CN114591714A - Hot melt adhesive for road expansion joints and preparation method thereof - Google Patents
Hot melt adhesive for road expansion joints and preparation method thereof Download PDFInfo
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- CN114591714A CN114591714A CN202210351793.6A CN202210351793A CN114591714A CN 114591714 A CN114591714 A CN 114591714A CN 202210351793 A CN202210351793 A CN 202210351793A CN 114591714 A CN114591714 A CN 114591714A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J195/00—Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a hot melt adhesive for road expansion joints and a preparation method thereof, wherein the hot melt adhesive comprises the following components in parts by weight: 15-35 parts of a polyurethane elastomer, 15-25 parts of a reactive elastomer, 15-25 parts of terpene resin, 0-5 parts of polyethylene wax, 5-10 parts of white oil and 40-60 parts of hard asphalt particles, wherein the polyurethane elastomer is a thermoplastic linear polyurethane elastomer terminated by C = C double bonds, and comprises the following components: 35-50 parts of polyether polyol, 5-10 parts of a chain extender, 30-40 parts of isocyanate and 5-10 parts of alkene alcohol. The hot melt adhesive for the expansion joint is prepared by the double-screw extrusion granulation equipment, so that the problems that the existing asphalt for the expansion joint is poor in adhesiveness to stone materials and the mixture is easy to crack are solved, and the service life of a pavement structure is effectively prolonged; meanwhile, the problems that the production temperature of the expansion joint hot melt adhesive is high, the production time is long, the feeding is complicated, the smoke is large, the energy consumption is high and the like are effectively avoided, the viscosity of the expansion joint hot melt adhesive is high, the construction temperature is reduced, and the construction workability is improved.
Description
Technical Field
The invention relates to the field of road and bridge materials, in particular to a hot melt adhesive for road expansion joints and a preparation method thereof.
Background
The cementing material for paving the seamless expansion joint of the road and bridge takes waste tire rubber powder as a main modifier, is matched with a small amount of SBS, light oil and other materials to improve the flexibility and low-temperature performance of asphalt, and is added with a large amount of inorganic fillers such as stone powder, mineral powder, heavy calcium and the like to improve the high-temperature anti-rutting performance, so that the cementing material for the expansion joint has high and low temperature performance, typical products such as British prism BJ200 series and domestic TST asphalt can be fed back according to the actual engineering application effect, and the problem of cracking of the seamless expansion joint of an asphalt base often occurs.
At present, the commercially available expansion joint asphalt is added with a large amount of organic modifiers such as SBS, rubber powder and the like and inorganic fillers such as stone powder, the production mode is mostly in an asphalt reaction kettle, all kinds of modifiers are put in batches at 180-200 ℃ (feeding is carried out at high temperature, a large amount of asphalt smoke generates great harm to the health of feeding workers), the modifier dispersion is realized by means of shearing or stirring (the modifiers are difficult to disperse and easy to agglomerate), the cohesive strength of the prepared finished cementing material is increased, the toughness is poor, the asphalt self-forming system at low temperature is poor in contractility, meanwhile, the wetting property and the bonding strength of stone materials are poor, cracking is easy, the viscosity still reaches more than 10Pa.s at 190 ℃, pipelines are easy to block, pumping cannot be carried out, only gravity feeding can be carried out, and the production efficiency is low. The traditional asphalt expansion joint construction is that asphalt is heated by on-site open fire and is mixed in an open manner, the temperature is high, the asphalt smoke is large, and the construction efficiency is low.
In view of the defects existing in the production and use of the existing asphalt material for the expansion joint, the inventor develops the hot melt adhesive for the road expansion joint and the preparation method thereof by matching theoretical analysis and innovation based on years of rich experience and professional knowledge of the material. The hot melt adhesive with good flexibility and high bonding strength is used as the cementing material of the expansion joint, the cracking problem can be effectively prevented, the production mode of extruding and granulating is adopted to replace the traditional high-temperature rubber asphalt production mode, and the problems of high temperature, large smoke, shearing requirement, long time development and the like in the production process of the hot melt adhesive for the expansion joint are effectively solved.
Disclosure of Invention
One of the purposes of the invention is to provide a hot melt adhesive for road expansion joints, which can greatly improve the bonding performance with stone materials and the flexibility of the hot melt adhesive, prolong the service life of a pavement structure, and solve the problems of complicated feeding, large smoke, too high discharging viscosity, incapability of pumping and the like in the production of the existing cementing material for the expansion joints; in order to achieve the purpose, the invention specifically adopts the following technical scheme:
the utility model provides a hot melt adhesive for road expansion joint, the hot melt adhesive includes each component of following part by weight: 15-35 parts of a polyurethane elastomer, 15-25 parts of a reactive elastomer, 15-25 parts of terpene resin, 0-5 parts of polyethylene wax, 5-10 parts of white oil and 40-60 parts of hard asphalt particles, wherein the polyurethane elastomer is a thermoplastic linear polyurethane elastomer terminated by C ═ C double bonds, and comprises the following components: 35-50 parts of polyether polyol, 5-10 parts of a chain extender, 30-40 parts of isocyanate and 5-10 parts of alkene alcohol.
The reactive elastomer has excellent high-temperature flexibility and deformation resistance, and is subjected to a grafting reaction with a C ═ C double bond-terminated thermoplastic linear polyurethane elastomer in an extrusion granulation process at 140-160 ℃, so that the low-temperature flexibility and the flexibility of the reactive elastomer are greatly improved, the stress generated outside can be effectively relieved and released, and the problem of cracking of road expansion joints caused by overhigh self-strength is prevented; on the other hand, the terpene resin has good wettability to stone materials and excellent structural performance, but has large brittleness, and the epoxy modified reactive elastomer grafted with TPU can effectively make up the defects of low-temperature brittleness and insufficient toughness of the terpene resin, improve the wettability and the bonding strength of the terpene resin and the stone materials, and ensure good elasticity of the hot melt adhesive for expansion joints.
Preferably, the polyether polyol is a polyol having a functionality of 2 and a molecular weight of 1000 to 4000, such as DOW Voranol 230, Shandong Lanxing DL1000, DL2000, DL3000, etc. Ether bonds in the polyether polyol molecular chain structure have lower cohesive energy and are easy to rotate, so that the prepared polyurethane elastomer material has better low-temperature flexibility and hydrolytic stability.
Preferably, the chain extender is a binary straight-chain fatty alcohol, such as one of ethylene glycol, propylene glycol and butanediol; the isocyanate is one of diphenylmethane diisocyanate (MDI) with NCO content of more than 20% and Toluene Diisocyanate (TDI); the alkene alcohol is one of allyl alcohol and alkene butanol. The polyurethane elastomer has higher mechanical strength and flexibility, so that the strength, flexibility, weather resistance and aging resistance of the hot melt adhesive can be further improved, and the rutting resistance of the finally formed asphalt pavement is improved.
Preferably, the preparation method of the polyurethane elastomer comprises the following steps:
s1, putting polyether polyol and a chain extender into a reaction kettle, heating to 100-120 ℃, and carrying out vacuum dehydration for 30 min;
s2, putting isocyanate into a reaction kettle, and reacting for 2 hours at 100-120 ℃;
s3, adding the alkene alcohol into the reaction kettle, reacting for 1 hour at 100-120 ℃, and cooling to room temperature to obtain the polyurethane elastomer.
Preferably, the reactive elastomer is an ethylene-acrylate terpolymer containing an epoxy functional group, and the reactive elastomer has low crystallinity and good high-temperature flexibility and deformation resistance, such as Dupont elvaloy 4170, 4924, 741 and the like. Through the grafting reaction with the thermoplastic linear polyurethane elastomer, the hot melt adhesive system for the expansion joint has excellent high temperature resistance, wear resistance and deformation resistance, and the cracking of the road expansion joint is avoided.
Preferably, the terpene resin is one of T-110 and T-120, the softening point of the terpene resin is 110-120 ℃, the softening point is close to the use temperature of the material of 120-150 ℃, the terpene resin has higher thermal stability and high-temperature adhesion, and the bonding performance to stone is effectively improved.
Preferably, the low molecular weight polyethylene wax has better internal lubricating effect and more obvious effect of reducing the viscosity of a system compared with the saturated straight-chain alkane with the molecular weight of 600-1000 of the low molecular weight polyethylene wax with the molecular weight of more than 2000. The polyethylene wax is dissolved at high temperature (about 100 ℃ C.) -140 ℃ C, and is precipitated when cooled to normal temperature, and exists in a system in a microcrystalline form, and is favorable for storage of the hot melt adhesive due to the specific thixotropy.
Preferably, the white oil is one or more of 3#, 5#, 10#, 15# and the like, the main component of the white oil is a saturated hydrocarbon structure, and the lower the grade, the lower the viscosity, and the better the flexibility, dispersion and viscosity reduction effects. Can be used as lubricating oil in a double-screw extruder, and is convenient for extrusion and granulation of the additive. Meanwhile, the white oil used as the micromolecular hydrocarbon material can effectively improve the compatibility between the epoxy modified reaction type elastomer grafted with the macromolecule polyurethane elastomer and the terpene resin, the polyethylene wax and the hard asphalt particles, and improve the mixing uniformity of the hot melt adhesive.
Preferably, the hard asphalt particles have a softening point of 100-140 ℃ and ash content of less than 1%, such as Luoyangyuchen I-type and Luoyangchen II-type master batches, so that the high-temperature strength and the system compatibility of the hot melt adhesive are improved.
The invention also aims to provide a preparation method of the hot melt adhesive for the road expansion joint, which comprises the following steps:
s1, uniformly mixing the reactive elastomer, the terpene resin and the polyurethane elastomer by using a mixer;
s2, adding polyethylene wax, white oil and hard asphalt particles, and continuously mixing for 5-10 min until the mixture is uniform;
s3140-160 ℃, and extruding and granulating by using double screws to obtain the hot melt adhesive for the expansion joint.
The hot melt adhesive for the expansion joint is prepared by twin-screw extrusion granulation, so that the problems of complex feeding, large smoke, too high discharge viscosity, incapability of pumping and the like in the production of the conventional asphalt for the expansion joint are solved.
Through the technical scheme, the invention has the beneficial effects that:
(1) the reactive elastomer containing the epoxy functional group used in the invention has excellent high-temperature flexibility and deformation resistance, and can effectively eliminate the problem of high-temperature rutting of an expansion joint, the thermoplastic polyurethane elastomer is a high-molecular-weight two-dimensional linear chain segment structure with end capping of C ═ C double bonds, has excellent flexibility and flexibility, and is subjected to grafting reaction with the reactive elastomer containing the epoxy functional group in an extrusion granulator at 140-160 ℃, so that the formed plastic polymer has both high-temperature flexibility and low-temperature flexibility, can effectively relieve and release external stress generated by low-temperature deformation of the expansion joint, and can prevent the problem of cracking caused by overhigh self-strength.
(2) The high-melting-point terpene resin used in the invention has excellent high-temperature stability and high-temperature adhesion, can effectively infiltrate stones, improve the bonding strength with the stones and prevent cracking, but the terpene resin is easy to crystallize and brittle fracture at low temperature as a brittle material; the low molecular weight polyethylene wax has excellent internal lubricating property and obvious high-temperature viscosity reduction effect, can effectively reduce the construction temperature, but is easy to crystallize at the same low temperature, and the flexibility of the epoxy modified reaction type elastomer of the grafted polyurethane elastomer can well offset the problem caused by easy crystallization of the epoxy modified reaction type elastomer and the grafted polyurethane elastomer; the expansion performance of the hot melt adhesive for the expansion joint is ensured to be good.
(3) The reactive elastomer, the terpene resin, the polyethylene wax and the hard asphalt particles are all hydrocarbon substances and have good compatibility, but the reactive elastomer is grafted with the macromolecular polyurethane elastomer, so that the compatibility of the reactive elastomer with other hydrocarbon substances is reduced, and the white oil serving as the micromolecular saturated hydrocarbon substance has obvious viscosity reduction effect, good compatibility with other hydrocarbon substances and capacity promotion effect, so that the compatibility of the epoxy modified reactive elastomer grafted with the polyurethane elastomer with other raw materials can be effectively improved, and the system stability is improved.
(4) The conventional cementing material for the expansion joint needs to be prepared by heating the matrix asphalt to 180-200 ℃, adding a large amount of modifiers such as SBS, rubber powder and the like, stirring for a long time, and finally shearing and over-grinding to form a uniform cementing material dispersoid, and has high requirements on production equipment and production process. The melting points of the selected raw materials of the hot melt adhesive are less than 150 ℃, the hot melt adhesive is easily melted when being heated at 140-160 ℃, meanwhile, the white oil and the polyethylene wax are added in the preparation process of the hot melt adhesive, so that the effects of heat transfer, internal lubrication and dispersion assistance are achieved, the raw materials are more easily and uniformly mixed, an extruder is adopted for granulation, and the production process is simple and convenient.
(5) The traditional cementing material for the expansion joint has overlarge viscosity, and can be used for mixing of a mixture and filling of a pavement structure gap by heating to 180-200 ℃ usually, asphalt can generate a large amount of asphalt smoke at the temperature higher than 150 ℃, and the control on the construction temperature is required to be accurate, the asphalt is easy to age at the overhigh temperature (200 ℃), the viscosity is large at the overlow temperature (180 ℃), and the asphalt is difficult to mix and disperse. The hot melt adhesive for the expansion joint prepared by the invention has a relatively low melting point, has good fluidity and construction workability at 120-150 ℃, and effectively solves the problems of high temperature, large asphalt smoke and the like in the production process of a cementing material for the expansion joint.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined objects, the detailed description of the embodiments, features and effects of the hot melt adhesive for road expansion joints and the preparation method thereof according to the present invention are as follows.
In a specific example of the invention, each of the commercially available material sources is as follows:
polyether polyol: shandong Lanxingdong Co Ltd
Isocyanate: hensmei polyurethane (China) Co., Ltd
Chain extender: suzhou Jiu chemical Co Ltd
Olefin alcohol: shandong Lanxingdong Co Ltd
A reactive elastomer: dupont Corp
Terpene resin: henan Jieshiman petrochemical Co., Ltd
Polyethylene wax: qingdao Sainuo New Material Co Ltd
White oil: shandong cloisonne chemical Co Ltd
Hard asphalt particles: luoyang Yuchen petrochemical Co.
Example 1:
the hot melt adhesive for road expansion joints provided in this embodiment includes 15 parts of a reactive elastomer (elvaloy 4170, dupont), 25 parts of a terpene resin (KD-138A, jews petrochemical), 30 parts of a polyurethane elastomer (self-made), 3 parts of a polyethylene wax (SN9088D, qingdao), and 10 parts of a white oil (No. 15, santochine chemical); 40 parts of hard asphalt particles (Luoyang Yuchen type I); the polyurethane elastomer comprises the following components: 45 parts of polyether polyol (DL2000, Shandong Lanxing), 8 parts of chain extender (ethylene glycol), 30 parts of isocyanate (S2004, Hensman) and 5 parts of alkene alcohol (allyl alcohol).
The preparation process of the polyurethane elastomer comprises the following steps:
s1, placing 45 parts of polyether polyol and 8 parts of chain extender into a reaction kettle, heating to 100-120 ℃, and carrying out vacuum dehydration for 30 min;
s2, adding 30 parts of isocyanate into a reaction kettle, and reacting for 2 hours at 100-120 ℃;
s3, 5 parts of alkene alcohol is put into a reaction kettle, reacted for 1 hour at 100-120 ℃, and cooled to room temperature to obtain the polyurethane elastomer.
The preparation process of the hot melt adhesive for the road expansion joint comprises the following steps:
s1, mixing 15 parts of reactive elastomer, 25 parts of terpene resin and 30 parts of polyurethane elastomer uniformly by using a mixer;
s2, adding 3 parts of polyethylene wax, 10 parts of white oil and 40 parts of hard asphalt particles, and continuously and uniformly mixing;
s3140-160 ℃, and extruding and granulating by using double screws to obtain the hot melt adhesive for the expansion joint.
Example 2:
the hot melt adhesive for the road expansion joint provided in the embodiment comprises 15 parts of a reactive elastomer (elvaloy 4924, dupont), 25 parts of a terpene resin (KD-1100T, henan jieshman petrochemical), 15 parts of a polyurethane elastomer (self-made), 3 parts of polyethylene wax (SN105A, qingdaseuo), 7 parts of white oil (No. 10, Shandong cloisonne chemical engineering), and 50 parts of hard asphalt particles (type ii luoyun Yuchen); the polyurethane elastomer comprises the following components: 35 parts of polyether polyol (DL3000, Shandong Lanxing), 5 parts of chain extender (ethylene glycol), 35 parts of isocyanate (S2004, Hensman) and 5 parts of alkene alcohol (allyl alcohol).
The preparation process of the polyurethane elastomer comprises the following steps:
s1, placing 35 parts of polyether polyol and 5 parts of chain extender into a reaction kettle, heating to 100-120 ℃, and carrying out vacuum dehydration for 30 min;
s2, adding 35 parts of isocyanate into a reaction kettle, and reacting for 2 hours at 100-120 ℃;
s3, 5 parts of alkene alcohol is put into a reaction kettle, reacted for 1 hour at 100-120 ℃, and cooled to room temperature to obtain the polyurethane elastomer.
The preparation process of the hot melt adhesive for the road expansion joint comprises the following steps:
s1, mixing 15 parts of reactive elastomer, 25 parts of terpene resin and 15 parts of polyurethane elastomer uniformly by using a mixer;
s2, adding 3 parts of polyethylene wax, 7 parts of white oil and 50 parts of hard asphalt particles, and continuously and uniformly mixing;
s3140-160 ℃, and extruding and granulating by using double screws to obtain the hot melt adhesive for the expansion joint.
Example 3:
the hot melt adhesive for road expansion joints provided in this embodiment includes 25 parts of a reactive elastomer (elvaloy 741, dupont), 20 parts of a terpene resin (KD-1315T, hennan jiemann petrochemical), 25 parts of a polyurethane elastomer (homemade), 3 parts of a polyethylene wax (SN9120, qingdaseuo), 5 parts of a white oil (No. 100, Shandong cloisonne chemical), and 60 parts of a hard asphalt particle (type i Luoyang Yuchen); the polyurethane elastomer comprises the following components: 50 parts of polyether polyol (DL1000, Shandong Lanxing), 10 parts of chain extender (ethylene glycol), 40 parts of isocyanate (S2004, Hensman) and 5 parts of alkene alcohol (allyl alcohol).
The preparation process of the polyurethane elastomer comprises the following steps:
s1, placing 50 parts of polyether polyol and 10 parts of chain extender into a reaction kettle, heating to 100-120 ℃, and carrying out vacuum dehydration for 30 min;
s2, putting 40 parts of isocyanate into a reaction kettle, and reacting for 2 hours at 100-120 ℃;
s3, 5 parts of alkene alcohol is put into a reaction kettle, reacted for 1 hour at 100-120 ℃, and cooled to room temperature to obtain the polyurethane elastomer.
The preparation process of the hot melt adhesive for the road expansion joint comprises the following steps:
s1, mixing 25 parts of reactive elastomer, 20 parts of terpene resin and 25 parts of polyurethane elastomer uniformly by using a mixer;
s2, adding 3 parts of polyethylene wax, 5 parts of white oil and 60 parts of hard asphalt particles, and continuously and uniformly mixing;
s3140-160 ℃, and extruding and granulating by using double screws to obtain the hot melt adhesive for the expansion joint.
Comparative example 1:
the hot melt adhesive for the road expansion joint provided in the comparative example comprises 25 parts of terpene resin (KD-138A, Henan Jieshiman petrochemical), 30 parts of polyurethane elastomer (self-made), 3 parts of polyethylene wax (SN9088D, Qingdao Sainuo) and 10 parts of white oil (No. 15, Shandong cloisonne chemical engineering); 40 parts of hard asphalt particles (Luoyang Yuchen type I); the polyurethane elastomer comprises the following components: 45 parts of polyether polyol (DL2000, Shandong Lanxing), 8 parts of chain extender (ethylene glycol), 30 parts of isocyanate (S2004, Hensman) and 5 parts of alkene alcohol (allyl alcohol).
The preparation process of the polyurethane elastomer comprises the following steps:
s1, placing 45 parts of polyether polyol and 8 parts of chain extender into a reaction kettle, heating to 100-120 ℃, and carrying out vacuum dehydration for 30 min;
s2, adding 30 parts of isocyanate into a reaction kettle, and reacting for 2 hours at 100-120 ℃;
s3, 5 parts of alkene alcohol is put into a reaction kettle, reacted for 1 hour at 100-120 ℃, and cooled to room temperature to obtain the polyurethane elastomer.
The preparation process of the hot melt adhesive for the road expansion joint comprises the following steps:
s1, mixing 25 parts of terpene resin and 30 parts of polyurethane elastomer uniformly by using a mixer;
s2, adding 3 parts of polyethylene wax, 10 parts of white oil and 40 parts of hard asphalt particles, and continuously and uniformly mixing;
s3140-160 ℃, and extruding and granulating by using double screws to obtain the hot melt adhesive for the expansion joint.
Comparative example 2:
the hot melt adhesive for road expansion joints provided in the comparative example comprises 15 parts of a reactive elastomer (elvaloy 4170, dupont), 30 parts of a polyurethane elastomer (self-made), 3 parts of polyethylene wax (SN9088D, Qingdao Sainuo), and 10 parts of white oil (No. 15, Shandong cloisonne chemical industry); 40 parts of hard asphalt particles (Luoyang Yuchen type I); the polyurethane elastomer comprises the following components: 45 parts of polyether polyol (DL2000, Shandong Lanxing), 8 parts of chain extender (ethylene glycol), 30 parts of isocyanate (S2004, Hensman) and 5 parts of alkene alcohol (allyl alcohol).
The preparation process of the polyurethane elastomer comprises the following steps:
s1, placing 45 parts of polyether polyol and 8 parts of chain extender into a reaction kettle, heating to 100-120 ℃, and carrying out vacuum dehydration for 30 min;
s2, adding 30 parts of isocyanate into a reaction kettle, and reacting for 2 hours at 100-120 ℃;
s3, 5 parts of alkene alcohol is put into a reaction kettle, reacted for 1 hour at 100-120 ℃, and cooled to room temperature to obtain the polyurethane elastomer.
The preparation process of the hot melt adhesive for the road expansion joint comprises the following steps:
s1, mixing 15 parts of reactive elastomer and 30 parts of polyurethane elastomer uniformly by using a mixer;
s2, adding 3 parts of polyethylene wax, 10 parts of white oil and 40 parts of hard asphalt particles, and continuously and uniformly mixing;
s3140-160 ℃ and carrying out double-screw extrusion granulation to obtain the hot melt adhesive for the expansion joint.
Comparative example 3:
the hot melt adhesive for the road expansion joint provided in the comparative example comprises 15 parts of a reactive elastomer (elvaloy 4170, dupont), 25 parts of a terpene resin (KD-138A, hennan jiemann petrochemical), 3 parts of a polyethylene wax (SN9088D, Qingdao Sainuo), and 10 parts of a white oil (No. 15, Shandong cloisonne chemical); 40 parts of hard asphalt particles (Luoyang Yuchen type I).
The preparation process of the hot melt adhesive for the road expansion joint comprises the following steps:
s1, mixing 15 parts of reactive elastomer and 25 parts of terpene resin uniformly by a mixer;
s2, adding 3 parts of polyethylene wax, 10 parts of white oil and 40 parts of hard asphalt particles, and continuously and uniformly mixing;
s3140-160 ℃, and extruding and granulating by using double screws to obtain the hot melt adhesive for the expansion joint.
Test experiments
The current industrial standard of bridge non-expansion joint asphalt cement material refers to JT/T740 in the low-temperature tensile test mode in the application.
The performance indexes of the hot melt adhesive for the expansion joint in the specific examples 1-3 and the comparative examples 1-3 are shown in the following table 1:
TABLE 1 Performance index of Hot melt adhesive for expansion joints
| Test items | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Softening point/. degree.C | 99.5 | 96.2 | 106.7 | 80.1 | 93.7 | 94.8 |
| Penetration/dmm | 30.1 | 34.1 | 28.4 | 54.2 | 32.4 | 29.4 |
| Elastic recovery/%) | 95 | 90 | 93 | 97 | 95 | 83 |
| Viscosity at 190 ℃ in Pa.s | 2.4 | 1.9 | 2.9 | 2.3 | 2.1 | 1.2 |
| Stretching at low temperature | By passing | By passing | By passing | By passing | Failed through | By passing |
As can be seen from table 1 above, examples 1 to 3 are some preferred examples of the present invention, and the data show that the hot melt adhesive for expansion joints prepared by using the method and the material has excellent elastic recovery, avoids cracking, has softening points of more than 90 ℃, passes low-temperature stretching, and has good high and low-temperature performance. The viscosity is good at 190 ℃, the pumping transportation is convenient, and the production efficiency is high.
Comparative example 1 compared to example 1, without the addition of the reactive elastomer, the softening point of the asphalt decreased by 19.4 and the penetration increased by 24.1dmm, indicating that the spatial network structure formed by the reactive elastomer in the hot melt adhesive has a significant effect on the high temperature performance.
Comparative example 2 compared with example 1, no terpene resin was added, and the low-temperature stretching did not pass, which shows that the terpene resin plays a key role in the adhesive property of the hot melt adhesive; the terpene resin has good wettability to stone, can effectively improve the bonding property to stone, and ensures that the hot melt adhesive for the expansion joint has good elasticity.
Comparative example 3 compared to example 1, without the addition of the polyurethane elastomer, the elastic recovery of the hot melt was reduced by 12%, indicating that the polyurethane elastomer greatly affects the flexibility. Meanwhile, compared with the reactive elastomer grafted macromolecular polyurethane elastomer in the example 1, the viscosity at 190 ℃ of the comparative example 3 is lower, because the polyurethane elastomer as a macromolecular material has poor compatibility with other hydrocarbon substances. The invention reduces the viscosity of the system through the white oil and ensures good compatibility among materials.
Specifically, the performance indexes of the mixture for the expansion joint using the hot melt adhesive in the examples 1 to 3 and the comparative examples 1 to 3 are shown in the following table 2, the hot melt adhesive for the expansion joint and a certain amount of single-grain stone are uniformly mixed, and the seamless expansion joint is paved according to a process structure of rolling three oil stones and two stone stones.
TABLE 2 Performance index of mixture for expansion joints
Note: the oil-stone ratio of the mixture is 25 percent, the stone is basalt stone, and the grain diameter is 15-20 mm
As can be seen from table 2 above, in comparative example 1, compared to example 1, the reactive elastomer is not added, and both the dynamic stability of the rutting test of the mixture and the breaking strain of the low-temperature bending test are greatly reduced, which indicates that the reactive elastomer plays a key role in the rutting resistance of the cementing material for the expansion joint; the reactive elastomer has a three-dimensional skeleton structure in the hot melt adhesive, and provides high-temperature, anti-rutting, low-temperature and anti-cracking effects for the hot melt adhesive.
Compared with the embodiment 1, the terpene resin is not added in the comparative example 2, the dynamic stability of the rutting test and the breaking strain of the low-temperature bending test of the mixture are reduced to a certain degree, and the data in the table 1 show that the terpene resin has certain influence on the high and low temperature of the performance of the mixture.
Compared with the example 1, the polyurethane elastomer is not added, the low-temperature bending test breaking strain of the mixture is greatly reduced, and the data in the table 1 show that the polyurethane elastomer has great influence on the low-temperature performance of the mixture. Through the grafting reaction with reaction type elastomer, can promote reaction type elastomer's low temperature flexibility and elasticity by a wide margin, avoid the emergence of road expansion joint fracture problem.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The hot melt adhesive for the road expansion joint is characterized by comprising the following components in parts by weight: 15-35 parts of polyurethane elastomer, 15-25 parts of reactive elastomer, 15-25 parts of terpene resin, 0-5 parts of polyethylene wax, 5-10 parts of white oil and 40-60 parts of hard asphalt particles; the polyurethane elastomer is a thermoplastic linear polyurethane elastomer terminated by C = C double bonds, and comprises the following components in parts by weight: 35-50 parts of polyether polyol, 5-10 parts of a chain extender, 30-40 parts of isocyanate and 5-10 parts of alkene alcohol.
2. The hot melt adhesive for road expansion joints according to claim 1, wherein the polyether polyol is a polyol having a functionality of 2 and a molecular weight of 1000 to 4000.
3. The hot melt adhesive for road expansion joints according to claim 2, wherein the chain extender is a binary straight-chain fatty alcohol; the isocyanate is any one of diphenylmethane diisocyanate and toluene diisocyanate; the alkene alcohol is any one of allyl alcohol and alkene butanol.
4. The hot melt adhesive for road expansion joints according to claim 3, wherein the preparation method of the polyurethane elastomer comprises the following steps:
s1: putting polyether polyol and a chain extender into a reaction kettle, heating to 100-120 ℃, and carrying out vacuum dehydration for 30 min;
s2: putting isocyanate into a reaction kettle, and reacting for 2 hours at 100-120 ℃;
s3: and (3) putting the alkene alcohol into a reaction kettle, reacting for 1h at 100-120 ℃, and cooling to room temperature to obtain the polyurethane elastomer.
5. The hot melt adhesive for road expansion joints according to claim 4, wherein the reactive elastomer is an ethylene-acrylate terpolymer containing epoxy functional groups.
6. The hot melt adhesive for road expansion joints according to claim 4, wherein the terpene resin is an aliphatic nonpolar terpene resin, and the softening point is 110-120 ℃.
7. The hot melt adhesive for road expansion joints according to claim 4, wherein the polyethylene wax is saturated straight-chain paraffin with a molecular weight of 600-1000.
8. The hot melt adhesive for road expansion joints according to claim 4, wherein the white oil is one or more of 3#, 5#, 10#, 15# and the like.
9. The hot melt adhesive for road expansion joints according to claim 4, wherein the hard asphalt particles have a softening point of 100-140 ℃ and an ash content of less than 1%.
10. The method for preparing the hot melt adhesive for the road expansion joint according to any one of claims 1 to 9, which is characterized by comprising the following steps:
s1: uniformly mixing the reactive elastomer, the terpene resin and the polyurethane elastomer by using a mixer;
s2: adding polyethylene wax, white oil and hard asphalt particles, and continuously mixing for 5-10 min until the mixture is uniform;
s3: and extruding and granulating by using double screws at the temperature of 140-160 ℃ to obtain the hot melt adhesive for the expansion joint.
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| CN202210351793.6A CN114591714B (en) | 2022-04-02 | 2022-04-02 | Hot melt adhesive for road expansion joint and preparation method thereof |
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Citations (4)
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|---|---|---|---|---|
| JP2000239527A (en) * | 1999-02-22 | 2000-09-05 | Nippon Mitsubishi Oil Corp | Modified asphalt composition for water-draining pavement |
| CN109749688A (en) * | 2018-12-25 | 2019-05-14 | 上海邦中新材料有限公司 | A kind of hot melt adhesive Nian Jie with polyester non-woven fabric for metal and preparation method thereof |
| CN112226180A (en) * | 2020-10-10 | 2021-01-15 | 厦门联合信诺新材料有限公司 | Hot melt adhesive film for composite shoe sole and preparation method thereof |
| WO2021208508A1 (en) * | 2020-04-16 | 2021-10-21 | 何建雄 | Adhesive film for carton packaging industry and preparation method therefor |
-
2022
- 2022-04-02 CN CN202210351793.6A patent/CN114591714B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000239527A (en) * | 1999-02-22 | 2000-09-05 | Nippon Mitsubishi Oil Corp | Modified asphalt composition for water-draining pavement |
| CN109749688A (en) * | 2018-12-25 | 2019-05-14 | 上海邦中新材料有限公司 | A kind of hot melt adhesive Nian Jie with polyester non-woven fabric for metal and preparation method thereof |
| WO2021208508A1 (en) * | 2020-04-16 | 2021-10-21 | 何建雄 | Adhesive film for carton packaging industry and preparation method therefor |
| CN112226180A (en) * | 2020-10-10 | 2021-01-15 | 厦门联合信诺新材料有限公司 | Hot melt adhesive film for composite shoe sole and preparation method thereof |
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| CN114591714B (en) | 2023-07-21 |
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