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Preparation method of flame-retardant melamine hard foam

A technology of flame-retardant melamine and rigid foam, which is applied in the field of polymer foam materials to achieve the effects of reducing water absorption and thermal conductivity, improving strength and strong adhesion

Active Publication Date: 2014-12-31
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Publicly published literature such as CN201210328428 discloses a method for preparing closed-cell foam of melamine-formaldehyde resin. The foam prepared by this method has a higher closed-cell rate and oxygen index, and the thermal conductivity is also lower. However, the obtained The foam prepolymer resin is solid and needs to be dissolved by the viscosity adjuster before use, especially the viscosity adjuster is a flammable organic solvent, which reduces the flame retardancy of the foam to a certain extent
In addition, the solid state of its prepolymer also increases the difficulty of its industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 252g of melamine, 75.6g of benzomelamine, 205g of paraformaldehyde, 40g of hydroxyethoxyethyl melamine and 150g of deionized water into a 1L glass flask with stirring, start stirring to mix the materials evenly, and use potassium hydroxide to adjust the pH of the materials to Adjust it to about 9.0, react in a 75°C water bath until the material is clear and transparent, add 25g of dimethyl carbonate, continue the reaction for 1h, and then turn on the vacuum to remove deionized water to obtain 110g of distillate, the material can no longer be stirred normally, add 85.5g to remove Adjust the solid content of the resin to 88% with ionized water, and the viscosity of the resin is 380000cps (25°C), and cool down for later use.

[0020] Get this resin 100g and surfactant sodium dodecylbenzenesulfonate 1.5g, curing agent p-toluenesulfonic acid 5g, blowing agent n-pentane 5g, auxiliary agent silane coupling agent Z6011 (U.S. Dow Corning Chemical Company) 3g in Mix evenly at...

Embodiment 2

[0022] Add 252g of melamine, 75.6g of benzomelamine, 205g of paraformaldehyde, 40g of hydroxyethoxyethyl melamine and 150g of ethanol into a 1L glass flask with stirring, start stirring to mix the materials evenly, and adjust the pH of the materials to 9.0 or so, react in a water bath at 75°C until the material is clear and transparent, add 25g of dimethyl carbonate, continue the reaction for 1 hour and then turn on vacuum to remove ethanol to obtain 132g of distillate, add 63.5g of deionized water to adjust the solid content of the resin to 88 %, the viscosity of the resin is 80000cps (25°C), and it is cooled for later use.

[0023] Get this resin 100g and surfactant sodium dodecylbenzenesulfonate 1.5g, curing agent p-toluenesulfonic acid 5g, blowing agent n-pentane 5g, auxiliary agent silane coupling agent Z6011 (U.S. Dow Corning Chemical Company) 3g in Mix evenly at 1200rpm, pour into a pre-prepared mold, place in an oven at 70°C for foaming for 15 minutes, then transfer to...

Embodiment 3

[0025] Add 252g of melamine, 50.4g of methyl melamine, 213g of paraformaldehyde, 50g of hydroxyethoxyethyl melamine and 150g of ethanol into a 1L glass flask with stirring, start stirring to mix the materials evenly, and use triethanolamine to adjust the pH of the materials to 9.0 React in a water bath at 75°C until the material is clear and transparent, add 35g of ethylene carbonate, continue the reaction for 1 hour, and then turn on vacuum to remove ethanol to obtain 140g of distillate, add 60.4g of deionized water to adjust the solid content of the resin to 89.5%. The viscosity of the resin is 150000cps (25°C), cooled for later use.

[0026] Take 100g of the resin, 1.5g of sodium dodecylbenzenesulfonate as a surfactant, 5g of phosphoric acid (85%) as a curing agent, 5g of n-pentane as a foaming agent, and phenolic foam silicone oil FQ-5502 as an auxiliary agent (Jiangsu Mester Chemical Co., Ltd. Co., Ltd.) 3g was mixed uniformly at 1200rpm, poured into a pre-prepared mold, ...

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Abstract

The invention belongs to the technical field of macromolecular foam materials, and in particular relates to a preparation method of flame-retardant melamine hard foam. The method comprises the steps of performing reaction on melamine and paraformaldehyde according to a mole ratio of 1:(1.5 to 3.5), melamine and a modifier I according to a mass ratio of 1:(0.1 to 0.6) and alcohol serving as a solvent under a water bath of 75 DEG C till the materials are clarified and transparent, adding a modifier II and melamine into resin according to a mass ratio of (0.05 to 0.2):1, continuously performing reaction for 0.5-2 hours, removing the solvent, and adjusting the solid content by water to 85-92 percent to obtain a foam prepolymer. The flame-retardant melamine hard foam prepared by the preparation method disclosed by the invention has the advantages of high compressive strength, high closing rate, excellent flame retardancy and the like, cannot enable powder to fall off and can be applied to the air conditioner air pipe, laminboard and external wall heat preservation material markets.

Description

technical field [0001] The invention belongs to the technical field of polymer foam materials, in particular to a preparation method of flame-retardant melamine rigid foam. [0002] Background technique [0003] In recent years, fires have occurred frequently in the domestic construction field, especially the fires in high-rise buildings have caused great property losses and casualties. One of the reasons is that the flammable external wall insulation materials lead to the rapid spread and expansion of the fire. For this reason, the Ministry of Public Security and the Ministry of Housing and Urban-Rural Development have successively issued a series of documents and notices such as Document No. 46, Document No. 65, and Document No. 350, making clear regulations on the flame retardant performance of external wall insulation materials, and requiring all localities Strictly enforce. However, limited by the nature of the external wall insulation materials themselves, the commo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/14C08L61/32C08G12/40
Inventor 王顺平邓朝元李刚李健干昌舒雷林刘朝慧易江林
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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