Preparation method of rubber and plastic compound modified asphalt with stable heat storage

A heat storage stable, modified asphalt technology, applied in the direction of building structure, building components, building insulation materials, etc., can solve the problems of low temperature ductility of modified asphalt, long production cycle, etc., to increase the utilization rate and Effects of reaction speed, increased compatibility, and high fluidity

Inactive Publication Date: 2011-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vulcanization system adopted by CN1837291A has a long production cycle
Low-temperature ductility of modified asphalt prepared by CN1324896A has little improvement

Method used

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  • Preparation method of rubber and plastic compound modified asphalt with stable heat storage
  • Preparation method of rubber and plastic compound modified asphalt with stable heat storage
  • Preparation method of rubber and plastic compound modified asphalt with stable heat storage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] In a small mixer of 3 liters, according to the formula in Table 1, add 2000 g of linear low density polyethylene and 40 g of maleic anhydride, and mix evenly at a low speed. 4 g of dicumyl peroxide were dissolved in 24 g of styrene and added to the mixture of linear low density polyethylene and maleic anhydride. Mix on high speed for 3-5 minutes to obtain a mixture.

[0067] The mixture is added into the feed hopper of the twin-screw extruder, extruded and pelletized in a twin-screw extruder with a screw length-to-diameter ratio of 40:1 and a screw diameter of 20mm, and the host of the twin-screw extruder The rotation speed is 300 rpm, the feeding speed is 40 rpm, and the temperature of each section of the extruder (including 6 sections in total) is 170°C, 180°C, 185°C, 185°C, 180°C, 180°C, Finally, dry the polyethylene graft G1. The graft ratio of graft G1 was 1.39 mmol / 100 g.

[0068] According to formula 1 in Table 2, the temperature of the open mill is first rais...

Embodiment 2

[0071] According to the same processing conditions of Example 1, the graft G2 was prepared according to the formula in Table 1, and the grafting rate of G2 was 1.56mmol / 100g. Different from Example 1, the process of the twin-screw extruder is: the rotating speed of the main engine is 300 rpm, the feeding speed is 60 rpm, and the temperature of each section of the extruder (including 6 sections of the head) is sequentially It is 170°C, 185°C, 190°C, 190°C, 180°C, 175°C. According to the ratio of formula 2 in Table 2, the rubber-plastic composite numbered RPC2 was obtained, and the rubber-plastic composite modified asphalt PMA-2 was obtained according to the ratio of Example 2 in Table 3. The performance test method of modified asphalt is the same as that of Example 1, and the performance of PMA-2 is listed in Table 4.

[0072] Table 1 Formula for the preparation of polyolefin grafts in Examples 1 to 6 (unit: gram)

[0073]

Embodiment 3

[0075] According to the same processing conditions as in Example 1, the graft G1 was obtained according to the formula in Table 1, and the rubber-plastic composite numbered RPC3 was obtained according to the proportion of Formulation 3 in Table 2, and it was prepared according to the proportion of Example 3 in Table 3. Rubber-plastic compound modified asphalt PMA-3. The performance test method of modified asphalt is the same as that of Example 1, and the performance of PMA-3 is listed in Table 4.

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Abstract

The invention discloses a preparation method of a rubber and plastic compound modified asphalt with stable heat storage, comprising the following steps: preparing linear low-density polyethylene graft on a double-screw extruder; on an open mill or an internal rubber mixer, preparing accessory ingredients, such as the polyethylene graft, rubber, an accelerator, an activator, a vulcanizing agent and the like into the rubber and plastic compound by warming, wherein the rubber and plastic compound is a thermoplastic elastomer; heating 100 parts of petroleum asphalt to 150-200 DEG C; adding 3-5 parts of prepared rubber and plastic compound; intensely shearing at high speed by a high-speed emulsification dispersion machine dedicated for preparing the polymer modified asphalt; completely meltingand shearing the rubber and plastic compound; and evenly dispersing asphalt to obtain the rubber and plastic compound modified asphalt. The preparation method is easy to prepare the modified asphalt and only needs to charge once. The prepared modified asphalt consumes a small quantity of vulcanizing agent, has good compatibility of the rubber and plastic compound and the asphalt, stable heat storage, good high-temperature stability and good low-temperature crack resistance and can be used for road paving, buildings, waterproof materials and the like.

Description

technical field [0001] The invention relates to a preparation method of modified asphalt, in particular to a preparation method of rubber-plastic composite modified asphalt which is stable in heat storage, convenient for transportation and storage, and has excellent high and low temperature performance. Background technique [0002] With the development of our country's national economy, the increasing traffic volume, large-scale vehicles and the increase of vehicle axle load have put forward higher requirements for the performance of roads. As an organic cementing material, asphalt has the characteristics of bonding, waterproofing, insulation, shock absorption, etc., and is rich in resources and low in price. It has been widely used for paving roads for a long time. However, as a typical viscoelastic material, asphalt is prone to viscous flow at high temperature (called poor high temperature stability), easy to become brittle and cracked at low temperature (called poor low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L51/06C08L9/06C08L53/02C08L9/00C08F255/02B29B7/28
Inventor 章永化刘宝玉王文志徐美芸蔡炳松
Owner SOUTH CHINA UNIV OF TECH
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