Inorganic powder highly filled polyvinyl alcohol composite material and preparation method thereof

Abstract

The invention discloses an inorganic powder highly filled polyvinyl alcohol composite material, which consists of the following components in parts by weight: 10-60 parts of polyvinyl alcohol, 30-80 parts of inorganic powder, 5-30 parts of plasticizing agent and 5-15 parts of flow modifying agent. Further, the composite material has the tensile strength of 17.0-75.0 MPa and the breaking elongation of 70-450%, and the melt viscosity is 1.0*10<2> to 5.0*10<3> Pa s at 180 DEG C when the shearing rate is 10<2>-10<3> s<-1>. The invention further discloses a preparation method of the inorganic powder highly filled polyvinyl alcohol composite material. By using the inorganic powder highly filled polyvinyl alcohol composite material and the preparation method, not only can inorganic powder highly filled polyvinyl alcohol be realized, the cost of the composite material be greatly reduced, but also the flowability of the composite material can be guaranteed; the favorable thermoplastic processing of the composite material is realized; the obtained composite material is excellent in combination property; products such as a fiber, a sheet and a thin film can be prepared through a routine thermoplastic processing method; and the inorganic powder highly filled polyvinyl alcohol composite material is used for the fields of writing paper, printing paper, instrument and meter packaging films, wallpaper, heat-insulating gaskets, toys and the like. The preparation method provided by the invention is simple in process and short in flow and industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of inorganic powder highly filled polymer composite material and its preparation, and in particular relates to an inorganic powder highly filled polyvinyl alcohol composite material and a preparation method thereof. Background technique [0002] Inorganic powder filled polymer composite material is prepared by mixing inorganic powder and polymer through certain processing technology, and then melt extrusion granulation process. Although the composite material contains a large amount of cheap inorganic powder, which can significantly reduce the material cost, it has been widely used in daily life, home decoration, industrial packaging and other fields, such as "wallpaper" used in home decoration, "wallpaper" in daily life, etc. shopping bags", "stuffed rope" used in cable manufacturing, etc., and can even be used as a substitute for writing pulp paper. Unfortunately, when the content of inorganic powder is h...

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Problems solved by technology

[0003] 1. Inorganic powder needs to be modified on the surface, resulting in complex process and high cost

Due to the weak interaction between untreated inorganic powder and resins such as polyethylene and polypropylene, when the content of inorganic powder is high, its dispersion with the material matrix will become poor, resulting in poor processability and mechanical properties of the material, making it difficult to To meet the application requirements, it is necessary to design and control the interface of the inorganic powder at different levels, and to activate and modify the surface of the inorganic powder through an expensive coupling agent, resulting in an increase in the preparation process and material costs

[0004] 2. Difficult to recycle and recycle, poor environmental friendliness

Since polyethylene, polypropylene, polyvinyl chloride and other resins are not easy to degrade under natural conditions, and the processing performance of inorganic powder high-fill materials is poor, it is difficult to recycle and cause adverse effects on the environment

[0005] 3. Poor printing performance of composite materials

Due to the weak polarity of polyethylene, polypropylene, polyvinyl chloride and other polymer materials, the binding force with printing ink is not good, resulting in poor surface printing performance. Therefore, it is necessary to corona the polymer composite film when it is used in the packaging field Surface treatment to increase the polar groups on the surface of the film to improve its printing performance, which undoubtedly increases the process, increases the cost of materials, and limits its application

[0006] 4. Inorganic powders are limited to non-functional fillers such as calcium carbonate and talcum powder

However, in actual preparation, when the content of inorganic filler is high, it is difficult to achieve good dispersion in the matrix, which will easily lead to a sharp increase in the viscosity of the system, making the melt fluidity worse or even unable to be processed again. Therefore, the existing The research mainly focuses on the thermoplastic processing of pure PVA or the compounding of PVA and low-content inorganic fillers. When the content of inorganic fillers reaches 10-20 parts (CN102134361), it is necessary to add surface modifiers to further improve the dispersion of fillers in the PVA matrix.

So far, there is no report on the preparation of inorganic powder highly filled (filling amount > 30wt%) polyvinyl alcohol composite materials and their products by thermoplastic processing

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