CN-122011993-A - Splicing adhesive for concrete prefabricated part and preparation method thereof

CN122011993ACN 122011993 ACN122011993 ACN 122011993ACN-122011993-A

Abstract

The invention relates to splice glue for a concrete prefabricated member and a preparation method thereof, and belongs to the technical field of building materials. The splice adhesive disclosed by the invention consists of a component A and a component B, wherein the toughening agent added in the component A is formed by compounding hyperbranched polysiloxane epoxy and modified carbon fiber, crack expansion is restrained by absorbing impact energy, the durability of a material is obviously improved, the ultraviolet aging resistance is improved under the action of the toughening agent and the modified carbon fiber, in addition, the fluorine-based polyether modified polysiloxane is added to reduce the surface tension of the splice adhesive, the splice adhesive can be firmly embedded into interface pores, the occlusion effect between the splice adhesive and concrete is enhanced, and the splice adhesive with good wettability, weather resistance, good mechanical property and no flow is prepared by adjusting the mass ratio between the fluorine-based polyether modified polysiloxane, the silicon micropowder, the toughening agent and calcium carbonate.

Inventors

WANG XIANGHONG
LIU YUCHEN
WANG SHILEI
HUANG LIAO
ZHOU YINGJIE
ZHANG YANWEI

Assignees

湖南中路智固新材料有限公司

Dates

Publication Date: 20260512
Application Date: 20260318

Claims (9)

1. The splice adhesive for the concrete prefabricated part is characterized by comprising, by mass, 100-110 parts of epoxy resin, 5-10 parts of diluent, 12-20 parts of flexibilizer, 3-5 parts of coupling agent, 80-120 parts of filler a, 1-3 parts of thixotropic agent a and 1-2 parts of wetting agent, wherein the raw materials of the component A comprise, by weight, 100-110 parts of curing agent, 3-5 parts of accelerator, 20-30 parts of thixotropic agent B and 70-100 parts of filler B.
2. The splice paste for concrete prefabricated parts according to claim 1, wherein the preparation method of the toughening agent comprises the following steps: (1) Mixing diethylene glycol and a silane coupling agent, adding dimethyl silicone oil, stirring at constant temperature, continuously heating and preserving heat, and then collecting tower bottom liquid for later use through distillation; (2) And (3) putting the carbon fiber into a vacuum drying oven, drying to constant weight, pouring the carbon fiber into absolute ethyl alcohol for dispersion, adding a silane coupling agent, heating, sealing and stirring, filtering, drying the solid to constant weight to obtain powder, and adding the powder into the bottom liquid of the step (1) for heating and stirring to obtain the toughening agent.
3. The splice adhesive for concrete prefabricated parts according to claim 2, wherein the mass ratio of diethylene glycol, silane coupling agent and simethicone in the step (1) is 1-1.5:1:0.3-0.5, the constant temperature stirring temperature, time and rotating speed are respectively 100-120 ℃, 15-30min and 500-700r/min, the heat preservation temperature and time are respectively 130-150 ℃ and 40-60min, and the distillation temperature and time are respectively 65-70 ℃ and 15-20min.
4. The splice adhesive for concrete prefabricated parts according to claim 2, wherein the vacuum drying temperature in the step (2) is 100-120 ℃, the mass ratio of the carbon fiber to the absolute ethyl alcohol to the silane coupling agent is 2-5:10:3-5, the sealing stirring temperature and time are respectively 80-100 ℃ and 2-3h, the mass ratio of the powder to the tower bottom liquid is 1-3:15-20, and the heating stirring temperature and time are respectively 50-60 ℃ and 20-30min.
5. The splice joint glue for concrete prefabricated parts according to claim 2, wherein the filler a is silica micropowder, the thixotropic agent a is hydrophobic fumed silica, the wetting agent is fluorine-based polyether modified polysiloxane, the filler b is calcium carbonate, and the thixotropic agent b is attapulgite.
6. A splice compound for concrete precast elements according to claim 2, characterized in that it is prepared by the steps of: a1, mixing epoxy resin, a diluent, a toughening agent and a wetting agent, and then adding a filler a, a coupling agent and a thixotropic agent a to obtain a component A; a2, firstly mixing a curing agent and an accelerator, then adding a filler B and a thixotropic agent B, mixing and stirring to obtain a component B; A3, when in use, the component A and the component B are uniformly mixed to obtain the splice adhesive.
7. The splice gum for concrete prefabricated parts according to claim 2, wherein the diluent in the step A1 is n-butyl glycidyl ether, and the coupling agent is 3-aminopropyl triethoxysilane.
8. The splice gum for concrete prefabricated parts according to claim 2, wherein the curing agent in the step A2 is an aliphatic amine curing agent, and the accelerator is 2,4, 6-tris (dimethylaminomethyl) phenol.
9. A method for preparing the splice adhesive for concrete prefabricated parts, which is characterized in that the splice adhesive for concrete prefabricated parts is prepared by mixing a component A and a component B according to a mass ratio.

Description

Splicing adhesive for concrete prefabricated part and preparation method thereof Technical Field The invention belongs to the technical field of building materials, and relates to splice glue for a concrete prefabricated member and a preparation method thereof. Background In recent years, prefabricated assembly technologies such as prefabricated section beams, prestressed assembly type pier columns and the like are widely applied in the field of bridge construction, wherein the assembly process is that after concrete sections are prefabricated, the concrete sections are transported, assembled and prestressed into an integral structure, and joints of interface joints of the sections need to be spliced by using clapping splicing glue. The splicing glue is a key material at the joint between the components, plays a role in bonding the connecting segment components and transmitting stress, prevents harmful media from invading to protect the prestressed reinforcement from being corroded, facilitates the lubrication of accurate positioning of component bonding, realizes the assembly effect of the glue joint component equivalent cast-in-situ, and directly influences the reliability and the safety of the whole engineering. Therefore, the high requirements are put on the splicing adhesive, and the high-strength high-elasticity high-shear-resistance high-shear-strength high-elasticity high-shear-resistance high-strength high-thixotropic adhesive has good thixotropic property in vertical construction and long-term use performance of fatigue resistance and freeze thawing resistance. Disclosure of Invention The invention relates to splice glue for a concrete prefabricated member and a preparation method thereof, and belongs to the technical field of building materials. The splice adhesive disclosed by the invention consists of a component A and a component B, wherein the toughening agent added in the component A is formed by compounding hyperbranched polysiloxane epoxy and modified carbon fiber, crack expansion is restrained by absorbing impact energy, the durability of a material is obviously improved, the ultraviolet aging resistance is improved under the action of the toughening agent and the modified carbon fiber, in addition, the fluorine-based polyether modified polysiloxane is added to reduce the surface tension of the splice adhesive, the splice adhesive can be firmly embedded into interface pores, the occlusion effect between the splice adhesive and concrete is enhanced, and the splice adhesive with good wettability, weather resistance, good mechanical property and no flow is prepared by adjusting the mass ratio between the fluorine-based polyether modified polysiloxane, the silicon micropowder, the toughening agent and calcium carbonate. The aim of the invention can be achieved by the following technical scheme: The splice adhesive for the concrete prefabricated part comprises, by mass, 100-110 parts of epoxy resin, 5-10 parts of a diluent, 12-20 parts of a toughening agent, 3-5 parts of a coupling agent, 80-120 parts of a filler, 1-3 parts of a thixotropic agent and 1-2 parts of a wetting agent, wherein the raw materials of the component A comprise, by weight, 100-110 parts of a curing agent, 3-5 parts of an accelerator, 20-30 parts of a thixotropic agent B and 70-100 parts of a filler. Further, the preparation method of the toughening agent comprises the following steps: (1) Mixing diethylene glycol and a silane coupling agent, adding dimethyl silicone oil, stirring at constant temperature, continuously heating and preserving heat, and then collecting tower bottom liquid for later use through distillation; (2) And (3) putting the carbon fiber into a vacuum drying oven, drying to constant weight, pouring the carbon fiber into absolute ethyl alcohol for dispersion, adding a silane coupling agent, heating, sealing and stirring, filtering, drying the solid to constant weight to obtain powder, and adding the powder into the bottom liquid of the step (1) for heating and stirring to obtain the toughening agent. Further, in the step (1), the mass ratio of the diethylene glycol to the silane coupling agent to the dimethyl silicone oil is 1-1.5:1:0.3-0.5, the constant temperature stirring temperature, time and rotating speed are respectively 100-120 ℃, 15-30min and 500-700r/min, the heat preservation temperature and time are respectively 130-150 ℃ and 40-60min, and the distillation temperature and time are respectively 65-70 ℃ and 15-20min. Further, the vacuum drying temperature in the step (2) is 100-120 ℃, the mass ratio of the carbon fiber to the absolute ethyl alcohol to the silane coupling agent is 2-5:10:3-5, the sealing stirring temperature and time are respectively 80-100 ℃ and 2-3h, the mass ratio of the powder to the tower bottom liquid is 1-3:15-20, and the heating stirring temperature and time are respectively 50-60 ℃ and 20-30min. Further, the filler a is silica micropowder, the thixotropic agent a is hyd