Method for producing agricultural residue wheat straw/waste plastic pencil

Abstract

The invention relates to a method for producing an agricultural residue wheat straw / waste plastic pencil, which is characterized by comprising the steps of sieving sand, gravel and metal solid impurities from waste plastics and grinding; airing, drying, smashing and sieving wheat straws; mixing dried wheat straw whole powder with the sheet waste plastic broken materials at a high speed, spraying an isocyanate adhesive, stirring and blending; and filling the spray gel blending material in a pencil moulding press, hot-pressing, filling in a pencil lead, cold-pressing and decorating the appearance by utilizing paint. The pencil produced by utilizing the method has a nature appearance similar to wood and high penholder bonding fastness; the wood is replaced by the wheat straws and the waste plastics; the raw material resource in our country is vast; and therefore, the price is low and a very important significance is provided for environmental protection of our country.

Description

technical field [0001] The invention relates to a preparation method of agricultural residue wheat straw / waste plastic pencil, which belongs to the technical field of light industrial products. Background technique [0002] my country's wheat area is about 100 million mu, and the annual output of wheat straw is about 100 billion catties. The main ways of traditional utilization of wheat straw in my country are: farmers' household fuel; breeding feed; straw directly returned to the field as fertilizer; papermaking and other industrial raw materials. Due to the gradual improvement of farmers' living standards, the traditional way of using straw as household fuel in rural areas has changed, so the fuel consumption has been significantly reduced; in addition, the country has forcibly closed straw paper mills that have caused serious pollution to the environment, and the use of wheat straw has also been reduced. another important way. It is common for wheat straw to be piled up ...

AI Technical Summary

Problems solved by technology

[0004] The patent application number is CN200710156987.6, which discloses a method for manufacturing pencils from waste paper instead of wood. The steps are: crush the waste paper into powder and mix it with urea-formaldehyde resin adhesive. Mix 28% urea, 0.5% hydrogen dioxide, and 1.5% ammonium chloride (mass ratio), react at 60°C for 5 hours, and then dehydrate 20%. The patent does not specify the content of free formaldehyde in the adhesive, and even urea-formaldehyde resin The content of free formaldehyde is low, and in the process of using the pencil, the cured urea-formaldehyde resin will also release formaldehyde, which will cause pollution to the user; the patent application number is CN01232829.4, which discloses a pencil lead with multiple coils. A method for preparing paper-rolled pencils from layers of waste newspapers. The lead core and each paper layer are bonded and connected with animal glue environmental protection adhesives and food-grade wood additives. The patent does not disclose the specific properties of the adhesive and the bonding strength of the pencil shaft.