A yellowing-resistant polyurethane interlayer film for laminated glass and a processing technology thereof

Abstract

The application belongs to the technical field of laminated glass, and particularly relates to a yellowing-resistant polyurethane glass interlayer film for laminated glass and a processing technology thereof. The interlayer film is prepared from raw materials including polyisocyanate, polyester dihydric alcohol, dimethylformamide, polybutylene adipate, hexamethylene diisocyanate, chain extender, light stabilizer, catalyst and curing agent. The curing agent is prepared by the following method: reacting an olefinic halogen-containing compound with a terminal hydrogen-containing silicone oil to obtain modified silicone oil A; reacting the modified silicone oil A with potassium phthalimide, and then performing hydrazinolysis to obtain modified silicone oil B; reacting the modified silicone oil B with dimethyl carbonate to obtain modified silicone oil C; and performing catalytic pyrolysis to obtain the curing agent. The curing agent can improve the yellowing resistance of the polyurethane glass interlayer film. By combining the residual chain extender with the curing agent, the curing agent is better mixed with the polyurethane, so that the mechanical properties of the polyurethane interlayer film are improved, the aging resistance is increased, and the yellowing resistance of the polyurethane interlayer film is further improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of laminated glass, in particular, relates to a yellowing-resistant polyurethane glass interlayer film for laminated glass and a processing technology thereof. BACKGROUND

[0002] Laminated glass is a composite glass product in which two or more pieces of glass are sandwiched by one or more layers of polymer interlayer film, and the glass and the polymer interlayer film are permanently bonded together through a special high-temperature and high-pressure process. It has the excellent properties of high strength, weather resistance of inorganic glass and light weight, impact resistance of organic transparent material. As the most ideal safety glass at present, laminated glass is widely used in the fields of vehicles, buildings and public places. The polymer interlayer film is the most important component that determines the safety performance of laminated glass, and has strict requirements in terms of light transmission performance, adhesion performance to glass, mechanical properties, softness, weather resistance and the like.

[0003] Currently, the laminated glass interlayer film mainly includes three types of polyvinyl butyral (PVB) film, ethylene-vinyl acetate copolymer (EVA) film and ionic interlayer film (SGP film). Among them, the PVB film has high light transmission, adhesion and weather resistance, and also has excellent mechanical properties and impact resistance, and is the most widely used laminated glass interlayer film, accounting for more than 95% of the market share. The EVA film has high light transmission and low price, but its mechanical properties are poor, and the molecule contains an acetic acid group, so it has poor weather resistance and can only be used to make decorative glass and low-grade building safety glass. The SGP film has good light transmission, adhesion and weather resistance, and also has high strength and shear modulus, and is an ideal building safety glass interlayer film, but the production of such a film is difficult and the price is very high.

[0004] Polyurethane resin has the characteristics of high strength, tear resistance, wear resistance, solvent resistance and the like, and the synthesis and application of polyurethane are more and more valued by people, and more and more users use polyurethane between the films of laminated glass. However, most of the existing polyurethane laminated glass films are prepared from diphenylmethane diisocyanate containing benzene ring and polyester or polyether polyol, and in the molecular structure of diphenylmethane diisocyanate, the benzene ring is directly connected with the isocyanate group, and the large pi bond on the benzene ring forms conjugation with the adjacent NCO, so it is easy to absorb ultraviolet rays of 290-400 nm under the environment of light, heat and oxygen, which leads to the chain rupture and crosslinking of polyurethane, not only reduces the mechanical properties, but also causes yellowing of the glass film due to the degradation of the color-forming group, thereby reducing the service life of the polyurethane laminated glass film. SUMMARY

[0005] In view of the above problems existing in the prior art, the purpose of the present application is to provide a yellowing-resistant polyurethane glass interlayer film for laminated glass and a processing technology thereof.

[0006] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0007] A yellowing-resistant polyurethane glass interlayer film for laminated glass comprises the following raw materials by weight:

[0008] 40-60 parts of polyisocyanate, 50-80 parts of polyester diol, 80-120 parts of dimethylformamide, 60-80 parts of polybutylene adipate, 10-16 parts of hexamethylene diisocyanate, 2-5 parts of chain extender, 1-6 parts of light stabilizer, 1-5 parts of catalyst, and 10-15 parts of curing agent.

[0009] The preparation of the curing agent comprises the following steps: reacting an olefinic halogen-containing compound with a terminal hydrogen-containing silicone oil to obtain modified silicone oil A; reacting modified silicone oil A with potassium phthalimide, and then hydrazinolysis to obtain modified silicone oil B; reacting modified silicone oil B with dimethyl carbonate to obtain modified silicone oil C; and obtaining the curing agent through catalytic pyrolysis.

[0010] Alternatively, the yellowing-resistant polyurethane glass interlayer film for laminated glass comprises the following raw materials by weight: 50 parts of polyisocyanate, 65 parts of polyester diol, 100 parts of dimethylformamide, 70 parts of polybutylene adipate, 13 parts of hexamethylene diisocyanate, 3.5 parts of chain extender, 3.5 parts of light stabilizer, 3 parts of catalyst, and 12 parts of curing agent.

[0011] The processing process of the yellowing-resistant polyurethane glass interlayer film for laminated glass comprises the following steps:

[0012] S1: polyisocyanate, polyester diol, dimethylformamide, polybutylene adipate, 1 / 2-2 / 3 of the chain extender and light stabilizer are added to a reaction container, heated and stirred, then hexamethylene diisocyanate and catalyst are added and the reaction is continued to obtain a polyurethane prepolymer;

[0013] S2: the polyurethane prepolymer is mixed uniformly with the curing agent and the remaining chain extender, then poured into a mold, vacuum degassing and drying to obtain the yellowing-resistant polyurethane glass interlayer film.

[0014] Alternatively, the preparation method of the curing agent is as follows:

[0015] The olefinic halogen-containing compound and the terminal hydrogen-containing silicone oil are mixed, chloroplatinic acid is added, and the reaction is carried out at 60-100℃ for 2-4h to obtain modified silicone oil A;

[0016] The potassium phthalimide, modified silicone oil A and anhydrous ethanol are mixed uniformly, the temperature is adjusted to 40-60℃, the reaction is carried out for 2-6h, then hydrazine monohydrate is added, the original temperature is maintained, and the reaction is carried out for 15-30min, and then modified silicone oil B is obtained through separation and drying;

[0017] Mixing the modified silicone oil B, dimethyl carbonate and catalyst 1 uniformly, under the nitrogen environment, at 170-230℃, 1.0-5.3Mpa, for 2-8h, the modified silicone oil C is obtained;

[0018] Mixing the modified silicone oil C and catalyst 2 into the dioctyl phthalate, at 150-300℃, 1-3Mpa, for 3-6h, the curing agent is obtained.

[0019] Optionally, the olefinic halogen-containing compound includes any one of 1,2,3-trichloropropene, 1,4-dichloro-2-butene, 1,4-dibromo-2-butene, 1,6-dibromo-3-hexene; the catalyst 1 is any one of zinc carbonate, zinc oxide, triphenyltin acetate; the catalyst 2 is any one of zinc powder, zinc acetate, aluminum powder, zinc acetate.

[0020] Optionally, the volume ratio of the olefinic halogen-containing compound to the end-hydrogen silicone oil is (0.5-1):1; the mass ratio of the phthalimide potassium, the modified silicone oil A and the monohydrate hydrazine is (0.5-0.8):1:(1.5-2.5); the mass ratio of the modified silicone oil B and the dimethyl carbonate is 1:(8-10); the mass ratio of the modified silicone oil C and the dioctyl phthalate is 1:(15-20).

[0021] Optionally, in S1, the temperature for heating and stirring is 60-80℃, the stirring rate is 500-600r / min, and the stirring time is 30-40min; after adding the hexamethylene diisocyanate and the catalyst in the step one, the stirring is continued for 20-40min.

[0022] Optionally, in S2, the temperature for mixing is 80-90℃, the mixing and stirring rate is 200-300r / min, and after mixing uniformly, pouring is conducted on a high-temperature mold at 100-120℃.

[0023] Optionally, the polyisocyanate is one of toluene diisocyanate, diphenyl methane diisocyanate and polymethylene polyphenyl polyisocyanate; the polyester diol is polypropylene adipate diol or polyethylene terephthalate diol.

[0024] Optionally, the chain extender is any one or two or more of 1,4-butanediol, ethylene glycol, DMPA and DMBA; the light stabilizer is one of a graft copolymer obtained by polymerization of 2,2,6,6-tetramethylpiperidine / α-olefin monomer, 2,2,6,6-tetramethylpiperidine alcohol ester or 3,5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester; and the catalyst is bismuth neodecanoate or zinc neodecanoate.

[0025] Compared with the prior art, the application has the following beneficial effects:

[0026] The present application prepares halogenated modified silicone oil A by the silicon hydrogen addition reaction of olefin halogen-containing compound and end hydrogen-containing silicone oil; then the modified silicone oil A is reacted by Gabriel amine synthesis method to obtain modified silicone oil B with amino group, in the process, in order to avoid the hindering of electron-withdrawing effect of carbonyl and steric hindrance of hydrocarbon group on nucleophilic reaction in the reaction process, hydrazinolysis is further carried out to promote the reaction; finally, the modified silicone oil B is reacted with dimethyl carbonate again, the modified silicone oil contains a large number of amino groups, the amino groups are subjected to methoxycarbonylation reaction with dimethyl carbonate, and then catalytic pyrolysis is carried out, so that isocyanate groups are introduced on the silicone oil chain, and the silicone oil curing agent is obtained; the curing agent can improve the yellowing resistance of the polyurethane glass interlayer film while curing; through the cooperation of the residual chain extender and the curing agent, the curing agent is better mixed with the polyurethane, so that the mechanical properties of the polyurethane interlayer film are improved, the aging resistance is increased, the yellowing resistance of the polyurethane interlayer film is further improved, and the service life of the interlayer film is improved. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] It should be noted that there is no special limitation on the purchase manufacturers of all raw materials involved in the present application, which exemplarily include the following: in the following embodiments, toluene diisocyanate is produced by Nantong Zhonghe New Material Co., Ltd.; polypropylene glycol adipate diol is produced by Nanjing Dongfangzhu Trade Co., Ltd.; diphenyl methane diisocyanate is produced by Wanhua; dimethylformamide is produced by Hubei Dongcao Chemical Technology Co., Ltd., with model number 68-12-2; polybutylene glycol adipate is produced by Guangdong Wengjiang Chemical Reagent Co., Ltd., with product number PC28838; hexamethylene diisocyanate is produced by Shanghai Aladdin Biochemical Technology Co., Ltd., with product number H106723; 1,2,3-trichloropropene has a purity of 99.5% (Tianmen Hengchang Chemical Co., Ltd.); end hydrogen-containing silicone oil has a purity of 99.5%, with CAS number 70900-21-9 and article number 70900-21-9 (Hubei Yongkuo Technology Co., Ltd.); chloroplatinic acid has a purity of 99% (Henan Tianfu Chemical Co., Ltd.); phthalimide potassium has a purity of 98% (Jinan Shengqi Pharmaceutical Technology Co., Ltd.); hydrazine monohydrate has a purity of 99% (Shanghai Dengchi International Trade Co., Ltd.); dimethyl carbonate has a purity of 99% (Henan Tianfu Chemical Co., Ltd.).

[0029] Example 1

[0030] The application provides a yellowing-resistant polyurethane glass interlayer film for laminated glass, which comprises the following raw materials in parts by weight: 50 parts of polyisocyanate, 65 parts of polyester diol, 100 parts of dimethylformamide, 70 parts of polybutylene adipate, 13 parts of hexamethylene diisocyanate, 3.5 parts of chain extender, 3.5 parts of light stabilizer, 3 parts of catalyst and 12 parts of curing agent.

[0031] The curing agent is prepared by the following method: 0.7L of 1,2,3-trichloropropene and 1L of hydrogen-containing end silicone oil are added into a reaction kettle, mechanically stirred and uniformly mixed, 68mg of chloroplatinic acid is added as a catalyst, and the mixture is reacted at 80℃ for 3h to obtain modified silicone oil A.

[0032] Then 28 parts of potassium phthalimide, 40 parts of modified silicone oil A and 800 parts of anhydrous ethanol are added into the reaction kettle, mechanically stirred and uniformly mixed, the temperature is adjusted to 50℃, and the mixture is reacted for 5h, then 80 parts of hydrazine monohydrate is added, the temperature is maintained at 50℃, and the mixture is reacted for 30min, and then the modified silicone oil B is obtained by separation and drying.

[0033] Then 40 parts of modified silicone oil B, 400 parts of dimethyl carbonate and 1.2 parts of nano zinc oxide are added into the reaction kettle, mechanically stirred and uniformly mixed, and the mixture is reacted at 220℃ and 3.8Mpa for 6h in a nitrogen environment to obtain modified silicone oil C.

[0034] 40 parts of modified silicone oil C and 1.2 parts of zinc powder are added into 800 parts of dioctyl phthalate, and the mixture is reacted at 230℃ and 2.3Mpa for 5h to obtain the curing agent.

[0035] The application also provides a processing process of the yellowing-resistant polyurethane glass interlayer film for laminated glass, and the specific preparation steps are as follows:

[0036] S1: polyisocyanate, polyester diol, dimethylformamide, polybutylene adipate, half of the chain extender and light stabilizer are added into a reaction container, stirred at a speed of 600r / min at a temperature of 70℃ for 30min, then hexamethylene diisocyanate and catalyst are added and the mixture is continuously stirred for 30min to obtain a polyurethane prepolymer;

[0037] S2: the polyurethane prepolymer is mixed with the curing agent and the remaining chain extender at a speed of 250r / min at 85℃ for 10min, then poured on a high-temperature mold at 110℃, vacuum degassed and dried to obtain the yellowing-resistant polyurethane glass interlayer film.

[0038] Example 2

[0039] The application provides a yellowing-resistant polyurethane glass interlayer film for laminated glass, which comprises the following raw materials in parts by weight: 40 parts of polyisocyanate, 50 parts of polyester diol, 80 parts of dimethylformamide, 60 parts of polybutylene adipate, 10 parts of hexamethylene diisocyanate, 2 parts of chain extender, 1 part of light stabilizer, 1 part of catalyst and 10 parts of curing agent.

[0040] The curing agent is prepared by the following method: 0.5L of 1,2,3-trichloropropene and 1L of hydrogen-containing end silicone oil are added into a reaction kettle, mechanically stirred and uniformly mixed, 60mg of chloroplatinic acid is added as a catalyst, and the mixture is reacted at 80℃ for 3h to obtain modified silicone oil A.

[0041] Then 20 parts of potassium phthalimide, 40 parts of modified silicone oil A and 800 parts of anhydrous ethanol are added into the reaction kettle, mechanically stirred and uniformly mixed, the temperature is adjusted to 50℃, and the mixture is reacted for 5h, then 80 parts of hydrazine monohydrate is added, the temperature is maintained at 50℃, and the mixture is reacted for 30min, and then the modified silicone oil B is obtained by separation and drying.

[0042] Then 40 parts of modified silicone oil B, 320 parts of dimethyl carbonate and 1.2 parts of nano zinc oxide are added into the reaction kettle, mechanically stirred and uniformly mixed, and the mixture is reacted at 220℃ and 3.8Mpa for 6h in a nitrogen environment to obtain modified silicone oil C.

[0043] 40 parts of modified silicone oil C and 1.2 parts of zinc powder are added into 800 parts of dioctyl phthalate, and the mixture is reacted at 230℃ and 2.3Mpa for 5h to obtain the curing agent.

[0044] The application also provides a processing process of the yellowing-resistant polyurethane glass interlayer film for laminated glass.

[0045] S1: polyisocyanate, polyester diol, dimethylformamide, polybutylene adipate, half of the chain extender and light stabilizer are added into a reaction container, stirred at a speed of 500r / min at a temperature of 60℃ for 40min, then hexamethylene diisocyanate and catalyst are added and the mixture is continuously stirred for 40min to obtain a polyurethane prepolymer;

[0046] S2: the polyurethane prepolymer, the curing agent and the remaining chain extender are mixed by stirring at a speed of 200r / min at a temperature of 90℃ for 5min, then poured on a high-temperature mold at 100℃, vacuum degassed and dried to obtain the yellowing-resistant polyurethane glass interlayer film.

[0047] Example 3

[0048] The application provides a yellowing-resistant polyurethane glass interlayer film for laminated glass, which comprises the following raw materials in parts by weight: 60 parts of polyisocyanate, 80 parts of polyester diol, 120 parts of dimethylformamide, 80 parts of polybutylene adipate, 16 parts of hexamethylene diisocyanate, 5 parts of chain extender, 6 parts of light stabilizer, 5 parts of catalyst and 15 parts of curing agent.

[0049] The curing agent is prepared by the following method: 1L of 1,4-dichloro-2-butene and 1L of hydrogen-containing silicone oil are added into a reaction kettle, mechanically stirred and uniformly mixed, 80mg of chloroplatinic acid is added as a catalyst, and the mixture is reacted at 80 DEG C for 3h to obtain modified silicone oil A;

[0050] Then, 32 parts of potassium phthalimide, 40 parts of modified silicone oil A and 800 parts of anhydrous ethanol are added into the reaction kettle, mechanically stirred and uniformly mixed, the temperature is adjusted to 50 DEG C, and the mixture is reacted for 5h, then 80 parts of hydrazine monohydrate is added, the temperature is maintained at 50 DEG C, and the mixture is reacted for 30min, and then the modified silicone oil B is obtained by separation and drying;

[0051] Then, 40 parts of modified silicone oil B, 400 parts of dimethyl carbonate and 1.2 parts of nano zinc oxide are added into the reaction kettle, mechanically stirred and uniformly mixed, and the mixture is reacted at 220 DEG C under a nitrogen atmosphere and at a pressure of 3.8Mpa for 6h to obtain the modified silicone oil C;

[0052] 40 parts of modified silicone oil C and 1.2 parts of zinc powder are added into 700 parts of dioctyl phthalate, and the mixture is reacted at 230 DEG C under a pressure of 2.3Mpa for 5h to obtain the curing agent.

[0053] The application also provides a processing process of the yellowing-resistant polyurethane glass interlayer film for laminated glass.

[0054] S1: the polyisocyanate, polyester diol, dimethylformamide, polybutylene adipate, 3 / 5 of the chain extender and light stabilizer are added into a reaction container, stirred at a speed of 550r / min at a temperature of 60 DEG C for 40min, then the hexamethylene diisocyanate and catalyst are added and the mixture is continuously stirred for 20min to obtain a polyurethane prepolymer;

[0055] S2: the polyurethane prepolymer, curing agent and the remaining chain extender are mixed by stirring at a speed of 200r / min at a temperature of 85 DEG C for 10min, then the mixture is poured on a high-temperature mold at 110 DEG C, vacuum degassed and dried to obtain the yellowing-resistant polyurethane glass interlayer film.

[0056] Example 4

[0057] The application provides a yellowing-resistant polyurethane glass interlayer film for laminated glass, which comprises the following raw materials in parts by weight: 55 parts of polyisocyanate, 60 parts of polyester diol, 100 parts of dimethylformamide, 80 parts of polybutylene adipate, 10 parts of hexamethylene diisocyanate, 3 parts of chain extender, 4 parts of light stabilizer, 3 parts of catalyst and 11 parts of curing agent.

[0058] The curing agent is prepared by the following method: 0.7L of 1,4-dibromo-2-butene and 1L of hydrogen-terminated silicone oil are added into a reaction kettle, mechanically stirred and uniformly mixed, 68mg of chloroplatinic acid is added as a catalyst, and the reaction is carried out at 60℃ for 4h to obtain modified silicone oil A;

[0059] Then 28 parts of potassium phthalimide, 40 parts of modified silicone oil A and 800 parts of anhydrous ethanol are added into the reaction kettle, mechanically stirred and uniformly mixed, the temperature is adjusted to 60℃, and the reaction is carried out for 2h, then 100 parts of hydrazine monohydrate is added, the temperature is maintained at about 60℃, and the reaction is carried out for 30min, and then the modified silicone oil B is obtained by separation and drying;

[0060] Then 40 parts of modified silicone oil B, 400 parts of dimethyl carbonate and 1.2 parts of tin phenylacetate are added into the reaction kettle, mechanically stirred and uniformly mixed, the reaction is carried out at 230℃ and 1.5Mpa for 8h in a nitrogen environment to obtain modified silicone oil C;

[0061] 40 parts of modified silicone oil C and 1.2 parts of aluminum powder are added into 750 parts of dioctyl phthalate, and the reaction is carried out at 290℃ and 1.4Mpa for 3h to obtain the curing agent.

[0062] The application also provides a processing process of the yellowing-resistant polyurethane glass interlayer film for laminated glass.

[0063] S1: the polyisocyanate, polyester diol, dimethylformamide, polybutylene adipate, 2 / 3 of the chain extender and light stabilizer are added into a reaction container, stirred at a speed of 500r / min at a temperature of 70℃ for 40min, then the hexamethylene diisocyanate and catalyst are added and the stirring is continued for 40min to obtain a polyurethane prepolymer;

[0064] S2: the polyurethane prepolymer, curing agent and the remaining chain extender are mixed by stirring at a speed of 300r / min at 80℃ for 8min, then poured on a high-temperature mold at 120℃, vacuum degassing and drying to obtain the yellowing-resistant polyurethane glass interlayer film.

[0065] Comparative Example 1 (using conventional curing agent - hexamethylene diisocyanate)

[0066] The difference between this comparative example and Example 1 is that the curing agent is replaced with the same mass of hexamethylene diisocyanate.

[0067] Comparative Example 2 (all of the chain extender added in the first step)

[0068] The difference between this comparative example and Example 1 is that:

[0069] A processing process for a yellowing-resistant polyurethane glass interlayer film for laminated glass, the specific preparation steps are as follows:

[0070] S1: The polyisocyanate, polyester diol, dimethylformamide, polybutylene adipate, chain extender and light stabilizer are added to the reaction container, stirred at a speed of 600 r / min for 30 min at a temperature of 70°C, then hexamethylene diisocyanate and catalyst are added and continue to stir for 30 min to obtain a polyurethane prepolymer;

[0071] S2: The polyurethane prepolymer and curing agent are mixed at a speed of 250 r / min for 10 min at 85°C, then poured on a high-temperature mold at 110°C, vacuum degassed and dried to obtain a yellowing-resistant polyurethane glass interlayer film.

[0072] Comparative Example 3 (1 / 4 of the chain extender added in the first step, and 3 / 4 added in the second step)

[0073] The difference between this comparative example and Example 1 is that:

[0074] A processing process for a yellowing-resistant polyurethane glass interlayer film for laminated glass, the specific preparation steps are as follows:

[0075] S1: The polyisocyanate, polyester diol, dimethylformamide, polybutylene adipate, 1 / 4 of the chain extender and light stabilizer are added to the reaction container, stirred at a speed of 600 r / min for 30 min at a temperature of 70°C, then hexamethylene diisocyanate and catalyst are added and continue to stir for 30 min to obtain a polyurethane prepolymer;

[0076] S2: The polyurethane prepolymer and curing agent are mixed at a speed of 250 r / min for 10 min at 85°C, then poured on a high-temperature mold at 110°C, vacuum degassed and dried to obtain a yellowing-resistant polyurethane glass interlayer film.

[0077] The polyurethane glass interlayer films obtained in Examples 1-4 and Comparative Examples 1-3 are respectively tested for mechanical properties and yellowing resistance, and the test results are shown in Table 1.

[0078] Using QUV test box, power and wavelength are 0.75w, 313nm, temperature and humidity and time of test are 60℃, 90%, 2400h respectively, then carry out yellowing resistance and anti-phenol yellowing grade test;

[0079] According to GB / T2567-2008 standard, tensile strength and elongation at break test are carried out.

[0080] Table 1 test result statistics

[0081]

[0082] From table 1, polyurethane glass interlayer film produced by using the application examples 1-4 has good mechanical properties and aging resistance, yellowing resistance. When the comparative example 1 uses conventional curing agent instead of the curing agent of the application, the mechanical properties and yellowing resistance of the produced polyurethane glass interlayer film are reduced compared with the example 1, and the mechanical properties and yellowing resistance of the application examples are higher than those of the comparative examples 2 and 3. It shows that the curing agent prepared by the application has excellent curing effect on polyurethane prepolymer, and can significantly improve the yellowing resistance and mechanical properties of the interlayer film; and according to the process of the application, appropriate amount of residual chain extender cooperates with the curing agent, so that the mechanical properties of the polyurethane interlayer film are improved, the aging resistance is increased, the yellowing resistance of the polyurethane interlayer film is further improved, and the service life of the laminated glass film is improved.

[0083] Finally: the above only for the preferred embodiments of the application, and not for limiting the application, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application, should be included in the protection scope of the application.

Claims

1. A yellowing-resistant polyurethane interlayer film for laminated glass, characterized by: The raw materials include the following weight parts: Polyisocyanate 40-60 parts, polyester diol 50-80 parts, dimethylformamide 80-120 parts, polybutylene adipate 60-80 parts, hexamethylene diisocyanate 10-16 parts, chain extender 2-5 parts, light stabilizer 1-6 parts, catalyst 1-5 parts, curing agent 10-15 parts; The preparation of the curing agent includes the following steps: reacting an olefin halogen-containing compound with a terminal hydrogen-containing silicone oil to obtain modified silicone oil A; reacting modified silicone oil A with potassium phthalimide, and then hydrazinolysis to obtain modified silicone oil B; reacting modified silicone oil B with dimethyl carbonate to obtain modified silicone oil C; and introducing isocyanate groups on the silicone oil chain through catalytic pyrolysis to obtain a silicone oil curing agent; The processing process of the yellowing-resistant polyurethane glass interlayer film for laminated glass includes the following steps: S1: polyisocyanate, polyester diol, dimethylformamide, polybutylene adipate, 1 / 2~2 / 3 of the chain extender and light stabilizer are added to a reaction container, heated and stirred, then hexamethylene diisocyanate and catalyst are added and continue to be stirred to obtain a polyurethane prepolymer; S2: the polyurethane prepolymer is mixed uniformly with the curing agent and the remaining chain extender, then poured into a mold, vacuum degassed and dried to obtain a yellowing-resistant polyurethane glass interlayer film; The preparation method of the curing agent is as follows: The olefin halogen-containing compound and the terminal hydrogen-containing silicone oil are mixed, chloroplatinic acid is added, and the mixture is reacted at 60~100℃ for 2~4h to obtain modified silicone oil A; Potassium phthalimide, modified silicone oil A and anhydrous ethanol are mixed uniformly, the temperature is adjusted to 40~60℃, and the mixture is reacted for 2~6h, then hydrazine monohydrate is added, the temperature is maintained, and the mixture is reacted for 15~30min, then separated and dried to obtain modified silicone oil B; Modified silicone oil B, dimethyl carbonate and catalyst 1 are mixed uniformly, and the mixture is reacted at 170~230℃ and 1.0~5.3Mpa for 2~8h under nitrogen atmosphere to obtain modified silicone oil C; Modified silicone oil C and catalyst 2 are added to dioctyl phthalate, and the mixture is reacted at 150~300℃ and 1~3Mpa for 3~6h to obtain the curing agent; The polyisocyanate is one of toluene diisocyanate, diphenylmethane diisocyanate and polymethylene polyphenyl polyisocyanate, and the polyester diol is polypropylene adipate diol or polyethylene terephthalate diol.

2. The anti-yellowing polyurethane interlayer film for laminated glass according to claim 1, characterized in that: The raw materials include the following weight parts: polyisocyanate 50 parts, polyester diol 65 parts, dimethylformamide 100 parts, polybutylene adipate 70 parts, hexamethylene diisocyanate 13 parts, chain extender 3.5 parts, light stabilizer 3.5 parts, catalyst 3 parts and curing agent 12 parts.

3. The anti-yellowing polyurethane interlayer film for laminated glass according to claim 1, characterized by, The olefin halogen-containing compound includes any one of 1,2,3-trichloropropene, 1,4-dichloro-2-butene, 1,4-dibromo-2-butene and 1,6-dibromo-3-hexene; the catalyst 1 is any one of zinc carbonate, zinc oxide and triphenyltin acetate; and the catalyst 2 is any one of zinc powder, zinc acetate and aluminum powder.

4. The anti-yellowing polyurethane interlayer film for laminated glass according to claim 3, characterized by The volume ratio of the olefin halide compound to the end hydrogen-containing silicone oil is (0.5-1):1; the mass ratio of the phthalimide potassium, the modified silicone oil A, and the monohydrate hydrazine is (0.5-0.8):1:(1.5-2.5); the mass ratio of the modified silicone oil B to the dimethyl carbonate is 1:(8-10); and the mass ratio of the modified silicone oil C to the dioctyl phthalate is 1:(15-20).

5. The anti-yellowing polyurethane interlayer film for laminated glass according to claim 1, characterized by, The temperature during the heating and stirring in S1 is 60-80 DEG C, the stirring rate is 500-600 r / min, and the stirring time is 30-40 min; after the addition of the hexamethylene diisocyanate and the catalyst in S1, the stirring is continued for 20-40 min.

6. The anti-yellowing polyurethane interlayer film for laminated glass according to claim 1, characterized by, The temperature during mixing in S2 is 80-90℃, the mixing stirring rate is 200-300r / min, and after mixing uniformly, pouring is conducted on a 100 120℃ high temperature mold.

7. The anti-yellowing polyurethane interlayer film for laminated glass according to claim 1, characterized by, The chain extender is any one or two or more of 1,4-butanediol, ethylene glycol, DMPA, and DMBA; the light stabilizer is one of a graft copolymer of 2,2,6,6-tetramethylpiperidine / alpha-olefin monomer, 2,2,6,6-tetramethylpiperidine alcohol ester, and 3,5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester; and the catalyst is bismuth neodecanoate or zinc neodecanoate.

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