Ionic safe laminated glass intermediate film and preparation method thereof

Abstract

The invention relates to the field of laminated glass intermediate films, in particular to an ionic safe laminated glass intermediate film and a preparation method thereof. The middle membrane comprises the following components: ethylene methacrylic acid copolymer metal salt, a coupling agent, an initiator, trimethylolpropane trimethacrylate, a grafting monomer, a chain extender and a molecular weight regulator; the preparation method comprises the following steps: mixing ethylene methacrylic acid copolymer metal salt, an initiator and a grafting monomer in a high-speed mixer to obtain a first mixture; mixing the first mixture, a coupling agent, trimethylolpropane trimethacrylate, a chain extender and a molecular weight regulator in a high-speed mixer to obtain a second mixture; and inputting the second mixture into a screw extruder, and extruding to obtain the ionic safe laminated glass intermediate film. The ionic safe laminated glass intermediate film is low in raw material cost, high in tensile strength and suitable for laminated glass of facilities with high safety requirements.

Description

Technical Field

[0001] The present invention relates to the field of interlayer films for laminated glass, and particularly to an ionic safety interlayer film for laminated glass and a preparation method thereof. Background Art

[0002] Laminated glass is bonded by two or more pieces of glass. The bonding layer in the middle of the laminated glass is the interlayer film for laminated glass. The good toughness and bonding ability of the interlayer film can improve the performance of the glass, making the laminated glass have strong impact resistance. Laminated glass can be used in automobiles, buildings and public facilities. At present, there are roughly three types of interlayer films for laminated glass: EVA film, PVB film and SGP film. Among them, the EVA film is slightly soft and has a small tensile strength of about 12 MPa, and is generally used for decorative glass; the PVB film is relatively soft and has a tensile strength of about 30 MPa, and can be used for the front glass of automobiles; while the SGP film is hard and has a tensile strength of about 40 MPa, and can be used for facilities with high safety requirements such as glass walkways. The PVB film is prone to yellowing and has poor water resistance. The EVA film has low strength and can only be used as a decorative material. The main material of the SGP film is sarin resin, which is an ionic film. The price of sarin resin is expensive, which greatly increases the cost of building materials.

[0003] In the prior art, there are ionic interlayer films that do not use sarin resin. For example, a high-performance ionic interlayer film and a preparation method thereof disclosed in CN108587022A, the components are acrylic resin, initiator, chain transfer agent and epoxy monomer, which improve the hot water resistance of the ionic interlayer film. Another example is a preparation method of an ionic interlayer film for safety glass disclosed in CN105269794A, which uses a copolymer of ethylene acrylic acid as the base material, and the additives are plasticizer, toughening agent, anti-aging agent, compatibilizer, coupling agent, antioxidant, ultraviolet stabilizer, lubricant, nucleating agent, antistatic agent, impact resistance improver, filler, and the specific names of the substances used as additives are not recorded. The technology described in this patent application is used to simplify the preparation process of the ionic interlayer film. In view of this, it is necessary to provide an ionic safety interlayer film for laminated glass with low cost and excellent tensile strength, which is suitable for facilities with high safety requirements. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide an ionic safety interlayer film for laminated glass, which has low raw material cost and high tensile strength, and is suitable for laminated glass of facilities with high safety requirements;

[0005] Another purpose of the present invention is to provide a preparation method of an ionic safety interlayer film for laminated glass, which improves the product performance by limiting the mixing order and process temperature.

[0006] The technical solution adopted by the present invention is as follows:

[0007] An ionic safety interlayer film for laminated glass, the components of which include metal salts of ethylene methacrylic acid copolymer, coupling agent, initiator, trimethylolpropane trimethacrylate, graft monomer, chain extender and molecular weight regulator.

[0008] Further, the components of the ionic safety interlayer film for laminated glass include, by weight, 100 parts of metal salts of ethylene methacrylic acid 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.

[0009] Further, the components of the ionic safety interlayer film for laminated glass include, by weight, 100 parts of metal salts of ethylene methacrylic acid copolymer, 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 part of molecular weight regulator.

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

[0011] Further, the initiator is selected from one or both of benzoyl peroxide and 2 - ethylhexyl peroxypivalate.

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

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

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

[0015] Further, the components of the ionic safety interlayer film for laminated glass also include, by weight, 0.1 - 0.8 parts of ultraviolet absorber, 0.1 - 0.8 parts of light stabilizer and 0.01 - 0.8 parts of antioxidant.

[0016] A preparation method of an ionic safety interlayer film for laminated glass, comprising the following steps:

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

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

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

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

[0021] 1. In the formulation system of this technical solution, the metal salt of ethylene methacrylic acid copolymer, coupling agent, initiator, trimethylolpropane trimethacrylate, graft monomer, chain extender, and molecular weight regulator cooperate with each other, enabling the laminated glass interlayer film to have ultra-high strength and excellent adhesion. The tensile strength reaches more than 40 MPa, which is suitable for laminated glass in high-safety facilities;

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

[0023] 3. In the preparation method of the present invention, both the pre-reaction step and the temperature setting of the screw extruder are conducive to obtaining a high-performance interlayer film. Specific Embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

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

[0026] In the formulation system of this technical solution, the graft monomer can increase the molecular chain length after crosslinking, improve the crosslinking density, and enhance the strength performance of the interlayer film; the chain extender increases the chain length after the graft reaction of ethylene methacrylic acid 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 rate and molecular weight distribution of the graft reaction. Therefore, the formulation system of the present invention enables the interlayer film of laminated glass to have ultra-high strength and excellent adhesion, with a tensile strength of over 40 MPa, and is suitable for laminated glass in high-security facilities. Moreover, the cost of ethylene methacrylic acid copolymer metal salt is much lower than that of sarin resin, and the interlayer film of the present invention has a low cost and is more easily widely promoted and applied. Specifically, the ethylene methacrylic acid copolymer metal salt can be selected from sodium salt, zinc salt, or magnesium salt, and in the embodiments of the present invention, the ethylene methacrylic acid copolymer metal salt is preferably zinc salt.

[0027] Specifically, the components of the ionic safety laminated glass interlayer film of the present invention include 100 parts by weight of ethylene methacrylic acid copolymer metal salt, 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. By limiting the amounts of each component in the formulation system, while ensuring the ultra-high tensile strength of the interlayer film, the haze is reduced. If the amounts of the graft monomer, chain extender, and molecular weight regulator are too large, it will result in a high haze of the product and affect the bonding performance of the product.

[0028] The components of the full laminated glass interlayer film include 100 parts by weight of ethylene methacrylic acid 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 amounts of each component in the formulation, the safety laminated glass interlayer film has higher tensile strength and lower haze.

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

[0030] Preferably, the initiator is selected from one or both of benzoyl peroxide and 2-ethylhexyl peroxypivalate. The peroxy group of the initiator splits into free radicals upon heating to initiate the polymerization of monomers. The above two initiators play a very good role in polymerization initiation in the formulation system of the present invention. At the same time, through the polymerization of TMPTMA, the initiator and the coupling agent with the metal salt of ethylene methacrylic acid copolymer, the tensile strength, heat resistance and weather resistance of the intermediate film are improved.

[0031] Preferably, the graft monomer is selected from one or more of 2-phenoxyethyl acrylate (PHEA), ethoxyethoxyethyl acrylate (EOEOEA), glycidyl methacrylate (GMA) and polypropylene glycol diglycidyl ether (PPGDGE). Among them, PHEA can improve the adhesion of the intermediate film to glass and the hardness of the intermediate film, and EOEOEA can improve the adhesion of the intermediate film to glass and the flexibility of the intermediate film. GMA polymerizes by an ionic reaction to improve the tensile strength of the intermediate film; PPGDGE improves the toughness and tensile strength of the intermediate film.

[0032] Preferably, the chain extender is selected from one or both of 1,4-butanediol and 1,6-ethylene glycol. The participation of 1,4-butanediol and 1,6-ethylene glycol in the system reaction is high, and the performance of the intermediate film is significantly improved.

[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 the growing free radicals to monomers or other molecules, thereby controlling the rate and molecular weight distribution of the polymerization reaction, and can effectively regulate the process of the polymerization reaction to ensure that the product has an ideal molecular weight and performance. Tert-dodecyl mercaptan can react with the growing chain free radicals, causing the polymer chain to break during growth, thereby reducing the molecular weight of the polymer and preventing the intermediate film from becoming too hard due to excessive polymerization reaction and reducing the tensile strength.

[0034] In one embodiment of the present invention, the components of the ionic safety interlayer glass intermediate film further include 0.1-0.8 parts by weight of an ultraviolet absorber, 0.1-0.8 parts by weight of a light stabilizer and 0.01-0.8 parts by weight of an antioxidant, so that the intermediate film has the properties of ultraviolet resistance and oxidation resistance and prolongs the service life. Specifically, the ultraviolet absorber is selected from one or both 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] One or two of succinic acid and (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-piperidinyl)imine]-1,6-dihexanediyl[(2,2,6,6-tetramethyl-1-piperidinyl)imine]]]. The antioxidant is 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 ionic safety laminated glass intermediate film, comprising the following steps:

[0037] (1) mixing ethylene methacrylic acid copolymer metal salt, an initiator and a grafting monomer in a high-speed mixer to obtain a first mixed material;

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

[0039] (3) Inputting the second mixed material into a screw extruder to extrude the above-mentioned ionic safety laminated glass intermediate film; wherein the temperature of the screw extruder is set to: 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.

[0040] The preparation method of the present invention achieves the effects of sufficient mixing and sufficient reaction by limiting the mixing order and process temperature, so as to obtain a safety laminated glass intermediate film with ultra-high strength and usable for high-security facilities. In step (1), the ethylene methacrylate copolymer metal salt, the initiator and the grafting monomer are pre-reacted to improve the full polymerization of the grafting monomer and the ethylene methacrylate copolymer metal salt. The screw extruder is designed with eight temperature zones and a gentle temperature difference curve is set, so that the grafting polymerization reaction is sufficient and a glass intermediate film with high tensile strength and appropriate hardness is obtained.

[0041] When the formulation system contains ultraviolet absorbers, light stabilizers and antioxidants, the antioxidant is mixed in step (1) to prevent the product obtained in the pre-reaction process from being denatured and to ensure that the first mixture and other components complete the termination polymerization reaction in the screw extruder. The ultraviolet absorbers and light stabilizers are mixed in step (2).

[0042] The present invention is further described below by way of examples and comparative examples.

[0043] Example 1

[0044] The formula of the ionic safety laminated glass interlayer film of this embodiment is: by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.1 parts of γ-methacryloxypropyltrimethoxysilane, 0.02 parts of dibenzoyl 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 film of this embodiment is prepared by the following steps:

[0046] (1) mixing ethylene methacrylic acid copolymer metal salt, initiator and grafting monomer in a high-speed mixer according to the formula amount to obtain a first mixed material;

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

[0048] (3) Inputting the second mixed material into a screw extruder to extrude the above-mentioned ionic safety laminated glass intermediate film; wherein the temperature of the screw extruder is set to: 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.

[0049] Example 2

[0050] The formula of the ionic safety laminated glass interlayer film of this embodiment is: by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.8 parts of γ-methacryloxypropyltrimethoxysilane, 1.2 parts of dibenzoyl 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 steps for preparing the intermediate film in this embodiment are the same as those in Embodiment 1.

[0052] Example 3

[0053] The formula of the ionic safety laminated glass interlayer film of this embodiment is: by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.1 parts of γ-methacryloxypropyltrimethoxysilane, 0.1 parts of dibenzoyl 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 steps for preparing the intermediate film in this embodiment are the same as those in Embodiment 1.

[0055] Example 4

[0056] The formula of the ionic safety laminated glass interlayer film of this embodiment is: by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.8 parts of γ-methacryloxypropyltrimethoxysilane, 0.4 parts of dibenzoyl 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 steps for preparing the intermediate film in this embodiment are the same as those in Embodiment 1.

[0058] Example 5

[0059] The formula of the ionic safety laminated glass interlayer film of this embodiment is: by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.8 parts of γ-methacryloxypropyltrimethoxysilane, 0.4 parts of dibenzoyl 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 steps for preparing the intermediate film in this embodiment are the same as those in Embodiment 1.

[0061] Example 6

[0062] The formula of the ionic safety laminated glass intermediate film of this embodiment is as follows: in parts by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 0.4 parts of 2-ethylhexyl tert-pentyl 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 steps for preparing the intermediate film in this embodiment are the same as those in Embodiment 1.

[0064] Example 7

[0065] The formula of the ionic safety laminated glass intermediate film of this embodiment is as follows: in parts by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.8 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 0.4 parts of 2-ethylhexyl tert-pentyl 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 steps for preparing the intermediate film in this embodiment are the same as those in Embodiment 1.

[0067] Comparative Example 1

[0068] The formula of the ionic safety laminated glass interlayer of this comparative example is: by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.8 parts of γ-methacryloxypropyltrimethoxysilane, 0.4 parts of dibenzoyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, and 1.5 parts of 2-phenoxyethyl acrylate.

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

[0070] (1) mixing ethylene methacrylic acid copolymer metal salt, initiator and grafting monomer in a high-speed mixer according to the formula amount to obtain a first mixed material;

[0071] (2) mixing the first mixed material, γ-methacryloxypropyl trimethoxysilane and trimethylolpropane trimethacrylate in a high-speed mixer according to the formula amount to obtain a second mixed material;

[0072] (3) Inputting the second mixed material into a screw extruder to extrude the above-mentioned ionic safety laminated glass intermediate film; wherein the temperature of the screw extruder is set to: 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.

[0073] Comparative Example 2

[0074] The formula of the ionic safety laminated glass interlayer film of this embodiment is: by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.8 parts of γ-methacryloxypropyltrimethoxysilane, 0.4 parts of dibenzoyl 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 film of this comparative example was prepared by the following steps:

[0076] (1) mixing ethylene methacrylic acid copolymer metal salt, initiator and grafting monomer in a high-speed mixer according to the formula amount to obtain a first mixed material;

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

[0078] (3) Inputting the second mixed material into a screw extruder to extrude the above-mentioned ionic safety laminated glass intermediate film; wherein the temperature of the screw extruder is set to: 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.

[0079] Comparative Example 3

[0080] The formula 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) mixing ethylene methacrylic acid copolymer metal salt, initiator, grafting monomer, γ-methacryloxypropyl trimethoxysilane, trimethylolpropane trimethacrylate, chain extender and molecular weight regulator in a high-speed mixer according to the formula amount to obtain a mixture;

[0082] (2) Inputting the second mixed material into a screw extruder to extrude the above-mentioned ionic safety laminated glass intermediate film; wherein the temperature of the screw extruder is set to: 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.

[0083] Comparative Example 4

[0084] The formula 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) mixing ethylene methacrylic acid copolymer metal salt, initiator and grafting monomer in a high-speed mixer according to the formula amount to obtain a first mixed material;

[0086] (2) mixing the first mixed material, γ-methacryloxypropyl trimethoxysilane, trimethylolpropane trimethacrylate, a chain extender and a molecular weight regulator in a high-speed mixer according to the formula amount to obtain a second mixed material;

[0087] (3) Inputting the second mixed material into a screw extruder for extrusion to obtain the above-mentioned ionic safety laminated glass intermediate film; wherein the temperature of the screw extruder is set to: 130°C for the first section, 160°C for the second section, 180°C for the third section, 190°C for the fourth section, 200°C for the fifth section, 190°C for the sixth section, 190°C for the seventh section, 175°C for the eighth section, and 170°C for the die head.

[0088] The properties of the intermediate films obtained in Examples 1 to 7 and Comparative Examples 1 to 4 were tested. The tensile strength test and tear strength test were performed on the intermediate film with a thickness of 0.76 mm. The intermediate film with a thickness of 0.76 mm was sandwiched between two pieces of 5 mm thick glass to prepare a laminated glass sample, and the haze test and glass adhesion peel strength test were performed. The test results are shown in the following table.

[0089]

[0090] As can be seen from the above table, the ionic safety interlayer of the present invention has excellent tensile strength, tear strength and adhesion to glass, and low haze. The chain extender and molecular weight regulator significantly improve the tensile strength, tear strength and adhesion to glass of the intermediate film. The premixing step and the extrusion temperature setting in the preparation method of the present invention are conducive to improving the strength performance of the intermediate film.

[0091] Example Group A

[0092] The formula of the ionic safety laminated glass interlayer of this embodiment group is: by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.8 parts of γ-methacryloxypropyl trimethoxysilane, 0.4 parts of dibenzoyl peroxide, 0.8 parts of trimethylolpropane trimethacrylate, 1.5 parts of grafting monomer, 0.6 parts of 1,4-butanediol and 0.8 parts of tert-dodecyl mercaptan. The preparation steps of the interlayer of this embodiment group are the same as those of Example 1.

[0093] The grafting monomer components and usage ratios of this embodiment group are shown in the following table.

[0094]

[0095] The intermediate film of this embodiment group was subjected to tensile strength test, tear strength test and glass bonding peel strength test, and the results are shown in the following table.

[0096]

[0097] It can be seen that the intermediate film obtained by combining 2-phenoxyethyl acrylate and polypropylene glycol diglycidyl ether has higher strength performance.

[0098] Example Group B

[0099] The formula of the ionic safety laminated glass interlayer of this embodiment group is: by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 0.8 parts of γ-methacryloxypropyl trimethoxysilane, 0.4 parts of dibenzoyl 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 of this embodiment group are the same as those of Example 1.

[0100] The molecular weight regulators selected in this example group are shown in the following table.

[0101]

[0102] The intermediate film of this embodiment group was subjected to tensile strength test, tear strength test and glass bonding peel strength test, and the results are shown in the following table.

[0103]

[0104] It can be seen 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 adhesion peel strength.

[0105] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ionic safety laminated glass interlayer, characterized in that: The components include ethylene methacrylic acid copolymer metal salt, coupling agent, initiator, trimethylolpropane trimethacrylate, grafting monomer, chain extender and molecular weight regulator.

2. The ionic safety laminated glass interlayer according to claim 1, characterized in that: The components include, by weight, 100 parts of ethylene methacrylic acid copolymer metal salt, 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 grafting monomer, 0.3-1.8 parts of chain extender and 0.3-2 parts of molecular weight regulator.

3. The ionic safety laminated glass interlayer according to claim 2, characterized in that: The components include, by weight, 100 parts of ethylene methacrylic acid 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 grafting monomer, 0.5-0.8 parts of chain extender and 0.8-1 parts of molecular weight regulator.

4. The ionic safety laminated glass interlayer according to claim 1, 2 or 3, characterized in that: The coupling agent is selected from one or both of γ-methacryloxypropyltrimethoxysilane and γ-(2,3-epoxypropyloxy)propyltrimethoxysilane.

5. The ionic safety laminated glass interlayer according to claim 1, 2 or 3, characterized in that: The initiator is selected from one or both of dibenzoyl peroxide and 2-ethylhexyl tert-pentyl peroxide.

6. The ionic safety laminated glass interlayer according to claim 1, 2 or 3, characterized in that: The grafting monomer is selected from one or more of 2-phenoxyethyl acrylate, ethoxyethoxyethyl acrylate, glycidyl methacrylate and polypropylene glycol diglycidyl ether.

7. The ionic safety laminated glass interlayer according to claim 1, 2 or 3, characterized in that: The chain extender is selected from one or both of 1,4-butanediol and 1,6-ethylene glycol.

8. The ionic safety laminated glass interlayer according to claim 1, 2 or 3, characterized in that: The molecular weight regulator is selected from one or both of tert-dodecyl mercaptan and C12-14 alcohol.

9. The ionic safety laminated glass interlayer according to claim 2 or 3, characterized in that: The components thereof further include 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 by weight.

10. A method for preparing an ionic safety laminated glass interlayer, characterized in that: The following steps are involved: (1) mixing ethylene methacrylic acid copolymer metal salt, an initiator and a grafting monomer in a high-speed mixer to obtain a first mixed material; (2) mixing the first mixed material, a coupling agent, trimethylolpropane trimethacrylate, a chain extender and a molecular weight regulator in a high-speed mixer to obtain a second mixed material; (3) Inputting the second mixed material into a screw extruder for extrusion to obtain the ionic safety laminated glass intermediate film according to any one of claims 1 to 8; wherein the temperature of the screw extruder is set to: 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.

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