The evolution of waterproof asphalt

Waterproof asphalt is the abbreviation of special asphalt for waterproof membrane and waterproof coating.
It is mainly used as waterproof, moisture-proof and anti-corrosion material in construction engineering, and is used for roofing, underground and other waterproof engineering, anti-corrosion engineering and road engineering.
It is the production of asphalt-based waterproof material.
an important raw material in the process
.
Asphalt-based waterproofing materials mainly include asphalt-based waterproofing membranes, asphalt-based waterproofing coatings (including water-emulsion or solvent-based waterproofing coatings prepared with asphalt as the base material), asphalt-based adhesives and asphalt-based building sealing materials
.
The development of waterproof asphalt in my country has roughly gone through three stages:

The first stage

1950s-60s coatings online at coatingol.
com
.
Due to technical and economic development reasons, China did not start producing asphalt waterproofing materials until the 1940s
.
In the 1950s and 1960s, asphalt-based waterproofing materials mainly included petroleum asphalt paper tire linoleum, coal tar paper tire linoleum and emulsified asphalt waterproof coating
.
Due to the lack of asphalt materials at that time and the backward production process, the earliest impregnating material used as waterproofing membrane was 60#~100# asphalt, and the coating material was mainly 10# asphalt, which was mainly produced by oxidation process.
The process flow is shown in Figure 1.

.

Fig.
1 Distillation-oxidation process flow diagram

It can be seen from Table 1 that the softening point of 10# asphalt is high, and its prominent feature is "hardness", and there is no special requirement for low temperature performance
.
At the same time, because the tail gas generated by the oxidation process is difficult to handle, it will cause serious environmental pollution, which is not in line with the development trend of China's industry.
The oxidation process is gradually being phased out, and the supply of 10# asphalt is greatly reduced
.

Table 1 Technical requirements for construction petroleum asphalt (GB/T 494-2010)

second stage

1980s-90s

The third phase

2000 to present