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Direct-adding type instant SBS (Styrene Butadiene Styrene) modifier as well as preparation method and application thereof

A modifier, instant technology, used in building components, building insulation materials, buildings, etc., can solve the softening point and ductility decline of modified asphalt, the large difference in the properties of modified asphalt, and the uneven dispersion of asphalt. problems, to achieve the effect of reducing heating time, overcoming technical defects, saving fuel, energy and processes

Inactive Publication Date: 2015-06-03
BEIJING ZHONGLU PAVING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) SBS is a high-molecular polymer, and the dispersed phase in the asphalt is not uniform, and it is easy to coagulate and precipitate, resulting in a large difference in the properties of the modified asphalt at different parts of the upper and lower parts
There are many studies on the segregation of SBS modified asphalt. Although most of the measures such as adding stabilizers have been taken in production, many projects will encounter segregation due to various technical and management problems in actual application.
[0005] (2) SBS modifier has the problem of thermal decomposition in asphalt (molecules will break and degrade under heat), which leads to the continuous decrease of softening point and ductility of modified asphalt

Method used

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  • Direct-adding type instant SBS (Styrene Butadiene Styrene) modifier as well as preparation method and application thereof
  • Direct-adding type instant SBS (Styrene Butadiene Styrene) modifier as well as preparation method and application thereof
  • Direct-adding type instant SBS (Styrene Butadiene Styrene) modifier as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A kind of direct throw type instant SBS modifier comprises the raw material of following weight portion:

[0045]

[0046] The preparation method of described direct throw type instant type SBS modifier comprises the following steps:

[0047] First, grind the SBS into a powder with a particle size below 120 mesh through a plastic mill. Then, after weighing each material according to the required amount, add it to a high-speed mixer, and mix at a high speed of 500r / min for 5min, and control the mixing temperature below 50°C. The homogeneously mixed materials are fed into the extruder to undergo melt extrusion and granulation. The temperature of the extruder is divided into 7 zones from the feeding section to the die head temperature. The temperature is controlled at 120°C, 145°C, 170°C, 185°C, 190°C, 190°C, and 180°C, and the fluctuation range is ±2°C.

[0048] figure 1 The appearance of the direct-throwing instant SBS modifier prepared for Example 1 of the present...

Embodiment 2

[0051] Same as Example 1, except that the raw material fractions are: 75 parts of SBS; 15 parts of ethylene-vinyl acetate copolymer; 10 parts of naphthenic oil; 2 parts of compatibilizer; 3 parts of antioxidant.

Embodiment 3

[0053] Same as Example 1, except that the raw material fractions are: 75 parts of SBS; 10 parts of ethylene-vinyl acetate copolymer; 10 parts of naphthenic oil; 2 parts of compatibilizer; 3 parts of antioxidant.

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Abstract

The invention discloses a direct-adding type instant SBS (Styrene Butadiene Styrene) modifier prepared from the following raw materials in parts by mass: 60-85 parts of SBS, 5-25 parts of ethylene-vinyl acetate copolymer (EVA), 5-10 parts of naphthenic oil, 1-3 parts of a compatilizer and 2-4 parts of an antioxidant. The SBS modifier disclosed by the invention can be directly added into a blending tower (a process for directly adding the modifier into the blending tower is called a 'dry method' according to industry habits) to quickly melt with an aggregate and base asphalt during short-time mixing, thereby achieving micron-scale dispersion and giving play to a modification effect which is the same as that of a wet method.

Description

technical field [0001] The invention relates to the technical field of modified asphalt. More specifically, it relates to a direct-throwing instant SBS modifier and its preparation method and application. Background technique [0002] SBS is a styrene-butadiene block copolymerized thermoplastic elastomer, which has good processability and good fatigue resistance. Using SBS to modify ordinary petroleum asphalt is the mainstream of asphalt pavement in my country (accounting for about 10% of the modified asphalt market in my country. 90% of) modification technology. [0003] However, because the SBS modifier has a high melting point and is not easy to dissolve and disperse, it is necessary to add the SBS modifier to the base asphalt in the factory first, and use large asphalt shears and colloid mill equipment to process the SBS modifier. Fully grind, disperse and swell to prepare finished SBS modified asphalt (the process of adding this modifier to asphalt in advance is common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/02C08L23/08C08L51/06C08K5/01C08L95/00C04B24/26
Inventor 唐国奇
Owner BEIJING ZHONGLU PAVING TECH
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