Abstract:
Provided is a production method for a biodegradable resin using a relatively inexpensive compound as an aromatic dicarboxylic acid compound, wherein, during the process of producing a biodegradable resin in the form of an aliphatic-aromatic polyester copolymer, an aliphatic dihydroxyl compound used as a starting material is used in an amount of between 1 and 1.5 equivalent weight with respect to aliphatic and aromatic dicarboxylic acid compounds. The present invention comprises the steps of: causing a hydroxyl group of the aliphatic dihydroxyl compound to undergo a first reaction with a carboxyl group of the aliphatic dicarboxylic acid compound; and causing the residual hydroxyl group of the aliphatic dihydroxyl compound to undergo a second reaction with a carboxyl group of the aromatic dicarboxylic acid compound. The present invention has the advantage that it is possible to produce the aliphatic-aromatic polyester copolymer biodegradable resin by means of an efficient method while not detracting from the mechanical properties of the biodegradable resin.
Abstract:
본 발명은 재귀반사 기능을 갖는 원단 및 그 제조방법에 관한 것으로, 더욱 상세하게는 재귀반사 합사와 일반 실로 제직되어 이루어지되, 상기 재귀반사 합사는 재귀반사 원사와 두 개의 일반 원사를 합사하여서 되고, 상기 재귀반사 원사는 알루미늄이 증착된 폴리에스테르 필름, 상기 필름의 증착면에 접착되는 글라스 비드 및 상기 글라스 비드를 고정해주는 고분자 코팅층을 포함하는 재귀반사 시트가 0.2~0.4mm의 폭을 갖도록 슬리팅된 것임을 특징으로 한다. 본 발명에 의하면, 비교적 저렴한 가격으로 내구성, 세탁견뢰도 및 야간시인성을 갖는 원단의 제직이 가능하여, 유니폼, 가방, 의류, 부자재 등의 다양한 안전 관련 제품의 생산이 가능하다는 장점이 있다.
Abstract:
PURPOSE: A security door for an entrance is provided to contain objects in the door inside and to enable a user to confirm a visitor without opening the door. CONSTITUTION: A security door for an entrance comprises a body(110), openings(113,118), a transparent plate(120), an opening/closing plate(130) and a driving part(170). An inner plate and an outer plate are separated from one another. The body opens and closes the front door. The opening is penetrated on the top of the inner and outer plates and is corresponded to one another.
Abstract:
PURPOSE: A washing drum for hand-wash is provided to prevent a washboard from being sliding forward by holding the washboard on a support hole. CONSTITUTION: A washing drum for hand-wash comprises a body(100) and a cylindrical seat(200). The body is composed of a container(110) and a supporting plate(130). The seat can be inserted and lead out from the inside of the body. The seat moves back and forth between the supporting plates. The container is opened upward. The supporting plate supports left and right bottom of the container.