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Method for preparing internal mold release agent for pulling and extruding glass fiber section bar

A technology for glass fiber reinforced plastic profiles and internal mold release agent, which is applied to the preparation field of internal mold release agent, can solve the problems of air bubbles, difficult operation control, color change, etc. Effect

Inactive Publication Date: 2009-07-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But most of the currently commercially available liquid internal release agents use solid phosphorus pentoxide as a phosphorylation reagent to react with fatty alcohols to prepare alkyl phosphates. This esterification reaction is a heterogeneous solid-liquid reaction, and the reaction is insufficient. There is a little phosphorus pentoxide residue, so they are all acidic, and the pH value is about 1-3, so the following problems may occur in use: (1), when using acid-sensitive pigments, it will cause color changes;( 2) When using basic fillers, such as calcium carbonate, the acid release agent will react with it, causing the viscosity of the mixture to increase, but it will not affect the release effect; (3), if the filler is aluminum hydroxide, In addition to increasing the viscosity of the mixture, the acid release agent will also release water during the curing process of the mixture, causing problems such as air bubbles and cracks
[0006] In addition, the alkyl phosphate internal release agent is prepared by reacting phosphorus pentoxide with fatty alcohol. Because it is a heterogeneous solid-liquid reaction, it is not easy to operate and control, so most of the products are yellow, which limits its use in the production of colorless FRP. used in products
To solve this problem will definitely lead to the complexity of the preparation process and increase the product cost

Method used

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  • Method for preparing internal mold release agent for pulling and extruding glass fiber section bar
  • Method for preparing internal mold release agent for pulling and extruding glass fiber section bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method for an internal mold release agent for pultruded FRP profiles, comprising the steps of:

[0025] 1) Weigh the high-carbon fatty alcohol and phosphorus oxychloride according to the molar ratio of high-carbon fatty alcohol and phosphorus oxychloride as 5.0:1.0, and set aside; the high-carbon fatty alcohol is n-octanol, and the described trichloro Phosphate is analytically pure, with a purity greater than 99% by weight;

[0026] 2) In a four-necked flask equipped with a stirrer, a condenser, and a thermometer, add high-carbon aliphatic alcohol, put the four-necked flask into an ice-water bath, and pass nitrogen protection into the four-necked flask, and start stirring;

[0027] 3) When the temperature of the four-neck flask is lower than 5°C, slowly add phosphorus oxychloride to the high-carbon fatty alcohol through the dropping funnel, and keep stirring while adding, and control the adding speed to 35-45 drops / minute to keep the reaction When the tem...

Embodiment 2

[0030] Embodiment 2: The preparation method is the same as in Example 1, and n-octanol is replaced with a monohydric alcohol mixture containing C8-C12 range (such as the mixture of n-decyl alcohol and lauryl alcohol, and the moles of n-decyl alcohol and lauryl alcohol respectively account for high-carbon fats. 1 / 2 of alcohol). The test results of its basic physical properties are shown in Table 1.

Embodiment 3

[0031] Embodiment 3: The preparation method is the same as that of Embodiment 1. After raising the temperature to 70° C., the absolute pressure of the vacuum degree control system is increased from 5KPa to 3KPa. The test results of its basic physical properties are shown in Table 1.

[0032] Table 1, Basic physical performance test results

[0033]

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PUM

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Abstract

The invention relates to a preparation method of an internal release agent used in pultruded glass reinforced plastic profiles. A method for preparing an internal release agent for pultruded FRP profiles, which is characterized in that the high-carbon fatty alcohol and phosphorus oxychloride are weighed according to the molar ratio of high-carbon fatty alcohol and phosphorus oxychloride as 4.0-7.0: 1.0, and used for future use. ; Using liquid phosphorus oxychloride as a phosphorylation reagent to react with high-carbon aliphatic alcohols to prepare an internal release agent for pultruded FRP profiles. The preparation process of the invention is simple, and the obtained product is a colorless, transparent, nearly neutral liquid with low viscosity at normal temperature.

Description

technical field [0001] The invention relates to a preparation method of an internal release agent used in pultruded glass reinforced plastic profiles. Background technique [0002] The pultrusion molding process of FRP profiles is to let continuous fiber bundles (usually glass fiber, carbon fiber, etc.), felt, etc. pass through a tank filled with resin compound, let it be impregnated with resin, and the compound enters the mold after preforming and heating. The resin compound is cured by heat, then pulled out of the mold and finally cut to the desired length. [0003] The resin compound is mainly composed of unsaturated polyester resin or vinyl resin or epoxy resin. These resins can be heated and cured in the mold together with catalysts and curing agents to form high-strength profiles. During the forming process of the profile, a strong adhesive force will be produced between the formed product and the surface of the mold. In addition, since the pultrusion material enters...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C33/60B29C70/52
Inventor 高山俊沈春晖侯占伟
Owner WUHAN UNIV OF TECH
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