Preparation method of novel pencil

Abstract

The invention discloses a preparation method of a novel pencil. The preparation method is characterized by comprising the following steps of: screening sands, stones and metal solid impurities out of waste plastics, and grinding; airing rice straws, drying, crushing and sieving; crushing dried rice straw whole powder and sheet-like waste plastics, mixing at a high speed, spraying an isocyanate adhesive, stirring and mixing; and filling a sprayed adhesive blended material into a pencil mould press, hot-pressing, putting into a pencil core, cold-pressing, and decorating appearance by using paint. A 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 the rice straws and the waste plastics; 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 method for preparing a novel pencil, in particular to a method for preparing an agricultural residue rice straw / waste plastic pencil, belonging to the technical field of light industrial products. Background technique

[0002] my country has huge rice straw resources, and the main ways of traditional utilization of rice straw 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 of rice straw Another important way to use. A large amount of rice straw remains, which is piled up and burned everywhere, which not only causes a waste of resources, but also d...

Examples

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 rice straw, drying until the water content is less than 15%, pulverizing, sieving, collecting the rice straw powder with a particle size of less than 40 mesh, and sealing it for later use;

[0040] Add the dry rice straw powder and flake 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] Example 6

[0046] Note: the preparation method of isocyanate-terminated polyurethane 1 is shown in Exam...

Embodiment 2

[0048] See Example 3 for the preparation method of isocyanate-terminated polyurethane 3.

[0049] The agricultural residue rice straw / 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 (30 ± 2) ℃ of Under the water surface for 1 hour, after taking it out, turn the two ends of the pen holder reversely, and there is no phenomenon of glue opening on the pen holder, which has reached the standard for the fastness of the pen holder specified in QB / T2774-2006; In line with people's usage habits.

technical field

[0001] The invention relates to a method for preparing a novel pencil, in particular to a method for preparing an agricultural residue rice straw / waste plastic pencil, belonging to the technical field of light industrial products. Background technique

[0002] my country has huge rice straw resources, and the main ways of traditional utilization of rice straw 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 of rice straw Another important way to use. A large amount of rice straw remains, which is piled up and burned everywhere, which not only causes a waste of resources, but also d...

Examples

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 rice straw, drying until the water content is less than 15%, pulverizing, sieving, collecting the rice straw powder with a particle size of less than 40 mesh, and sealing it for later use;

[0040] Add the dry rice straw powder and flake 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] Example 6

[0046] Note: the preparation method of isocyanate-terminated polyurethane 1 is shown in Exam...

Embodiment 2

[0048] See Example 3 for the preparation method of isocyanate-terminated polyurethane 3.

[0049] The agricultural residue rice straw / 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 (30 ± 2) ℃ of Under the water surface for 1 hour, after taking it out, turn the two ends of the pen holder reversely, and there is no phenomenon of glue opening on the pen holder, which has reached the standard for the fastness of the pen holder specified in QB / T2774-2006; In line with people's usage habits.

Images