Preparation method of low-cost silicon-containing pitch binder
A kind of asphalt bonding, low-cost technology, applied in the direction of asphalt material binder, adhesive, adhesive type, etc., can solve the problems of high preparation cost, difficult dispersion, etc., and achieve the effect of wide application, simple process and easy production
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[0016] A low-cost preparation method of silicon-containing asphalt binder, using lignin / SiO 2 The compound is used as an additive to blend and modify coal tar pitch to prepare low-cost silicon-containing asphalt binder, coal tar pitch and lignin / SiO 2 The mass ratio of the compound is 50-100 parts: 1-50 parts.
[0017] The lignin / SiO 2 The concrete preparation method of compound is:
[0018] Wash the rice husks to remove soil and dust, and dry them at 110°C for 24 hours to obtain dried rice husks; crush the dried rice husks to 60 mesh in a grinder, and then put the crushed rice husks into the air explosion process test The rice husks are gas-exploded on the platform, and the parameters of the gas-explosion process are: temperature (°C): 200-250; pressure (MPa): 2-4; holding time (min): 1-10; Bake the cracking material at 100°C for 24 hours, and the dried cracking material obtained is crushed to 80 mesh in a pulverizer to obtain the prepared lignin / SiO 2 The raw material of...
Embodiment 1
[0022] 1. Lignin / SiO2 2 Complex extraction
[0023] The rice husks were washed to remove soil and dust, and dried at 110° C. for 24 hours to obtain dry rice husks. The dried rice husks are pulverized to 60 meshes in a pulverizer, and then the pulverized rice husks are put into an air explosion process test bench to perform gas explosion on the rice husks. Fill the rice husk into the feed port, compact it, keep the pressure at 200°C for 5 minutes under the vapor pressure of 2.5MPa, and then blast. After blasting, collect explosive materials, dry the explosive materials at 100°C for 24 hours, and crush the dried air-exploded rice husks to 80 mesh to obtain lignin / SiO 2 The raw material of the composite; the raw material is soaked in the container with 72% concentrated sulfuric acid for 24h, then diluted ten times with deionized water, boiled for 1h on the electronic multi-purpose stove, filtered while hot and washed with deionized water until Neutral, dried at 100°C for 24h, ...
Embodiment 2
[0027] Extract lignin / SiO by example 1 2 composite, and then coal tar pitch with lignin / SiO 2 The compound is weighed according to 100:20 (weight ratio), ground, poured into a 100-mesh sieve, sieved and mixed, then loaded into a polymerization reaction vessel, the temperature is raised freely before 100°C, and the temperature is raised at a rate of 5°C / min after 100°C, and Inject N from the beginning of heating 2 , N 2 The flow rate is 50mL / min. When the temperature rises to 160°C, adjust the rotation speed to 5000rpm and stir for 10 minutes to obtain the silicon-containing asphalt binder. The prepared silicon-containing asphalt binder has the following properties: a softening point of 112°C, a carbon residue rate of 67%, and a silicon content of 2.5wt%.
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