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Short glass fiber reinforced epoxy foam and preparation method thereof

A technology of short glass fiber and chopped glass fiber, which is applied in the field of short glass fiber reinforced epoxy foam and its preparation, which can solve the problems of insufficient temperature resistance, inability to directly foam molding, high cost of PMI foam, etc., and reach the production cycle Short, suitable for large-scale production, low price effect

Pending Publication Date: 2022-07-01
安徽璜峪电磁技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes the deficiencies in the prior art, and provides a kind of epoxy foam and preparation method thereof that foaming manufacturability and cost are equivalent to polyurethane foam, heat resistance and high temperature mechanical properties are equivalent to PMI foam, and the epoxy foam overcomes It overcomes the disadvantages of insufficient temperature resistance of polyurethane foam, the high cost of PMI foam, and the lack of direct foam molding, and has broad application prospects.

Method used

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  • Short glass fiber reinforced epoxy foam and preparation method thereof
  • Short glass fiber reinforced epoxy foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 70kg / m3 foam formula:

[0029] Epoxy resin E-51 100 parts by weight

[0030] Triethylenetetramine curing agent 3 parts by weight

[0031] Isocyanate PAPI 280 parts by weight

[0032] 0.3% of the amount of dibutyltin dilaurate PAPI used

[0033] 3 parts water

[0034] Fumed silica 3% of epoxy resin

[0035] 5% of 3mm chopped glass fiber PAPI

[0036] Preparation Process:

[0037] Step 1: Weigh epoxy resin, add organotin compound, water and curing agent in proportion, stir evenly with a mixer, grind twice with three rollers, and then vacuum degas to obtain mixture A;

[0038] Step 2: Add fumed silica to mixture A, stir it with a mixer until there is no dry powder, and then grind it three times with a three-roller mill. During the grinding process, the distance between the grinding rollers should be controlled to 0.5-1mm to avoid damage to the fumed silica. Vacuum The defoaming port obtains mixture B;

[0039] The third step: weigh the isocyanate, add chopped glass...

Embodiment 2

[0045] 110kg / m3 foam formula:

[0046] Epoxy resin E-51 100 parts by weight

[0047] Triethylenetetramine curing agent 3 parts by weight

[0048] Isocyanate PAPI 280 parts by weight

[0049] 0.3% of the amount of dibutyltin dilaurate PAPI used

[0050] Water 1.5 parts by weight

[0051] Fumed silica 3% of epoxy resin

[0052] 5% of 3mm chopped glass fiber PAPI

[0053] The preparation process and epoxy foam curing system are the same as those in Example 1, and the density, glass transition temperature and mechanical properties of the epoxy foam are shown in Table 2.

Embodiment 3

[0055] 200kg / m3 foam formula:

[0056] Epoxy resin E-51 100 parts by weight

[0057] Triethylenetetramine curing agent 3 parts by weight

[0058] Isocyanate PAPI 300 parts by weight

[0059] 0.3% of the amount of dibutyltin dilaurate PAPI used

[0060] Water 1.5 parts by weight

[0061] Fumed silica 3% of epoxy resin

[0062] 5% of 3mm chopped glass fiber PAPI

[0063] The preparation process and epoxy foam curing system are the same as those in Example 1, and the density, glass transition temperature and mechanical properties of the epoxy foam are shown in Table 2.

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Abstract

The invention provides short glass fiber reinforced epoxy foam and a preparation method thereof. The epoxy foam is prepared from epoxy resin, a curing agent, isocyanate, an organic tin compound, water, fumed silica and chopped glass fibers. Wherein the mass fraction of the epoxy resin is 100, the mass fraction of the amine curing agent is 0.5-10, the mass fraction of the isocyanate is 250-350, the use amount of the organic tin compound is 0.1%-1% of that of the isocyanate, the mass fraction of the water is 0.5-3, the amount of the fumed silica is 0-10% of that of the epoxy resin, and the amount of the chopped glass fiber is 0-20% of that of the isocyanate. The short glass fiber reinforced epoxy foam has the advantages of favorable heat resistance, favorable mechanical properties, excellent foaming manufacturability, low production cost and high cost performance.

Description

technical field [0001] The invention relates to a short glass fiber reinforced epoxy foam and a preparation method thereof, belonging to the technical field of composite materials. Background technique [0002] High-performance foam core materials have been widely used in aerospace and other fields, mainly for weight reduction of products. The core materials currently used are mainly polyurethane foam and polymethacrylimide (PMI) foam. Polyurethane foam is a lightweight core material used in the aerospace field in the early days. It has good mechanical properties at room temperature and low cost. However, this type of foam has poor temperature resistance, and its mechanical retention is greatly reduced when the temperature is higher than 70 °C. , the bearing capacity is basically lost after the temperature is higher than 130 ℃, and its application is limited in the occasions where the long-term use temperature is higher than 70 ℃. PMI foam is a high-performance foam core w...

Claims

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Application Information

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IPC IPC(8): C08G18/58C08K3/36C08K7/14C08J5/04C08G101/00C08L75/04
CPCC08G18/58C08K3/36C08K7/14C08J5/043C08J2375/04
Inventor 夏冰晖夏建军
Owner 安徽璜峪电磁技术有限公司
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