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CN-121203453-B - Multipurpose heat-resistant flame-retardant coating and preparation method thereof

CN121203453BCN 121203453 BCN121203453 BCN 121203453BCN-121203453-B

Abstract

The invention relates to a multipurpose heat-resistant flame-retardant coating and a preparation method thereof, belonging to the technical field of functional coatings. The coating comprises, by mass, 30-40 parts of polymer emulsion, 8-15 parts of composite functional filler, 25-40 parts of flame retardant filler, 1-3 parts of auxiliary agent and 10-20 parts of deionized water. The composite functional filler is prepared by ball milling and compounding surface activated pulp waste residue fibers and choline dihydrogen phosphate, so that a fiber-salt structure is formed, the migration of a flame retardant is effectively inhibited, and the compactness and the fire resistance limit of a carbon layer are improved. The coating has the characteristics of heat resistance, flame retardance, corrosion resistance, excellent mechanical property and the like, the preparation process is green and simple, the recycling of industrial waste residues is realized, and the coating is suitable for the protection requirements of multiple fields such as buildings, new energy sources and the like.

Inventors

  • YU JIEMING
  • SONG XIAODONG
  • ZHAO CHUNXU

Assignees

  • 广州和新实业有限公司

Dates

Publication Date
20260512
Application Date
20251119

Claims (7)

  1. 1. The multipurpose heat-resistant flame-retardant coating is characterized by comprising the following components in parts by weight: 30-40 parts of polymer emulsion; 8-15 parts of composite functional filler; 25-40 parts of flame retardant filler; 1-3 parts of auxiliary agent; 10-20 parts of deionized water; the composite functional filler is prepared by ball milling and compounding surface activated pulp waste residue fibers and choline dihydrogen phosphate; the preparation method of the composite functional filler comprises the following steps: (1) Carrying out surface activation pretreatment on pulp waste residue fibers; (2) Ball milling and compounding the pretreated fiber obtained in the step (1) with choline dihydrogen phosphate; (3) Drying the materials obtained after ball milling to obtain the composite functional filler; The reagent used in the surface activation pretreatment in the step (1) is at least one of an alkaline solution or a silane coupling agent solution; in the step (2), the mass ratio of the pretreated fiber to the choline dihydrogen phosphate is 1:2 to 1:4, the ball milling compounding process parameters are that the ball material ratio is 10:1 to 12:1, the rotating speed is 300-400 rpm, and the time is 45-60 minutes; in the step (2), silane coupling agent accounting for 0.1 to 0.5 percent of the total mass of the composite functional filler is also added during ball milling.
  2. 2. The multipurpose heat-resistant flame-retardant coating according to claim 1, wherein the flame-retardant filler is composed of an acid source, a carbon source and a gas source, wherein the acid source accounts for 45% -55%, the carbon source accounts for 30% -40% and the gas source accounts for 15% -25% based on the total mass of the flame-retardant filler.
  3. 3. The multipurpose heat-resistant flame-retardant coating according to claim 2, wherein the acid source is ammonium polyphosphate, the carbon source is at least one of pentaerythritol, starch or pulp waste residue fibers, and the gas source is at least one of melamine, dicyandiamide or urea.
  4. 4. The multipurpose heat-resistant flame-retardant coating according to claim 1, wherein the polymer emulsion is at least one of styrene-acrylic emulsion, pure acrylic emulsion or silicone-acrylic emulsion, and the auxiliary agent is at least two of dispersing agent, defoaming agent and thickening agent.
  5. 5. The multipurpose heat-resistant flame-retardant coating according to claim 1, wherein the alkaline solution is a sodium hydroxide solution with a mass concentration of 2% -5%, the treatment temperature is 60-80 ℃, and the treatment time is 0.5-2 hours.
  6. 6. The multipurpose heat-resistant flame-retardant coating according to claim 1, wherein in the step (2), nano silicon dioxide accounting for 0.05% -0.3% of the total mass of the composite functional filler is added during ball milling.
  7. 7. A method for preparing the multipurpose heat-resistant flame-retardant coating material according to any one of claims 1 to 6, comprising the steps of: (1) Carrying out surface activation pretreatment on pulp waste residue fibers; (2) Ball milling and compounding the pretreated fiber obtained in the step (1) with choline dihydrogen phosphate; (3) Drying the materials obtained after ball milling to obtain the composite functional filler; (4) Mixing deionized water, an auxiliary agent and a flame-retardant filler, and dispersing to obtain uniform slurry; (5) Adding polymer emulsion into the slurry obtained in the step (4), and uniformly mixing; (6) Adding the composite functional filler prepared in the step (3) into the mixture prepared in the step (5), and mixing and dispersing; (7) And (5) adjusting the viscosity of the paint, and filtering to obtain the paint.

Description

Multipurpose heat-resistant flame-retardant coating and preparation method thereof Technical Field The invention belongs to the technical field of functional coatings, and relates to a multipurpose coating with heat resistance, flame retardance, corrosion resistance and stability and a preparation method thereof. Background The heat-resistant flame-retardant coating is used as a key protective material in the fields of construction, new energy, rail transit and the like, and the development of performance upgrading and greenization of the heat-resistant flame-retardant coating has become a core trend of the industry. Along with the strict implementation of national standards such as building design fireproof standards and the acceleration of new energy infrastructure construction, the market has higher requirements on the high temperature resistance limit, flame retardance durability and environmental protection of the coating. Currently, waterborne intumescent fire-retardant coatings are gradually replacing traditional solvent-based products due to their environmentally friendly nature. However, the prior art still faces two major core challenges, namely that the traditional flame retardant system (such as ammonium polyphosphate APP/pentaerythritol PER/melamine MEL) has moisture absorption and migration problems, so that the fireproof performance is remarkably attenuated along with the storage time, a carbon layer formed at a high temperature is low in strength and easy to crack, and a large amount of composite auxiliary agents are used for realizing multifunctionality, so that the formula is complicated, and the physical and chemical properties and construction adaptability of a coating are affected. The prior art has two major directions, namely, the stability of the flame retardant is improved by means of microcapsule coating, lamellar material intercalation and the like, but the technology is complex and the cost is high, and the industrial solid waste (such as paper pulp waste residue) is recycled and used as a functional filler, but the problems of poor interface compatibility, single function and the like are caused by simple addition. Therefore, the development of the water-based paint system which realizes the stabilization of the flame retardant component through a novel composite technology, has long-acting fireproof and synergistic anti-corrosion functions, accords with the green circulation concept and becomes a target to be broken through in the industry. Disclosure of Invention The invention aims to provide a multipurpose heat-resistant flame-retardant coating and a preparation method thereof, which are used for solving the technical problems that the traditional flame retardant is easy to migrate and the coating function is single. The aim of the invention can be achieved by the following technical scheme: In a first aspect, the invention provides a multipurpose heat-resistant flame-retardant coating, which comprises the following components in parts by mass: 30-40 parts of polymer emulsion; 8-15 parts of composite functional filler; 25-40 parts of flame retardant filler; 1-3 parts of auxiliary agent; 10-20 parts of deionized water; The composite functional filler is prepared by ball milling and compounding surface activated pulp waste residue fibers and choline dihydrogen phosphate. The pulp waste residue fiber is exposed with a large amount of hydroxyl and carboxyl after surface activation, and forms a stable complex with choline dihydrogen phosphate through mechanical force and chemical action in the ball milling process. The fiber is used as a biomass carbon source to promote the formation of a compact carbon layer at high temperature, and the choline dihydrogen phosphate is used as a gas source and an acid source to be heated and decomposed to generate inert gas and catalyze carbonization reaction, so that a gas phase-condensed phase double flame retardant barrier is cooperatively constructed. In addition, the three-dimensional network structure of the fiber firmly anchors the choline dihydrogen phosphate through physical adsorption and chemical bonding (such as hydrogen bond and ionic bond), so that the problem of performance attenuation caused by easy migration and moisture absorption of the traditional flame retardant is fundamentally solved. Preferably, the flame-retardant filler consists of an acid source, a carbon source and a gas source, wherein the acid source accounts for 45% -55%, the carbon source accounts for 30% -40% and the gas source accounts for 15% -25% based on the total mass of the flame-retardant filler. More preferably, the acid source is ammonium polyphosphate (APP), the polyphosphoric acid generated by heating can efficiently catalyze organic matters to dehydrate and carbonize, the carbon source is at least one of pentaerythritol, starch or pulp waste residue fibers, the reuse of the waste residue fibers further enhances the resource circulation, the gas source i