Fiber material modified melamine formaldehyde foam and preparation method thereof

A melamine formaldehyde and fiber material technology, applied in the field of melamine formaldehyde foam and its preparation, can solve the problems of undisclosed foam compression set and flame retardancy, low compressive strength, complicated preparation process, etc., and achieves improved utilization value and compression performance. Excellent, the effect of expanding the field of application

Active Publication Date: 2014-09-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But unfortunately, melamine formaldehyde plastic foam has the following disadvantages: poor mechanical properties, brittleness, powder drop, poor flexibility, low compressive strength, etc.
The mechanical properties of the obtained foam material have been improved, and its deformation recovery rate has increased from 88% to more than 90%, reaching a maximum of 99.6%, but the compression set and flame retardancy of the foam are not disclosed
The addition of polyhydroxyl compounds will reduce the flame retardancy of melamine formaldehyde foam, which is undoubtedly contrary to the biggest feature of melamine formaldehyde foam - excellent flame retardancy
That is to say that the improvement of the mechanical properties of the melamine-formaldehyde foam prepared by this method is at the expense of its flame retardancy, which is obviously unfavorable for the application and development of the melamine-formaldehyde foam
[0007] Therefore, it can be seen that the modification research of existing melamine formaldehyde foam has been concentrated on low density (8 ~ 20g / L) melamine formaldehyde foam (i.e. soft foam) aspect, and the prepared melamine formaldehyde foam still exists to varying degrees. Such as high brittleness, poor compression performance, poor flexibility, easy to drop powder, complicated preparation process, and decreased flame retardancy of modified foam, etc.
There is no report on the modification of high-density (30~40g / L) melamine formaldehyde foam (ie rigid foam)

Method used

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  • Fiber material modified melamine formaldehyde foam and preparation method thereof
  • Fiber material modified melamine formaldehyde foam and preparation method thereof
  • Fiber material modified melamine formaldehyde foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) First adjust the pH value of 50ml of formaldehyde solution with a weight concentration of 37% to 8 with an aqueous sodium hydroxide solution (mass concentration of 30%, the same below), and then add 0.15g of unmodified glass with a diameter of 5um and a length of 1mm Fiber, mechanical stirring, after the fiber material is evenly dispersed, add 25g of melamine, react at 90°C for 1 hour, put it in an ice-water bath and cool to room temperature, and obtain the melamine-formaldehyde resin liquid modified with fiber material;

[0043] (2) First add 0.2 part of sodium dodecylbenzenesulfonate, 1 part of n-pentane and 1 part of formic acid into 100 parts of melamine formaldehyde resin liquid modified with fiber materials, and stir at 1500 rpm for 2 minutes to obtain milky white The foaming liquid, then pour the foaming liquid into the mold, foam at 80°C for 10 minutes, and then cure at 150°C for 1 hour.

[0044] The resulting foam density is 40g / L, its compressive strength ...

Embodiment 2

[0046] (1) First adjust the pH value of 25ml of formaldehyde solution with a weight concentration of 37% to 8.5 with sodium hydroxide aqueous solution, then add 0.15g of unmodified asbestos fibers with a diameter of 20um and a length of 2mm, stir mechanically, and wait for the fiber material to disperse evenly Finally, add 25g of melamine, react at 80°C for 2.5h, put it in an ice-water bath and cool it down to room temperature, and then obtain a melamine-formaldehyde resin solution modified with fiber materials;

[0047] (2) First add 0.2 parts of Tween-80, 5 parts of n-pentane and 1 part of acetic acid into 100 parts of melamine-formaldehyde resin liquid modified with fiber materials, and stir at a speed of 2000 rpm for 1 minute to obtain a milky white foaming liquid , and then pour the foaming solution into the mold, foam at 90°C for 8 minutes, and then cure at 180°C for 1 hour.

[0048] The obtained foam has a density of 30g / L, a compressive strength of 58kPa, a deformation...

Embodiment 3

[0050] (1) First adjust the pH value of 30ml of formaldehyde solution with a weight concentration of 37% to 9 with sodium hydroxide aqueous solution, then add 0.45g of unmodified carbon fiber with a diameter of 8um and a length of 3mm, stir mechanically, and wait until the fiber material is evenly dispersed Add 25g of melamine, react at 75°C for 4 hours, put it in an ice-water bath and cool it down to room temperature, and obtain a melamine-formaldehyde resin solution modified with fiber materials;

[0051] (2) First add 0.2 parts of sodium dodecylbenzenesulfonate, 10 parts of n-pentane and 2 parts of formic acid into 100 parts of melamine-formaldehyde resin liquid modified with fiber materials, and stir for 3 minutes at a speed of 1200rpm to obtain milky white The foaming liquid, then pour the foaming liquid into the mold, foam at 100°C for 6 minutes, and then cure at 200°C for 0.5h.

[0052] The obtained foam has a density of 30g / L, a compressive strength of 62kPa, a deforma...

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Abstract

The invention discloses fiber material modified melamine formaldehyde foam. The foam is formed by solution foaming of the following constituents in parts by weight: 100 parts of fiber material modified melamine formaldehyde resin solution, 0.2-8 parts of a surface active agent, 1-30 parts of a foaming agent and 1-10 parts of a curing agent, wherein the content of the fiber material is 0.2-10% of the sum of the mass of the formaldehyde solution and the melamine before polymerization of the resin solution. The invention further discloses a preparation method of the melamine formaldehyde foam. The melamine formaldehyde foam provided by the invention is excellent in fire resistance, and the mechanical properties, such as flexibility and compression strength, of the foam are also improved greatly; and moreover, the preparation method of the foam is simple and easy to carry out, and the production cost is low, large-scale popularization and application of the foam are facilitated.

Description

technical field [0001] The invention belongs to the technical field of melamine formaldehyde foam and its preparation, and in particular relates to a melamine formaldehyde foam modified with fiber materials and a preparation method thereof. Background technique [0002] Melamine formaldehyde foam is a new type of foam with high open cell ratio and low density. It has excellent sound absorption, heat insulation, and is safe and non-toxic. More importantly, compared with traditional foam plastics such as polystyrene and polyurethane, the melamine formaldehyde foam body has excellent flame retardancy, which can completely eliminate fire safety hazards. Therefore, melamine formaldehyde foam has become an ideal environment-friendly flame-retardant building material, and has been widely used in public places, vehicles, road sound insulation, automobile manufacturing, pipeline insulation, railway shipping, aviation industry and other fields. [0003] Unfortunately, melamine-formal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/28C08L67/00C08L77/00C08L1/02C08L89/00C08L27/06C08L33/20C08L29/04C08L23/12C08K9/06C08K7/14C08K7/06C08K7/12C08J9/14
Inventor 王玉忠杨君驰曹志杰陈明军黄鉴前陈力
Owner SICHUAN UNIV
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