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Preparation method for corn stalk/recycling waste plastic pencil

A technology of waste plastic and corn stalks, which is applied in non-mechanical pencils, pen holders, printing and other directions, can solve the problems of user pollution, the bond strength of pencil holders is not disclosed, and the content of adhesives is not specified. low cost effect

Inactive Publication Date: 2011-11-23
匡赞辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Preparation method for corn stalk/recycling waste plastic pencil
  • Preparation method for corn stalk/recycling waste plastic pencil
  • Preparation method for corn stalk/recycling waste plastic pencil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0033] Preparation of isocyanate-terminated polyurethane: Add toluene diisocyanate and castor oil into the reaction kettle, heat to 70-85°C, keep warm for 180min, cool, and discharge;

[0034] The performance tests of the raw materials and products used in Examples 1 to 3 are shown in Table 1.

[0035] Table 1

[0036]

Embodiment 4～21

[0038] Sieve the recycled waste plastics to remove sand, stones and metal solid impurities, and then grind them into smaller than 1cm 2 flakes, spare;

[0039] Drying the corn stalks until the water content is less than 15%, pulverizing, sieving, collecting the whole corn stalk powder with a particle size of less than 40 mesh, and sealing it for later use;

[0040] Add the dry corn stalk powder and flaky waste plastic fragments into a high-speed mixer, then spray the isocyanate adhesive under high pressure, stir and blend at room temperature for 10 minutes, and obtain the spray adhesive blend;

[0041] Fill the spray glue blend into the pencil molding machine, heat press, feed the pen core, cold press, and paint the exterior;

[0042] The detailed raw materials and consumption of each embodiment are shown in Table 2

[0043] Table 2

[0044]

[0045] Note: the preparation method of isocyanate-terminated polyurethane 1 is shown in Example 1,

Embodiment 2

[0047] See Example 3 for the preparation method of isocyanate-terminated polyurethane 3.

[0048] The corn stalk / recycling waste plastic pencil that embodiment 4~21 makes, detects the binding fastness of pen holder according to the light industry standard QB / T2774-2006 of the People's Republic of China: the pencil that makes is immersed in the water surface of (30 ± 2) ℃ 1h, after taking it out, twist the two ends of the pen barrel in reverse, and there is no glue opening phenomenon in the pen barrel, which has reached the pen barrel bonding fastness standard stipulated in QB / T2774-2006; usage habits.

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Abstract

The invention discloses a preparation method for a corn stalk / recycling waste plastic pencil. The preparation method for the corn stalk / recycling waste plastic pencil is characterized by comprising the following steps of: screening sands, pebbles and metallic sold impurities out of waste plastics, and grinding; airing corn stalks, drying, smashing and sieving; mixing the dried corn stalk whole powder and platy waste plastic crushed materials at a high speed, spraying an isocyanate adhesive, stirring and blending; and filling the blended materials subjected to adhesive spraying into a pencil mould press, hot-pressing, feeding a pencil core, cold-pressing, and painting on the outer surface for decoration. The pencil prepared by the method has natural appearance similar to that of wood; a pencil holder has high combination fastness; and the corn stalks and the waste plastics are used for replacing the wood, and raw material resources in China are abundant and has low prices, so that the preparation method has extremely important significance for environment protection in China.

Description

technical field [0001] The invention relates to a preparation method of corn stalks / recycled waste plastic pencils, belonging to the technical field of light industrial products. Background technique [0002] my country has huge corn stalk resources, and the main ways of traditional utilization of corn stalks are: household fuel for farmers; feed for breeding; industrial raw materials such as papermaking. 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, due to the state's forced closure of straw paper mills that have caused serious pollution to the environment, the reduction in corn straw Another important way to use. There is a large amount of surplus corn stalks, which are piled up and burned everywhere, which not only causes a waste of resources, but also directly emits a large amount of carbon dioxide into the ...

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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