A kind of seamless expansion joint filler sealant and its preparation method and application

A seamless expansion and joint filling technology, applied in the direction of adhesives, polymer adhesive additives, adhesive additives, etc., can solve the problems of debonding and water seepage of the pavement layer, unsatisfactory use effect, high price, etc. Interfacial bonding performance, avoiding the generation and cracking of internal stress, and enhancing the effect of bonding ability

Active Publication Date: 2020-05-19
GUANGZHOU MUNICIPAL ENG MAINTENANCE DEPT
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] At present, most of the sealants used in the joint fillers of seamless expansion joints on the market are imported materials, which are expensive, and many problems of debonding and water seepage from the original bridge deck pavement are found in the process of use.
Some expansion joint materials have been independently developed in China, but compared with imported materials, the actual use effect is not ideal. Cracking, shifting, and insufficient bonding with the original pavement structure are typical defects of seamless expansion joint materials

Method used

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  • A kind of seamless expansion joint filler sealant and its preparation method and application
  • A kind of seamless expansion joint filler sealant and its preparation method and application
  • A kind of seamless expansion joint filler sealant and its preparation method and application

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preparation example Construction

[0036] The present invention also provides a preparation method of the seamless expansion joint sealant described in the above technical solution, comprising the following steps:

[0037] Liquid 90 # Asphalt, tackifier and styrene-butadiene-styrene block copolymer are mixed for the first shear to obtain asphalt mother liquor;

[0038] The asphalt mother liquor, plasticizer, toughening agent P4U, stabilizer and compatibilizer are mixed for second shearing to obtain the seamless expansion joint sealant.

[0039] The present invention will liquid 90 # The asphalt, the tackifier and the styrene-butadiene-styrene block copolymer are mixed for the first shearing to obtain the asphalt mother liquor.

[0040] In the present invention, the liquid 90 # The temperature of the pitch is preferably 165 to 170°C. In the present invention, the first shearing is preferably carried out in a colloid mill, the rate of the first shearing is preferably 6000-8000r / min, which can be adjusted acco...

Embodiment 1

[0048] According to the number of parts by mass, weigh 100 parts 90 # Bitumen, 1 part terpene resin, 4 parts SBS, 2 parts dioctyl phthalate, 4 parts toughening agent P4U, 0.3 part sodium carboxymethylcellulose, and 0.3 part butadiene.

[0049] Add terpene resin and SBS to liquid 90 at 165°C # Asphalt is milled at a high speed in a colloid mill with a shear rate of 6000r / min. After shearing, the asphalt mother liquor is obtained. The particle size of the asphalt mother liquor is 10-30μm, the viscosity is 79752Pa.S, and the elastic recovery is 91.6%.

[0050] After the asphalt mother liquor was kept at 180°C for 2 hours, it was mixed with dioctyl phthalate, P4U, sodium carboxymethyl cellulose and butadiene, and then dispersed in a high-speed shearing machine with a shear rate of 5000r / min, to obtain seamless expansion joint filler sealant.

[0051] The performance of the obtained seamless expansion joint sealant was tested, and the test results are shown in Table 1.

Embodiment 2

[0053] According to the number of parts by mass, weigh 100 parts 90 # Bitumen, 2 parts rosin resin, 6 parts SBS, 2 parts dibutyl phthalate, 2 parts toughener P4U, 0.5 part polyvinyl alcohol, and 0.5 part styrene.

[0054] Add rosin resin and SBS to liquid 90 at 170°C # Asphalt is milled at a high speed in a colloid mill with a shear rate of 8000r / min, and the asphalt mother liquor is made by shearing. The particle size of the asphalt mother liquor mixture is 10-30μm, the viscosity is 276453Pa.S, and the elastic recovery is 98.4%.

[0055] After the asphalt mother liquor was kept at 180°C for 2 hours, it was grafted with dibutyl phthalate, P4U, polyvinyl alcohol and starch to carry out high-speed shear dispersion in a high-speed shearing machine at a shear rate of 6000r / min, get the seamless expansion joint sealant.

[0056] The performance of the obtained seamless expansion joint sealant was tested, and the test results are shown in Table 1.

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Abstract

The invention provides a seamless expansion joint filling material sealant and a preparing method and application thereof, and belongs to the field of road building materials and engineering. The seamless expansion joint filling material sealant is prepared from, by mass, 100 parts of 90# asphalt, 1-2 parts of a tackifier, 4-6 parts of SBS, 1-2 parts of a plasticizer, 2-4 parts of a toughening agent P4U, 0.2-0.5 part of a stabilizer and 0.2-0.5 part of a bulking agent. According to the seamless expansion joint filling material sealant and the preparing method and application thereof, by designing the raw materials and proportion of the sealant, the sealant has good viscoelasticity, toughness, rut resistance and resistance to shock-produced deformation, the requirement for adapting to deformation, load and other complicated working conditions in high-temperature and low-temperature environments is met, the problems that existing materials are easily cracked and moved under pushing, andthe adhesion power between the materials and an original pavement structure is insufficient are solved, and the service life of expansion joints is prolonged; moreover, adverse influence on workers during use can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of road construction materials and engineering, and in particular relates to a seamless expansion joint filler sealant and a preparation method and application thereof. Background technique [0002] The bridge seamless expansion joints can form a continuous whole with the bridge deck pavement layers before and after, the bridge deck is flat and seamless, and the driving is stable, comfortable, noise-free and low-vibration. Bridge seamless expansion joints have the advantages of simple structure, convenient and fast construction, easy maintenance, good waterproof performance, and acid and alkali corrosion resistance. People pay more and more attention to their application. [0003] The key technology of seamless expansion joints lies in the expansion joint filler. The seamless expansion joints of bridges are easily affected by the expansion and contraction deformation of concrete slabs, the deformation caused by the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J4/06C09J11/06C09J11/08
CPCC09J4/06C09J11/06C09J11/08
Inventor 余志雄彭馨彦林智勇林勇文甄文君吴凯旋吕爱华洪晶邱熙锋
Owner GUANGZHOU MUNICIPAL ENG MAINTENANCE DEPT
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