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Preparation method of novel pencil

A pencil, a new type of technology, applied in non-mechanical pencil, pen holder, printing and other directions, can solve the problems of waste of straw resources, traffic and ecological environment pollution, and achieve the effect of low price and huge raw material resources

Inactive Publication Date: 2011-10-05
匡赞辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of straw is left, and it is common to pile up and burn it everywhere, which not only causes waste of straw resources, but also pollutes traffic and the ecological environment

Method used

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  • Preparation method of novel pencil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0031] Add recycled polyethylene terephthalate scraps and diethanolamine to the reaction kettle, stir, heat to 190-220°C, and react for 2 hours to obtain polyester-amide polyol; cool down to 75-80°C, add toluene Diisocyanate was stirred and reacted for 3 hours to obtain an isocyanate-terminated polyurethane adhesive; the raw materials used in Examples 1-3 and the performance tests of the products are shown in Table 1.

[0032] Table 1

[0033]

Embodiment 4～12

[0035] Drying the rice straw, drying until the water content of the rice straw is less than 15%, pulverizing, sieving, collecting the whole rice straw powder with a particle size of less than 20 meshes, and sealing it for later use;

[0036] Add the dried whole rice straw powder into a high-speed mixer, spray the isocyanate adhesive into it under high pressure, stir and blend at room temperature for 10 minutes to obtain a blend;

[0037] Fill the blend into the pencil molding machine, heat press, feed the pen core, cold press, and paint the exterior.

[0038] Table 2

[0039]

[0040] Example 5

[0041] Note: see Example 1 for the preparation method of isocyanate-terminated polyurethane 1;

Embodiment 2

[0042] The preparation method of isocyanate-terminated polyurethane 2 is shown in Example 2;

[0043] See Example 3 for the preparation method of isocyanate-terminated polyurethane 3.

[0044] Embodiment 4~12 makes pencil, detects its pen holder binding fastness according to the light industry industry standard QB / T2774-2006 of the People's Republic of China, all do not open glue, illustrate that the rice straw pencil produced by this patent, the pen holder binding fastness has reached QB / T2774 -Standards stipulated in 2006.

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Abstract

The invention discloses a preparation method of a novel pencil. The method is characterized by comprising the following steps of: drying rice straws, crushing into rice straw whole powder of less than 20 meshes; and mixing an isocyanate adhesive and the rice straw whole powder, hot-pressing a mixed material, putting into a pencil core, and cold-pressing to prepare the pencil. The pencil which is prepared by the method has natural appearance similar to wood; a penholder is high in bonding strength; the wood is replaced by agricultural wastes such as the maize straws; China has abundant raw material resources which are low in cost; and the preparation method has great significance for environmental protection of China.

Description

technical field [0001] The invention relates to a preparation method of a novel pencil, in particular to a preparation method of an agricultural residue rice straw pencil, which belongs to the technical field of light industrial products. Background technique [0002] Pencil is a kind of cultural school supplies commonly used by people. According to reports, my country provides 6 to 7 billion pencils to the world market every year, and is the world's largest exporter of pencils. Wooden pencils are the main type of pencil exports, and the export volume consumes more than 200,000 cubic meters of wood annually. . my country's per capita forest tree share is far lower than the world's average level, ranking 107th in the world. The wood used in wooden pencils is mainly basswood, while my country's basswood species are relatively scarce, and the growth cycle of high-quality basswood is as long as 60 to 70 years. . Therefore, although the export of wooden pencils has been exchange...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43K19/16B43K3/00
Inventor 匡芮
Owner 匡赞辉
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