Highly filled and highly heat-resistant polyvinyl alcohol-based micro-foaming flame-retardant paper and its thermoplastic processing method

Abstract

The invention discloses high-fill high-heat-resistance polyvinyl alcohol-based microcellular foam type flame retardant paper.The microcellular foam type flame retardant paper is prepared through the steps that polyvinyl alcohol and a plasticizing foaming agent are mixed and swelled and then mixed with an inorganic flame retardant and a flame retardant synergist to obtain composite powder; the composite powder is added into a screw extruder for microcellular foam extrusion, cooling traction, flattening and winding are conducted.The vertical burning class is V-0, the limit oxygen index is 35%-41%, the tensile strength is 1.0-4.5 MPa, the apparent density is 0.05-0.50 g / cm<3>, the average cell diameter is 70-200 micrometers, and the thickness is 0.1-2.0 mm.The flame retardant paper is excellent in thermal resistance, can meet the requirement of rapid laser printing, is excellent in comprehensive performance and low in cost and can be prepared by directly adopting a thermoplastic processing method, the technology is simple and easy to operate, and continuous industrialized production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant paper and its preparation method, and in particular relates to a high-filling, high-heat-resistant polyvinyl alcohol-based micro-foaming type flame-retardant paper and a thermoplastic processing method thereof. Background technique [0002] As we all know, traditional paper is mainly made of plant fibers through processes such as pulping and papermaking. Pulping is to dissociate plant fiber raw materials into natural pulp or bleached pulp by mechanical or chemical methods or a combination of the two; papermaking is to combine pulp fibers suspended in water through certain processing methods to form pulp. Paper that meets various requirements. Although traditional papermaking technology has been widely used, there are still some problems: the process is complicated; in a modern society where wood resources are increasingly scarce, a large amount of forest and grass resources need to be con...

AI Technical Summary

Problems solved by technology

Although traditional papermaking technology has been widely used, there are still some problems: the process is complicated; in a modern society where wood resources are increasingly scarce, a large amount of forest and grass resources need to be consumed, which has caused great harm to nature; most importantly, the traditional A large amount of wastewater generated in the papermaking process has caused serious environmental pollution

[0005] 1. Low softening point and poor heat resistance, not suitable for fast laser printing with large volume and wide area

[0006] Since the polymer resin of conventional synthetic paper mostly uses general-purpose resins such as polyolefin and PVC, its softening temperature is lower than 130°C, and the paper needs to be heated to a high temperature above 170°C to print during the laser printing process, so conventional synthetic paper Difficult to withstand such high temperatures, not suitable for laser printing

[0007] 2. Poor environmental protection, difficult to recycle waste synthetic paper

[0008] The polymer resins used to prepare conventional synthetic paper are mostly polymer materials that are difficult to degrade naturally, and are usually mixed with traditional paper during the waste process, which is not easy to separate, so it is difficult to recycle, and it is also difficult to degrade naturally, and the environmental protection is poor

[0009] 3. Poor flame retardancy

[0014] 2. Because most of the processes such as coating method and dipping method are used, not only the process is complicated, but also not continuous, it is difficult to realize industrial production

[0015] 3. The raw material system is complex. In addition to the base material, other additives such as inorganic fillers, flame retardants, foaming agents and compatibilizers need to be added

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