Packaging adhesive film as well as preparation method and application thereof

Abstract

The invention provides a packaging adhesive film as well as a preparation method and application thereof. The packaging adhesive film comprises a resin matrix and polymer particles dispersed in the resin matrix, on the basis of 100 parts by weight of the resin matrix, 10-100 parts by weight of polymer particles are dispersed in the resin matrix; the glass transition temperature of the resin matrix is-20 to 5 DEG C, and the temperature interval of the loss factor tan delta of the resin matrix is 15 to 20 DEG C, wherein the loss factor tan delta of the resin matrix is greater than 0.2; the glass transition temperature of the polymer particles is 19-26 DEG C, and the temperature range of the loss factor tan delta of the polymer particles is 30-40 DEG C when the loss factor tan delta is greater than 0.2. The temperature interval of the loss factor of the two materials in the components of the packaging adhesive film is larger than 60 DEG C when the loss factor is larger than 0.2, the damping performance is excellent, meanwhile, the polymer particles and the resin matrix are in a semi-compatible transition state and have high interface acting force, sound transmission vibration can dissipate part of energy, and the sound transmission effect is good. The packaging adhesive film provided by the invention has excellent sound insulation effect and also has good light transmittance and relatively low haze.

Description

Technical Field

[0001] The present invention relates to the technical field of laminated glass, and in particular to a packaging adhesive film and a preparation method and application thereof. Background Art

[0002] At present, the main laminated glass for sound insulation on the market is PVB (polyvinyl butyral resin) film, because the glass transition temperature of PVB is close to room temperature, it has strong damping effect and excellent sound insulation performance. Excellent sound insulation PVB film is usually a three-layer structure, the upper and lower layers are high molecular weight, low plasticizer content PVB, and the middle layer is low molecular weight, high plasticizer content PVB. However, PVB is relatively expensive and has a low cost performance.

[0003] The glass transition temperature of EVA (ethylene-vinyl acetate copolymer) film is around -20℃. At room temperature, its damping performance is poor. In order to improve the sound insulation effect, some nanoparticles with porous or hollow structures are usually added to the film. The viscous force or internal friction generated by the interaction between air molecules in the structure is used to convert sound energy into heat energy and lose it. However, most nanoparticles are inorganic materials, which will affect the light transmittance and haze of the film. EVA film with sound insulation performance can be used for bonding structural parts, but is not suitable for transparent laminated glass packaging.

[0004] Japanese patent document with application number JP2007253469A discloses a laminate of PVB and EVA, where PVB has high tanδ (high vibration absorption) at room temperature, and EVA has high tanδ (high vibration absorption) at low temperature, and the combination of layer thicknesses that synergistically exert the characteristics of each layer further improves the above-mentioned penetration resistance and impact resistance. However, the processing technology of the composite film is complicated, and due to the large difference in fluidity between the two films, it is easy to shrink unevenly, and the thickness uniformity of the adhesive layer at the edge is poor, which easily forms a water vapor path, leading to the problem of debonding and re-bubbling.

[0005] Chinese patent literature discloses "a gradient laminated glass and its preparation process", and its publication number is CN109648954A. The hollow glass beads, modified diatomaceous earth and bentonite used in the patent are all inorganic particles, and the added amount is large. The light transmittance of the finished product is low, the haze is high, and the performance as a laminated glass is low. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a packaging film and a preparation method and use thereof, so as to solve the problem that the existing packaging film cannot take into account sound insulation, light transmittance and haze.

[0007] To achieve the above-mentioned purpose and other related purposes, the present invention provides a packaging film, comprising a resin matrix and polymer particles dispersed in the resin matrix; based on 100 parts by weight of the resin matrix, 10 to 100 parts of the polymer particles are dispersed in the resin matrix; the glass transition temperature of the resin matrix is ​​-20 to 5°C, and the temperature range in which the loss factor tanδ of the resin matrix is ​​greater than 0.2 is 15 to 20°C; the glass transition temperature of the polymer particles is 19 to 26°C, and the temperature range in which the loss factor tanδ of the polymer particles is greater than 0.2 is 30 to 40°C.

[0008] The packaging film of the present application includes a resin matrix and polymer particles dispersed in the resin matrix. The temperature range in which the loss factor of the two materials in the components is greater than 0.2 is greater than 60°C, and the damping performance is excellent. At the same time, the polymer particles and the resin matrix are in a semi-compatible transition state and have a strong interfacial force. The sound propagation vibration will dissipate part of the energy. The packaging film of the present application has good sound insulation and damping effect and has excellent sound insulation effect.

[0009] Preferably, based on 100 parts by weight of the resin matrix, 10 to 25 parts of the polymer particles are dispersed in the resin matrix.

[0010] Preferably, the polymer particles have a transmittance of 92-94% in the visible light band of 400-760 nm, a haze of 0.05-0.1%, and a refractive index of 1.49-1.53; Preferably, the resin matrix has a transmittance of 90-91% in the visible light band of 400-760 nm, a haze of 0.35-0.6%, and a refractive index of 1.49-1.54.

[0011] Preferably, the resin matrix is ​​selected from one or both of EVA and POE (polyolefin elastomer); Preferably, the melt index of the resin matrix is ​​7-10 g / 10 min (190° C. / 2.16 kg). Too low a melt index will affect the dispersion of polymer particles and is not conducive to processing and molding.

[0012] Preferably, the polymer particles are selected from one or more of PVB particles, PMMA (polymethyl methacrylate) particles, transparent PVC (polyvinyl chloride) particles, silicone rubber particles, and FEP (fluorinated ethylene propylene) particles, and the particle size of the polymer particles is 0.1-0.5 μm.

[0013] Preferably, the polymer particles comprise PVB resin powder; The resin matrix is ​​EVA resin; the VA content in the EVA resin is 28-33%; Preferably, the PVB resin powder has a hydroxyl value of 15-17%, an acetal value of 79-83%, and an acetyl content of 5-7%.

[0014] The present application controls the hydroxyl value content and acetal value content of the PVB resin powder within a reasonable range to improve the compatibility of the PVB particles with the EVA resin matrix and the plasticizer, while reducing the water absorption rate of the PVB particles and the possibility of reducing the performance of the material due to electrostatic adsorption and agglomeration caused by particle friction during the mixing process.

[0015] Preferably, the particle size of the PVB resin powder is 0.1-0.2 μm.

[0016] Preferably, the polymer particles further contain a plasticizer. Based on the total mass of the polymer particles, the amount of the PVB resin powder added is 64-74%, and the amount of the plasticizer added is 26-36%. The content of the plasticizer in the polymer particles determines the glass transition temperature and damping performance of the polymer particles. After the PVB resin powder is mixed with the plasticizer, the storage conditions should be low temperature and low humidity to avoid mutual adhesion between the prepared PVB particles and control the moisture content of the PVB particles. Too high a moisture content will affect the refractive index of the interface between the PVB particles and the EVA resin matrix and increase the haze of the encapsulation film material.

[0017] More preferably, the polymer particles further contain a plasticizer, and based on the total mass of the polymer particles, the added amount of the PVB resin powder is 64-70%, and the added amount of the plasticizer is 30-36%. More preferably, the plasticizer is triethylene glycol diisooctanoate (3G8), which has good compatibility and migration resistance.

[0018] Preferably, the polymer particles further include a first anti-ultraviolet agent, and the added amount of the first anti-ultraviolet agent is 0.1-0.25% of the total mass of the PVB resin powder and the plasticizer.

[0019] More preferably, the first anti-ultraviolet agent is selected from one or both of UV329 (2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole) and UV326 (2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole).

[0020] Preferably, the packaging adhesive film further comprises an auxiliary agent, and the auxiliary agent is selected from one or more of a cross-linking agent, a co-cross-linking agent, a silane coupling agent and a second anti-ultraviolet agent.

[0021] Preferably, the crosslinking agent is selected from one or more of peroxide, tert-butyl peroxycarbonate-2-ethylhexyl ester, and 2,5-di-tert-butyl peroxy-2,5-dimethylhexane.

[0022] More preferably, the crosslinking temperature of the peroxide is 140° C. and the half-life is long. Because the polymer particles are not completely plasticized inside the encapsulation film, they need to be completely plasticized during the lamination process of the encapsulation laminated glass to promote the interface fusion between the polymer particles and the resin matrix and avoid the loss of optical properties caused by incompatibility.

[0023] Preferably, the auxiliary cross-linking agent is selected from one or both of triallyl isocyanurate and trimethylolpropane trimethacrylate.

[0024] Preferably, the silane coupling agent is selected from one or more of 3-trimethoxysilane propyl acrylate, methacryloxypropyl triethoxysilane (Z-6030), and 1-methyl-2-(trimethoxysilyl)ethyl methacrylate.

[0025] Preferably, the second anti-ultraviolet agent is selected from one or both of tetramethyl piperidone and UV3853 ((C12-21 saturated, C18 unsaturated) fatty acid, 2,2,6,6-tetramethyl-4-piperidinyl ester).

[0026] Preferably, the added amount of the cross-linking agent accounts for 0.9-1.2% by mass of the packaging film.

[0027] Preferably, the amount of the auxiliary cross-linking agent added is 0.9-1.5% by mass of the packaging film.

[0028] Preferably, the added amount of the silane coupling agent accounts for 0.5-1% by mass of the packaging film.

[0029] Preferably, the added amount of the second anti-ultraviolet agent accounts for 0.1-0.2% by mass of the packaging film.

[0030] The present invention also provides an encapsulation film, which is a multi-layer structure, and at least one layer of the encapsulation film is the encapsulation film layer as described above. The multi-layer structure has more excellent mechanical properties, and the impact performance after being composited with laminated glass is excellent. At the same time, through different auxiliary agent ratios, the damping effect is synergistically enhanced, and the multi-layer structure has more excellent sound insulation performance. Compared with the traditional composite film, the concentration difference of the auxiliary agent at the interface of each layer of the film is reduced by composite modification of the film layer, the risk of auxiliary agent migration is reduced, and the reliability of the film is improved. Different functions, such as light filtering, heat insulation and the like, can also be achieved by composite modification of different structural layers.

[0031] The present invention also provides a method for preparing a packaging film, comprising the following steps: (1) Blending the resin matrix and polymer particles and extruding them to form granules to obtain masterbatches; (2) The masterbatch and the additive are mixed and cast and extruded to prepare an encapsulation film, wherein the maximum temperature of the extrusion casting is lower than 90°C.

[0032] The present invention also provides a use of a packaging film for preparing laminated glass. The packaging film of the present application has good sound insulation and damping effect, has excellent sound insulation effect, and can be used for preparing laminated glass.

[0033] As described above, the present invention has the following beneficial effects: (1) The encapsulation film of the present application includes a resin matrix and polymer particles dispersed in the resin matrix. The temperature range in which the loss factor of the two materials in the component is greater than 0.2 is greater than 60°C, and the damping performance is excellent. At the same time, the polymer particles and the resin matrix are in a semi-compatible transition state and have a strong interfacial force. The sound propagation vibration will dissipate part of the energy. The encapsulation film of the present application has good sound insulation and damping effect and has excellent sound insulation effect; (2) The preparation method of the encapsulation film of the present application is simple, has no special requirements for equipment, and the process conditions are easy to control and easy to industrialize; (3) The encapsulation film of the present application has good sound insulation and damping effect, and has excellent sound insulation effect, and can be used to prepare laminated glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram showing the structure of the packaging film of the present invention. DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0036] It should be noted that the process equipment or devices not specifically specified in the following embodiments are all conventional equipment or devices in the art.

[0037] In addition, it should be understood that one or more method steps mentioned in the present invention do not exclude the existence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified; it should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in the present invention does not exclude the existence of other devices / apparatuses before or after the combination device / apparatus or the insertion of other devices / apparatuses between these explicitly mentioned two devices / apparatuses, unless otherwise specified. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0038] Example 1 The present application embodiment provides a Figure 1 The encapsulation film shown comprises 84% ​​of an EVA resin matrix, 16% of PVB particles dispersed in the EVA resin matrix, and an additive. The VA content in the EVA resin matrix is ​​30%, the melt index is 10 g / 10 min (190° C. / 2.16 kg), the glass transition temperature of the EVA resin matrix is ​​-20° C., the transmittance of the EVA matrix resin in the visible light band of 400-760 nm is 91%, the haze is 0.50%, and the refractive index is 1.5. The material has excellent optical properties, high transmittance, and low haze. The particle size of the PVB particles is 0.2 μm, the glass transition temperature of the PVB particles is 19-26° C., the loss factor tanδ is greater than 0.2 in the temperature range of 40-50° C., the transmittance of the PVB particles in the visible light band of 400-760 nm is 92.5%, the haze is 0.1-0.3%, and the refractive index is 1.49-1.53.

[0039] The PVB particles contain 70% by weight of PVB resin powder, 29.8% by weight of plasticizer and 0.2% by weight of anti-ultraviolet agent UV326. The hydroxyl value of the PVB resin powder is 16%, the acetal value is 78% and the acetyl content is 6%.

[0040] This embodiment also provides a method for preparing the above-mentioned packaging film, comprising the following steps: (1) According to the above ratio, PVB resin powder, plasticizer triethylene glycol diisooctanoate (3G8) and anti-ultraviolet agent UV326 are mixed in a mixing kettle to obtain PVB particles. The temperature of the mixing kettle is controlled at 10°C, the mixing time is 3 minutes, the purification level of the mixing environment is above 100,000, and the humidity is 50%-70% to reduce the electrostatic adsorption of dust; the mixed PVB particles are stored in an environment of 0-5°C and 40-50% humidity, and the stacking thickness of the materials is not more than 1.5 cm to avoid particle adhesion; The EVA resin matrix and PVB particles are blended and extruded by a twin-screw extruder to obtain PVB particle-modified EVA masterbatch. The temperature of the feeding section is 40°C, the temperature of the compression section is 90°C, and the temperature of the homogenization section is 100°C. Based on the total mass of the PVB particle-modified EVA masterbatch, the weight percentage of the PVB particles is 16%, and the weight percentage of the EVA resin is 84%. (2) PVB particle modified EVA masterbatch, 1% by weight of 2,5-di-tert-butylperoxy-2,5-dimethylhexane (DHBP), 1% by weight of trimethylolpropane trimethacrylate (TMPTMA), 0.7% by weight of methacryloxypropyl triethoxysilane (Z-6030) and 0.2% by weight of anti-ultraviolet agent UV234 were added into a mixing kettle for mixing, and single-screw casting was used for film formation. The maximum processing temperature was lower than 90°C to obtain an encapsulation film.

[0041] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -17°C to 32°C, the transmittance of visible light 400-760nm was 91%, and the haze was 0.35%.

[0042] Example 2 The difference between Example 2 and Example 1 is that the proportions of the EVA resin matrix and the PVB particles in the encapsulation film are different, specifically, the EVA resin matrix accounts for 80% and the PVB particles account for 20%, and the rest of the formula and preparation method are exactly the same.

[0043] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -12°C to 40°C, the transmittance of visible light 400-760nm was 90.5%, and the haze was 0.50%.

[0044] Example 3 The difference between Example 3 and Example 1 is that the proportions of the EVA resin matrix and the PVB particles in the encapsulation film are different, specifically, the EVA resin matrix accounts for 60% and the PVB particles account for 40%, and the rest of the formula and preparation method are exactly the same.

[0045] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -22°C to 26°C, the transmittance of visible light 400-760nm was 90%, and the haze was 0.78%.

[0046] Example 4 The difference between Example 4 and Example 1 is that the proportions of the EVA resin matrix and the PVB particles in the encapsulation film are different, specifically, the EVA resin matrix accounts for 50% and the PVB particles account for 50%, and the rest of the formula and preparation method are exactly the same.

[0047] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -20°C to 30°C, the transmittance of visible light 400-760nm was 90%, and the haze was 0.98%.

[0048] Example 5 The difference between Example 5 and Example 1 is that the proportions of the EVA resin matrix and the PVB particles in the encapsulation film are different, specifically, the EVA resin matrix accounts for 90% and the PVB particles account for 10%, and the rest of the formula and preparation method are exactly the same.

[0049] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -20°C to 25°C, the transmittance of visible light 400-760nm was 91%, and the haze was 0.50%.

[0050] Example 6 The difference between Example 6 and Example 1 is that the type of resin matrix is ​​different, specifically a POE resin matrix is ​​used, the glass transition temperature of the POE resin matrix is ​​-15°C, and the refractive index of the POE resin matrix in the visible light band of 400~760nm is 1.51. The rest of the formula and preparation method are exactly the same.

[0051] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -17°C to 15°C, the transmittance of visible light 400-760nm was 90%, and the haze was 0.50%.

[0052] Example 7 The difference between Example 7 and Example 1 is that the type of polymer particles is different, specifically transparent PVC particles are used, and the rest of the formula and preparation method are exactly the same.

[0053] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -17°C to 30°C, the transmittance of visible light 400-760nm was 90%, and the haze was 0.50%.

[0054] Example 8 The difference between Example 8 and Example 1 is that the particle size of the PVB particles is different, specifically 0.1 μm, and the rest of the formula and preparation method are exactly the same.

[0055] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -17°C to 32°C, the transmittance of visible light 400-760nm was 91%, and the haze was 0.40%.

[0056] Example 9 The difference between Example 9 and Example 1 is that the particle size of the PVB particles is different, specifically 0.5 μm, and the rest of the formula and preparation method are exactly the same.

[0057] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -16°C to 36°C, the transmittance of visible light 400-760nm was 90.5%, and the haze was 0.50%.

[0058] Example 10 The difference between Example 10 and Example 1 is that the hydroxyl value of the PVB resin powder is different, specifically 15%, and the rest of the formula and preparation method are exactly the same.

[0059] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -18°C to 35°C, the transmittance of visible light 400-760nm was 90.8%, and the haze was 0.36%.

[0060] Embodiment 11 The difference between Example 11 and Example 1 is that the hydroxyl value of the PVB resin powder is different, specifically 17%, and the rest of the formula and preparation method are exactly the same.

[0061] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -17°C to 34°C, the transmittance of visible light 400-760nm was 91%, and the haze was 0.38%.

[0062] Example 12 The difference between Example 12 and Example 1 is that the acetal value of the PVB resin powder is different, specifically 79%, and the rest of the formula and preparation method are exactly the same.

[0063] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -17°C to 33°C, the transmittance of visible light 400-760nm was 91%, and the haze was 0.36%.

[0064] Embodiment 13 The difference between Example 13 and Example 1 is that the acetal value of the PVB resin powder is different, specifically 83%, and the rest of the formula and preparation method are exactly the same.

[0065] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -16°C to 35°C, the transmittance of visible light 400-760nm was 91.2%, and the haze was 0.38%.

[0066] Embodiment 14 The difference between Example 14 and Example 1 is that the acetyl content of the PVB resin powder is different, specifically 5%, and the rest of the formula and preparation method are exactly the same.

[0067] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -19°C to 30°C, the transmittance of visible light 400-760nm was 91.1%, and the haze was 0.48%.

[0068] Embodiment 15 The difference between Example 15 and Example 1 is that the acetyl content of the PVB resin powder is different, specifically 7%, and the rest of the formula and preparation method are exactly the same.

[0069] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -18°C to 32°C, the transmittance of visible light 400-760nm was 91.2%, and the haze was 0.30%.

[0070] Example 16 The difference between Example 16 and Example 1 is that the formula of the PVB particles is different, specifically comprising 64% of PVB resin powder and 36% of plasticizer, and the rest of the formula and preparation method are exactly the same.

[0071] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -20°C to 27°C, the transmittance of visible light 400-760nm was 92%, and the haze was 0.32%.

[0072] Embodiment 17 The difference between Example 17 and Example 1 is that the formula of the PVB particles is different, specifically comprising 74% of PVB resin powder and 26% of plasticizer, and the rest of the formula and preparation method are exactly the same.

[0073] The performance of the encapsulation film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the encapsulation film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -18°C to 35°C, the transmittance of visible light 400-760nm was 90.1%, and the haze was 0.38%.

[0074] Embodiment 18 The difference between Example 18 and Example 1 is that the encapsulation film is a multi-layer structure, and the specific preparation method is to bond one side of the encapsulation film prepared in Example 1 to the PVB film layer through a bonding process.

[0075] Among them, the preparation method of the PVB film layer is: using 65% by mass of PVB resin powder, 34% by mass of plasticizer, 0.5% by mass of anti-ultraviolet agent UV326, and 0.5% by mass of antioxidant 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate) through a twin-screw extruder at 145°C, and casting over a pressure roller to bond the packaging film.

[0076] The performance of the multi-layer packaging film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the packaging film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -25°C to 38°C, the transmittance of visible light 400-760nm was 90.4%, and the haze was 0.45%.

[0077] Embodiment 19 The difference between Example 19 and Example 1 is that the encapsulation film is a multi-layer structure, and the specific preparation method is to laminate both sides of the encapsulation film prepared in Example 1 with the PVB film layer through a laminating process.

[0078] Among them, the preparation method of the PVB film layer is: using 73% by mass of PVB resin powder, 26.4% by mass of plasticizer, 0.35% by mass of anti-ultraviolet agent UV326, and 0.25% by mass of antioxidant 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate), extruding through a twin-screw extruder at 155°C, and casting over a pressure roller to bond the packaging film.

[0079] The performance of the multi-layer packaging film prepared in this embodiment was tested, and the lamination conditions of the performance test were 152°C and 32 minutes. The test results showed that the packaging film prepared in this embodiment had good sound insulation and damping effects, the temperature range of the loss factor tanδ>0.2 was -20°C to 55°C, the transmittance of visible light 400-760nm was 91%, and the haze was 0.48%.

[0080] The above examples are for the purpose of illustrating the embodiments disclosed by the present invention and are not to be construed as limitations of the present invention. In addition, the various modifications listed herein and the variations of methods and compositions in the invention are obvious to those skilled in the art without departing from the scope and spirit of the present invention. Although the present invention has been specifically described in conjunction with various specific preferred embodiments of the present invention, it should be understood that the present invention should not be limited to these specific embodiments. In fact, various modifications obvious to those skilled in the art as described above to obtain the invention should be included within the scope of the present invention.

Claims

1. A packaging film, characterized in that: It includes a resin matrix and polymer particles dispersed in the resin matrix; Based on 100 parts by weight of the resin matrix, 10 to 100 parts of the polymer particles are dispersed in the resin matrix; The glass transition temperature of the resin matrix is ​​-20~5°C, and the temperature range in which the loss factor tanδ of the resin matrix is ​​greater than 0.2 is 15~20°C; The glass transition temperature of the polymer particles is 19-26°C, and the temperature range in which the loss factor tanδ of the polymer particles is greater than 0.2 is 30-40°C.

2. The packaging film according to claim 1, characterized in that: Based on 100 parts by weight of the resin matrix, 10 to 25 parts of the polymer particles are dispersed in the resin matrix.

3. The packaging film according to claim 1, characterized in that: The polymer particles have a light transmittance of 92-94% in the visible light band of 400-760 nm, a haze of 0.05-0.5%, and a refractive index of 1.49-1.53; And / or, the resin matrix has a light transmittance of 90-91% in the visible light band of 400-760 nm, a haze of 0.3-1%, and a refractive index of 1.49-1.

54.

4. The packaging film according to claim 1, characterized in that: The resin matrix is ​​selected from one or both of EVA and POE; The melt index of the resin matrix is ​​7-10 g / 10 min; And / or, the polymer particles are selected from one or more of PVB particles, PMMA particles, transparent PVC particles, silicone rubber particles, and fluorinated ethylene propylene particles, and the particle size of the polymer particles is 0.1-0.5 μm.

5. The packaging film according to claim 4, characterized in that: The polymer particles include PVB resin powder; The resin matrix is ​​EVA resin; the VA content in the EVA resin is 28-33%; The PVB resin powder has a hydroxyl value of 15-17%, an acetal value of 79-83%, and an acetyl content of 5-7%; The particle size of the PVB resin powder is 0.1-0.2 μm.

6. The packaging film according to claim 5, characterized in that: The polymer particles further contain a plasticizer. Based on the total mass of the polymer particles, the amount of the PVB resin powder added is 64-74%, and the amount of the plasticizer added is 26-36%; Preferably, the polymer particles further include a first anti-ultraviolet agent, and the added amount of the first anti-ultraviolet agent is 0.1-0.25% of the total mass of the PVB resin powder and the plasticizer.

7. The packaging film according to claim 1, characterized in that: The encapsulation film further comprises an auxiliary agent, wherein the auxiliary agent is selected from one or more of a cross-linking agent, a co-cross-linking agent, a silane coupling agent and a second anti-ultraviolet agent; Preferably, the amount of the cross-linking agent added is 0.9-1.2% by mass of the packaging film; And / or, the amount of the auxiliary cross-linking agent added is 0.9-1.5% by mass of the packaging film; And / or, the added amount of the silane coupling agent accounts for 0.5-1% by mass of the packaging film; And / or, the added amount of the second anti-ultraviolet agent accounts for 0.1-0.2% by mass of the packaging film; Preferably, the crosslinking agent is selected from one or more of peroxide, tert-butyl peroxycarbonate-2-ethylhexyl ester, 2,5-di-tert-butyl peroxy-2,5-dimethylhexane; And / or, the auxiliary cross-linking agent is selected from one or both of triallyl isocyanurate and trimethylolpropane trimethacrylate; And / or, the silane coupling agent is selected from one or more of 3-trimethoxysilane propyl acrylate, methacryloxypropyl triethoxysilane, and 1-methyl-2-(trimethoxysilyl)ethyl methacrylate; And / or, the second anti-ultraviolet agent is selected from one or both of tetramethyl piperidine ketone and UV3853.

8. A packaging film, the packaging film having a multi-layer structure, characterized in that: At least one layer of the encapsulation film is the encapsulation film layer according to any one of claims 1 to 7.

9. A method for preparing a packaging film as claimed in claim 6, characterized in that: The following steps are involved: (1) Blending the resin matrix and polymer particles and extruding them to form granules to obtain masterbatches; (2) The masterbatch and the additive are mixed and cast and extruded to prepare an encapsulation film, wherein the maximum temperature of the extrusion casting is lower than 90°C.

10. Use of the encapsulation film according to any one of claims 1 to 8 for preparing laminated glass.

Images