32results about How to "Improve low temperature cracking resistance" patented technology

The invention discloses a water-based acrylic elastic emulsion, a preparation method thereof and an application thereof on asphalt pavement, which belongs to the field of chemical industry and solves the problem that cracks are easily formed on asphalt pavement. The present invention comprises 6-7 parts of methyl methacrylate, 3-3.5 parts of threonine, Na 2 CO 3 / NaHCO 3 1.5-2 parts of buffer, 3-5 parts of emulsifier, 3-4 parts of hexadecyl methacrylate, 3-3.5 parts of styrene, 13-13.5 parts of butyl acrylate, 25-26 parts of isooctyl acrylate 3-3.5 parts of glycidyl tert-carbonate, 1-2 parts of benzoyl peroxide, 2-3 parts of tert-butyl benzoyl peroxide, and 30-35 parts of water. Preparation method: prepare acrylic seed emulsion; prepare acrylic pre-emulsion; prepare acrylic elastic emulsion. The invention has uniform and narrow particle size distribution, can be stored at room temperature for 3 years without delamination, and has excellent shear resistance and low temperature resistance.

The invention discloses warm mix asphalt and a preparation method thereof. A formula of the warm mix asphalt comprises a powdered solid material, a branched high-molecular polymer, an oleophylic surfactant, stearic acid and matrix asphalt, wherein the powdered solid material is a separated solid product obtained by conducting oily sludge hot extraction and dewatering technology treatment on oily sludge. According to the warm mix asphalt, all components act synergistically, the effect of additive synergism can be achieved, mixing temperature and forming temperature of a warm mix asphalt mixture prepared form the warm mix asphalt are both lower than 135 DEG C, the warm mix asphalt mixture has the advantages of obviously decreasing the mixing temperature and forming temperature, and various properties of the warm mix asphalt mixture are equivalent to those of hot mix asphalt.

The invention discloses a bituminous mixture warm mixing additive and a preparation method thereof. The bituminous mixture warm mixing additive is prepared from, by weight, 44%-92.5% of powdery solids, 1%-10% of branched polymers, 0.5%-6% of lubrication components, 2%-15% of abietic acid and 4%-25% of stearate. The preparation method comprises the following steps that the powdery solids, the branched polymers, the lubrication components, abietic acid and stearate are put into a screw extruder in proportion and mixed to be uniform, a finished product is extruded and pelleted, and the bituminous mixture warm mixing additive is obtained. According to the bituminous mixture warm mixing additive, the powdery solids generated after extraction treatment of oily sludge are fully recycled and can be used for producing a bituminous mixture by replacing mineral powder, cost is reduced, environmental pollution is reduced, a use method is simple, the application range is wide, and the economization and environmental protection idea is met.

The invention provides an SBS modified asphalt, which is prepared from asphalt, a starlike SBS, a ductility improver and a stabilizing agent, wherein the usage of the starlike SBS is 2.5 to 5 percent of that of the asphalt; the dosage of the ductility improver is 1.0 to 5.0 percent of that of the asphalt; the dosage of the stabilizing agent is 0.5 to 2.0 percent of that of the asphalt; the ductility improver is prepared by stirring rubber softening oil and diethyl phthalate for 0.5 to 1.5 hours at the temperature of between 120 and 140 DEG C; and the stabilizing agent is prepared by stirring an accelerant, namely tetramethyl thiuram monosulfide, and an antioxidant for 0.5 to 1 hour at the temperature of between 65 and 75 DEG C. The asphalt product prepared by the invention has the characteristics of high softening point, great ductility, wide temperature range of application and large elastic restitution, can improve the high temperature anti-deforming capability and the low temperature anti-cracking and fatigue resisting capabilities of a road surface remarkably, and simultaneously improves the temperature stability, the water stability and the durability of the road surface effectively.

The invention discloses a cold-cracking resistant PPR pipeline with a controllable crystal form, and belongs to the technical field of tubular product preparation. The cold-cracking resistant PPR pipeline comprises the following components in parts by weight: 100 parts of PPR, 4 parts of color master batches, 4-6 parts of a cold-cracking resistant modifier, 2-4 parts of a crystal form regulating agent, 1-3 parts of an antioxidant and 0.2-1 part of a light stabilizer, and is obtained by stirring evenly, extruding and pelletizing. The method comprises the following steps: by virtue of a melt extrusion reaction grafting technology, grafting a polyethylene molecule on a polypropylene molecule skeleton as a long-chain tie molecule to obtain a polyethylene cold-cracking resistant modifier; codoping into PPR resin together with the crystal form regulating agent; extruding a PPR modified tubular product; and carrying out internal stress removal treatment on the tubular product. The spherocrystal dimension and distribution of polyethylene in the molding and processing processes can be regulated and controlled by combination of two master batches; the brittleness and stress cracking character of the polyethylene can be significantly improved; and compared with a common PPR tubular product, the cold-cracking resistance can be improved by 20%.