TWI465514B - Eraser and its manufacturing method - Google Patents

Description

Eraser and its manufacturing method

The present invention relates to a green eraser and a method of manufacturing the same, and more particularly to an eraser containing a raw plastic material to reduce the amount of petrochemical used and to produce the desired carbon dioxide emissions.

According to the eraser, the eraser is roughly divided into a vinyl chloride eraser composed of a vinyl chloride resin, a non-vinyl chloride eraser composed of a styrene-based thermoplastic elastomer or an olefin-based thermoplastic elastomer, and a natural rubber eraser. kind.

Currently, the market is mainly vinyl chloride erasers and non-vinyl chloride erasers. However, these erasers must use a large amount of increasingly depleted petrochemical resources, and will be accompanied by a large amount of carbon dioxide emissions during the manufacturing process, contrary to the current desire of countries to slow down global warming. The goal of reducing environmental burdens.

While natural rubber erasers can avoid relying on petrochemical products, the effect of erasing is lower than that of general erasers, and the process of vulcanization must be included in the manufacturing process to improve the tensile strength and elasticity of the eraser, but this will not only make the manufacture. The process has become more complicated, and the stench and air pollution problems of the vulcanized exhaust gas will also occur during the manufacturing process.

Therefore, how to effectively reduce the carbon discharge in the eraser manufacturing process and reduce the dependence on petrochemical data under the premise of taking into account the practicality of the eraser is still a technical problem to be solved.

Therefore, in order to reduce the amount of carbon discharged during the manufacturing process of the eraser, the creator has devoted himself to research and developed an eraser comprising: 5% to 50% by weight of the raw plastic material; 10% by weight Up to 65% filler; and 5% to 40% by weight softener.

Further, the raw plastic material is any one of polylactic acid, polyhydroxyalkyl esters, and aliphatic polyester or a mixture thereof.

Further comprising from 1% by weight to 10% by weight of the thermoplastic elastomer.

Further, the thermoplastic elastic system is a polystyrene plastic, and the polystyrene plastic is a styrene-butadiene-styrene block copolymer, a styrene-ethylene, butene-styrene block copolymer. Any or a mixture thereof.

Further, the filler is any one of calcium carbonate, talc, cerium oxide, clay, kaolin or a mixture thereof.

Further, the softening agent is any one of paraffin oil, vegetable oil, and castor oil or a mixture thereof.

Further comprising 2% to 5% by weight of the additive, the aforementioned additive being any one of a slip agent, a dispersant, a titanium dioxide (TiO2), an anti-UV agent, an antioxidant, or a mixture thereof.

A method for manufacturing an eraser is provided, wherein the raw plastic material, the filler and the softener are controlled at a processing temperature of 150 to 180 degrees Celsius for 5 to 20 minutes. The mixed chain of the clock is stirred, followed by extrusion and cooling.

Further, the aforementioned raw plastic material is 5% to 50% by weight.

Further, the raw plastic material is any one of polylactic acid, polyhydroxyalkyl esters, and aliphatic polyester or a mixture thereof.

The invention has the following advantages:

1. Since the main raw material of the eraser of the invention is obtained by fermentation and polymerization of the raw material, the manufacturing process can achieve low energy consumption and low carbon discharge, which is lower than the carbon dioxide emitted by the general petrochemical production.

2. The eraser of the present invention can reduce or even avoid the emission of pollutants such as nitrogen oxides and sulfur oxides discharged in a process such as crude oil refining.

This embodiment is an eraser comprising: 5% to 50% by weight of a raw plastic material, and the aforementioned plastic material is polylactic acid (PLA, Poly Lactide), polyhydroxyalkanoate (PHA, Polyhydroxyalkanoates). And any one or a mixture of aliphatic polyesters (Aliphatic Polyesters); the polylactic acid is a polymer derived from natural cereal crops, which is obtained by fermenting, dewatering, and polymerizing starch extracted from natural cereal crops. The process is manufactured, so the production process consumes less energy than the average traditional plastic (for example: only 1M of PLA needs to produce 58MJ of energy, but PS requires 85MJ of energy, PET/PP/PE requires To 80MJ), there is also a relatively low carbon discharge (for example, 1.8kg CO2 will be produced when 1kg PLA is produced, but 3kg CO2 will be produced by PET.), and the amount of water used is also relatively small (for example, 1kg PLA water consumption) About 50kg, but PS needs 150kg); the polyhydroxyalkyl esters are linear polyesters which are fermented by microbial bacteria after sugar or oily, so that the raw materials and intermediate processes can achieve low energy consumption. And the purpose of low carbon discharge, and the types of the polyhydroxyalkyl esters include: PHA, PHB, PHV, PHBV.

a filler of 5% to 65% by weight, the filler is any one of calcium carbonate, talc, cerium oxide or a mixture thereof, and the filler is used to determine the softness and hardness of the case, and the higher the proportion of addition The harder it is.

A softener of 5% to 4% by weight, the softener is any one of paraffin oil, vegetable oil, castor oil or a mixture thereof, and it is preferred to use vegetable oil derived from raw biomass and castor oil.

1% by weight to 10% to 40% by weight of the thermoplastic elastomer, the thermoplastic elastomer system is a polystyrene-based plastic, and the polystyrene-based plastic is a styrene-butadiene-styrene block copolymer (SBS) , styrene-ethylene, butene-styrene block copolymer (SEBS) or mixtures thereof.

A weight percentage of 2% to 5% of the additive, the aforementioned additive being any one of a slip agent, a dispersant, a titanium dioxide (TiO2), an anti-UV agent, an antioxidant, or a mixture thereof.

The above eraser composition is controlled by a heated kneading machine mixed chain, and is controlled to be mixed for 15 to 20 minutes at a processing temperature of 160 to 180 degrees Celsius, and then pulverized after cooling, and then injection molded. Extrusion molding, etc. The raw eraser of the present invention is obtained by cutting into a predetermined size.

The bottom is processed in one of the composition ratios and the finished product is tested:

Table 1 is a composition ratio table of the eraser of the present invention, which uses 44% by weight of calcium carbonate, 20% by weight of white wax oil, 22% by weight of SEBS, 12% by weight of polylactic acid, and percentage by weight. 0.05% anti-UV agent, 0.05% by weight antioxidant, 0.05% titanium dioxide and 1.85% by weight talc.

The above is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments in accordance with the technical spirit of the present invention are still It is within the scope of the technical solution of the present invention.

Claims (1)

An eraser comprising: 44% by weight of calcium carbonate, 20% by weight of leuco oil, 22% by weight of SEBS, 12% by weight of polylactic acid, 0.05% by weight of anti-UV agent, 0.05% by weight % antioxidant, 0.05% titanium dioxide and 1.85% by weight talc.