Method for reinforcing highly-filled environmental-friendly paper by polyacrylonitrile fiber

Abstract

The invention relates to a method for reinforcing highly-filled environmental-friendly paper by polyacrylonitrile fibers. The method is characterized by comprising the following steps: adding 20 to 25 parts of high density polyethylene, 0.5 to 2.0 parts of polyacrylonitrile fiber and 0.2 to 0.8 part of octadecyl carbamic macrogol ester into an internal mixer, carrying out banburying to raise the temperature to 150 DEG C and keeping constant-temperature processing for 20 minutes, then adding 75 to 80 parts of heavy calcium carbonate, 0.3 to 1.5 parts of sodium polyacrylate powder with a molecular weight of 3,000, 0.2 to 1.0 part of pentaerythrityl tetrastearate and 0.05 to 0.3 part of an antioxygen 1010 into the internal mixer and banburying to raise the temperature to 160 DEGC and keeping constant-temperature processing for 20 minutes; then feeding the material subjected to banburying into an extruder, feeding extruded melt into a calendar by a T-shaped die head and calendaring at a temperature of 140 to 160 DEG C to form a sheet; cooling the sheet discharged from the calendar to a temperature of below 50 DEG C by the air with a relative humidity of 50 to 100 percent; then feeding the sheet into a multi-roller stretcher, firstly preheating the sheet to a temperature of 110 to 130 DEG C and carrying out stretching of 2 to 5 groups to obtain the required environmental-friendly paper.

Description

technical field [0001] The invention relates to a method for reinforcing high-filling environment-friendly paper with polyacrylonitrile fibers. Background technique [0002] In the past, synthetic paper used high molecular polymer as the main raw material, calcium carbonate as the auxiliary raw material, and the calcium carbonate content was less than 40%, so not only the cost was relatively high, but also it was dependent on petroleum, and its development was limited to a certain extent. Recently, this technology has been greatly developed. Calcium carbonate is the main raw material, with a content of up to 80%, and high molecular polymer is an auxiliary raw material, with a content of less than 30%. Through the application of various new technologies, it has both plastic and paper properties. characteristics, but the strength of this environmentally friendly paper is significantly lower than that of synthetic paper in the past. [0003] Chinese invention patent CN10221222...

AI Technical Summary

Problems solved by technology

In order to increase the strength of traditional paper, thick paper and plastic film are generally used, which will inevitably lead to waste of resources, increased costs, and troublesome recycling.

At present, the production methods of environmentally friendly paper are mainly calendering method and film blowing method. The calendering method is stable in process and simple in control, and can produce thick paper of 200-400 μm, but the disadvantage is that there is a large difference in vertical and horizontal strength. Easy to tear; while the blown film method has poor process stability, difficult control, high cost, and immature technology, but the advantage is that the difference in vertical and horizontal strength is small, and thin paper of 100-200 μm can be produced; the present invention adopts the method of adding polypropylene to environmentally friendly paper. Acrylic fiber, using polyacrylonitrile fiber to improve the strength of environmentally friendly paper, improve the poor longitudinal and transverse strength of calendered environmentally friendly paper; because the surface polarity of polyacrylonitrile fiber is strong, while the polarity of high-density polyethylene is very weak, the bonding force between the two Poor, poor compatibility, in order to improve the binding force between polyacrylonitrile fiber and high density polyethylene