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CN-121975261-A - Composite damping emulsion, water-based damping vibration attenuation paint and preparation method thereof

CN121975261ACN 121975261 ACN121975261 ACN 121975261ACN-121975261-A

Abstract

The invention provides a composite damping emulsion, a water-based damping vibration attenuation coating and a preparation method thereof, belonging to the technical field of damping coatings. The composite damping emulsion comprises aqueous polyurethane emulsion and organosilicon modified core-shell type acrylate emulsion, and is synthesized by adopting a seed semicontinuous emulsion polymerization method and introducing organosilicon. The water-based damping vibration attenuation paint comprises 15-100 parts of composite damping emulsion, 20-120 parts of functional filler, 1-6 parts of nanofiber, 5-30 parts of flame retardant, 5-40 parts of deionized water, 0.1-0.6 part of pH regulator and 1.8-15.6 parts of auxiliary agent. The invention provides a double-component composite damping emulsion composed of aqueous polyurethane emulsion and organosilicon modified core-shell acrylate emulsion, which forms a cross-linked network structure, and the double-component composite damping emulsion and functional filler are synergistic, and the functional filler is uniformly dispersed in the emulsion, so that the damping performance of the coating is obviously improved.

Inventors

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Assignees

  • 江西恒大高新技术股份有限公司
  • 江西恒大声学技术工程有限公司

Dates

Publication Date
20260505
Application Date
20260130

Claims (10)

  1. 1. The composite damping emulsion is characterized by comprising aqueous polyurethane emulsion and organosilicon modified core-shell acrylate emulsion; the method adopts a seed semicontinuous emulsion polymerization method and introduces organic silicon to synthesize the organic silicon modified core-shell acrylate emulsion, and comprises the following steps: S1, respectively preparing a core pre-emulsion formed by butyl acrylate, methyl methacrylate, styrene, a solvent and an emulsifier, a shell pre-emulsion formed by butyl acrylate, methyl methacrylate, styrene, acrylic acid, beta hydroxyethyl methacrylate, a cross-linking agent, a solvent and an emulsifier, and an initiation system solution formed by an initiator ammonium persulfate, a buffer sodium bicarbonate and a solvent; S2, taking part of the nuclear pre-emulsion, heating the part of the nuclear pre-emulsion and the part of the initiating system solution in a reactor for reaction to prepare seed emulsion, continuously dripping the rest of the nuclear pre-emulsion and the part of the initiating system solution into the seed emulsion, and carrying out nuclear layer polymerization by heat preservation reaction to obtain nuclear layer emulsion; S3, carrying out shell polymerization by synchronously and continuously dropwise adding the shell pre-emulsion and the rest of the initiating system solution into the core-layer emulsion, dropwise adding a silane coupling agent in the middle and later stages of the shell polymerization, and keeping the temperature and curing after all materials are dropwise added, thereby finally obtaining the organosilicon modified core-shell acrylate emulsion.
  2. 2. The composite damping emulsion according to claim 1, wherein the mass ratio of the aqueous polyurethane emulsion to the organosilicon modified core-shell acrylate emulsion is 1:1-5.
  3. 3. The composite damping emulsion of claim 1, wherein the step of S1 specifically comprises: S11, sequentially weighing 10-25 parts of butyl acrylate, 10-30 parts of methyl methacrylate, 1-5 parts of styrene monomer, 0.1-1 part of emulsifier sodium dodecyl benzene sulfonate, 0.1-0.5 part of emulsifier octyl phenol polyoxyethylene ether OP-10 and 20-50 parts of deionized water, mixing and stirring for 30-40 min, and preparing a core pre-emulsion; S12, weighing 25-40 parts of butyl acrylate, 20-40 parts of methyl methacrylate, 1-5 parts of styrene, 1-4 parts of acrylic acid, 1-5 parts of beta hydroxyethyl methacrylate, 1-3 parts of crosslinking agent divinylbenzene monomer, 0.1-0.2 part of emulsifier sodium dodecyl benzene sulfonate, 0.1-0.5 part of emulsifier octyl phenol polyoxyethylene ether op-10 and 50-100 parts of deionized water, mixing and stirring for 30-50 min, and preparing a shell pre-emulsion; s13, weighing 0.5-1.5 parts of initiator ammonium persulfate and 0.5-1.5 parts of buffer sodium bicarbonate, dissolving in 40-80 parts of deionized water, and uniformly stirring to prepare an initiation system solution.
  4. 4. A composite damping emulsion according to claim 3, characterized in that the step S2 comprises in particular: s21, weighing 20-40 parts of deionized water backing liquid, pouring the deionized water backing liquid into a four-neck flask, then adding 40-60% of nuclear pre-emulsion and 5-8 parts of initiating system solution, heating to 60-100 ℃, stirring and reacting until blue light appears in the flask, and preserving heat for 20-40 min to obtain seed emulsion; S22, dripping the residual nuclear pre-emulsion liquid into the seed emulsion, and simultaneously dripping 6-12 parts of the initiating system solution for 30-50 min, and performing heat preservation reaction for 0.8-1.5 h to obtain the nuclear layer emulsion.
  5. 5. The composite damping emulsion of claim 4, wherein the step of S3 specifically comprises: and synchronously dripping the shell pre-emulsion and the residual initiating system solution into the core layer emulsion, synchronously dripping 0.2-0.5 part of silane coupling agent when the shell pre-emulsion is about 25% -35%, finishing dripping the whole shell pre-emulsion for 1.5-2.5 hours, carrying out heat preservation reaction for 0.8-1.2 hours at 45-60 ℃, cooling the system to room temperature after the reaction is finished, adding a proper amount of ammonia water to adjust the pH value of the system to be neutral, and filtering and discharging by using 100-200 mesh gauze.
  6. 6. The water-based damping vibration attenuation paint is characterized by comprising the following raw material components in parts by weight: 15-100 parts of the composite damping emulsion according to any one of claims 1 to 5; 20-120 parts of functional filler; 1-6 parts of nanofiber; 5-30 parts of flame retardant; 5-40 parts of deionized water; 0.1-0.6 part of pH regulator; 1.8-15.6 parts of auxiliary agent.
  7. 7. The aqueous damping vibration attenuation coating according to claim 6, wherein the auxiliary agent comprises the following components in parts by weight: 0.5-4 parts of dispersing agent; 0.2-0.6 parts of wetting agent; 0.1-2 parts of an anti-aging agent; 0.2-2 parts of defoaming agent; 0.3-2 parts of antifreezing agent; 0.5-5 parts of thickener.
  8. 8. The aqueous damping vibration attenuation coating according to claim 6, wherein the functional filler is at least one of mica powder, calcium carbonate, titanium oxide, vermiculite, wollastonite, and graphite powder; The nanofiber is at least one of polyester fiber, polypropylene fiber and polyethylene fiber, and the length of the nanofiber is1 mm-4 mm; the flame retardant adopts at least one of polymeric brominated flame retardant, aluminum hydroxide and magnesium hydroxide; The pH regulator adopts at least one of 2-amino-2-methyl-1-propanol and dimethylethanolamine.
  9. 9. The aqueous damping vibration attenuation coating according to claim 6, wherein the dispersant is sodium acrylate dispersant; the wetting agent adopts at least one of sodium dodecyl benzene sulfonate and diisooctyl succinate sulfonate; The anti-aging agent adopts at least one of an antioxidant 2246 and an anti-aging agent 4010; The defoaming agent adopts at least one of organic silicon defoaming agents and mineral oil defoaming agents; the antifreezing agent adopts at least one of ethylene glycol and propylene glycol; the thickener adopts at least one of hydroxyethyl cellulose, acrylate thickener and associative polyurethane thickener.
  10. 10. A method of preparing an aqueous damping vibration attenuation coating according to any one of claims 6 to 9, characterized in that the method of preparation comprises the steps of: adding a preset weight of aqueous polyurethane emulsion, an organosilicon modified core-shell acrylate emulsion and deionized water into a water bath reactor, and fully stirring and dispersing for 15-50 min, wherein the water bath temperature is 20-70 ℃ and the stirring speed is 250-650 rpm; then sequentially adding a pH regulator, a dispersing agent, a wetting agent, an anti-aging agent, an antifreezing agent, a part of defoaming agent and a part of thickening agent, and stirring and dispersing for 10-30 min; adding functional filler, flame retardant and nanofiber in the stirring process, and continuing stirring for 20-50 min; And finally, adding the residual defoaming agent and the thickening agent, and continuously stirring for 15-35 min to obtain the water-based damping vibration attenuation paint.

Description

Composite damping emulsion, water-based damping vibration attenuation paint and preparation method thereof Technical Field The invention belongs to the technical field of damping paint, and particularly relates to composite damping emulsion, water-based damping vibration attenuation paint and a preparation method thereof. Background The damping vibration attenuation paint is a functional paint capable of absorbing vibration energy and reducing noise through viscoelastic energy consumption characteristics in materials, and is widely applied to the fields of rail transit (high-speed rail, subway car bodies and interior trim), automobile industry (engine cabins, chassis and car body panels), ships (cabins and decks), buildings (machine rooms, pipelines and walls), mechanical equipment (pump bodies and fans) and the like. The vibration-reducing and noise-reducing material has the core functions of reducing vibration noise, improving equipment operation stability, improving environmental comfort and prolonging the service life of the structure by inhibiting structural vibration transmission and converting vibration energy into heat energy to emit, and is one of key materials for realizing vibration reduction and noise reduction in the modern industry and civil fields. With the increasing of global environmental protection awareness and the increasing of environmental protection regulations of various countries (such as "emission control standards of Volatile Organic Compounds (VOC) of low-VOC content coating products" in China, etc.), the application of the traditional solvent damping vibration attenuation coating is gradually limited because the coating contains a large amount of Volatile Organic Compounds (VOC), which not only causes atmospheric pollution in the production, construction and use processes, but also damages the health of operators. Under the background, the water-based damping vibration attenuation paint has low VOC content, no pungent smell, high safety and environment-friendly trend due to the adoption of water as a dispersion medium, and becomes the main stream direction of industry research and development and application. However, the existing water-based damping vibration attenuation paint still has obvious short plates, namely firstly, the damping performance is insufficient, single resin is mostly adopted, the loss factor is low, the effective damping temperature range is narrow (usually only-10 ℃ to 30 ℃), the environment with extreme temperature difference is difficult to adapt, secondly, the mechanical property and the damping performance are difficult to be compatible, the adhesion force, the water resistance and the weather resistance of a coating are easy to be reduced due to the aid of plasticizers and the like added for improving the damping, cracking and falling occur, thirdly, the construction and storage stability are poor, resin particles and functional fillers are easy to be layered and settled, the drying is slow in a high humidity environment, and air bubbles and shrinkage cavities are easy to form a film. In the prior art, although the improvement is attempted through composite resin and functional filler, the problems of poor compatibility of the composite resin, complex filler dispersion process, high cost, influence of partial auxiliary agents on environmental protection and the like exist, and the synergistic optimization of high damping, wide temperature range, strong mechanical property, high environmental protection and easy construction cannot be realized. Therefore, the research and development of the high-performance water-based damping vibration attenuation paint which has low VOC content, excellent environmental protection, high loss factor, wide damping temperature range, good mechanical property and construction stability is a key for solving the pain point of the industry and meeting the requirements of the high-end field, and has important application value. Disclosure of Invention In view of the above, the invention aims to provide a composite damping emulsion, a water-based damping vibration attenuation coating and a preparation method thereof, which aim to solve at least one technical problem in the background technology. The invention is realized in the following way: The invention provides a composite damping emulsion, which comprises a water-based polyurethane emulsion and an organosilicon modified core-shell type acrylate emulsion, wherein the organosilicon modified core-shell type acrylate emulsion is synthesized by adopting a seed semi-continuous emulsion polymerization method and introducing organosilicon, and comprises the following steps: S1, respectively preparing a core pre-emulsion formed by butyl acrylate, methyl methacrylate, styrene, a solvent and an emulsifier, a shell pre-emulsion formed by butyl acrylate, methyl methacrylate, styrene, acrylic acid, beta hydroxyethyl methacrylate, a cross-linking agent, a solvent and an emulsifier, and