KR101083194B1 - 라텍스 분포가 조절된 코팅 구조를 갖는 코팅지 및 제조방법 - Google Patents
라텍스 분포가 조절된 코팅 구조를 갖는 코팅지 및 제조방법 Download PDFInfo
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Abstract
본 발명에서 제시하는 종이 코팅 구조는 입자크기가 70 내지 120 nm, 유리전이온도가 10 내지 30 ℃인 라텍스를 원지쪽 코팅층에 분포시키고, 입자크기가 120 내지 200 nm, 유리전이온도가 -30 내지 0 ℃인 라텍스를 바깥쪽 코팅층에 분포시킴으로써 얻어지는 것을 특징으로 한다.
상기와 같이 다른 종류의 라텍스를 2개의 코팅층에 나누어 적용시 기존의 일반적인 코팅지에 비하여 종이 강직도(stiffness)와 괘선 터짐 현상이 크게 개선되는 효과를 얻을 수 있다.
Description
도 2는 비교예 1에 의해 제조된 코팅지에 대한 괘선 터짐과 괘선 터짐 SEM 사진(x90) 및 접착력을 확인한 사진이다.
구분 | 라텍스 A | 라텍스 B | 라텍스 C | 라텍스 D | 라텍스 E | 라텍스 F |
스티렌 (중량부) | 65 | 69 | 49 | 44 | 65 | 49 |
부타디엔 (중량부) | 31 | 27 | 47 | 52 | 31 | 47 |
도데실디벤젠 술폰산나트륨 (중량부) | 5.5 | 4.5 | 3 | 4 | 3 | 5.5 |
아크릴산 (중량부) | 4 | |||||
t-도데실머캅탄 (중량부) | 0.25 | |||||
칼륨퍼설페이트 (중량부) | 0.9 | |||||
유리전이온도 (℃) | 17 | 25 | -14 | -22 | 17 | -14 |
입자 크기 (nm) | 90 | 110 | 155 | 130 | 155 | 90 |
실시예 No. | 라텍스-1과 라텍스-2의 조합 | 제1/제2코팅층의 두께비 | 라텍스-1 함량 (중량%) |
라텍스-2 함량 (중량%) |
1 | A-C | 0.5 | 9 | 13 |
2 | A-C | 0.8 | 9 | 13 |
3 | A-C | 0.5 | 5 | 13 |
4 | A-C | 0.5 | 9 | 17 |
5 | A-D | 0.5 | 9 | 13 |
6 | B-C | 0.5 | 9 | 13 |
7 | B-D | 0.5 | 9 | 13 |
비교예 No. | 라텍스-1과 라텍스-2의 조합 | 제1/제2코팅층의 두께비 | 라텍스-1 함량 (중량%) |
라텍스-2 함량 (중량%) |
1 | A-C | 1.5 | 9 | 13 |
2 | C-A | 0.5 | 9 | 13 |
3 | C-A | 1.5 | 5 | 13 |
4 | E-F | 0.5 | 9 | 17 |
5 | A-A | 0.5 | 9 | 13 |
6 | C-C | 0.5 | 9 | 13 |
7 | A+C 혼합물로 적용 | - | 9 | 13 |
구분 | 괘선 터짐 면적(%) | 종이 강직도(g) | 접착력(5점법) | 종이 광택(%) |
실시예 1 | 12.7 | 78.5 | 4.5 | 71.8 |
실시예 2 | 20.5 | 81.2 | 4.3 | 72.4 |
실시예 3 | 19.6 | 82.8 | 4.0 | 72.2 |
실시예 4 | 9.3 | 74.0 | 4.7 | 69.5 |
실시예 5 | 9.5 | 70.2 | 4.7 | 68.7 |
실시예 6 | 22.1 | 74.1 | 4.2 | 71.4 |
실시예 7 | 17.1 | 78.2 | 4.5 | 68.9 |
비교예 1 | 38.5 | 85.9 | 3.5 | 72.2 |
비교예 2 | 51.1 | 86.5 | 3.5 | 73.7 |
비교예 3 | 43.0 | 62.8 | 4.5 | 73.7 |
비교예 4 | 35.4 | 60.0 | 4.6 | 68.8 |
비교예 5 | 72.6 | 88.2 | 3.0 | 74.0 |
비교예 6 | 24.0 | 54.4 | 4.8 | 68.2 |
비교예 7 | 49.5 | 80.3 | 4.0 | 72.7 |
Claims (16)
- 안료, 보조안료 및 스티렌-부타디엔 라텍스로 이루어진 종이 코팅용 도공액을 사용하여 코팅된 코팅지에 있어서,
상기 코팅지는 상기 스티렌-부타디엔 라텍스로서 입자크기와 유리전이온도가 상이한 라텍스를 적용한 프리 코팅층과 탑 코팅층을 원지 상에 순차적으로 형성시킨 총 2층의 코팅 구조로 이루어지고,
상기 2층의 코팅 구조는 원지에 프리 코팅층으로서 제1 코팅층을 도포하고 건조한 다음 탑 코팅층으로서 제2 코팅층을 도포하고 건조하여 형성되며,
상기 제1 코팅층 대 제2 코팅층의 두께 비율은 0.1 내지 1.0이고, 상기 제1 코팅층과 제2 코팅층의 총 두께는 20 내지 60 ㎛인 것을 특징으로 하는 코팅지. - 삭제
- 제 1항에 있어서,
상기 제1 코팅층은 입자 크기가 70 내지 120 nm이고 유리전이온도가 10 내지 30 ℃인 라텍스가 포함된 도공액을 사용하여 형성된 것을 특징으로 하는 코팅지. - 제 1항에 있어서,
상기 제 2 코팅층은 입자 크기가 120 내지 200 nm이고 유리전이온도가 -30 내지 0 ℃인 라텍스가 포함된 도공액을 사용하여 형성된 것을 특징으로 하는 코팅지. - 제 3 항 또는 제 4 항에 있어서,
상기 도공액은 안료 및 보조안료 100 중량부를 기준으로 스티렌-부타디엔계 라텍스 5 내지 20 중량부와 증점제 0.1 내지 9 중량부를 배합하여 이루어지는 것을 특징으로 하는 코팅지. - 삭제
- 제 1항에 있어서,
상기 제1 코팅층 내 라텍스 함량은 제1 코팅층 내 총 고형분을 기준으로 3 내지 15 중량% 범위 내인 것을 특징으로 하는 코팅지. - 제 1항에 있어서,
상기 제2 코팅층 내 라텍스 함량은 제2 코팅층 내 총 고형분을 기준으로 7 내지 20 중량% 범위 내인 것을 특징으로 하는 코팅지. - 제 1 항에 있어서,
상기 안료는 클레이, 탄산칼슘 또는 이들의 혼합물을 사용하는 것을 특징으로 하는 코팅지. - 제 1 항에 있어서,
상기 보조안료는 플라스틱 안료, 티타늄 옥사이드 또는 이들의 혼합물을 사용하는 것을 특징으로 하는 코팅지. - 제 1 항에 있어서,
상기 스티렌-부타디엔계 라텍스는 스티렌계 단량체 29 내지 79 중량부, 부타디엔계 단량체 20 내지 70 중량부, 및 에틸렌성 불포화산 단량체 1 내지 10 중량부를 포함하여 이루어지는 것을 특징으로 하는 코팅지. - 제 11 항에 있어서,
상기 스티렌-부타디엔계 라텍스는 에틸렌성 불포화 니트릴 단량체 최대 20 중량부, 에틸렌성 불포화 단량체 최대 8 중량부 또는 이들의 혼합물을 더 포함하여 이루어지는 것을 특징으로 하는 코팅지. - 입자 크기가 70 내지 120 nm이고 유리전이온도가 10 내지 30 ℃인 라텍스가 포함된 제1 도공액과 입자 크기가 120 내지 200 nm이고 유리전이온도가 -30 내지 0 ℃인 라텍스가 포함된 제2 도공액을 제조하는 단계;
상기 제1 도공액을 원지 상에 코팅한 다음 건조시켜 프리 코팅층으로서 제1 코팅층을 형성하는 단계; 및
상기 제2 도공액을 상기 제1 코팅층 상에 코팅한 다음 건조시켜 탑 코팅층으로서 제2 코팅층을 완성하는 단계; 를 포함하여 이루어지며,
이때 제1 코팅층과 제2 코팅층으로된 총 코팅층의 총 두께는 20 내지 60㎛ 범위를 만족하는 것을 특징으로 하는 코팅지의 제조 방법. - 제 13 항에 있어서,
상기 제1 도공액 또는 제2 도공액은 안료 및 보조안료 100 중량부에 대하여 스티렌-부타디엔계 라텍스 5 내지 20 중량부 및 증점제 0.1 내지 9 중량부를 혼합하여 고형분 60 내지 75%, pH 8 내지 11을 만족하는 것을 사용함을 특징으로 하는 코팅지의 제조 방법. - 제 13 항에 있어서,
상기 원지는 평량 70 내지 350 g/m2 범위 내인 아트지용 원지, 아트보드지용 원지, 판지용 원지를 사용하는 것을 특징으로 하는 코팅지의 제조 방법. - 제 13 항에 있어서,
상기 코팅층은 카렌다 공법 상 슈퍼카렌다(super calendar), 또는 소프트닙 카렌다(soft-nip calendar)를 사용하여 수행되는 것을 특징으로 하는 코팅지의 제조 방법.
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