34results about How to "Good dispersion retention" patented technology

The invention discloses a microcrystalline waterproofing agent for concrete and an application thereof, belonging to the field of concrete additives. In terms of parts by mass, it includes the following components: 1-5 parts of defoaming agent; 2-4 parts of modified silicon dioxide powder; 7-10 parts of waterproofing agent; 0.5-1.5 parts of water reducing agent. In the present invention, by adding a certain amount of defoamer to the microcrystalline waterproofing agent, microcapillary pores with relatively short length and small diameter are formed in the concrete, and at the same time, the surface of the modified silica powder particles has more hydrophobic Sexual groups further strengthen the defoaming and foam stabilizing effects, and reduce the volume of capillary pores that will be formed during the gas discharge process. The tension of the liquid on the surface of these micro pores can effectively prevent the liquid from entering the micro pores, thereby greatly enhancing the waterproof ability of concrete.

The application relates to the field of concrete admixtures, and specifically discloses a slump-preserving concrete admixture, a preparation method thereof, and a super-slump-preserving concrete. A super-slump concrete admixture, comprising the following raw materials in parts by weight: 10-30 parts of amino-terminated methoxy polyethylene glycol, 15-10 parts of methoxy polyethylene glycol, and 50-80 parts of polymethacrylic acid , 20-40 parts of aliphatic hydroxy acid, its preparation method is: take amino-terminated methoxy polyethylene glycol, methoxy polyethylene glycol, polymethacrylic acid and aliphatic hydroxy acid by weighing formula quantity, stir together mixed, heated to 100-110°C for 2-3 hours, and dried to obtain the ultra-slump concrete admixture, adding the super-slump concrete admixture of the present application to the concrete to obtain commercial concrete, which is transported in a high-temperature environment It still has good slump retention performance.

The invention discloses a high-performance reinforcing agent for a pile and a preparation method thereof. The reinforcing agent takes unsaturated acid, urea, TPEG (alkylene polyoxyethylene polyoxypropylene ether) and the like as major chemical synthesis raw materials. Amidation and copolymerization processes are performed under certain condition under the actions of a catalyst, an initiator, a chain transfer agent and the like, so that a high polymer with an amphiphathic structure is obtained. Hydrophilic hydroxyl, carboxyl, amide groups and sulfonic groups, a hydrophobic carbon chain and a polyoxyethylene polyoxypropylene ether long chain structure with a certain steric hindrance effect exist in the molecular structure of the reinforcing agent. The reinforcing agent is suitable for preparing concrete for prestressed high-performance concrete (PHC) pipe piles.

The invention relates to a low molecular weight copolymer dispersant and the preparing method thereof, adopting 40%-70mol% monomer a, 30-60mol% monomer b, 0-15mol% unit c and 0-10mol% monomer d, using water as reaction medium, one-off adding in water soluble initiator and monomer mixture, controlling initial reaction temperature and using a large amount of reaction heat produced in the self-accelerating course of polymerication reaction to fast polymerize the monomer mixture and making it. And it can directly act as dispersant for cement, superfine calcium carbonate, plaster, clay, ceramics and other organic powder, especially for cement-base materials, such as concrete, mortar and grout, having excellent dispersivity and good dispersion retention.

The invention discloses a mixed alcohol polyoxyethylene ether water reducer macromonomer and its preparation method and application. The preparation process of the mixed alcohol polyoxyethylene ether water reducer macromonomer is as follows: under nitrogen atmosphere , Potassium hydroxide, sodium catalyst, methallyl alcohol, prenyl alcohol and ethylene oxide are mixed and stirred to react, and the mixed alcohol polyoxyethylene ether intermediate is synthesized, and the mixed alcohol polyoxyethylene ether intermediate is obtained. Then react with ethylene oxide under a nitrogen atmosphere to synthesize the final product mixed alcohol polyoxyethylene ether, which is a macromonomer used to prepare polycarboxylate water reducers. The mixed alcohol polyoxyethylene ether synthesized by the present invention has both the basic molecular skeleton structure of isopentenol and methallyl alcohol. When the mixed alcohol polyoxyethylene ether product is used to prepare polycarboxylate water reducer , Polycarboxylate superplasticizer is applied to cement, it can maintain the water-reducing performance and at the same time have good dispersion retention.

The invention relates to a preparation method of graphene bonding modified silica fume. The method comprises steps as follows: 1) carboxylated graphene and a silane coupling agent KH550 solution have a reaction under the action of a catalyst, so that coupling modified graphene is obtained; 2) then the coupling modified graphene reacts with the silane coupling agent KH550 solution, and KH550 sol containing the coupling modified graphene is obtained; 3) the KH550 sol reacts with surface hydroxylation modified silica fume, and the graphene bonding modified silica fume can be prepared. The method has the benefits as follows: (1) the strength of cement based composite materials can be significantly enhanced, so that the silica fume has the higher dispersity as well as excellent electrical properties; (2) concrete can have the higher flowing property; (3) the strength (especially the bending strength) of cement concrete can be enhanced, and the toughness of the cement concrete is improved; (4) the application range of the concrete is wider.

The invention discloses a ternary block macromonomer graft copolymerization high-property polycarboxylic acid water-reducing agent and a preparation method thereof. The preparation method comprises the following steps: dissolving a ternary block polyether macromonomer, a non-block polyether macromonomer and maleic anhydride into deionized water; then continuously stirring at a certain temperature, and respectively adding an initiating agent, a reducing agent and a chain transfer agent; and after the reaction is completed, regulating pH to neutrality to obtain the ternary copolymerization high-property polycarboxylic acid water-reducing agent. The water-reducing agent disclosed by the invention can enable the concrete to achieve higher flowing property under the condition of lower water cement ratio; because epoxy propane contained in the ternary block polyether macromonomer has an agglomeration effect and has high space steric effect, the synthesized polycarboxylic acid system water-reducing agent has more excellent dispersing retentivity, the water-reducing agent has lower air content when being used for the concrete, and the water-reducing agent is a multifunctional and high-adaptability high-property water-reducing agent which integrates water reduction, slump loss resistance and low air entrainment into a whole.