Hot melt adhesive for vehicle lamp and preparation method and application thereof

Abstract

The application relates to a hot melt adhesive for vehicle lamps and a preparation method and application thereof, and raw materials for preparing the hot melt adhesive for vehicle lamps include, in parts by weight, 15-40 parts of polyisobutylene, 20-60 parts of amorphous polyolefin, 5-15 parts of silicone modified polyolefin, 0.1-1 part of an antioxidant, 3-30 parts of porous filler and 1-20 parts of carbon black; the silicone modified polyolefin includes silane coupling agent modified polyolefin. The hot melt adhesive for vehicle lamps has an extremely low volatile value, volatile matter < 0.35, effectively avoids the corrosion and optical pollution problems of internal elements of a vehicle lamp caused by the volatilization of organic small molecules of a traditional hot melt adhesive. Meanwhile, the hot melt adhesive for vehicle lamps has good compatibility with an anti-fog coating layer, has a small influence on the anti-fog coating layer, has an anti-fog grade as high as 4-5, can effectively protect the structural integrity of the coating layer, and ensures the stable lighting performance of the vehicle lamp.

Description

Technical Field

[0001] This invention belongs to the field of hot melt adhesive technology, specifically relating to a hot melt adhesive for automotive lights, its preparation method, and its application. Background Technology

[0002] In the automotive lighting manufacturing industry, the bonding and sealing of headlights are extremely critical processes. As a vital guarantee for vehicle driving safety, the quality of the bonding directly affects the performance of headlights in various complex and harsh environments. Ideal headlight bonding should ensure that, under adverse conditions such as extreme temperature, humidity, and vibration, the headlight will not experience problems such as delamination under stress, water or oil seepage, discoloration, or fogging, thus maintaining a stable and reliable lighting effect.

[0003] In traditional automotive headlight bonding processes, hot melt adhesives have become the primary choice due to their advantages such as fast curing speed, good initial tack, and removability. However, traditional hot melt adhesives are mostly composed of polyisobutylene and terpene phenols, resulting in a high volatile content at high temperatures. The large release of volatiles not only significantly affects the anti-fog coating of the headlights, thus compromising its stability and effectiveness, but ultimately severely impairs the driver's visibility, affecting driving safety.

[0004] With the rapid development of the automotive industry and the increasing demands of consumers for driving safety and lighting quality, developing a new type of hot melt adhesive with low volatile content and minimal impact on the anti-fog coating of automotive lights has become a critical issue that urgently needs to be addressed in the field of automotive lighting bonding applications. This will not only help improve the overall performance and reliability of automotive lights, but also further promote the advancement of automotive lighting manufacturing technology and meet the growing market demand. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a hot melt adhesive for automotive lights, its preparation method, and its application.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a hot melt adhesive for automotive lights, wherein, by weight, the raw materials for preparing the hot melt adhesive for automotive lights include:

[0008]

[0009] The organosilicon-modified polyolefins include polyolefins modified with silane coupling agents.

[0010] The hot melt adhesive for automotive lights provided by this invention, through the screening of raw materials, results in an extremely low volatility value, with volatile matter <0.35%, effectively avoiding the corrosion and optical pollution problems of internal automotive light components caused by the volatilization of small organic molecules in traditional hot melt adhesives. Simultaneously, the hot melt adhesive for automotive lights provided by this invention exhibits good compatibility with anti-fog coatings, minimizing its impact and achieving an anti-fog rating of 4-5, effectively protecting the integrity of the coating structure and ensuring stable lighting performance of the automotive lights.

[0011] The polyisobutylene can be in the following weight proportions: 15 parts, 17 parts, 19 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 35 parts, 37 parts, 40 parts, etc.

[0012] The amorphous polyolefin can be in parts by weight of 20, 25, 30, 35, 40, 45, 50, 55, 60, etc.

[0013] The weight parts of the organosilicon-modified polyolefin can be 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, etc.

[0014] The antioxidant can be present in parts by weight of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1 part.

[0015] The weight percentages of the porous filler can be 3, 5, 7, 10, 12, 14, 16, 18, 20, 23, 25, 27, 30, etc.

[0016] The carbon black can be in parts by weight of 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 20, etc.

[0017] Other specific point values ​​within the range of the above values ​​can be selected, and will not be elaborated on here.

[0018] Preferably, the polyisobutylene has a viscosity-average molecular weight of 200,000-4,000,000 (e.g., 200,000, 300,000, 500,000, 700,000, 1,000,000, 1,500,000, 2,000,000, 2,500,000, 3,000,000, 3,500,000, 4,000,000, etc.) and a Stoddinger index of 70-700 cm⁻¹. 3 / g (e.g., 70cm) 3 / g、80cm 3 / g、90cm 3 / g, 100cm 3 / g、200cm3 / g、300cm 3 / g、400cm 3 / g、500cm 3 / g、600cm 3 / g、700cm 3 / g etc.), other specific point values ​​within the above numerical ranges can be selected, which will not be elaborated here.

[0019] In this invention, the polyisobutylene can be purchased, for example, from BASF Oppanol B50, Oppanol B80, Oppanol B100, Oppanol B150, and Oppanol B200.

[0020] Preferably, the amorphous polyolefin comprises an α-olefin polymer.

[0021] Preferably, the α-olefin includes any one or a combination of at least two of ethylene, propylene, 1-butene, isobutene, 1-pentene, 1-hexene, 1-octene, or 4-methyl-1-pentene.

[0022] Preferably, the softening point of the amorphous polyolefin is 80-120℃ (e.g., 80℃, 85℃, 90℃, 95℃, 100℃, 110℃, 120℃, etc.), and the melt viscosity at 190℃ is 2000-20000 mPa·s (e.g., 2000 mPa·s, 4000 mPa·s, 6000 mPa·s, 8000 mPa·s, 10000 mPa·s, 12000 mPa·s, 14000 mPa·s, 16000 mPa·s, 18000 mPa·s, 20000 mPa·s, etc.). Other specific values ​​within the above ranges can be selected, and will not be elaborated here.

[0023] In this invention, the amorphous polyolefin can be purchased, for example, it can be purchased from Evonik Vestoplast 508, Vestoplast 704, or Vestoplast 708.

[0024] Preferably, the organosilicon-modified polyolefin includes any one or a combination of at least two of the following: silane coupling agent-modified polyisobutylene, silane coupling agent-modified amorphous α-polyolefin, or silane coupling agent-modified metallocene-catalyzed vinyl copolymer.

[0025] In this invention, the silane coupling agent modified polyisobutylene can be purchased, for example, from Kaneka Chemical's EPION series; the silane coupling agent modified amorphous α-polyolefin can be purchased, for example, from Evonik's VESTOPLAST 206; and the silane coupling agent modified metallocene-catalyzed vinyl copolymer can be purchased, for example, from Dow Chemical's Si-link series.

[0026] Preferably, the antioxidant includes a primary antioxidant and a secondary antioxidant.

[0027] Preferably, the primary antioxidant includes aromatic amine antioxidants and / or hindered phenolic antioxidants.

[0028] Preferably, the aromatic antioxidant includes any one or a combination of at least two of diaryl secondary amines, p-phenylenediamine, ketamines, or aldehyde amines.

[0029] Preferably, the hindered phenolic antioxidant comprises any one or a combination of at least two of the following: 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] or octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0030] Preferably, the auxiliary antioxidant includes thioester auxiliary antioxidants and / or phosphite auxiliary antioxidants.

[0031] Preferably, the thioester-based auxiliary antioxidant includes dioctadecyl thiodipropionate and / or didodecyl thiodipropionate.

[0032] Preferably, the phosphite-based auxiliary antioxidant includes tris(2,4-di-tert-butylphenyl) phosphite and / or bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite.

[0033] Preferably, the porous packing material comprises a modified molecular sieve.

[0034] Preferably, the molecular sieve pore size is 0.6-1.0 nm, such as 0.6 nm, 0.65 nm, 0.7 nm, 0.75 nm, 0.8 nm, 0.85 nm, 0.9 nm, 0.95 nm, 1.0 nm, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0035] Preferably, the molecular sieve includes X-type molecular sieve and / or Y-type molecular sieve.

[0036] Preferably, the modifier of the modified molecular sieve includes an alkali metal solution.

[0037] Preferably, the alkali metal solution includes sodium hydroxide solution and / or potassium hydroxide solution.

[0038] Preferably, the modified molecular sieve is prepared by the following method:

[0039] The molecular sieve is mixed with an alkali metal solution of 0.2-1 mol / L (e.g., 0.2 mol / L, 0.3 mol / L, 0.4 mol / L, 0.5 mol / L, 0.6 mol / L, 0.7 mol / L, 0.8 mol / L, 0.9 mol / L, 1 mol / L, etc.), heated to 80-100℃ (e.g., 80℃, 82℃, 84℃, 86℃, 88℃, 90℃, 92℃, 94℃, 96℃, 98℃, 100℃, etc.), and stirred for 1-3 h (e.g., 1 h, 1.2 h, 1.4 h, 1.6 h, 1.8 h, 2 h, 2.2 h, 2.4 h, 2.6 h, 2.8 h, 3 h, etc.). Then, it is filtered, washed, and dried to obtain the modified molecular sieve. Other specific values ​​within the above range can be selected, and will not be elaborated here.

[0040] Preferably, the specific surface area of ​​the carbon black is >100 μm. 2 / g (e.g., 110m) 2 / g、115m 2 / g, 120m 2 / g、125m 2 / g, 130m 2 / g、135m 2 / g, 140m 2 / g、145m 2 / g, 150m 2 / g、250m 2 / g, 350m 2 / g, etc.), volatile matter ≤1% (e.g., 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, etc.), other specific point values ​​within the above ranges can be selected, which will not be elaborated here.

[0041] In this invention, the carbon black can be purchased, for example, it can be purchased from Orion PRINTEX L (specific surface area 150 μm). 2 / g, volatile matter 0.8%), PRINTEX 95 (specific surface area 250m) 2 / g, volatile matter 1.0%), HIBLACK 30 (specific surface area 110m) 2 / g, volatile matter 1.0%), PRINTEX 90 (specific surface area 350m)2 / g, volatile matter 1.0%), PRINTEX HV (specific surface area 125m) 2 / g, volatile matter 0.7%).

[0042] Secondly, the present invention provides a method for preparing the hot melt adhesive for automotive lights described in the first aspect, the method comprising the following steps:

[0043] Polyisobutylene, amorphous polyolefin, and antioxidant are blended together, then mixed with porous filler and carbon black, and finally kneaded with organosilicon-modified polyolefin to obtain the hot melt adhesive for automotive lights.

[0044] Preferably, the preparation method is carried out at 120-160℃ (e.g., 120℃, 125℃, 130℃, 135℃, 140℃, 145℃, 150℃, 155℃, 160℃, etc.). Other specific point values ​​within this range can be selected, and will not be described in detail here.

[0045] Preferably, the blending time is 30-130 min, such as 30 min, 40 min, 50 min, 60 min, 70 min, 80 min, 90 min, 100 min, 110 min, 120 min, 130 min, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0046] Preferably, the mixing time is 60-180 min, such as 60 min, 70 min, 80 min, 90 min, 100 min, 110 min, 120 min, 130 min, 140 min, 150 min, 160 min, 170 min, 180 min, etc. Other specific values ​​within this range can be selected, and will not be elaborated here.

[0047] Preferably, the kneading time is 30-90 minutes, such as 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, 60 minutes, 65 minutes, 70 minutes, 75 minutes, 80 minutes, 85 minutes, and 90 minutes. Other specific values ​​within this range can be selected, and will not be elaborated on here.

[0048] Preferably, the preparation method of the hot melt adhesive for vehicle lights includes the following steps:

[0049] At 120℃-160℃, add polyisobutylene, amorphous polyolefin, and antioxidant to a kneader and blend under vacuum for 30-130 minutes; then add modified molecular sieve and carbon black and mix thoroughly under vacuum for 60-180 minutes; finally add organosilicon-modified polyolefin and knead thoroughly under vacuum for 30-90 minutes to obtain hot melt adhesive for automotive lights.

[0050] Thirdly, the present invention provides an application of the hot melt adhesive for automotive lamps as described in the first aspect in automotive lamp bonding.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The hot melt adhesive for automotive lights provided by this invention, through the screening of raw materials, results in an adhesive with extremely low volatility, with volatile matter <0.35%, effectively avoiding the corrosion and optical pollution problems of internal automotive light components caused by the volatilization of small organic molecules in traditional hot melt adhesives. Simultaneously, the hot melt adhesive for automotive lights provided by this invention exhibits good compatibility with anti-fog coatings, minimizing its impact and achieving an anti-fog rating of 4-5, effectively protecting the integrity of the coating structure and ensuring stable lighting performance of the automotive lights. Detailed Implementation

[0053] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0054] Unless otherwise specified, the reagents and consumables used in the following embodiments were purchased from conventional reagent manufacturers in the art; unless otherwise specified, the experimental methods and techniques used were conventional methods and techniques in the art.

[0055] Example 1

[0056] This embodiment provides a hot melt adhesive for automotive lights, and the preparation method is as follows:

[0057] (1) Preparation of modified molecular sieve: 100g of X-type molecular sieve (Jianlong Micro-Nano, 13X raw powder) was mixed with 1000g of 0.5mol / L sodium hydroxide solution, heated to 90℃, stirred for 2h, and then filtered, washed and dried to obtain modified molecular sieve.

[0058] (2) Preparation of hot melt adhesive: Polyisobutylene, amorphous polyolefin, and antioxidant were added sequentially to a kneader at 140℃ and mixed under vacuum for 60 min; then modified molecular sieve and carbon black were added sequentially and kneaded thoroughly under vacuum for 60 min; finally, organosilicon-modified polyolefin was added and kneaded thoroughly under vacuum for 45 min to obtain hot melt adhesive for automotive lights. The amount of each raw material is shown in the table below.

[0059]

[0060]

[0061] Example 2

[0062] This embodiment provides a hot melt adhesive for automotive lights, and the preparation method is as follows:

[0063] (1) Preparation of modified molecular sieve: 100g of Y-type molecular sieve (Jianlong Micro-Nano, NaY molecular sieve) was mixed with 1000g of 0.5mol / L sodium hydroxide solution, heated to 90℃, stirred for 2h, and then filtered, washed and dried to obtain modified molecular sieve.

[0064] (2) Preparation of hot melt adhesive: Polyisobutylene, amorphous polyolefin, and antioxidant were added sequentially to a kneader at 135℃ and mixed under vacuum for 70 min; then modified molecular sieve and carbon black were added sequentially and kneaded thoroughly under vacuum for 70 min; finally, organosilicon-modified polyolefin was added and kneaded thoroughly under vacuum for 50 min to obtain hot melt adhesive for automotive lights. The amount of each raw material is shown in the table below.

[0065]

[0066]

[0067] Example 3

[0068] This embodiment provides a hot melt adhesive for automotive lights, and the preparation method is as follows:

[0069] (1) Preparation of modified molecular sieve: 100g of X-type molecular sieve (Jianlong Micro-Nano, 13X raw powder) was mixed with 1000g of 0.5mol / L sodium hydroxide solution, heated to 90℃, stirred for 2h, and then filtered, washed and dried to obtain modified molecular sieve.

[0070] (2) Preparation of hot melt adhesive: Polyisobutylene, amorphous polyolefin, and antioxidant were added sequentially to a kneader at 140℃ and mixed under vacuum for 45 min; then modified molecular sieve and carbon black were added sequentially and kneaded thoroughly under vacuum for 60 min; finally, organosilicon-modified polyolefin was added and kneaded thoroughly under vacuum for 70 min to obtain hot melt adhesive for automotive lights. The amount of each raw material is shown in the table below.

[0071] Oppanol B100 (polyisobutylene) 35 Amorphous polyolefin Vestoplast 704 45 Organosilicon-modified polyolefin Vestoplast 206 10 Primary antioxidant RIANOX 1076 0.1 RIANOX 168, an auxiliary antioxidant 0.1 Modified molecular sieves 7 PRINTEX HV Carbon Black 4

[0072] Example 4

[0073] This embodiment provides a hot melt adhesive for automotive lights, and the preparation method is as follows:

[0074] (1) Preparation of modified molecular sieve: 100g of X-type molecular sieve (Jianlong Micro-Nano, 13X raw powder) was mixed with 1000g of 0.5mol / L sodium hydroxide solution, heated to 90℃, stirred for 2h, and then filtered, washed and dried to obtain modified molecular sieve.

[0075] (2) Preparation of hot melt adhesive: Polyisobutylene, amorphous polyolefin, and antioxidant were added sequentially to a kneader at 140℃ and mixed under vacuum for 45 min; then modified molecular sieve and carbon black were added sequentially and kneaded thoroughly under vacuum for 60 min; finally, organosilicon-modified polyolefin was added and kneaded thoroughly under vacuum for 70 min to obtain hot melt adhesive for automotive lights. The amount of each raw material is shown in the table below.

[0076] Oppanol B150 (polyisobutylene) 25 Amorphous polyolefin Vestoplast 704 45 Organosilicon-modified polyolefin Vestoplast 206 10 Primary antioxidant RIANOX 1010 0.1 RIANOX 168, an auxiliary antioxidant 0.1 Modified molecular sieves 9 PRINTEX HV Carbon Black 3

[0077] Example 5

[0078] This embodiment provides a hot melt adhesive for automotive lights, and the preparation method is as follows:

[0079] (1) Preparation of modified molecular sieve: 100g of X-type molecular sieve (Jianlong Micro-Nano, 13X raw powder) was mixed with 1000g of 0.4mol / L sodium hydroxide solution, heated to 95℃, stirred for 2h, and then filtered, washed and dried to obtain modified molecular sieve.

[0080] (2) Preparation of hot melt adhesive: At 135°C, polyisobutylene, amorphous polyolefin and antioxidant were added to the kneader in sequence and mixed under vacuum for 100 min; then modified molecular sieve and carbon black were added in sequence and kneaded fully under vacuum for 80 min; finally, organosilicon modified polyolefin was added and kneaded fully under vacuum for 40 min to obtain hot melt adhesive for automotive lights.

[0081] Oppanol B50 (polyisobutylene) 35 Amorphous polyolefin Vestoplast 708 45 Organosilicon-modified polyolefin Vestoplast 206 10 Primary antioxidant RIANOX 1010 0.1 RIANOX DSTP, an auxiliary antioxidant 0.1 Modified molecular sieves 10 PRINTEX HV Carbon Black 5

[0082] Example 6

[0083] This embodiment provides a hot melt adhesive for automotive lights, which differs from Embodiment 1 only in that the same mass of polyisobutylene Oppanol B50 is replaced with polyisobutylene HRD-24 (Shandong Hongrui New Materials, molecular weight 2400), while all other conditions remain unchanged.

[0084] Example 7

[0085] This embodiment provides a hot melt adhesive for automotive lights, which differs from Embodiment 1 only in that the modified molecular sieve is replaced by X molecular sieve (Jianlong Micro-Nano, 13X raw powder) in terms of mass, while all other conditions remain unchanged.

[0086] Example 8

[0087] This embodiment provides a hot melt adhesive for automotive lights, which differs from Embodiment 1 only in that the modified molecular sieve is replaced by calcium carbonate, while all other conditions remain unchanged.

[0088] Comparative Example 1

[0089] This comparative example provides a hot melt adhesive for automotive lights, which differs from Example 1 only in that the silicone-modified polyolefin Vestoplast 206 is replaced by a terpene phenol resin in equal quantities, while all other conditions remain unchanged.

[0090] Comparative Example 2

[0091] This comparative example provides a hot melt adhesive for automotive lights, which differs from Example 1 only in that the silicone-modified polyolefin Vestoplast 206 is replaced by an equal mass of C5 petroleum resin H5-1000, while all other conditions remain unchanged.

[0092] Comparative Example 3

[0093] This comparative example provides a hot melt adhesive for automotive lights, which differs from Example 1 only in that the amorphous polyolefin Vestoplast 508 is replaced by an equal mass of C5 petroleum resin H5-1000, while all other conditions remain unchanged.

[0094] Test Example 1

[0095] This test example examines the performance of the hot melt adhesives for automotive lights prepared in Examples 1-8 and Comparative Examples 1-3. The test methods are as follows:

[0096] Melt viscosity measurement: According to HG / T3660-1999 Determination of melt viscosity of hot melt adhesives, room temperature 190℃.

[0097] Volatile content measurement: According to GB / T 2793-1995 Determination of non-volatile content in adhesives, the experimental temperature is 105±2℃. A sample of 1.0g of hot melt adhesive is cured in an oven for 180±5min, then placed in a desiccator to cool to room temperature, weighed, and the weight loss is calculated. The percentage of weight loss is the percentage of volatile content.

[0098] Evaluation of anti-fog coating: Place 10g of sample into a beaker, then place a lid with a 40mm hole on the beaker, and then place the anti-fog coating sheet on the hole; place the beaker in a 100℃ oil bath and heat for 24h; finally, remove the anti-fog coating sheet, let it stand at room temperature for 30min, and then evaluate the appearance according to Table 1.

[0099] The results are shown in Table 2.

[0100] Table 1

[0101]

[0102]

[0103] Table 2

[0104] Example 1 11.5 0.31 5 Example 2 10.8 0.29 5 Example 3 13.1 0.34 4 Example 4 14.2 0.24 5 Example 5 11.2 0.28 5 Example 6 1.8 2.11 2 Example 7 13.3 0.54 3 Example 8 15.4 0.58 2 Comparative Example 1 6.7 1.13 2 Comparative Example 2 5.8 0.96 2 Comparative Example 3 2.1 1.49 1

[0105] As shown in Table 2, the hot melt adhesives for automotive lights prepared in Examples 1-5 have a melt viscosity of 10.8-14.2 Pa·s, a volatile content of only 0.24%-0.34%, and an anti-fog rating as high as 4-5. The above data indicate that the hot melt adhesives for automotive lights prepared in Examples 1-5 have low volatility and little impact on the anti-fog coating, and can be used for bonding and sealing automotive lights.

[0106] Comparing Example 1 and Example 6, it can be seen that the molecular weight of polyisobutylene has a significant impact on the melt viscosity, volatile matter and anti-fogging level of hot melt adhesive. When the molecular weight of polyisobutylene is too low, the melt viscosity and anti-fogging level of the prepared hot melt adhesive decrease significantly, while the volatile matter increases significantly.

[0107] Comparing Example 1 with Examples 7-8, it can be seen that using modified molecular sieves as porous filler phase can effectively reduce the volatiles of hot melt adhesive and reduce the impact on anti-fog coating.

[0108] Comparing Example 1 with Comparative Examples 1-2, it can be seen that using organosilicon-modified polyolefin as a tackifying resin can effectively increase the melt viscosity of hot melt adhesive, reduce volatile matter, and reduce the impact of hot melt adhesive on anti-fog coating compared to common terpene phenol resins and C5 resins.

[0109] Comparing Example 1 and Comparative Example 3, it can be seen that when the amorphous polyolefin is replaced with C5 resin, the melt viscosity and anti-fogging level of the prepared hot melt adhesive decrease significantly, while the volatile matter increases significantly.

[0110] The applicant declares that the technical solution of this invention is illustrated by the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the products of this invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

[0111] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0112] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A hot melt adhesive for automotive lights, characterized in that, The hot melt adhesive for automotive lights is composed of the following raw materials in parts by weight: 15-40 parts of polyisobutylene; 20-60 parts of amorphous polyolefin; 5-15 parts of organosilicon-modified polyolefin; Antioxidant 0.1-1 part; 3-30 parts of porous packing material; 1-20 parts carbon black; The organosilicon-modified polyolefins include polyolefins modified with silane coupling agents; The polyisobutylene has a viscosity-average molecular weight of 200,000-4,000,000 and a Stodinger index of 70-700 cm⁻¹. 3 / g; The porous packing material includes modified molecular sieves; The modified molecular sieve is prepared by the following method: the molecular sieve is mixed with a 0.2-1 mol / L alkali metal solution, heated to 80-100℃, stirred for 1-3 h, and then filtered, washed and dried to obtain the modified molecular sieve.

2. The hot melt adhesive for automotive lights according to claim 1, characterized in that, The amorphous polyolefins include α-olefin polymers.

3. The hot melt adhesive for automotive lights according to claim 2, characterized in that, The α-olefin includes any one or a combination of at least two of ethylene, propylene, 1-butene, isobutene, 1-pentene, 1-hexene, 1-octene, or 4-methyl-1-pentene.

4. The hot melt adhesive for automotive lights according to claim 1, characterized in that, The softening point of the amorphous polyolefin is 80-120℃, and the melt viscosity at 190℃ is 2000-20000 mPa·s.

5. The hot melt adhesive for automotive lights according to claim 1, characterized in that, The organosilicon-modified polyolefin includes any one or a combination of at least two of the following: silane coupling agent-modified polyisobutylene, silane coupling agent-modified amorphous α-polyolefin, or silane coupling agent-modified metallocene-catalyzed vinyl copolymer.

6. The hot melt adhesive for automotive lights according to claim 1, characterized in that, The antioxidants include primary antioxidants and secondary antioxidants.

7. The hot melt adhesive for automotive lights according to claim 6, characterized in that, The primary antioxidants include aromatic amine antioxidants and / or hindered phenolic antioxidants.

8. The hot melt adhesive for automotive lights according to claim 7, characterized in that, The aromatic amine antioxidants include any one or a combination of at least two of the following: diaryl secondary amines, p-phenylenediamine, ketamines, or aldehyde amines.

9. The hot melt adhesive for automotive lights according to claim 7, characterized in that, The hindered phenolic antioxidants include any one or a combination of at least two of the following: 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] or octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

10. The hot melt adhesive for automotive lights according to claim 6, characterized in that, The auxiliary antioxidants include thioester auxiliary antioxidants and / or phosphite auxiliary antioxidants.

11. The hot melt adhesive for automotive lights according to claim 10, characterized in that, The thioester-based auxiliary antioxidants include dioctadecyl thiodipropionate and / or didodecyl thiodipropionate.

12. The hot melt adhesive for automotive lights according to claim 10, characterized in that, The phosphite-based auxiliary antioxidants include tris(2,4-di-tert-butylphenyl) phosphite and / or bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite.

13. The hot melt adhesive for automotive lights according to claim 1, characterized in that, The molecular sieve has a pore size of 0.6-1.0 nm.

14. The hot melt adhesive for automotive lights according to claim 1, characterized in that, The molecular sieve includes X-type molecular sieves and / or Y-type molecular sieves.

15. The hot melt adhesive for automotive lights according to claim 1, characterized in that, The alkali metal solution includes sodium hydroxide solution and / or potassium hydroxide solution.

16. The hot melt adhesive for automotive lights according to claim 1, characterized in that, The specific surface area of ​​the carbon black is >100 m. 2 / g, volatile matter ≤1%.

17. A method for preparing a hot melt adhesive for automotive lights according to any one of claims 1-16, characterized in that, The preparation method includes the following steps: Polyisobutylene, amorphous polyolefin, and antioxidant are blended together, then mixed with porous filler and carbon black, and finally kneaded with organosilicon-modified polyolefin to obtain the hot melt adhesive for automotive lights.

18. The method for preparing hot melt adhesive for automotive lights according to claim 17, characterized in that, The preparation method is carried out at 120-160℃.

19. The method for preparing hot melt adhesive for automotive lights according to claim 17, characterized in that, The blending time is 30-130 min.

20. The method for preparing hot melt adhesive for automotive lights according to claim 17, characterized in that, The mixing time is 60-180 min.

21. The method for preparing hot melt adhesive for automotive lights according to claim 17, characterized in that, The kneading time is 30-90 minutes.

22. The application of a hot melt adhesive for automotive lamps as described in any one of claims 1-16 in automotive lamp bonding.

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