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Preparation method of melamine/formaldehyde resin cladded melamine phosphatic microcapsules for fire retardant

A melamine phosphate, melamine technology, applied in the field of materials, can solve the problems of material properties (deterioration of mechanical properties, electrical properties and insulation properties, poor water resistance of polymer materials, poor compatibility with polymers, etc., to achieve good fluidity, prevent The effect of absorbing moisture and agglomerating, improving the performance of moisture and heat resistance

Inactive Publication Date: 2011-11-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature reports (Chemical World, No. 5, 2006, p. 314), intumescent flame retardants (including MP) have the following defects: (1) Poor compatibility with polymers, not easy to disperse evenly in resins, making the material Performance (mechanical properties, electrical properties and insulation properties) decline; (2) easy to absorb moisture, when the product is used in a humid environment, it is easy to migrate to the surface of the resin and ooze out, resulting in poor water resistance of the polymer material, which affects its flame retardant performance to play

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The first step: the preparation of melamine / formaldehyde resin prepolymer:

[0018] Add 18ml 37% formaldehyde aqueous solution, 7g melamine (formaldehyde / melamine molar ratio is 1:4), and 60ml distilled water, 10%Na- 2 CO-- 3 Adjust the pH of the aqueous solution to 8-9. Stir and heat to 70 o C, heat preservation reaction for 0.5 hours to obtain a transparent melamine / formaldehyde resin prepolymer aqueous solution.

[0019] The second step: the preparation of melamine / formaldehyde resin coated MP microcapsules:

[0020] Add 100g MP and 2g sodium lauryl sulfate into 400ml distilled water, stir and disperse for 0.5h, then add the prepolymer of melamine / formaldehyde resin prepared above into the system, continue stirring and dispersing for 0.5h, then raise the temperature to 100°C, react for 2h. Then stop, filter and dry to obtain flame retardant MP microcapsules coated with melamine / formaldehyde resin.

[0021] Step Three: Wash and Dry

[0022] After the above reac...

Embodiment 2

[0024] The first step: the preparation of melamine / formaldehyde resin prepolymer:

[0025] Add 40.5 ml 37% formaldehyde aqueous solution, 21 g melamine (formaldehyde / melamine molar ratio is 1:3), and 180 ml distilled water, 10% Na- 2 CO-- 3 Adjust the pH of the aqueous solution to 8-9. Stir and heat to 70 o C, keep warm for 1 hour to obtain a transparent melamine / formaldehyde resin prepolymer aqueous solution.

[0026] The second step: the preparation of melamine / formaldehyde resin coated MP microcapsules:

[0027] Add 100g MP and 1g gelatin to 300ml ethanol, stir and disperse for 0.5h, then add the melamine / formaldehyde resin prepolymer prepared above into the system, continue stirring and dispersing for 0.5h, raise the temperature to 80°C, and react for 2h . Then stop, filter and dry to obtain flame retardant MP microcapsules coated with melamine / formaldehyde resin.

[0028] Step Three: Wash and Dry

[0029] After the above reaction, the product was filtered with suct...

Embodiment 3

[0031] The first step: the preparation of melamine / formaldehyde resin prepolymer:

[0032] Add 27ml 37% formaldehyde aqueous solution, 21g melamine (formaldehyde / melamine molar ratio is 1:2), and 180ml distilled water, 10%Na- 2 CO-- 3 Adjust the pH of the aqueous solution to 8-9. Stir and heat to 75 o C, heat preservation reaction for 0.5 hours to obtain a transparent melamine / formaldehyde resin prepolymer aqueous solution.

[0033] The second step: the preparation of melamine / formaldehyde resin coated MP microcapsules:

[0034] Add 100g MP and 0.5g OP emulsifier into 200ml methanol, stir and disperse for 0.5h, then add the melamine / formaldehyde resin prepolymer prepared above into the system, continue stirring and dispersing for 0.5h, then raise the temperature to 65°C , Reaction 5h. Then stop, filter and dry to obtain flame retardant MP microcapsules coated with melamine / formaldehyde resin.

[0035] Step Three: Wash and Dry

[0036] After the above reaction, the produ...

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PUM

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Abstract

The invention belongs to the technical field of materials, and specifically relates to a preparation method of melamine / formaldehyde resin cladded melamine phosphatic microcapsules for a fire retardant. The preparation method comprises the following concrete steps of: firstly adding 100g of MP and 0.1-3g of a dispersant into a solvent of 200-500ml, dispersing by stirring for 0.4-0.6 hours, adding a melamine / formaldehyde resin prepolymer into the system, dispersing by incessant stirring for 0.4-0.6 hours, heating up to 60-120 DEG C, reacting for 1-5 hours, filtering and drying to obtain a melamine / formaldehyde resin cladded MP microcapsule powder. The microcapsule coating is compact and uniform with good fluidity and greatly reduced water-solubility, can be used as a fire retardant for high-molecular materials such as polyolefin and nylon, and can be used in the flame retardation for materials such as timber, fabric, paintings and the like.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a preparation method of melamine / formaldehyde resin-coated melamine phosphate (MP) flame retardant microcapsules. Background technique [0002] Intumescent flame retardant (IFR) is usually composed of three parts: carbon source (char forming agent), acid source (dehydrating agent) and gas source (expanding agent). IFR has the advantages of high flame retardant efficiency, low smoke and low toxicity when burning, and is widely used in flame retardant of polymer materials such as coatings, paints, plastics, rubber, and fibers. However, IFR also has defects such as easy moisture absorption and agglomeration, and generally requires surface modification. Microencapsulation is one of the commonly used surface modification methods. The so-called microencapsulation technology uses solid, liquid or gas capsule core material (core material) as the core, and uses natural, se...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K5/3492C08G12/32B01J13/02
Inventor 王正洲徐烁
Owner TONGJI UNIV
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