecular chains are entangled with each other, thereby improving the density of the epoxy resin structure, further improving the antibacterial and mildew-proof properties of the coating and the adhesion to the optical screen substrate, extending the service life of the coating, and thereby extending the service life of the optical screen.

[0013] Furthermore, the relative molecular mass of the polyether-terminated epoxy silicone oil is 8000-13000.

[0014] Furthermore, the catalyst A is tetrabutylammonium bromide or tetrabutylammonium chloride.

[0015] Furthermore, the method for preparing the functional filler comprises the following steps:

[0016] S1. Dispersing nano zinc oxide in toluene to form a uniform dispersion, adding methacryloyl chloride and catalyst B to the dispersion, stirring at room temperature for 4-6 hours, filtering, washing, and vacuum drying to obtain modified nano zinc oxide;

[0017] S2. Disperse the modified nano zinc oxide in xylene, add polysulfide rubber and photoinitiator, stir for 10-20 minutes, irradiate under ultraviolet light with a light intensity of 20-30mW / cm2 for reaction for 3-5 hours, centrifuge, wash, and vacuum dry to obtain a functional filler.

[0018] By adopting the above technical scheme, under the action of a catalyst, the active hydroxyl groups on the surface of nano zinc oxide can undergo an esterification reaction with the acyl chloride in the methacryloyl chloride structure, thereby introducing olefin groups on the surface of the nano zinc oxide to obtain modified nano zinc oxide. Under the action of a photoinitiator, the olefin groups on the surface of the modified nano zinc oxide can undergo a thiol-olefin click reaction with the thiol groups in the polysulfide rubber structure to obtain a functional filler. The functional filler is obtained by grafting nano zinc oxide with polysulfide rubber, which effectively improves the compatibility between nano zinc oxide and epoxy resin matrix. Polysulfide rubber forms a bridge between nano zinc oxide and epoxy resin, avoiding the agglomeration of nano zinc oxide in the epoxy resin matrix, enabling it to be evenly dispersed in the matrix, enhancing the binding force between nano zinc oxide and epoxy resin matrix, and giving full play to the advantages of nano zinc oxide. On the one hand, under light conditions, nano zinc oxide reacts with water or hydroxide ions to produce hydroxyl groups with strong oxidizing properties, thereby killing bacteria and forming a synergistic antibacterial effect with the composite antibacterial component. On the other hand, nano zinc oxide has a nanoscale surface structure and strong diffuse reflection efficiency, which can improve the diffuse reflectivity, thereby improving the projection effect of the optical curtain and the viewing experience of the user. In addition, polysulfide rubber has good flexibility. Adding it to the epoxy resin matrix can increase the flexible chain structure of the epoxy resin matrix, thereby enhancing the flexibility of the epoxy resin matrix, so that the coating has stronger resistance when subjected to external forces, avoiding cracking or peeling of the coating, and better protecting the optical curtain substrate.

[0019] Furthermore, in S1, the catalyst B is triethylamine or pyridine.

[0020] Furthermore, in S2, the photoinitiator is benzoin dimethyl ether or benzoin isopropyl ether.

[0021] Furthermore, the curing agent is methyltetrahydrophthalic anhydride or methylhexahydrophthalic anhydride; the curing accelerator is 2-methylimidazole or 2-ethylimidazole; the diluent is alkylene glycidyl ether or o-cresyl glycidyl ether; the leveling agent is BYK-111 or BYK-346; and the defoaming agent is BYK-071 or BYK-052.

[0022] A manufacturing process of an optical curtain with anti-mildew effect comprises the following steps:

[0023] Ⅰ. Spray the antibacterial and anti-mildew coating evenly on the surface of the optical curtain substrate. After spraying, let it stand for 15-30 minutes;

[0024] Ⅱ. Place the optical curtain cloth substrate that has been left to stand in Ⅰ in a vacuum drying oven at 60-70°C, and after curing for 20-40 minutes, form an antibacterial and mildew-proof coating of 25-35 μm, and obtain an optical curtain cloth with mildew-proof effect.

[0025] Beneficial effects of the present invention:

[0026] The antibacterial and mildew-proof water-based coating prepared by the present invention is added with a composite antibacterial component and a functional filler. The antibacterial and mildew-proof coating formed after curing has an antibacterial rate of up to 99.9%, which reduces the influence of bacteria and mildew on the projection effect of the optical screen and the influence on the health of the user. The adhesion level can reach level 0, the coating has strong adhesion, the coating is not easy to fall off, and can pass the 1mm diameter shaft rod bending test without being damaged. It has strong flexibility, the coating is not easy to crack or peel off, and the diffuse reflectivity can reach 96.2%, which can improve the viewing experience of the user and has broad application prospects.

[0027] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 It is the infrared spectrum of the composite antibacterial component in the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The preparation methods of the composite antibacterial components and functional fillers used in the following examples and comparative examples of the present invention are as follows:

[0032] 1. Composite antibacterial components

[0033] 3.2 g of polyether-terminated epoxy silicone oil with a relative molecular mass of 8000 was added to dimethyl sulfoxide, and after stirring for 15 minutes, 2.6 g of cinnamic acid and 0.05 g of tetrabutylammonium bromide were added, and the temperature was raised to 60°C, reacted for 5 hours, cooled to room temperature, and discharged to obtain a composite antibacterial component.

[0034] Using the potassium bromide tableting method, a small amount of the composite antibacterial component was mixed with potassium bromide and ground into thin slices. The composite antibacterial component was tested by infrared using a FT-IR Fourier transform infrared spectrometer, such as Figure 1 As shown, analysis shows that in the infrared spectrum of the composite antibacterial component, the absorption peak of hydroxyl group appears at 3440cm-1, the absorption peak of carbon-hydrogen bond in carbon-carbon double bond appears at 3057cm-1, the absorption peak of carbon-hydrogen bond in benzene ring appears at 3022cm-1, the absorption peak of carbon-oxygen double bond in ester group appears at 1732cm-1, the absorption peak of ether bond appears at 1121cm-1, and the absorption peaks of silicon-oxygen bond appear at 1054cm-1 and 1020cm-1.

[0035] 2. Functional fillers

[0036] S1. Disperse 3 g of nano zinc oxide in toluene to form a uniform dispersion, add 2.2 g of methacryloyl chloride and triethylamine to the dispersion, stir at room temperature for 5 h, filter, wash, and vacuum dry to obtain modified nano zinc oxide;

[0037] S2. Disperse 2.8g of modified nano zinc oxide in xylene, add 3g of polysulfide rubber and 0.2g of benzoin dimethyl ether, stir for 15min, irradiate under ultraviolet light with a light intensity of 20mW / cm2 for 5h, centrifuge, wash, and vacuum dry to obtain a functional filler.

[0038] The functional filler was analyzed by PE2400 (Ⅱ) element analyzer. The test results showed that the sulfur content in the functional filler was 12.67%. Since nano zinc oxide does not contain sulfur, the sulfur in the functional filler is provided by the reaction between modified nano zinc oxide and polysulfide rubber. Example 1

[0039] Preparation of antibacterial and anti-mildew water-based coating

[0040] Step 1, add 50g of epoxy resin, 3g of composite antibacterial component and 3g of functional filler into 60g of deionized water, then add 25g of methyltetrahydrophthalic anhydride, 3g of alkylene glycidyl ether, 1g of leveling agent BYK-346, 1g of defoaming agent BYK-071, stir evenly at 40°C to obtain a mixture;

[0041] Step 2: Add 0.2 g of 2-ethylimidazole to the mixture and stir for 0.5 h to obtain an antibacterial and anti-mildew water-based coating. Example 2

[0042] Preparation of antibacterial and anti-mildew water-based coating

[0043] Step 1: add 60g of epoxy resin, 4g of composite antibacterial component and 5g of functional filler into 75g of deionized water, then add 30g of methyltetrahydrophthalic anhydride, 6g of alkylene glycidyl ether, 2g of leveling agent BYK-346 and 1.5g of defoaming agent BYK-071, stir evenly at 50°C to obtain a mixture;

[0044] Step 2: Add 0.35 g of 2-ethylimidazole to the mixture and stir for 0.75 h to obtain an antibacterial and anti-mildew water-based coating. Example 3

[0045] Preparation of antibacterial and anti-mildew water-based coating

[0046] Step 1, add 70g of epoxy resin, 5g of composite antibacterial component and 6g of functional filler into 90g of deionized water, then add 35g of methyltetrahydrophthalic anhydride, 8g of alkylene glycidyl ether, 3g of leveling agent BYK-346, 2g of defoaming agent BYK-071, stir evenly at 60°C to obtain a mixture;

[0047] Step 2: Add 0.5 g of 2-ethylimidazole to the mixture and stir for 1 hour to obtain an antibacterial and anti-mildew water-based coating.

[0048] Comparative Example 1

[0049] Preparation of water-based coatings

[0050] Step 1: add 60g of epoxy resin and 4g of composite antibacterial component into 75g of deionized water, then add 30g of methyltetrahydrophthalic anhydride, 6g of alkylene glycidyl ether, 2g of leveling agent BYK-346 and 1.5g of defoaming agent BYK-071, stir evenly at 50°C to obtain a mixture;

[0051] Step 2: Add 0.35 g of 2-ethylimidazole to the mixture and stir for 0.75 h to obtain a water-based coating.

[0052] Comparative Example 2

[0053] Preparation of water-based coatings

[0054] Step 1: add 60g of epoxy resin and 5g of functional filler into 75g of deionized water, then add 30g of methyltetrahydrophthalic anhydride, 6g of alkylene glycidyl ether, 2g of leveling agent BYK-346 and 1.5g of defoaming agent BYK-071, stir evenly at 50°C to obtain a mixture;

[0055] Step 2: Add 0.35 g of 2-ethylimidazole to the mixture and stir for 0.75 h to obtain a water-based coating.

[0056] Comparative Example 3

[0057] Preparation of water-based coatings

[0058] Step 1: add 60g of epoxy resin, 4g of cinnamic acid and 5g of functional filler into 75g of deionized water, then add 30g of methyltetrahydrophthalic anhydride, 6g of alkylene glycidyl ether, 2g of leveling agent BYK-346 and 1.5g of defoaming agent BYK-071, stir evenly at 50°C to obtain a mixture;

[0059] Step 2: Add 0.35 g of 2-ethylimidazole to the mixture and stir for 0.75 h to obtain a water-based coating.

[0060] Comparative Example 4

[0061] Preparation of water-based coatings

[0062] Step 1: add 60g of epoxy resin, 4g of composite antibacterial component and 5g of nano zinc oxide into 75g of deionized water, then add 30g of methyltetrahydrophthalic anhydride, 6g of alkylene glycidyl ether, 2g of leveling agent BYK-346 and 1.5g of defoaming agent BYK-071, stir evenly at 50°C to obtain a mixture;

[0063] Step 2: Add 0.35 g of 2-ethylimidazole to the mixture and stir for 0.75 h to obtain a water-based coating.

[0064] Performance Testing

[0065] The antibacterial and mildew-proof water-based coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were sprayed on the surface of tinplate, placed in a vacuum drying oven at 60°C, and cured for 30 minutes to form a 30 μm antibacterial and mildew-proof coating. The performance of the antibacterial and mildew-proof coating was tested:

[0066] According to GB / T 21866-2008 standard, the coating was left to stand for 20 days and then its antibacterial rate was tested. According to GB / T 9286-2021 standard, its adhesion was tested. According to GB / T 1731-2020 standard, its flexibility was tested. The diffuse reflectance of the coating was tested using a UV-visible spectrophotometer. The test results are shown in the following table:

[0067]

[0068] It can be seen from the above table that the coatings formed by the antibacterial and mildew-proof water-based coatings prepared in Examples 1 to 3 of the present invention after drying have excellent antibacterial and mildew-proof properties, good adhesion, strong flexibility, and high diffuse reflectivity. In Comparative Example 1, no functional filler was added, and the functional filler could not be used to achieve the effects of synergistic antibacterial and mildew prevention, improved flexibility, and improved diffuse reflectance, so the antibacterial rate, flexibility, and diffuse reflectance test results were poor; in Comparative Example 2, no composite antibacterial component was added, and the polyether-terminated epoxy silicone oil grafted cinnamic acid could not be used to improve the antibacterial and mildew prevention properties and adhesion, so the antibacterial rate and adhesion test results were poor; in Comparative Example 3, cinnamic acid was added, which is a small molecule antibacterial and mildew prevention substance, which is easy to precipitate, and the polyether-terminated epoxy silicone oil could not be used to improve the adhesion, so the antibacterial rate and adhesion test results were poor; in Comparative Example 4, nano zinc oxide was added, and it was directly added without being modified by polysulfide rubber, which easily produced agglomeration in the coating, affecting the antibacterial effect and diffuse reflectance, and the polysulfide rubber could not be used to improve the flexibility of the coating, so the antibacterial rate, flexibility, and diffuse reflectance test results were poor.

[0069] The antibacterial and mildew-proof water-based coating prepared in Examples 1 to 3 is used to manufacture an optical curtain with mildew-proof effect, comprising the following steps:

[0070] Ⅰ. Spray the antibacterial and anti-mildew coating evenly on the surface of the optical curtain substrate. After spraying, let it stand for 20 minutes;

[0071] Ⅱ. Place the optical curtain cloth substrate that has been left to stand in Ⅰ in a vacuum drying oven at 65°C and cure for 30 minutes to form a 30 μm antibacterial and mildew-proof coating, thereby obtaining an optical curtain cloth with mildew-proof effect.

[0072] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. An optical curtain with anti-mildew effect, characterized in that: It comprises an optical curtain substrate and an antibacterial and mildew-proof coating sprayed on the surface of the optical curtain substrate; the antibacterial and mildew-proof coating is formed by curing the antibacterial and mildew-proof water-based coating; the antibacterial and mildew-proof water-based coating comprises the following raw materials in parts by weight: 50-70 parts of epoxy resin, 3-5 parts of composite antibacterial components, 3-6 parts of functional fillers, 25-35 parts of curing agent, 0.2-0.5 parts of curing accelerator, 3-8 parts of diluent, 1-3 parts of leveling agent, 1-2 parts of defoaming agent, and 60-90 parts of deionized water; The preparation method of the composite antibacterial component is as follows: Add polyether-terminated epoxy silicone oil to dimethyl sulfoxide, stir for 10-15 minutes, then add cinnamic acid and catalyst A, raise the temperature to 50-70°C, react for 3-5 hours, cool to room temperature, and discharge to obtain a composite antibacterial component; The preparation method of the functional filler comprises the following steps: S1. Dispersing nano zinc oxide in toluene to form a uniform dispersion, adding methacryloyl chloride and catalyst B to the dispersion, stirring at room temperature for 4-6 hours, filtering, washing, and vacuum drying to obtain modified nano zinc oxide; S2. Disperse the modified nano zinc oxide in xylene, add polysulfide rubber and photoinitiator, stir for 10-20 minutes, and then 2 After irradiation under ultraviolet light for 3-5 hours, centrifugation, washing, and vacuum drying are performed to obtain a functional filler; The catalyst A is tetrabutylammonium bromide or tetrabutylammonium chloride; In S1, the catalyst B is triethylamine or pyridine.

2. The optical curtain with anti-mildew effect according to claim 1, characterized in that: The preparation method of the antibacterial and mildew-proof water-based coating comprises the following steps: Step 1: adding epoxy resin, composite antibacterial component and functional filler into deionized water, and then adding curing agent, diluent, leveling agent and defoaming agent, stirring evenly at 40-60° C. to obtain a mixture; Step 2: Add the curing accelerator to the mixture and stir for 0.5-1h to obtain the antibacterial and mildew-proof water-based coating.

3. The optical curtain with anti-mildew effect according to claim 1, characterized in that: The relative molecular weight of the polyether-terminated epoxy silicone oil is 8000-13000.

4. The optical curtain with anti-mildew effect according to claim 1, characterized in that: In S2, the photoinitiator is benzoin dimethyl ether or benzoin isopropyl ether.

5. The optical curtain with anti-mildew effect according to claim 1, characterized in that: The curing agent is methyltetrahydrophthalic anhydride or methylhexahydrophthalic anhydride; the curing accelerator is 2-methylimidazole or 2-ethylimidazole; the diluent is alkylene glycidyl ether or o-cresyl glycidyl ether; the leveling agent is BYK-111 or BYK-346; and the defoaming agent is BYK-071 or BYK-052.

6. A process for manufacturing an optical curtain with anti-mildew effect as claimed in claim 1, characterized in that: The following steps are involved: Ⅰ. Spray the antibacterial and anti-mildew coating evenly on the surface of the optical curtain substrate. After spraying, let it stand for 15-30 minutes; Ⅱ. Place the optical curtain cloth substrate that has been left to stand in Ⅰ in a vacuum drying oven at 60-70°C, and after curing for 20-40 minutes, form an antibacterial and mildew-proof coating of 25-35 μm, and obtain an optical curtain cloth with mildew-proof effect.

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