Preparation method of hydrophobic modified hydroxyl apatite polyvinyl alcohol composite material

A technology of hydroxyapatite and polyvinyl alcohol, which is applied in the field of preparation of hydrophobically modified hydroxyapatite-polyvinyl alcohol composite materials, which can solve the problem of system uniformity decline, settlement, and influence on the comprehensive performance of polyvinyl alcohol composite materials, etc. problems, to achieve the effect of improving mechanical properties and weather resistance, good water resistance and mechanical properties, and excellent comprehensive performance

Inactive Publication Date: 2017-09-22
倪群
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AI Technical Summary

Problems solved by technology

However, the mechanical properties and water resistance of polyvinyl alcohol are poor, and the application in many fields is greatly restricted.
Although the method of directly adding reinforcing and toughening fillers to polyvinyl alcohol can improve the mechanical properties of polyvinyl alcohol, it is prone to agglomeration and sedimentation, which reduces the uniformity of the system and affects the comprehensive performance of polyvinyl alcohol composites.

Method used

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Embodiment Construction

[0015] A method for preparing a hydrophobically modified hydroxyapatite-polyvinyl alcohol composite material, comprising the following steps:

[0016] (1) Add 15 parts of polyvinyl alcohol solution into the container at 85°C and stir for 10 minutes, then add 3 parts of calcium nitrate solution and mix well, then slowly add diammonium hydrogen phosphate solution to make the calcium-phosphorus ratio 1.67, adjust the pH to 10 and Stir at 40°C for 4h;

[0017] (2) Slowly add a mixture of 0.1 part of silane coupling agent A-151 and 3 parts of absolute ethanol, raise the temperature to 70°C and continue stirring for 4 hours, and obtain hydrophobically modified hydroxyapatite-polyvinyl alcohol composite material after cooling.

[0018] The concentration of the calcium nitrate solution is 0.1mol / L.

[0019] The concentration of the diammonium hydrogen phosphate solution is 0.1mol / L.

[0020] The solid content of the polyvinyl alcohol solution is 3%.

[0021] The stirring speed in s...

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Abstract

The invention discloses a preparation method of a hydrophobic modified hydroxyl apatite polyvinyl alcohol composite material. The preparation method comprises the following steps: mixing a calcium nitrate solution and a diammonium hydrogen phosphate solution in a polyvinyl alcohol solution to in-situ generate nano hydroxyl apatite, then adding an ethanol solution of a silane coupling agent A-151 to realize the in-situ hydrophobic modification on the nano hydroxyl apatite, thus obtaining the composite material. The hydrophobic modified hydroxyl apatite polyvinyl alcohol composite material obtained by the method is good in water resistance and mechanical properties, good in homogeneity and excellent in comprehensive application performance.

Description

technical field [0001] The invention relates to the technical field of polyvinyl alcohol composite materials, in particular to a method for preparing a hydrophobically modified hydroxyapatite-polyvinyl alcohol composite material. Background technique [0002] Polyvinyl alcohol (polyvinyl alcohol), referred to as PVA, is a white flaky, flocculent or powdery solid, odorless, non-toxic, and non-polluting. It is a water-soluble polymer formed by alcoholysis polymerization of vinyl acetate. Its aqueous solution has good adhesion and film-forming properties, and is resistant to most organic solvents such as oils, lubricants and hydrocarbons. Due to its unique strong adhesion, film flexibility, smoothness, oil resistance, solvent resistance and gas barrier properties, PVA is widely used in the production of coatings, adhesives, films and other products, involving textiles, food, agriculture, etc. , construction and other industries, with extremely high use value and commercial pot...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K9/06C08K3/32
CPCC08K9/06C08K3/32C08K2003/325C08K2201/011C08L29/04
Inventor 不公告发明人
Owner 倪群
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