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Preparation method of in-situ hydrophobic modified basic magnesium sulfate whisker

A magnesium sulfate whisker, hydrophobic modification technology, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problem of poor compatibility between whiskers and polymer matrix, poor compatibility and dispersion Uniformity, unsatisfactory enhancement effect, etc., to achieve good hydrophobic effect, complete crystallization, and improved performance

Active Publication Date: 2019-06-25
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the direct addition of MHSHw to the polymer matrix exhibits unsatisfactory reinforcement
There are two main reasons: ①The compatibility of the whiskers with the polymer matrix is ​​not good; ②The whiskers are unevenly dispersed in the matrix
In fact, not only MHSHw, but almost all inorganic fillers (powders) added to polymer or rubber matrices have the problem of inhomogeneous compatibility and dispersion, mainly due to the polarity of the inorganic filler and the polarity of the organic matrix. difference between
Due to the high surface energy of the inorganic powder and the low polymer matrix, the two are difficult to be compatible, resulting in poor performance of the composite material

Method used

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  • Preparation method of in-situ hydrophobic modified basic magnesium sulfate whisker
  • Preparation method of in-situ hydrophobic modified basic magnesium sulfate whisker
  • Preparation method of in-situ hydrophobic modified basic magnesium sulfate whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 A kind of preparation method of in-situ hydrophobically modified basic magnesium sulfate whisker, this method drips ammoniacal liquor in magnesium sulfate solution, then adds liquid fatty acid oleic acid (being called for short OA) as in-situ modifying agent, add-on 0.5vol.% of the volume of the magnesium sulfate solution to obtain an emulsion, add the emulsion into a high-pressure reactor, carry out hydrophobic modification on the basic magnesium sulfate whiskers, and prepare the in-situ hydrophobic modification by hydrothermal synthesis For basic magnesium sulfate whiskers, the temperature of hydrothermal synthesis is 180°C, the time is 5 hours, and the rotation speed is 500r / min.

[0036] Carry out SEM scanning analysis and XRD pattern analysis to the prepared in-situ hydrophobically modified basic magnesium sulfate whisker, obtain as follows figure 2 The SEM images shown and image 3 As shown in the XRD figure, it can be known that the in-situ hydroph...

Embodiment 2

[0038] A kind of preparation method of in-situ hydrophobic modification basic magnesium sulfate whisker, this method drips sodium hydroxide in magnesium sulfate solution, then adds solid fatty acid stearic acid / ethanol (being called for short EtOH) as in-situ modifying agent, Add-on is 1.5vol.% of the magnesium sulfate solution volume, and the volume ratio of solid fatty acid stearic acid and ethanol in the in-situ modifying agent is 1:1, obtains emulsion, and emulsion is added in autoclave, to Basic magnesium sulfate whiskers were hydrophobically modified, and in-situ hydrophobically modified basic magnesium sulfate whiskers were prepared by hydrothermal synthesis. The temperature of hydrothermal synthesis was 200°C, the time was 7 hours, and the rotation speed was 200r / min.

[0039] Carry out SEM scanning analysis and XRD pattern analysis to the prepared in-situ hydrophobically modified basic magnesium sulfate whisker, obtain as follows Figure 4 The SEM images shown and F...

Embodiment 3

[0041] A kind of preparation method of in-situ hydrophobic modification basic magnesium sulfate whisker, this method drips potassium hydroxide in magnesium sulfate solution, then adds palmitic acid / ethylene glycol (being called for short EG) as in-situ modifying agent, adds The amount is 2.5vol.% of the volume of magnesium sulfate solution, and the volume ratio of palmitic acid and ethylene glycol in the in-situ modifier is 1:2 to obtain an emulsion, and the emulsion is added to the autoclave, and the alkali formula The magnesium sulfate whiskers were hydrophobically modified, and the in-situ hydrophobically modified basic magnesium sulfate whiskers were prepared by hydrothermal synthesis. The temperature of the hydrothermal synthesis was 140°C, the time was 1h, and the rotation speed was 700r / min.

[0042] Carry out SEM scanning analysis and XRD pattern analysis to the prepared in-situ hydrophobically modified basic magnesium sulfate whisker, obtain as follows Figure 6 The S...

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Abstract

The invention discloses a preparation method of an in-situ hydrophobic modified basic magnesium sulfate whisker. According to the preparation method, an alkaline solution is dropwise added into a magnesium sulfate solution, then fatty acid or fatty acid / alcohol is added to serve as an in-situ modifying agent to obtain emulsion, and after a hydrothermal reaction is conducted, the in-situ hydrophobic modified basic magnesium sulfate whisker is obtained. By conducting in-situ hydrophobic modification on the basic magnesium sulfate whisker, fatty acid substances such as oleic acid, stearic acid and palmitic acid are adopted to serve as the in-situ modifying agent, the basic magnesium sulfate whisker is directly modified in situ in the preparation process, thus the basic magnesium sulfate whisker has good hydrophobic performance, in the application process, the compatibility with a hydrophobic substrate can be reinforced, and the performance of a composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of functional modification of powder materials, and in particular relates to a preparation method for in-situ hydrophobic modification of basic magnesium sulfate whiskers. Background technique [0002] The most common application field of basic magnesium sulfate whisker (Magnesium Sulfate Whisker, referred to as MHSHw) is the reinforcing filler of thermoplastic resin. However, the direct addition of MHSHw to the polymer matrix exhibits unsatisfactory reinforcement. There are two main reasons: ① the compatibility of the whiskers with the polymer matrix is ​​not good; ② the whiskers are unevenly dispersed in the matrix. In fact, not only MHSHw, but almost all inorganic fillers (powders) added to polymer or rubber matrices have the problem of inhomogeneous compatibility and dispersion, mainly due to the polarity of the inorganic filler and the polarity of the organic matrix. difference between. Due to the hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B7/10
Inventor 黄祖强张燕娟曹小凤胡华宇覃宇奔
Owner GUANGXI UNIV
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