KR20010068967A - Sanitary chopping board - Google Patents

Abstract

PURPOSE: A sanitary kitchen board for cooking is provided to be light and durable by using polyurethane. CONSTITUTION: A sanitary kitchen board is made of polyurethane in which isocyanate is reacted with a mixture mixed with polyol and diol at a ratio of 1: 0.2 to 0.4. The average molecular weight of the polyol and the diol is 1000 to 3000 units. The polyol is (PTMG)(HO-(-CH2CH2CH2CH2-O)NH) and the diol is 1,4-HOCH2CH2CH2CH2OH. The isocyanate is 4,4-MDI,OCN-Ph-CH2-Ph-NCO. Thus, the sanitary kitchen board is light and durable.

Description

Sanitary cutting board for cooking {SANITARY CHOPPING BOARD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanitary cutting board for cooking, and more particularly, to a cutting board which is lightweight, hygienic and durable.

Domestic and commercial cutting boards currently used in Korea are usually made of plastic and glass materials made of Chinese wood or polyethylene. However, in addition to the disadvantages of heavy cutting boards, they are hard, and the cutting sound is too loud when cutting or chopping cooking food with a knife on a cutting board or processing other forms.In the case of wood or polyethylene materials, such as knife cuts or grooves, etc. Due to the food or broth is introduced into it can act as a culture of harmful bacteria such as mold. The incoming food residues and bacteria are not easy to remove completely with dish cloths or water, and cause bad smells to damage the taste or flavor of the food.

It is therefore an object of the present invention to provide a cutting board which is light in weight and durable and hygienic.

In order to achieve the above object, the present invention provides a sanitary cutting board prepared by molding a polyurethane obtained by reacting a mixture of polyol and diol with isocyanate.

Hereinafter, the present invention will be described in detail.

The polyol used in the present invention has an average molecular weight in the range of 1,000 to 3,000, and typical examples thereof include polytetramethylene glycol (PTMG) (HO-[-CH ₂ CH ₂ CH ₂ CH ₂ -O] _n H) and the like. Representative examples thereof include 1,4-dibutanediol (HOCH ₂ CH ₂ CH ₂ CH ₂ OH). According to the invention, the polyol component and the diol component are usually mixed in a weight ratio of 1: 0.2 to 1: 0.4, and mixing may be performed at a temperature in the range of 60 to 70 ° C.

Isocyanate component is added to the mixture of the polyol and diol and reacted to obtain a polyurethane according to the present invention. As the isocyanate component, typically 4,4'-diisocyanatophenylmethane (MDI, OCN-Ph-CH) ₂ -Ph-NCO) and the like, and the reaction molar ratio may be similar to that in preparing a conventional urethane, and the reaction temperature is in the range of 40 to 50 ° C.

When an isocyanate component is added to the mixture of the polyol and the diol, an exothermic reaction occurs and the raw material is polymerized to obtain a solid polymer at a temperature in the range of 90 to 95 ° C. The reaction mechanism is shown in Scheme 1 below.

The polymer obtained as described above is aged for stabilization of the polymer for about 2 to 4 weeks at a temperature of about 60 ° C., and then pulverized, extruded, and molded (for example, extrusion or injection molding) to obtain a cutting board according to the present invention. Can be prepared in the desired form.

The cutting board according to the present invention is completely soft, high elasticity, high elasticity, excellent heat resistance, inert (can also be used in boiling water) and harmless to the human body.

Hereinafter, an Example demonstrates this invention, and this Example does not limit this invention.

Example Synthesis of Polyurethane

Based on the weight of the resulting polymer, 50% by weight of polytetramethylene glycol with an average molecular weight of about 1,000 and 15% by weight of 1,4-dibutanediol were mixed at a temperature in the range of 60 to 70 ° C. and then added to the mixture of polyols and diols. 35% by weight of 4,4'-diisocyanatophenylmethane was added and the reaction was initiated in the range of 40 to 50 ° C. to obtain a polyurethane polymer in the solid state at a temperature in the range of 90 to 95 ° C.

Test Example 1

In order to test the hygiene of the polyurethane polymer obtained in the above examples, the contents of lead, cadmium and other heavy metals, evaporation residues and isocyanate contents of the polyurethane resin samples were analyzed according to the corresponding test methods. It is shown in Table 1 below in comparison with the standard.

Test Items Measure standard lead Not detected 10 mg / kg or less cadmium Not detected 10 mg / kg or less Other heavy metals 1.0 mg / l or less as Pb 1.0 mg / l or less as Pb Potassium Permanganate Consumption 3.13 mg / l 10 mg / l or less Evaporation residue 27.5 mg / l 30 mg / l or less Isocyanate Content 0.035 mg / l 0.1 mg / l or less

Test Example 2

Various physical properties were measured for the polyurethane polymer obtained in the above example, and the results are shown in Table 2 below.

Test Items Test Methods Measure importance JIS K 7311 112 Shore A Hardness JIS K 7311 90 100% Modulus (Kgf / cm ² ) JIS K 7311 90 Tensile Strength (Kgf / cm ² ) JIS K 7311 470 Elongation at Break (%) JIS K 7311 480 Tear strength (Kgf / cm) JIS K 7311 125 dynamic stability(%) JIS K 7311 55 Compression set (70 degrees Celsius, 22 hours) (%) JIS K 6301 40 Vicat Softening Point (℃) JIS K 7206 114 Taber wear rate (mg) JIS K 7311 30 Glass transition temperature (℃) Differential Scanning Calorimeter (DSC) 55

The cutting board according to the present invention is mainly composed of polyurethane, which is lightweight, durable and very hygienic.

Claims (2)

A sanitary chopping board formed from polyurethane obtained by reacting isocyanate with a mixture of a polyol having an average molecular weight in the range of 1,000 to 3,000 and a weight ratio in the range of 1: 0.2 to 1: 0.4. The method of claim 1, The polyol is polytetramethylene glycol (PTMG) (HO-[-CH ₂ CH ₂ CH ₂ CH ₂ -O] _n H) and the diol is 1,4-dibutanediol (HOCH ₂ CH ₂ CH ₂ CH ₂ OH) And an isocyanate is 4,4'-diisocyanatophenylmethane (MDI, OCN-Ph-CH ₂ -Ph-NCO).