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Preparation method of stable composite modified asphalt

A composite modified asphalt, stabilized technology, applied in the direction of building components, building insulation materials, buildings, etc., can solve the problems of high cost, poor low temperature performance, etc., to achieve the effect of reduced dosage, excellent aging resistance, and reduced collision aggregation

Active Publication Date: 2015-07-01
JIANGSU BAOLI INT INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The third method is to chemically modify SBS in advance to improve the compatibility and compatibility between SBS and asphalt. The problem with this process is that SBS must be modified in advance, and there is a problem of high cost.
There are also many reports on improving the stability of modified asphalt after compounding SBS with carbon black, clay and diatomite and other inorganic materials. Generally, these inorganic materials are added to asphalt to improve the high-temperature performance of asphalt, but it is necessary to add After a certain amount, the modification effect will be obvious, and the amount is too much, resulting in poor low temperature performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Add 30 kg of SBS (1301), reclaimed rubber (variable), and 5 kg of asphalt into an internal mixer mixer at 140°C, knead for 10 minutes, and then extrude through a screw at 140°C for granulation to obtain mixed modifier particles.

[0024] Add the mixed modifier particles into the hot asphalt at 160°C, stir and disperse with a high-speed shear mixer for 20min, and develop with stirring at 200rpm for 2h. The blank sample and 4% SBS modified asphalt were also obtained according to the above processing conditions. The properties of the resulting modified asphalt are as follows:

[0025] Reclaimed rubber dosage Softening point / ℃ Ductility (5°C), before / after aging Viscosity / pa.s(135℃) Softening point of upper layer after storage Softening point of lower layer after storage Resolution / ℃ 0 (blank) 60 31 / 15 1.0 >80 51 >29 0* 72 35 / 16 2.1 73 72 1 2%* 71 30 / 21 2.9 75 75 0 4%* 73 32 / 23 3.0 73 73 0

[0026] Basic fo...

example 2

[0034] Add 30kg of SBS (1301), 30kg of reclaimed rubber, 5kg of asphalt, and 2kg of SEBS-g-MAH into an internal mixer mixer at 140°C, knead for 10 minutes, and then perform single-screw granulation to obtain premix modifier granules .

[0035] A certain amount of mixture modifier particles was added to hot asphalt at 160 °C, stirred and dispersed with a high-speed shear mixer for 30 minutes, and modified asphalt with a SBS content of 3% stabilized with reclaimed rubber was respectively obtained. 4% and 5% SBS modified asphalt were also obtained by the above method. The properties of the resulting modified asphalt are as follows:

[0036] Mixture Modifier Particle Dosage Softening point / ℃ Ductility (5°C), before / after aging Viscosity / cp (135°C) Softening point of upper layer after storage Softening point of lower layer after storage Resolution / ℃ 6% 53 37 / 16 1.1 54 53 1 8% 63 42 / 27 2.8 62 62 0 10% 67 41 / 28 3.4 70 70 0

[...

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PUM

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Abstract

The invention relates to a preparation method of stable composite modified asphalt. The preparation method is characterized in that a styrene-butadiene-styrene block copolymer, reclaimed rubber and a processing agent are premixed by using a macromolecule mixing plant and then are pelletized to obtain mixture modifying agent particles, then the mixture modifying agent particles are subjected to dynamic vulcanization by using high-speed shearing equipment to be processed into micron-size particles, and the micro-size particles are dispersed in matrix asphalt, thus obtaining the finished product. According to the method, the high-temperature storage stability and the ageing resistance of the modification-resistant asphalt with low fragrance parts can be increased.

Description

technical field [0001] The invention relates to a preparation method of stable composite modified asphalt. Background technique [0002] Styrene-butadiene-styrene triblock copolymer (SBS) is a modifier widely used in the modification of petroleum asphalt. SBS can significantly improve the high and low temperature performance and aging resistance of asphalt. SBS-modified asphalt for roads is generally processed with ~4% SBS and asphalt through high-shear equipment to achieve fine dispersion of SBS in asphalt. If the compatibility between SBS and asphalt is poor, SBS is easy to separate and separate from the asphalt. There are a series of problems such as being unable to store for a long time, and the quality is prone to fluctuations, so it is not suitable for large-scale paving construction. [0003] At present, there are three main technologies for producing SBS modified asphalt at home and abroad. One is to disperse SBS into asphalt by high-speed shearing or colloid millin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L53/02C08L17/00C08L57/02C08K5/01C08K3/04C08J11/10B29B7/72B29C47/92B29B9/06B29C48/92
CPCB29C47/92B29C2947/92895B29C47/0011B29C2947/92704B29C48/04B29C48/92B29C2948/92704B29C2948/92895
Inventor 陶红朱亚琴韩君李福建张宇定周德洪东为富
Owner JIANGSU BAOLI INT INVESTMENT CO LTD