Modified hydroxyapatite and application in water-based fireproof coating material

A hydroxyapatite and modified technology, applied in fire-resistant coatings, coatings, fibrous fillers, etc., can solve the problems of low surface activity of hydroxyapatite, limited application effect, difficult interface bonding, etc., and achieve excellent thermal performance. Stability and hydrophobicity, broad application prospects, and the effect of simple preparation methods

Active Publication Date: 2020-06-19
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because hydroxyapatite has good hydrophilicity and is easily soluble in water, when it is used as an inorganic flame retardant in water-based fireproof coatings, there will be problems such as easy precipitation, and it is difficult to have a good interface bond. It also has a great impact on the waterproof performance of fire retardant coatings and other properties under long-term use; in addition, the low surface activity of hydroxyapatite itself further limits its application effect

Method used

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  • Modified hydroxyapatite and application in water-based fireproof coating material
  • Modified hydroxyapatite and application in water-based fireproof coating material
  • Modified hydroxyapatite and application in water-based fireproof coating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A modified hydroxyapatite, the preparation method of which comprises the following steps:

[0033] 1) Add 5g of hydroxyapatite into 100ml of N-N dimethylformamide, ultrasonically disperse in a water bath for 15min at room temperature, and disperse evenly; then add 0.5g of citric acid, and stir in an oil bath at 120°C for 6h. Filter, wash twice with deionized water, and dry under vacuum at 80°C to obtain hydroxyapatite treated with citric acid.

[0034] 2) Weigh 0.5g of aminopropyltriethoxysilane coupling agent and 200ml of absolute ethanol respectively, and ultrasonically disperse in a water bath for 30min at room temperature; then add the obtained hydroxyapatite treated with citric acid in step 1), and Stir in an oil bath at 100°C for 8 hours. After the reaction is complete, filter, wash twice with deionized water, and dry in vacuum at 80°C for 6 hours to obtain the modified hydroxyapatite.

[0035] The modified hydroxyapatite obtained in this embodiment and the unmod...

Embodiment 2

[0042] A modified hydroxyapatite, the preparation method of which comprises the following steps:

[0043] 1) Add 10g of hydroxyapatite to 100ml of N-N dimethylformamide, ultrasonicate in a water bath for 20min at room temperature, and disperse evenly; then add 1g of citric acid, and stir in an oil bath at 120°C for 7h, wait until the reaction is complete, and filter , washed twice with deionized water, and vacuum-dried at 80° C. to obtain hydroxyapatite treated with citric acid.

[0044]2) Weigh 3g of 3-aminopropyltrimethoxysilane and 200ml of absolute ethanol respectively, and ultrasonically disperse in a water bath for 30min at room temperature to disperse evenly; Stir in a bath for 9 hours, and after the reaction is complete, filter, wash twice with deionized water, and vacuum-dry at 80° C. for 6 hours to obtain the modified hydroxyapatite.

[0045] Application example

[0046] The modified hydroxyapatite obtained in this example is used as an inorganic flame retardant ad...

Embodiment 3

[0050] A modified hydroxyapatite, the preparation method of which comprises the following steps:

[0051] 1) Add 8g of hydroxyapatite into 100ml of N-N dimethylformamide, ultrasonically disperse in a water bath for 15min at room temperature, and disperse evenly; then add 1.6g of citric acid, and stir in an oil bath at 110°C for 8h. Filter, wash twice with deionized water, and dry under vacuum at 80°C to obtain hydroxyapatite treated with citric acid.

[0052] 2) Weigh 2g of vinyltrimethoxysilane and 150ml of absolute ethanol respectively, and ultrasonicate in a water bath for 30min at room temperature to disperse evenly; Stir for 10 hours, and after the reaction is complete, filter, wash twice with deionized water, and vacuum dry at 80° C. for 6 hours to obtain the modified hydroxyapatite.

[0053] Application example

[0054] The modified hydroxyapatite obtained in the embodiment is used as an inorganic flame retardant additive to prepare a water-based intumescent fireproof...

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Abstract

The invention discloses modified hydroxyapatite. The preparation method comprises the following steps: pre-treating hydroxyapatite by using citric acid, adding a silane coupling agent, and carrying out a grafting reaction. According to the invention, the modified hydroxyapatite has characteristics of excellent thermal stability, excellent hydrophobicity, good dispersibility and good compatibilitywith a high-molecular polymer; and when the modified hydroxyapatite as an inorganic flame retardant additive is applied to prepare a water-based intumescent fire-retardant coating material, the modified hydroxyapatite can play a flame retardant role in a gas phase and a condensed phase at the same time, promote charring, effectively play a synergistic flame retardant role of an expansion system and modified hydroxyapatite, can significantly improve the water resistance and durability of the coating material, and has a wide application prospect in the aspects of intumescent flame retardant coatings, polymer modification and the like.

Description

technical field [0001] The invention belongs to the technical field of fireproof coatings, and in particular relates to a modified hydroxyapatite and its application in water-based fireproof coatings. Background technique [0002] Hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 , HA) is the main inorganic component of human bones and teeth. It is safe to the human body, has no toxic and side effects, and has excellent biocompatibility. It is widely used in biomedical fields such as bone replacement and plastic surgery, and has broad application prospects. However, due to its poor dispersion, easy agglomeration, hydrophilicity and poor compatibility with polymers, hydroxyapatite also limits its development. Therefore, it is very important to modify the surface of hydroxyapatite. [0003] Patent CN109453432A discloses a polydopamine-modified hydroxyapatite, which can be used for the surface treatment of medical alloy materials; in patent CN103785057B, a click reaction occurs under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/12C09D5/18C09D125/14
CPCC01P2002/82C01P2004/51C01P2006/90C08L2201/02C09C1/02C09C3/006C09C3/08C09C3/12C09D5/18C09D125/14C08K13/06C08K9/04C08K9/06C08K3/32C08K5/053C08K5/34922
Inventor 刘治田刘诗霍思奇
Owner WUHAN INSTITUTE OF TECHNOLOGY
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