Ionic safety laminated glass interlayer and method of making

Abstract

The present application relates to the field of interlayer film of laminated glass, and particularly relates to an ionic safety interlayer film of laminated glass and a preparation method thereof. The components of the interlayer film include ethylene methacrylic acid copolymer metal salt, coupling agent, initiator, trimethylolpropane trimethacrylate, grafting monomer, chain extender and molecular weight regulator; the preparation method includes the following steps: mixing the ethylene methacrylic acid copolymer metal salt, initiator and grafting monomer in a high-speed mixer to obtain a first mixture; mixing the first mixture, coupling agent, trimethylolpropane trimethacrylate, chain extender and molecular weight regulator in a high-speed mixer to obtain a second mixture; and inputting the second mixture into a screw extruder to extrude the ionic safety interlayer film of laminated glass. The ionic safety interlayer film of laminated glass has low raw material cost and high tensile strength, and is suitable for laminated glass of high safety demand facilities.

Description

Technical Field

[0001] This invention relates to the field of interlayer films in laminated glass, and particularly to an ion-safe interlayer film for laminated glass and its preparation method. Background Technology

[0002] Laminated glass is made by bonding two or more sheets of glass together. The bonding layer between the laminated glass sheets is called the interlayer. The good toughness and adhesion of the interlayer improve the glass properties, giving laminated glass strong impact resistance. Laminated glass can be used in automobiles, buildings, and public facilities. Currently, there are roughly three types of interlayer films for laminated glass: EVA film, PVB film, and SGP film. Among them, EVA film is slightly softer and has a lower tensile strength of about 12 MPa, and is generally used for decorative glass; PVB film is relatively soft and has a tensile strength of about 30 MPa, and can be used for automotive windshields; while SGP film has high hardness and a tensile strength of about 40 MPa, and can be used for facilities with high safety requirements such as glass walkways. PVB film is prone to yellowing and has poor water resistance; EVA film has low strength and can only be used for decorative materials; the main material of SGP film is saline resin, which is an ionic film. Saline resin is expensive, which greatly increases the cost of building materials.

[0003] In the prior art, there are ionomer interlayers that do not use sarin resin. For example, CN108587022A discloses a high-performance ionomer interlayer and its preparation method, which consists of acrylic resin, initiator, chain transfer agent, and epoxy monomer, improving the hot water resistance of the ionomer interlayer. Another example is CN105269794A, which discloses a method for preparing an ionomer interlayer for safety glass, using an ethylene-acrylic acid copolymer as the base material. Additives include plasticizers, toughening agents, anti-aging agents, compatibilizers, coupling agents, antioxidants, UV stabilizers, lubricants, nucleating agents, antistatic agents, impact modifiers, and fillers. The specific names of the additives are not specified. This patent application describes a technique used to simplify the preparation process of the ionomer interlayer. Therefore, it is necessary to provide an ionomer interlayer for safety laminated glass that is low-cost, has excellent tensile strength, and is suitable for facilities with high safety requirements. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an ionized safety interlayer for laminated glass, which has low raw material cost and high tensile strength, and is suitable for laminated glass in facilities with high safety requirements.

[0005] Another objective of this invention is to provide a method for preparing an interlayer film of ion-safe laminated glass, which improves product performance by limiting the mixing sequence and process temperature.

[0006] The technical solution adopted in this invention is as follows:

[0007] An ionotropic safety interlayer glass comprises an ethylene methacrylate copolymer metal salt, a coupling agent, an initiator, trimethylolpropane trimethacrylate, a graft monomer, a chain extender, and a molecular weight regulator.

[0008] Furthermore, the interlayer of the ionotropic safety laminated glass comprises, by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.1 to 0.8 parts of coupling agent, 0.02 to 1.2 parts of initiator, 0.3 to 1.2 parts of trimethylolpropane trimethacrylate, 0.5 to 5 parts of graft monomer, 0.3 to 1.8 parts of chain extender, and 0.3 to 2 parts of molecular weight regulator.

[0009] Furthermore, the components of the interlayer of the ionotropic safety laminated glass include, by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.1 to 0.8 parts of coupling agent, 0.1 to 0.4 parts of initiator, 0.6 to 0.8 parts of trimethylolpropane trimethacrylate, 1 to 2 parts of graft monomer, 0.5 to 0.8 parts of chain extender, and 0.8 to 1 part of molecular weight regulator.

[0010] Furthermore, the coupling agent is selected from one or both of γ-methacryloxypropyltrimethoxysilane and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0011] Furthermore, the initiator is selected from one or both of benzoyl peroxide and 2-ethylhexylpentyl peroxide.

[0012] Furthermore, the grafting monomer is selected from one or more of 2-phenoxyethyl acrylate, ethoxyethoxyethyl acrylate, glycidyl methacrylate, and polypropylene glycol diglycidyl ether.

[0013] Furthermore, the chain extender is selected from one or both of 1,4-butanediol and 1,6-ethylenediol.

[0014] Furthermore, the molecular weight regulator is selected from one or both of tert-dodecyl mercaptan and C12-14 alcohol.

[0015] Furthermore, the interlayer of the ionotropic safety laminated glass also includes, by weight, 0.1 to 0.8 parts of ultraviolet absorber, 0.1 to 0.8 parts of light stabilizer, and 0.01 to 0.8 parts of antioxidant.

[0016] A method for preparing an ion-safe interlayer film in laminated glass includes the following steps:

[0017] (1) The metal salt of ethylene methacrylic acid copolymer, initiator and graft monomer are mixed in a high-speed mixer to obtain the first mixture;

[0018] (2) The first mixture, coupling agent, trimethylolpropane trimethacrylate, chain extender and molecular weight regulator are mixed in a high-speed mixer to obtain the second mixture;

[0019] (3) The second mixture is fed into a screw extruder and extruded to obtain the above-mentioned ion-safe laminated glass interlayer film; wherein the temperature of the screw extruder is set as follows: first section 130℃, second section 160℃, third section 170℃, fourth section 180℃, fifth section 180℃, sixth section 180℃, seventh section 175℃, eighth section 175℃, and die head temperature 170℃.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. In the formulation system of this technical solution, the ethylene methacrylate copolymer metal salt, coupling agent, initiator, trimethylolpropane trimethacrylate, graft monomer, chain extender and molecular weight regulator work together to give the interlayer of the laminated glass ultra-high strength and excellent adhesion, with a tensile strength of over 40MPa, making it suitable for laminated glass in high-safety facilities.

[0022] The combined use of 2,2-phenoxyethyl acrylate (PHEA) and polypropylene glycol diglycidyl ether (PPGDGE) as grafting monomers can further improve the strength properties of the interlayer membrane; tert-dodecyl mercaptan and C12-14 alcohol are also beneficial to improving the performance of the interlayer membrane.

[0023] 3. In the preparation method of the present invention, the pre-reaction step and the temperature setting of the screw extruder are both beneficial to obtaining a high-performance intermediate film. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The present invention provides a technical solution: an ion-safe interlayer glass film, the components of which include ethylene methacrylate copolymer metal salt, coupling agent, initiator, trimethylolpropane trimethacrylate (TMPTMA), graft monomer, chain extender and molecular weight regulator.

[0026] In the formulation system of this technical solution, the grafted monomer can increase the molecular chain length after cross-linking, improve the cross-linking density, and enhance the strength performance of the interlayer film. The chain extender increases the chain length after the grafting reaction of the ethylene methacrylate copolymer metal salt, coupling agent, initiator, and TMPTMA, thereby improving the hardness and tensile strength of the interlayer film. The molecular weight regulator is used to control the grafting reaction rate and molecular weight distribution. Therefore, the formulation system of this invention enables the interlayer film of laminated glass to possess ultra-high strength and excellent adhesion, with a tensile strength exceeding 40 MPa, making it suitable for laminated glass in high-safety facilities. Moreover, the cost of the ethylene methacrylate copolymer metal salt is much lower than that of sarin resin, making the interlayer film of this invention low-cost and easier to widely promote and apply. Specifically, the ethylene methacrylate copolymer metal salt can be selected from sodium salt, zinc salt, or magnesium salt; in the embodiments of this invention, the ethylene methacrylate copolymer metal salt is preferably a zinc salt.

[0027] Specifically, the components of the ionotropic safety interlayer glass of the present invention include 100 parts by weight of ethylene methacrylate copolymer metal salt, 0.1-0.8 parts by weight of coupling agent, 0.02-1.2 parts by weight of initiator, 0.3-1.2 parts by weight of trimethylolpropane trimethacrylate, 0.5-5 parts by weight of graft monomer, 0.3-1.8 parts by weight of chain extender, and 0.3-2 parts by weight of molecular weight regulator. By limiting the amount of each component in the formulation system, the haze is reduced while ensuring the ultra-high tensile strength of the interlayer glass. If the amount of graft monomer, chain extender, and molecular weight regulator is too large, it will result in high product haze, affecting the adhesive performance of the product.

[0028] The interlayer of the fully laminated glass comprises, by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.1–0.8 parts of coupling agent, 0.1–0.4 parts of initiator, 0.6–0.8 parts of trimethylolpropane trimethacrylate, 1–2 parts of graft monomer, 0.5–0.8 parts of chain extender, and 0.8–1 parts of molecular weight regulator. By further limiting the amount of each component in the formulation, the safety interlayer of the laminated glass exhibits higher tensile strength and lower haze.

[0029] Preferably, the coupling agent is selected from one or both of γ-methacryloxypropyltrimethoxysilane and γ-(2,3-epoxypropoxy)propyltrimethoxysilane. These two silane coupling agents have good compatibility with other substances in the formulation and also enable the interlayer to have excellent adhesion to the glass.

[0030] Preferably, the initiator is selected from one or both of benzoyl peroxide and 2-ethylhexylpentyl peroxide. The peroxy group of the initiator splits into free radicals upon heating, initiating monomer polymerization. Both of these initiators play a significant role in initiating polymerization in the formulation system of this invention. Simultaneously, the polymerization of TMPTMA, the initiator, and the coupling agent with the ethylene methacrylate copolymer metal salt improves the tensile strength, heat resistance, and weather resistance of the intermediate film.

[0031] Preferably, the grafting monomer is selected from one or more of 2-phenoxyethyl acrylate (PHEA), ethoxyethoxyethyl acrylate (EOEOEA), glycidyl methacrylate (GMA), and polypropylene glycol diglycidyl ether (PPGDGE). PHEA improves the adhesion of the interlayer to glass and the hardness of the interlayer; EOEOEA improves the adhesion of the interlayer to glass and the flexibility of the interlayer. GMA is polymerized via an ionic reaction, improving the tensile strength of the interlayer; PPGDGE improves the toughness and tensile strength of the interlayer.

[0032] Preferably, the chain extender is selected from one or both of 1,4-butanediol and 1,6-ethylenediol. 4-Butanediol and 1,6-ethylenediol have high participation rates in the system reaction, resulting in a significant improvement in the performance of the intermediate membrane.

[0033] Preferably, the molecular weight regulator is selected from one or both of tert-dodecyl mercaptan and C12-14 alcohol. C12-14 alcohol can transfer growing free radicals to monomers or other molecules, thereby controlling the polymerization rate and molecular weight distribution. This effectively regulates the polymerization process, ensuring the product has ideal molecular weight and properties. Tert-dodecyl mercaptan can react with growing chain free radicals, causing polymer chains to break during growth, thereby reducing the polymer's molecular weight and preventing excessive hardness of the interlayer caused by over-polymerization, which would reduce tensile strength.

[0034] In one embodiment of the present invention, the interlayer of the ionotropic safety laminated glass further comprises 0.1 to 0.8 parts by weight of an ultraviolet absorber, 0.1 to 0.8 parts by weight of a light stabilizer, and 0.01 to 0.8 parts by weight of an antioxidant, thereby giving the interlayer resistance to ultraviolet radiation and oxidation, and extending its service life. Specifically, the ultraviolet absorber is selected from one or two of 2-hydroxy-4-n-octyloxybenzophenone and 2-(2'-hydroxy-3',5'-di-tert-phenyl)-5-chlorobenzotriazole; the light stabilizer is selected from 4-benzoyloxy-2,2,6,6-tetramethylpiperidine,

[0035] The succinic acid is a polymer of (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol) and poly[[6-[(1,1,3,3-tetramethylbutyl)amine]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidin)imine]-1,6-dihexadiyl[(2,2,6,6-tetramethyl-1-piperidin)imine]]]. The antioxidant is selected from one or two of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2,4-di-tert-butylphenyl]phosphite.

[0036] Accordingly, the present invention also provides a method for preparing an interlayer film of ion-safe laminated glass, comprising the following steps:

[0037] (1) The metal salt of ethylene methacrylic acid copolymer, initiator and graft monomer are mixed in a high-speed mixer to obtain the first mixture;

[0038] (2) The first mixture, coupling agent, trimethylolpropane trimethacrylate, chain extender and molecular weight regulator are mixed in a high-speed mixer to obtain the second mixture;

[0039] (3) The second mixture is fed into a screw extruder and extruded to obtain the above-mentioned ion-safe laminated glass interlayer film; wherein the temperature of the screw extruder is set as follows: first section 130℃, second section 160℃, third section 170℃, fourth section 180℃, fifth section 180℃, sixth section 180℃, seventh section 175℃, eighth section 175℃, and die head temperature 170℃.

[0040] The preparation method of this invention achieves thorough mixing and reaction by limiting the mixing sequence and process temperature, thereby obtaining a safety interlayer glass with ultra-high strength that can be used in high-safety facilities. In step (1), the ethylene methacrylate copolymer metal salt, initiator, and graft monomer undergo pre-reaction to improve the full polymerization of the graft monomer and the ethylene methacrylate copolymer metal salt. The screw extruder is designed with eight temperature zones and a gentle temperature difference curve to ensure sufficient graft polymerization reaction and obtain a glass interlayer with high tensile strength and suitable hardness.

[0041] When the formulation contains UV absorbers, light stabilizers, and antioxidants, the antioxidants are incorporated in step (1) to prevent denaturation of the product obtained in the pre-reaction process and to ensure that the first mixture and other components complete the stop polymerization reaction in the screw extruder. The UV absorbers and light stabilizers are incorporated in step (2).

[0042] The present invention will be further illustrated below through examples and comparative examples.

[0043] Example 1

[0044] The formulation of the interlayer film of the ionic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.1 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.02 parts of benzoyl peroxide, 0.3 parts of trimethylolpropane trimethacrylate, 0.5 parts of 2-phenoxyethyl acrylate, 0.3 parts of 1,4-butanediol and 0.3 parts of tert-dodecyl mercaptan.

[0045] The intermediate membrane of this embodiment is prepared by the following steps:

[0046] (1) According to the formula, the metal salt of ethylene methacrylic acid copolymer, initiator and graft monomer are mixed in a high-speed mixer to obtain the first mixture;

[0047] (2) According to the formula amount, the first mixture, coupling agent, trimethylolpropane trimethacrylate, chain extender and molecular weight regulator are mixed in a high-speed mixer to obtain the second mixture;

[0048] (3) The second mixture is fed into a screw extruder and extruded to obtain the above-mentioned ion-safe laminated glass interlayer film; wherein the temperature of the screw extruder is set as follows: first section 130℃, second section 160℃, third section 170℃, fourth section 180℃, fifth section 180℃, sixth section 180℃, seventh section 175℃, eighth section 175℃, and die head temperature 170℃.

[0049] Example 2

[0050] The formulation of the interlayer film of the ionotropic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.8 parts of γ-methacryloyloxypropyltrimethoxysilane, 1.2 parts of benzoyl peroxide, 1.2 parts of trimethylolpropane trimethacrylate, 5 parts of 2-phenoxyethyl acrylate, 1.8 parts of 1,4-butanediol and 2 parts of tert-dodecyl mercaptan.

[0051] The preparation steps of the intermediate membrane in this embodiment are the same as those in Example 1.

[0052] Example 3

[0053] The formulation of the interlayer film of the ionic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.1 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.1 parts of benzoyl peroxide, 0.6 parts of trimethylolpropane trimethacrylate, 1 part of 2-phenoxyethyl acrylate, 0.5 parts of 1,4-butanediol and 0.8 parts of tert-dodecyl mercaptan.

[0054] The preparation steps of the intermediate membrane in this embodiment are the same as those in Example 1.

[0055] Example 4

[0056] The formulation of the interlayer film of the ionic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.8 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.4 parts of benzoyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, 2 parts of 2-phenoxyethyl acrylate, 0.8 parts of 1,4-butanediol and 1 part of tert-dodecyl mercaptan.

[0057] The preparation steps of the intermediate membrane in this embodiment are the same as those in Example 1.

[0058] Example 5

[0059] The formulation of the interlayer film of the ionotropic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.8 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.4 parts of benzoyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, 1.5 parts of 2-phenoxyethyl acrylate, 0.6 parts of 1,4-butanediol and 0.8 parts of tert-dodecyl mercaptan.

[0060] The preparation steps of the intermediate membrane in this embodiment are the same as those in Example 1.

[0061] Example 6

[0062] The formulation of the interlayer film of the ionotropic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 0.4 parts of 2-ethylhexylpentyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, 1.5 parts of 2-phenoxyethyl acrylate, 0.6 parts of 1,6-ethylene glycol, 0.8 parts of tert-dodecyl mercaptan, 0.1 parts of ultraviolet absorber, 0.1 parts of light stabilizer, and 0.01 parts of antioxidant.

[0063] The preparation steps of the intermediate membrane in this embodiment are the same as those in Example 1.

[0064] Example 7

[0065] The formulation of the interlayer film of the ionotropic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 0.4 parts of 2-ethylhexylpentyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, 1.5 parts of 2-phenoxyethyl acrylate, 0.6 parts of 1,4-butanediol, 0.8 parts of tert-dodecyl mercaptan, 0.8 parts of ultraviolet absorber, 0.8 parts of light stabilizer, and 0.8 parts of antioxidant.

[0066] The preparation steps of the intermediate membrane in this embodiment are the same as those in Example 1.

[0067] Comparative Example 1

[0068] The formulation of the interlayer film of the ionized safety laminated glass in this comparative example is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.8 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.4 parts of benzoyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, and 1.5 parts of 2-phenoxyethyl acrylate.

[0069] The intermediate membrane of this comparative example was prepared by the following steps:

[0070] (1) According to the formula, the metal salt of ethylene methacrylic acid copolymer, initiator and graft monomer are mixed in a high-speed mixer to obtain the first mixture;

[0071] (2) According to the formula amount, the first mixture, γ-methacryloyloxypropyltrimethoxysilane and trimethylolpropane trimethacrylate are mixed in a high-speed mixer to obtain the second mixture;

[0072] (3) The second mixture is fed into a screw extruder and extruded to obtain the above-mentioned ion-safe laminated glass interlayer film; wherein the temperature of the screw extruder is set as follows: first section 130℃, second section 160℃, third section 170℃, fourth section 180℃, fifth section 180℃, sixth section 180℃, seventh section 175℃, eighth section 175℃, and die head temperature 170℃.

[0073] Comparative Example 2

[0074] The formulation of the interlayer film of the ionic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.8 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.4 parts of benzoyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, 1.5 parts of 2-phenoxyethyl acrylate and 0.6 parts of 1,4-butanediol.

[0075] The intermediate membrane of this comparative example was prepared by the following steps:

[0076] (1) According to the formula, the metal salt of ethylene methacrylic acid copolymer, initiator and graft monomer are mixed in a high-speed mixer to obtain the first mixture;

[0077] (2) According to the formula, the first mixture, coupling agent, trimethylolpropane trimethacrylate and chain extender are mixed in a high-speed mixer to obtain the second mixture;

[0078] (3) The second mixture is fed into a screw extruder and extruded to obtain the above-mentioned ion-safe laminated glass interlayer film; wherein the temperature of the screw extruder is set as follows: first section 130℃, second section 160℃, third section 170℃, fourth section 180℃, fifth section 180℃, sixth section 180℃, seventh section 175℃, eighth section 175℃, and die head temperature 170℃.

[0079] Comparative Example 3

[0080] The formulation of this comparative example is the same as that of Example 1, except that the intermediate film of this comparative example is prepared by the following steps:

[0081] (1) According to the formula, the metal salt of ethylene methacrylate copolymer, initiator, graft monomer, γ-methacryloyloxypropyltrimethoxysilane, trimethylolpropane trimethacrylate, chain extender and molecular weight regulator are mixed in a high-speed mixer to obtain a mixture;

[0082] (2) The second mixture is fed into a screw extruder and extruded to obtain the above-mentioned ion-safe laminated glass interlayer film; wherein the temperature of the screw extruder is set as follows: first section 130℃, second section 160℃, third section 170℃, fourth section 180℃, fifth section 180℃, sixth section 180℃, seventh section 175℃, eighth section 175℃, and die head temperature 170℃.

[0083] Comparative Example 4

[0084] The formulation of this comparative example is the same as that of Example 1, except that the intermediate film of this comparative example is prepared by the following steps:

[0085] (1) According to the formula, the metal salt of ethylene methacrylic acid copolymer, initiator and graft monomer are mixed in a high-speed mixer to obtain the first mixture;

[0086] (2) According to the formula amount, the first mixture, γ-methacryloxypropyltrimethoxysilane, trimethylolpropane trimethacrylate, chain extender and molecular weight regulator are mixed in a high-speed mixer to obtain the second mixture;

[0087] (3) The second mixture is fed into a screw extruder and extruded to obtain the above-mentioned ion-safe laminated glass interlayer film; wherein the temperature of the screw extruder is set as follows: first section 130℃, second section 160℃, third section 180℃, fourth section 190℃, fifth section 200℃, sixth section 190℃, seventh section 190℃, eighth section 175℃, and die temperature 170℃.

[0088] The performance of the interlayer films obtained in Examples 1-7 and Comparative Examples 1-4 was tested. Tensile strength and tear strength tests were performed on interlayer films with a thickness of 0.76 mm. Laminated glass samples were prepared by sandwiching 0.76 mm thick interlayer films between two 5 mm thick glass sheets, and haze and glass adhesion peel strength tests were performed. The test results are shown in the table below.

[0089]

[0090] As shown in the table above, the ionic safety interlayer of the present invention exhibits excellent tensile strength, tear strength, and adhesion to glass, while also exhibiting low haze. The chain extender and molecular weight regulator significantly improve the tensile strength, tear strength, and adhesion to glass of the interlayer. The premixing step and extrusion temperature settings in the preparation method of the present invention are beneficial for improving the strength properties of the interlayer.

[0091] Example Group A

[0092] The formulation of the interlayer membrane for the ionotropic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.8 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.4 parts of benzoyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, 1.5 parts of grafted monomer, 0.6 parts of 1,4-butanediol, and 0.8 parts of tert-dodecyl mercaptan. The preparation steps of the interlayer membrane in this embodiment are the same as those in Example 1.

[0093] The grafting monomer components and dosage ratios of this embodiment are shown in the table below.

[0094]

[0095] Tensile strength, tear strength and glass adhesion peel strength tests were performed on the intermediate film of this embodiment group, and the results are shown in the table below.

[0096]

[0097] It is evident that the intermediate film obtained by combining 2-phenoxyethyl acrylate and polypropylene glycol diglycidyl ether exhibits higher strength properties.

[0098] Example Group B

[0099] The formulation of the interlayer film of the ionotropic safety laminated glass in this embodiment is as follows: by weight, 100 parts of ethylene methacrylate copolymer metal salt, 0.8 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.4 parts of benzoyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, 1.5 parts of 2-phenoxyethyl acrylate, 0.6 parts of 1,4-butanediol, and 0.8 parts of molecular weight regulator. The preparation steps of the interlayer film in this embodiment are the same as those in Example 1.

[0100] The molecular weight regulators selected in this embodiment are shown in the table below.

[0101]

[0102] Tensile strength, tear strength and glass adhesion peel strength tests were performed on the intermediate film of this embodiment group, and the results are shown in the table below.

[0103]

[0104] It is evident that the combined use of tert-dodecyl mercaptan and C12-14 alcohol has an effect on improving the tear strength of the interlayer and the glass-to-glass adhesive peel strength.

[0105] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ionotropic safety interlayer film for laminated glass, characterized in that, Its components include, by weight, 100 parts of zinc salt of ethylene methacrylate copolymer, 0.1-0.8 parts of coupling agent, 0.02-1.2 parts of initiator, 0.3-1.2 parts of trimethylolpropane trimethacrylate, 0.5-5 parts of graft monomer, 0.3-1.8 parts of chain extender and 0.3-2 parts of molecular weight regulator; The grafting monomer is selected from one or more of 2-phenoxyethyl acrylate, ethoxyethoxyethyl acrylate, glycidyl methacrylate and polypropylene glycol diglycidyl ether; The chain extender is 1,4-butanediol; The molecular weight regulator is selected from one or both of tert-dodecyl mercaptan and C12-14 alcohol; The preparation method of the interlayer film of the ion-safe laminated glass includes the following steps: (1) The ethylene methacrylic acid copolymer metal salt, initiator and graft monomer are mixed in a high-speed mixer to obtain the first mixture; (2) The first mixture, coupling agent, trimethylolpropane trimethacrylate, chain extender and molecular weight regulator are mixed in a high-speed mixer to obtain the second mixture; (3) The second mixture is fed into a screw extruder and extruded to obtain the ion-safe laminated glass interlayer film; wherein the temperature of the screw extruder is set as follows: 130°C for the first section, 160°C for the second section, 170°C for the third section, 180°C for the fourth section, 180°C for the fifth section, 180°C for the sixth section, 175°C for the seventh section, 175°C for the eighth section, and 170°C for the die head.

2. The interlayer film of the ionogenic safety laminated glass according to claim 1, characterized in that, Its components include 100 parts by weight of ethylene methacrylate copolymer metal salt, 0.1-0.8 parts by weight of coupling agent, 0.1-0.4 parts by weight of initiator, 0.6-0.8 parts by weight of trimethylolpropane trimethacrylate, 1-2 parts by weight of graft monomer, 0.5-0.8 parts by weight of chain extender and 0.8-1 parts by weight of molecular weight regulator.

3. The interlayer film of the ionogenic safety laminated glass according to claim 2, characterized in that, The coupling agent is selected from one or both of γ-methacryloxypropyltrimethoxysilane and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

4. The interlayer film of the ionogenic safety laminated glass according to claim 2, characterized in that, The initiator is selected from one or both of benzoyl peroxide and 2-ethylhexylpentyl peroxide.

5. The interlayer film of the ionotropic safety laminated glass according to claim 2, characterized in that, Its components also include 0.1 to 0.8 parts by weight of ultraviolet absorber, 0.1 to 0.8 parts of light stabilizer and 0.01 to 0.8 parts of antioxidant.

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