Modified mullite, water-based intumescent fire retardant coating and preparation methods of modified mullite and water-based intumescent fire retardant coating

A technology of mullite and mullite whiskers, applied in the field of water-based intumescent fire-retardant coatings and their preparation, and modified mullite, can solve the problems of poor organic compatibility and insufficient flame retardancy, and achieve excellent water resistance. , The expanded carbon layer is dense and firm, and the preparation method is simple and easy to implement.

Active Publication Date: 2021-11-19
WUHAN INSTITUTE OF TECHNOLOGY
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, it is necessary to provide a modified mullite, water-based intumescent fireproof coating and its preparation method, in order to solve the lack of flame retardancy of mullite whiskers directly used as flame retardants in the prior art, and Technical problems of poor organic compatibility

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  • Modified mullite, water-based intumescent fire retardant coating and preparation methods of modified mullite and water-based intumescent fire retardant coating

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preparation example Construction

[0019] The first aspect of the present invention provides a kind of preparation method of modified mullite, comprises the following steps:

[0020] S1. Carrying out the first grafting reaction of the flame retardant DOPO and the silane coupling agent to obtain the DOPO grafted silane coupling agent Si-DOPO;

[0021] S2. Coating polydopamine on the surface of mullite whiskers through self-polymerization of dopamine to obtain polydopamine-coated mullite M@PDA;

[0022] S3. Carrying out the second grafting reaction of the DOPO-grafted silane coupling agent Si-DOPO and the polydopamine-coated mullite M@PDA to obtain the modified mullite M@PDA-Si-DOPO.

[0023] The principle of the present invention is: for the shortcomings of traditional water-based intumescent fireproof coatings such as poor water resistance, insufficient intumescent carbon layer, easy cracking and falling off, etc., the present invention selects mullite whiskers with high hardness and high melting point as inorg...

Embodiment 1

[0067] This embodiment provides a water-based intumescent fireproof coating based on modified mullite, wherein the modified mullite is obtained through the following steps:

[0068] (1) Preparation of DOPO grafted silane coupling agent (Si-DOPO): Weigh 1.5g of DOPO and 2g of γ-glycidyl etheroxypropyltrimethoxysilane (molar ratio is about 1:1.2) in a 250mL three-necked flask, The middle indirect condenser tube, the end of the condenser tube is connected with a conduit, the outlet of the conduit is sealed with water, the other side is connected with nitrogen, the last bottle is plugged with a cork, and each plug is sealed with Vaseline oil or raw material tape, and the flask is immersed in a constant temperature Heat the oil bath of the magnetic stirrer; exhaust the air in the device with nitrogen before the reaction starts to ensure that the entire reaction is completed under nitrogen atmosphere; raise the temperature to 40°C, adjust the speed to 500rpm, and stir for 30min to co...

Embodiment 2

[0077] This embodiment provides a water-based intumescent fireproof coating based on modified mullite, wherein the modified mullite is obtained through the following steps:

[0078] (1) Preparation of DOPO grafted silane coupling agent (Si-DOPO): Weigh 1g DOPO and 1.2g γ-aminopropyltriethoxysilane (KH-550) (molar ratio is about 1:1.2) in 250mL In the flask, connect the condensation tube in the middle, connect the tube to the top of the tube, seal the tube outlet with water, connect nitrogen to the other side, and plug the last bottle with a cork. Note that each plug is sealed with Vaseline oil or raw material tape. The flask was immersed in an oil bath with a thermostatically heated magnetic stirrer. Before the reaction starts, the air in the device is exhausted by passing nitrogen gas to ensure that the whole reaction is completed under a nitrogen atmosphere. Adjust the rotation speed to 500 rpm, raise the temperature to 40°C and stir for 30 minutes to completely dissolve DO...

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Abstract

The invention relates to a modified mullite, a water-based intumescent fire retardant coating and preparation methods of the modified mullite and the water-based intumescent fire retardant coating. The mullite is coated with a polydopamine coating layer, the modified mullite is prepared from the rich catechol hydroxyl grafted silane coupling agent and a phosphorus flame retardant DOPO on the coating layer, the modified mullite is applied to the water-based intumescent fire retardant coating, the fire retardant coating is excellent in water resistance, and an intumescent carbon layer is compact and firm; and meanwhile, the preparation method is simple and easy to implement, does not need a large amount of toxic organic solvents, does not need long-time high-power power consumption, conforms to the green, environment-friendly and energy-saving development concepts, and is suitable for popularization and industrial production.

Description

technical field [0001] The invention relates to the technical field of fireproof coatings, in particular to a modified mullite, water-based expansion fireproof coating and a preparation method thereof. Background technique [0002] Due to the problems of volatile organic solvents causing serious pollution to the environment in traditional solvent-intumescent fire retardant coatings, the water-based intumescent fire retardant coatings that have emerged in recent years have become the mainstream fire prevention research due to their advantages of environmental protection, non-toxic safety, and convenient construction. Paint type. However, the current water-based intumescent fire retardant coatings still face disadvantages such as poor water resistance, insufficient firmness of the intumescent carbon layer, and easy cracking and falling off. [0003] In order to solve the above shortcomings and develop fire-resistant coatings with excellent water resistance, fire resistance, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K9/06C08K7/10C09D5/18
CPCC08K9/10C08K9/06C08K7/10C09D5/185
Inventor 张旗杨俊锋舒永俊涂伟强周良志刘治田
Owner WUHAN INSTITUTE OF TECHNOLOGY
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