CN117701204A - Hot melt adhesive for sealing car lamp and preparation method thereof - Google Patents
Hot melt adhesive for sealing car lamp and preparation method thereof Download PDFInfo
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- CN117701204A CN117701204A CN202311716845.6A CN202311716845A CN117701204A CN 117701204 A CN117701204 A CN 117701204A CN 202311716845 A CN202311716845 A CN 202311716845A CN 117701204 A CN117701204 A CN 117701204A
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- 239000004831 Hot glue Substances 0.000 title claims abstract description 51
- 238000007789 sealing Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title description 19
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- 239000004743 Polypropylene Substances 0.000 claims abstract description 23
- 229920000098 polyolefin Polymers 0.000 claims abstract description 22
- -1 polypropylene Polymers 0.000 claims abstract description 22
- 229920001155 polypropylene Polymers 0.000 claims abstract description 22
- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims description 33
- 238000003756 stirring Methods 0.000 claims description 30
- 238000002844 melting Methods 0.000 claims description 16
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- 238000010438 heat treatment Methods 0.000 claims description 15
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical compound C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 claims description 13
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- 239000002994 raw material Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
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- 238000001125 extrusion Methods 0.000 claims description 5
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- 241000258971 Brachiopoda Species 0.000 abstract description 7
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- 239000000853 adhesive Substances 0.000 description 17
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- 230000000052 comparative effect Effects 0.000 description 12
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- IRIAEXORFWYRCZ-UHFFFAOYSA-N Butylbenzyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCC1=CC=CC=C1 IRIAEXORFWYRCZ-UHFFFAOYSA-N 0.000 description 4
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 4
- MGWAVDBGNNKXQV-UHFFFAOYSA-N diisobutyl phthalate Chemical compound CC(C)COC(=O)C1=CC=CC=C1C(=O)OCC(C)C MGWAVDBGNNKXQV-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
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- 238000000889 atomisation Methods 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a hot melt adhesive for sealing car lamps, which is characterized by comprising, by mass, 10-30 parts of a styrene thermoplastic elastomer, 5-15 parts of metallocene polypropylene, 10-30 parts of random polyolefin, 30-40 parts of petroleum resin, 15-25 parts of rosin resin, 5-15 parts of polyisobutylene and 0.1-1 part of an antioxidant. The hot melt adhesive provided by the invention has good spreadability and initial adhesion strength, can be quickly cooled and condensed after being attached to the lamp shell of the car lamp, and can be used for bonding and fixing the lamp shell of the car lamp and has higher strength.
Description
Technical Field
The invention belongs to the field of hot melt adhesive preparation, and particularly relates to a hot melt adhesive for sealing car lamps and a preparation method thereof.
Background
The hot melt adhesive is a solvent-free thermoplastic adhesive prepared by taking thermoplastic polymers as a base material, taking a tackifier, a viscosity regulator, a plasticizer, an antioxidant and a filler as modification aids and carrying out melt blending. The hot melt adhesive is high-elasticity solid with 100% solid content at room temperature, and is heated and melted to a low-viscosity viscous state when in use, and is uniformly coated on the bonding interface of an adherend, and after the hot melt adhesive is cooled and solidified, the Van der Waals force of the bonding interface and the cohesive force of the hot melt adhesive are tightly adhered to the adherend. Compared with the traditional inorganic adhesive and solvent adhesive, the hot melt adhesive has the advantages of water resistance, no adhesive opening, high curing speed, multiple bonding, easy processing, recoverability, high automation degree, low cost and the like, and has wide application prospect.
In the process of manufacturing and assembling the automobile lamp, the structure of the automobile lamp is shown in the attached figure 1 (a lens 1, a bulb 2, a reflector 3, a lamp housing 4 and an adhesive 5), the lens is inserted into the lamp housing of the automobile lamp, and the lens (glass or PC) and the lamp housing (PP, PBT, ABS and other materials) are tightly connected and must be bonded and sealed by using the adhesive. The use of the adhesive has higher requirements, firstly, the high temperature resistance is needed, when the automobile runs for a long time when the automobile is started, the temperature in the automobile lamp can reach 70-160 ℃, the adhesive can be influenced by the heat emitted by the bulb, so that the adhesive is ensured not to change the bonding and sealing performance at the high temperature, and the organic gas can not be released, and the atomization phenomenon is generated; secondly, the lamp shell of the car lamp is exposed to sunlight for a long time, and aging phenomena such as cracking of a glue layer and the like cannot occur after the car lamp is used for a long time; finally, the adhesive is subjected to long-time corrosion of water vapor and rainwater in the atmosphere, and the bonding sealing performance of the adhesive is not affected.
The polyurethane hot melt adhesive (PUR) is commonly used for sealing the car lamp shell at present, and is prepared by matching a single-component solvent-free isocyanate-terminated prepolymer with a corresponding auxiliary agent, wherein the main component of the polyurethane hot melt adhesive is the isocyanate-terminated prepolymer synthesized by polyol and diisocyanate, and the PUR has better initial adhesion strength and curing time, but the PUR adhesive has high production cost and high selling price, so that the car lamp assembly cost becomes high; polyurethane AB glue, also called as two-liquid mixed hardening glue, one liquid is the glue, and one liquid is the hardener, and two liquid mixtures can harden, do not need to harden by temperature and ripen, but AB glue's operation is complicated, need to allocate two liquids and just can use, and need wait to wait for the gluing agent to harden just can remove the work piece, production efficiency is lower.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a hot melt adhesive for sealing a lamp housing of a car lamp and a preparation method thereof.
The invention provides a hot melt adhesive for sealing car lamps, which comprises, by mass, 10-30 parts of a styrene thermoplastic elastomer, 5-15 parts of metallocene polypropylene, 10-30 parts of random polyolefin, 30-40 parts of petroleum resin, 15-25 parts of rosin resin, 5-15 parts of polyisobutylene and 0.1-1 part of an antioxidant.
Preferably, the styrenic thermoplastic elastomer is a polystyrene-isoprene-styrene resin, and the diblock content of the styrenic thermoplastic elastomer is 10% -50%.
Preferably, the diblock content of the styrenic thermoplastic elastomer is 20% to 40%.
Preferably, the thermoplastic elastomer comprises 15-25 parts of styrene thermoplastic elastomer, 5-10 parts of metallocene catalyzed polypropylene, 10-20 parts of random polyolefin, 30-40 parts of petroleum resin, 15-25 parts of rosin resin, 5-15 parts of polyisobutene and 0.1-1 part of antioxidant.
Preferably, the composition further comprises terpene phenol resin, wherein the terpene phenol resin is 5-10 parts by weight.
Preferably, the petroleum resin is one or more of a C5 petroleum resin, a C9 petroleum resin, or a C5/C9 copolymerized petroleum resin.
Preferably, the antioxidant is an aromatic amine antioxidant.
Preferably, 10-20 parts of styrene-butadiene-styrene resin is also included.
The invention also provides a preparation method of the hot melt adhesive for sealing the car lamp, which comprises the following steps:
step 1: preheating a reaction kettle;
step 2: adding polyisobutene into the reaction kettle, heating the reaction kettle to 180 ℃ and keeping stirring at a stirring speed of 20-50r/min until the polyisobutene is completely melted, and keeping the constant temperature of 180 ℃;
step 3: sequentially adding metallocene polypropylene and random polyolefin from low to high according to the viscosity of the raw materials, melting one by one, maintaining the stirring speed at 20-50r/min, completely melting the raw materials, and keeping the constant temperature at 180 ℃;
step 4: heating and melting the styrene thermoplastic elastomer outside the reaction kettle, introducing the melted styrene thermoplastic elastomer into the reaction kettle, maintaining the stirring speed at 20-40r/min, and keeping the constant temperature at 180 ℃;
step 5: sequentially adding petroleum resin, rosin resin and antioxidant, maintaining stirring speed at 10-30r/min, stirring uniformly, and introducing into a discharge port for extrusion molding.
Preferably, when the styrene-butadiene-styrene resin is added, the styrene-butadiene-styrene resin and the styrenic thermoplastic elastomer are melted by heating outside the reaction vessel, and the melted mixture is introduced into the reaction vessel.
The polyisobutene is used as a viscosity and opening time regulator, and has good fluidity and dispersibility; the metallocene polypropylene has good elasticity and low temperature resistance; the random polyolefin has good surface wetting and spreading performance, and has better compatibility with petroleum resin, and the petroleum resin and rosin resin are used as adhesion promoters, so that the adhesiveness of the product and the compatibility of the elastomer are effectively improved; the small amount of antioxidant can relieve the aging of the material in the heating process and improve the service life of the finished product in daily use.
Compared with the prior art, the hot melt adhesive provided by the invention has the following beneficial effects:
1. the hot melt adhesive provided by the invention has good spreadability and initial adhesion strength, can be quickly cooled and condensed after being attached to the lamp shell of the car lamp, and can be used for bonding and fixing the lamp shell of the car lamp and has higher strength;
2. the preparation method and the use method of the hot melt adhesive are simple, the production efficiency and the use efficiency are high, and the hot melt adhesive can be adhered and shaped in a short time when in use, so that the low cost is realized;
3. the hot melt adhesive provided by the invention has better high temperature resistance, solvent resistance and water resistance, and longer service life, and in addition, the hot melt adhesive also has the product heating repairable performance, and can realize recovery or maintenance through high-temperature heating and melting, so that the loss is reduced.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intentionally drawn to scale on actual size or the like, with emphasis on illustrating the principles of the invention.
Fig. 1 is a schematic view of a sealing structure of a vehicle lamp in the prior art.
Detailed Description
The following is a further detailed description of the present invention in conjunction with specific embodiments, so that those skilled in the art may better understand and practice the present invention, but the examples are not intended to limit the present invention.
The embodiment of the invention provides a hot melt adhesive for sealing car lamps, which comprises, by mass, 10-30 parts of a styrene thermoplastic elastomer, 5-15 parts of metallocene polypropylene, 10-30 parts of random polyolefin, 30-40 parts of petroleum resin, 15-25 parts of rosin resin, 5-15 parts of polyisobutylene and 0.1-1 part of an antioxidant.
Further, the styrene thermoplastic elastomer is a polystyrene-isoprene-styrene resin (SIS resin), and the diblock content of the styrene thermoplastic elastomer is 10% -50%. Diblock content refers to the proportion of the total mass of the copolymer in which the two-terminal polymer, composed of the same monomer, is present in a certain block copolymer. The diblock content of the block copolymer has important effects on the thermal stability, mechanical properties, physicochemical properties and the like of the polymer. In the block copolymer, the number ratio of block units composed of different monomers can be divided into different mechanism types, and the configuration of the ABA front end copolymer is exemplified by polystyrene-isoprene-styrene resin, wherein A represents block 1, B represents block 2, namely, the two ends connected with each other are the same monomer units, and the middle monomer unit is different monomer units.
In a preferred embodiment, the diblock content of the styrenic thermoplastic elastomer is from 20% to 40%.
In a preferred embodiment, the thermoplastic elastomer comprises 15-25 parts of a styrenic thermoplastic elastomer, 5-10 parts of metallocene catalyzed polypropylene, 10-20 parts of random polyolefin, 30-40 parts of petroleum resin, 15-25 parts of rosin resin, 5-15 parts of polyisobutylene and 0.1-1 part of an antioxidant.
In a preferred embodiment, the composition further comprises 5-10 parts by weight of terpene phenol resin. The terpene-phenol resin is a resin formed by polymerizing terpene resin and phenol, has good polarity, can be fused with most film forming substances, and can improve the ductility and the flexibility of the adhesive in this way, thereby improving the quality of the adhesive.
In this embodiment, the petroleum resin is one or more of a C5 petroleum resin, a C9 petroleum resin, or a C5/C9 copolymer petroleum resin. The petroleum resin and the rosin resin are added into the formula as tackifying resins, and the petroleum resin and the rosin resin can improve the wettability of the hot melt adhesive to the base material, so that the hot melt adhesive is fully contacted and bonded with the lamp shell of the car lamp and the lens, thereby improving the bonding strength, improving the impact resistance and the peeling strength of the adhesive, prolonging the service life and reducing the creep; and petroleum resin and rosin resin can endow the hot melt adhesive with better initial viscosity.
In this embodiment, the antioxidant is an aromatic amine antioxidant. The aromatic amine antioxidant participates in the oxidation reaction by providing hydrogen atoms in the reaction process, generates intermediates and further performs coupling reaction to remove free radicals in the reaction process.
In a preferred embodiment, 10-20 parts of styrene-butadiene-styrene resin (SBS resin) is also included. The diblock content of the SBS resin is 15 to 20 percent
The embodiment of the invention also provides a preparation method of the hot melt adhesive for sealing the car lamp, which comprises the following steps:
step 1: preheating a reaction kettle;
step 2: adding polyisobutene into the reaction kettle, heating the reaction kettle to 180 ℃ and keeping stirring at a stirring speed of 20-50r/min until the polyisobutene is completely melted, and keeping the constant temperature of 180 ℃;
step 3: sequentially adding metallocene polypropylene and random polyolefin from low to high according to the viscosity of the raw materials, melting one by one, maintaining the stirring speed at 20-50r/min, completely melting the raw materials, and keeping the constant temperature at 180 ℃;
step 4: heating and melting the styrene thermoplastic elastomer outside the reaction kettle, introducing the melted styrene thermoplastic elastomer into the reaction kettle, maintaining the stirring speed at 20-40r/min, and keeping the constant temperature at 180 ℃;
step 5: sequentially adding petroleum resin, rosin resin and antioxidant, maintaining stirring speed at 10-30r/min, stirring uniformly, and introducing into a discharge port for extrusion molding.
Further, when the styrene-butadiene-styrene resin is added, the styrene-butadiene-styrene resin and the styrenic thermoplastic elastomer are heated and melted outside the reaction vessel, and the melted mixture is introduced into the reaction vessel.
Specific examples and comparative examples are described in detail below.
Example 1
The weight portions of the composition are 10 portions of polystyrene-isoprene-styrene resin, 5 portions of metallocene polypropylene, 10 portions of random polyolefin, 30 portions of petroleum resin, 15 portions of rosin resin, 5 portions of polyisobutylene and 0.5 portion of antioxidant, wherein the diblock content of the polystyrene-isoprene-styrene resin is 10 percent.
The preparation method comprises the following steps:
step 1: preheating a reaction kettle;
step 2: adding polyisobutene into a reaction kettle, heating the reaction kettle to 180 ℃ and keeping stirring at a stirring speed of 30r/min until the polyisobutene is completely melted, and keeping the constant temperature of 180 ℃;
step 3: sequentially adding metallocene polypropylene and random polyolefin according to the viscosity of the raw materials from low to high, melting one by one, maintaining the stirring speed at 30r/min, completely melting the raw materials, and keeping the constant temperature at 180 ℃;
step 4: heating and melting polystyrene-isoprene-styrene resin outside the reaction kettle, introducing the melted polystyrene-isoprene-styrene resin into the reaction kettle, maintaining the stirring speed at 30r/min, and keeping the constant temperature at 180 ℃;
step 5: sequentially adding petroleum resin, rosin resin and antioxidant, maintaining stirring speed at 20r/min, stirring uniformly, and introducing into a discharge port for extrusion molding.
Example 2
Comprises 10 parts of polystyrene-isoprene-styrene resin, 5 parts of metallocene polypropylene, 10 parts of random polyolefin, 30 parts of petroleum resin, 15 parts of rosin resin, 5 parts of polyisobutene and 0.5 part of antioxidant, wherein the diblock content of the polystyrene-isoprene-styrene resin is 30%.
The preparation method is the same as in example 1.
Example 3
Comprises 10 parts of polystyrene-isoprene-styrene resin, 5 parts of metallocene polypropylene, 10 parts of random polyolefin, 30 parts of petroleum resin, 15 parts of rosin resin, 5 parts of polyisobutene and 0.5 part of antioxidant, wherein the diblock content of the polystyrene-isoprene-styrene resin is 50%.
The preparation method is the same as in example 1.
Example 4
Comprises 15 parts of polystyrene-isoprene-styrene resin, 5 parts of metallocene polypropylene, 10 parts of random polyolefin, 30 parts of petroleum resin, 15 parts of rosin resin, 5 parts of polyisobutylene and 0.5 part of antioxidant, wherein the diblock content of the polystyrene-isoprene-styrene resin is 30 percent.
The preparation method is the same as in example 1.
Example 5
Comprises, by mass, 25 parts of polystyrene-isoprene-styrene resin, 5 parts of metallocene polypropylene, 10 parts of random polyolefin, 30 parts of petroleum resin, 15 parts of rosin resin, 5 parts of polyisobutylene and 0.5 part of antioxidant, wherein the diblock content of the polystyrene-isoprene-styrene resin is 30%.
The preparation method is the same as in example 1.
Example 6
The anti-oxidant comprises, by mass, 10 parts of polystyrene-isoprene-styrene resin, 10 parts of styrene-butadiene-styrene resin, 5 parts of metallocene polypropylene, 10 parts of random polyolefin, 30 parts of petroleum resin, 15 parts of rosin resin, 5 parts of polyisobutylene and 0.5 part of antioxidant, wherein the diblock content of the polystyrene-isoprene-styrene resin is 30%.
The preparation method comprises the following steps:
step 1: preheating a reaction kettle;
step 2: adding polyisobutene into a reaction kettle, heating the reaction kettle to 180 ℃ and keeping stirring at a stirring speed of 30r/min until the polyisobutene is completely melted, and keeping the constant temperature of 180 ℃;
step 3: sequentially adding metallocene polypropylene and random polyolefin according to the viscosity of the raw materials from low to high, melting one by one, maintaining the stirring speed at 30r/min, completely melting the raw materials, and keeping the constant temperature at 180 ℃;
step 4: heating and melting polystyrene-isoprene-styrene resin and styrene-butadiene-styrene resin outside the reaction kettle, introducing the melted polystyrene-isoprene-styrene resin and styrene-butadiene-styrene resin into the reaction kettle, maintaining the stirring speed at 30r/min, and keeping the constant temperature at 180 ℃;
step 5: sequentially adding petroleum resin, rosin resin and antioxidant, maintaining stirring speed at 20r/min, stirring uniformly, and introducing into a discharge port for extrusion molding.
Comparative example 1
Comprises 5 parts of metallocene polypropylene, 10 parts of random polyolefin, 30 parts of petroleum resin, 15 parts of rosin resin, 5 parts of polyisobutene and 0.5 part of antioxidant.
The preparation method is the same as in example 1.
Comparative example 2
Comprises 50 parts of polystyrene-isoprene-styrene resin, 5 parts of metallocene polypropylene, 10 parts of random polyolefin, 30 parts of petroleum resin, 15 parts of rosin resin, 5 parts of polyisobutene and 0.5 part of antioxidant, wherein the diblock content of the polystyrene-isoprene-styrene resin is 10 percent.
The preparation method is the same as in example 1.
Comparative example 3
Comprises 10 parts of polystyrene-isoprene-styrene resin, 5 parts of metallocene polypropylene, 10 parts of random polyolefin, 30 parts of petroleum resin, 15 parts of rosin resin, 5 parts of polyisobutene and 0.5 part of antioxidant, wherein the diblock content of the polystyrene-isoprene-styrene resin is 60%.
Performance tests were carried out on the hot melt adhesives prepared in examples 1 to 6 and comparative examples 1 to 3 or the hot melt adhesives after sizing, and the test items and results were as follows:
1. viscosity test method
Viscosity was measured according to GB/T2794-2013 Single Cylinder rotational viscometer, measurement of adhesive viscosity, results are reported in centipoise (cps).
2. Annular primary tack test: the test was performed according to the specifications of the national standard GB/T31125-2014, the results being recorded in N/inch.
3. Tensile strength test method: the object of measurement is a hot melt adhesive after application.
Determination of tensile Properties of plastics according to GB/T1040.1-2018 section 1: general rule, tensile strength was measured and the results reported in MPa.
4. 180 ° peel strength test: the test was performed according to the specifications of the national standard GB/T2792-2014, and the results were recorded in N/inch.
5. Content test of harmful substances: the third party inspection and detection service unit is entrusted to test whether cadmium, lead, mercury, hexavalent chromium, polybrominated diphenyl ethers (PBBs), polybrominated diphenyl ethers (PSDEs), phthalates (such as dibutyl phthalate (DBP), butyl Benzyl Phthalate (BBP), di (2-ethylhexyl) phthalate (DEHP) and diisobutyl phthalate (DIBP)) and the like meet the limit requirements of the European Union RoHS directive 2011/65/EU appendix II correction directive (EU) 2015/863.
6. Softening point test method: the measured object is hot melt adhesive without applying hair treatment
The results were recorded in degrees Celsius (C.) as measured according to GB/T15332-1994 method for measuring the softening point of hot melt adhesives.
The test results of the test items are as follows:
table 1: examples Hot melt adhesive Performance test data summary table
As shown in Table 1, the diblock content in the polystyrene-isoprene-styrene resins in the hot melt adhesives prepared in examples 1 to 3 of the present invention was increased one by one, and the other components and the preparation method were the same, and it can be seen from the data of Table 1 that as the diblock content in the SIS resin was increased, the viscosity was gradually decreased, the initial adhesion was gradually increased, and the softening point, the peel strength and the tensile strength were fluctuated, and were increased and then decreased. In examples 2, 4 and 5, the amount of SIS resin was gradually increased, and the other components and the preparation method were the same, and it was found that the viscosity, softening point, tack, peel strength and tensile strength of the hot melt adhesive were all increased with the increase in the amount of SIS resin, and the magnitude of the increase in peel strength and tensile strength was not large with the increase in the amount of SIS resin. In example 2 and example 6, styrene-butadiene-styrene resin was added as an elastomer, and it was found that the viscosity, softening point and initial adhesion of the hot melt adhesive were all increased, but the peel strength and tensile strength were slightly decreased by comparison with those of the SBS resin.
Table 2: comparative example Hot melt adhesive Performance test data summary table
Table 2 summarizes the data of comparative examples 1 to 3, and comparative examples 1 to 3 are comparative example 1 in which SIS resin was not added to comparative example 1, and other components and preparation methods were the same as those of example 1, and it is apparent from Table 2 that viscosity was low and initial adhesion and peel strength were low without adding SIS resin. In comparative example 2, an excessive amount of SIS resin was added to the composition of example 1, and it was found that the viscosity of the hot melt adhesive was significantly increased and other performance indexes were also significantly increased, but the surface properties of the hot melt adhesive were sticky and dust or other minute objects were easily adhered to the adhesive due to the excessively high viscosity. Comparative example 3 is a hot melt adhesive prepared from a low diblock content SIS resin replaced by a Gao Er block content SIS resin based on example 1, and it can be seen that the viscosity of the hot melt adhesive prepared from a high diblock content SIS resin is too low.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures disclosed herein or modifications in the equivalent processes, or any application of the structures disclosed herein, directly or indirectly, in other related arts.
Claims (10)
1. The hot melt adhesive for sealing the car lamp is characterized by comprising, by mass, 10-30 parts of a styrene thermoplastic elastomer, 5-15 parts of metallocene polypropylene, 10-30 parts of random polyolefin, 30-40 parts of petroleum resin, 15-25 parts of rosin resin, 5-15 parts of polyisobutylene and 0.1-1 part of an antioxidant.
2. The hot melt adhesive for vehicle lamp sealing according to claim 1, wherein the styrenic thermoplastic elastomer is a polystyrene-isoprene-styrene resin, and the diblock content of the styrenic thermoplastic elastomer is 10% to 50%.
3. The hot melt adhesive for vehicle lamp sealing according to claim 2, wherein the diblock content of the styrenic thermoplastic elastomer is 20% to 40%.
4. The hot melt adhesive for vehicle lamp sealing according to claim 1, comprising 15-25 parts of a styrenic thermoplastic elastomer, 5-10 parts of a metallocene-catalyzed polypropylene, 10-20 parts of a random polyolefin, 30-40 parts of a petroleum resin, 15-25 parts of a rosin resin, 5-15 parts of polyisobutylene, and 0.1-1 part of an antioxidant.
5. The hot melt adhesive for vehicle lamp sealing according to claim 1, further comprising a terpene-phenol resin, wherein the terpene-phenol resin is 5 to 10 parts by mass.
6. The hot melt adhesive for vehicle lamp sealing according to claim 1, wherein the petroleum resin is one or more of C5 petroleum resin, C9 petroleum resin or C5/C9 copolymerized petroleum resin.
7. The hot melt adhesive for vehicle lamp sealing according to claim 1, wherein the antioxidant is an aromatic amine antioxidant.
8. The hot melt adhesive for lamp sealing according to claim 1, further comprising 10 to 20 parts of styrene-butadiene-styrene resin.
9. A method for preparing a hot melt adhesive for vehicle lamp sealing according to any one of claims 1 to 8, comprising the steps of:
step 1: preheating a reaction kettle;
step 2: adding polyisobutene into the reaction kettle, heating the reaction kettle to 180 ℃ and keeping stirring at a stirring speed of 20-50r/min until the polyisobutene is completely melted, and keeping the constant temperature of 180 ℃;
step 3: sequentially adding metallocene polypropylene and random polyolefin from low to high according to the viscosity of the raw materials, melting one by one, maintaining the stirring speed at 20-50r/min, completely melting the raw materials, and keeping the constant temperature at 180 ℃;
step 4: heating and melting the styrene thermoplastic elastomer outside the reaction kettle, introducing the melted styrene thermoplastic elastomer into the reaction kettle, maintaining the stirring speed at 20-40r/min, and keeping the constant temperature at 180 ℃;
step 5: sequentially adding petroleum resin, rosin resin and antioxidant, maintaining stirring speed at 10-30r/min, stirring uniformly, and introducing into a discharge port for extrusion molding.
10. The method for preparing a hot melt adhesive for lamp seals of vehicle lamp according to claim 9, wherein when the styrene-butadiene-styrene resin is added, the styrene-butadiene-styrene resin and the styrenic thermoplastic elastomer are melted by heating outside the reaction vessel, and the melted mixture is introduced into the reaction vessel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311716845.6A CN117701204A (en) | 2023-12-14 | 2023-12-14 | Hot melt adhesive for sealing car lamp and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311716845.6A CN117701204A (en) | 2023-12-14 | 2023-12-14 | Hot melt adhesive for sealing car lamp and preparation method thereof |
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| Publication Number | Publication Date |
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| CN117701204A true CN117701204A (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311716845.6A Pending CN117701204A (en) | 2023-12-14 | 2023-12-14 | Hot melt adhesive for sealing car lamp and preparation method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN117701204A (en) |
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2023
- 2023-12-14 CN CN202311716845.6A patent/CN117701204A/en active Pending
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