39results about How to "Good flow dispersion" patented technology

The invention provides a ginkgolic acid grafted and modified polycarboxylate water-reducer and a preparation method thereof. The polycarboxylate water-reducer is a random copolymer prepared by polymerizing ginkgolic acid, unsaturated polyether, unsaturated carboxylic acid or salt thereof. The preparation method comprises the following steps: dissolving ginkgolic acid and unsaturated polyether into water; heating the solution to reach the temperature of 20-80 DEG C; then correspondingly dropwise adding the aqueous solution of unsaturated carboxylic acid and the aqueous solution of an initiator and a chain transfer agent for 2-2.5 hours and 3-3.5 hours; continuously reacting for 1 hour under the temperature of 20-80 DEG C after dropwise adding; cooling; neutralizing the system with liquid caustic soda until the pH is 6-7, so as to obtain the ginkgolic acid grafted and modified polycarboxylate superplasticizer. According to the preparation method, unsaturated ginkgolic acid is extracted from waste ginkgo biloba exocarp; carboxyl, hydroxyl and side chain of ginkgolic acid are introduced into a water-reducer molecular structure, therefore, the wastes are treated into treasure on the premise that the performance of the water-reducer is maintained, and as a result, the environment is protected, and the cost of the polycarboxylate water-reducer is decreased.

The invention relates to a hollow microsphere composite modified thermosetting polyimide material and a preparation method thereof. The material is prepared by the following steps: carrying out mechanical blending on the hollow microsphere and a thermosetting polyimide prepolymer according to the mass fraction ratio of (1 to 20 percent) to (99 to 80 percent) and uniformly mixing all parts to obtain a hollow microsphere / thermosetting polyimide prepolymer mixture; carrying out melting and crosslinking treatment on the mixture under high-temperature condition to prepare products such as high temperature resisting parts, adhesives and advanced composite materials. The invention aims at reducing the expensive cost of existing blocked thermosetting polyimide and further improving the comprehensive performance of the material at the same time, in particular to the melting processability of the thermosetting polyimide prepolymer and temperature resistance of cured resin. The hollow microsphere / thermosetting polyimide prepolymer obtained by modifying provided by the invention has the advantages that the cost is reduced; in addition, the melt viscosity can be greatly reduced and the meltingprocessing capacity is enhanced; the temperature resistance of the cured resin is also effectively improved.

Theinvention discloses a microsphere graphene reinforced master batch and a preparation method. In a glass microsphere forming process, graphene adheres to the surface of the glass microsphere, so as to form microsphere graphene with graphene as a wrapping layer and glass microsphere as a core after condensation. The graphene fulfills a higher potential in interface characteristic, further, the graphene and the glass microsphere are combined tightly, so that the microsphere graphene is easy to flow and scatter. The graphene scatters in a sphere state, thereby being prevented from gathering effectively. The microsphere graphene reinforced master batch with a reinforcing function can be obtained by assisting pelletizing of high-molecular polymer. When the microsphere graphene reinforced master batch is used for reinforcing materials like plastics and rubber, the graphene is tightly combined with the glass microsphere so as to scatter in the microsphere state in the system, so that the scattering function is improved substantially; in addition, the graphene fulfills a higher potential in interface characteristic, that is, the graphene can be better wound the plastics and rubber. The preparation method disclosed in the invention is simple, a wide range of raw materials can be used, and the preparation method is contamination-free, is low in cost, and is easy to realize large-scale industrial production.

The invention provides an early-strength polycarboxylate water reducing agent and a preparation method thereof. The water reducing agent comprises the following structural units, wherein R1, R3 and R4 represent hydrogen or methyl; R2 represents-CH2-, -CH2CH2- or -O(CH2)4-; R5 represents dimethylamino, diethylamino group, diisopropylamide or morpholinyl; M1 and M2 represent H or Na; the numerical value of m is between 65 and 115; x, y, z and f represent the average mole numbers of each of the structural units. Compared with a common polycarboxylate water reducing agent, the early-strength polycarboxylate water reducing agent of one embodiment of the invention has longer side chains and a relatively shorter main chain, so that the content of carboxyl groups with delayed coagulation effect is reduced; meanwhile, high fluidity and dispersibility of the water reducing agent can be maintained by polyether structure units with large molecular weight, and the water reducing agent has a good water reducing effect.

The invention relates to a preparation method of graphene reinforced 20CrMnTi alloy steel, belongs to the technical field of metal matrix composite materials, and solves the problems of high preparation cost of graphene and easy agglomeration of graphene in a metal matrix in the prior art. The method for preparing graphene / 20CrMnTi composite material: using cheap expandable graphite and 20CrMnTi powder as raw materials, heating expandable graphite to obtain worm-like expanded graphite; ultrasonically exfoliating in absolute ethanol to obtain graphene suspension, neutralized by acid and alkali Process and centrifugally clean for many times; the centrifuged product is dried and then milled with 20CrMnTi powder to obtain a mixed powder; the graphene / 20CrMnTi dense block material is prepared by a two-step hot pressing sintering method. The graphene of the invention has low preparation cost, simple process, and the graphene is uniformly dispersed in the matrix, can be applied to various steel-based composite materials, and has great significance for promoting the industrial application of the graphene-based steel-based composite material.