N\u1ebfu b\u1ea1n d\u00f9ng ch\u1ea3o b\u1eb1ng gang, nh\u00f4m th\u01b0\u1eddng \u0111\u1ec3 chi\u00ean, r\u00e1n c\u00e1, tr\u1ee9ng, n\u1ebfu kh\u00f4ng kh\u00e9o s\u1ebd b\u1ecb d\u00ednh ch\u1ea3o. Nh\u01b0ng n\u1ebfu d\u00f9ng ch\u1ea3o kh\u00f4ng d\u00ednh \u0111\u1ec3 r\u00e1n c\u00e1, tr\u1ee9ng th\u00ec th\u1ee9c \u0103n s\u1ebd kh\u00f4ng d\u00ednh ch\u1ea3o. \u1ede \u0111\u00e2y c\u00f3 g\u00ec th\u1ea7n b\u00ed kh\u00f4ng?<\/p>\n\n\n\n
Th\u1ef1c ra \u1edf m\u1eb7t trong c\u1ee7a ch\u1ea3o kh\u00f4ng d\u00ednh ng\u01b0\u1eddi ta c\u00f3 tr\u1ea3i m\u1ed9t l\u1edbp h\u1ee3p ch\u1ea5t cao ph\u00e2n t\u1eed. Ch\u00fang ta \u0111\u1ec1u bi\u1ebft \u0111\u1ea1i \u0111a s\u1ed1 h\u1ee3p ch\u1ea5t cao ph\u00e2n t\u1eed l\u00e0 nh\u1eefng h\u1ee3p ch\u1ea5t b\u1ec1n, ch\u1ecbu \u0111\u01b0\u1ee3c axit, ch\u1ecbu \u0111\u01b0\u1ee3c ki\u1ec1m, ch\u1ecbu \u0111\u01b0\u1ee3c \u0103n m\u00f2n\u2026 Lo\u1ea1i v\u1eadt li\u1ec7u tr\u1ea3i tr\u00ean ch\u1ea3o kh\u00f4ng d\u00ednh l\u00e0 lo\u1ea1i \u0111\u01b0\u1ee3c t\u00f4n vinh l\u00e0 vua ch\u1ea5t d\u1ebbo – \u0111\u00f3 l\u00e0 polytetrafloetylen, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 “teflon”. Polutetra floetylen l\u00e0 m\u1ed9t cao ph\u00e2n t\u1eed kh\u00f4ng ch\u1ee9a hy\u0111ro.<\/p>\n\n\n\n
Trong ph\u00e2n t\u1eed teflon ch\u1ec9 c\u00f3 hai lo\u1ea1i nguy\u00ean t\u1ed1 l\u00e0 cacbon v\u00e0 flo. C\u00e1c nguy\u00ean t\u1eed cacbon v\u00e0 flo trong ph\u00e2n t\u1eed teflon li\u00ean k\u1ebft v\u1edbi nhau r\u1ea5t b\u1ec1n ch\u1eafc, n\u00ean \u0111\u1ed1i v\u1edbi c\u00e1c ch\u1ea5t b\u00ean ngo\u00e0i ch\u00fang nh\u01b0 “l\u00ec ra”. Khi cho teflon v\u00e0o c\u00e1c axit v\u00f4 c\u01a1 ho\u1eb7c h\u1ed7n h\u1ee3p axit v\u00f4 c\u01a1 \u0111\u1eadm \u0111\u1eb7c nh\u01b0 axit sunfuric, axit clohy\u0111ric, mu\u1ed1i \u0103n, c\u01b0\u1eddng thu\u1ef7 (l\u00e0 h\u1ed7n h\u1ee3p axit clohy\u0111ric v\u00e0 axit nitric c\u00f3 t\u00ednh \u0103n m\u00f2n r\u1ea5t m\u1ea1nh) v\u00e0o dung d\u1ecbch ki\u1ec1m r\u1ed3i \u0111un s\u00f4i, teflon kh\u00f4ng h\u1ec1 bi\u1ebfn ch\u1ea5t. T\u00ednh ch\u1ecbu \u0103n m\u00f2n c\u1ee7a teflon c\u00f2n v\u01b0\u1ee3t xa v\u00e0ng. Polytetrafloetylen l\u00e0 h\u1ee3p ch\u1ea5t ho\u00e1 h\u1ecdc c\u00f3 t\u00ednh tr\u01a1 \u0111\u1eb7c bi\u1ec7t, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c s\u1ea3n xu\u1ea5t, khoa h\u1ecdc k\u1ef9 thu\u1eadt.<\/p>\n\n\n\n
Vi\u1ec7c d\u00f9ng n\u00f3 \u0111\u1ec3 tr\u00e1ng l\u00ean ch\u1ea3o kh\u00f4ng d\u00ednh qu\u1ea3 l\u00e0 “d\u00f9ng dao m\u1ed5 tr\u00e2u \u0111\u1ec3 gi\u1ebft g\u00e0”. D\u00f9ng teflon tr\u00e1ng l\u00ean \u0111\u00e1y ch\u1ea3o khi \u0111un v\u1edbi n\u01b0\u1edbc s\u00f4i kh\u00f4ng h\u1ec1 x\u1ea3y ra b\u1ea5t k\u1ef3 t\u00e1c d\u1ee5ng n\u00e0o. C\u00e1c lo\u1ea1i d\u1ea7u \u0103n, mu\u1ed1i, t\u01b0\u01a1ng, d\u1ea5m c\u0169ng kh\u00f4ng x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng g\u00ec. Cho d\u00f9 kh\u00f4ng cho d\u1ea7u m\u1ee1 m\u00e0 tr\u1ef1c ti\u1ebfp r\u00e1n c\u00e1, tr\u1ee9ng trong ch\u1ea3o th\u00ec c\u0169ng kh\u00f4ng x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng d\u00ednh ch\u1ea3o m\u1ed9t t\u00ed n\u00e0o.<\/p>\n\n\n\n
Ch\u1ea3o kh\u00f4ng d\u00ednh qu\u1ea3 l\u00e0 ti\u1ec7n l\u1ee3i, th\u00fa v\u1ecb. Nh\u01b0ng c\u00f3 \u0111i\u1ec1u ch\u00fa \u00fd l\u00e0 kh\u00f4ng n\u00ean \u0111\u1ed1t n\u00f3ng ch\u1ea3o kh\u00f4ng tr\u00ean b\u1ebfp l\u1eeda v\u00ec Polytetrafloetylen \u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean 250\u00b0C l\u00e0 b\u1eaft \u0111\u1ea7u ph\u00e2n hu\u1ef7 v\u00e0 \u0111\u1ec3 tho\u00e1t ra c\u00e1c ch\u1ea5t \u0111\u1ed9c. Khi r\u1eeda ch\u1ea3o kh\u00f4ng n\u00ean ch\u00e0 x\u00e1t b\u1eb1ng c\u00e1c \u0111\u1ed3 v\u1eadt c\u1ee9ng v\u00ec nh\u01b0 th\u1ebf s\u1ebd c\u00f3 th\u1ec3 g\u00e2y t\u1ed5n th\u01b0\u01a1ng cho l\u1edbp teflon v\u00e0 g\u00e2y t\u1ed5n h\u1ea1i cho l\u1edbp ch\u1ed1ng d\u00ednh. Nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 v\u1ebft x\u01b0\u1edbc \u0111\u1ec1u l\u00e0m gi\u1ea3m t\u00ednh n\u0103ng c\u1ee7a l\u1edbp ch\u1ed1ng d\u00ednh.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: Ch\u1ea3o kh\u00f4ng d\u00ednh; Teflon; Polytetrafloetylen.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
N\u1ebfu b\u1ea1n d\u00f9ng ch\u1ea3o b\u1eb1ng gang, nh\u00f4m th\u01b0\u1eddng \u0111\u1ec3 chi\u00ean, r\u00e1n c\u00e1, tr\u1ee9ng, n\u1ebfu kh\u00f4ng kh\u00e9o s\u1ebd b\u1ecb d\u00ednh ch\u1ea3o. Nh\u01b0ng n\u1ebfu d\u00f9ng ch\u1ea3o kh\u00f4ng d\u00ednh \u0111\u1ec3 r\u00e1n c\u00e1, tr\u1ee9ng th\u00ec th\u1ee9c \u0103n s\u1ebd kh\u00f4ng d\u00ednh ch\u1ea3o. \u1ede \u0111\u00e2y c\u00f3 g\u00ec th\u1ea7n b\u00ed kh\u00f4ng? Th\u1ef1c ra \u1edf m\u1eb7t trong c\u1ee7a ch\u1ea3o kh\u00f4ng d\u00ednh ng\u01b0\u1eddi ta […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[8,15],"tags":[],"class_list":["post-8008","post","type-post","status-publish","format-standard","hentry","category-hoa-hoc","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8008","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=8008"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8008\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=8008"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=8008"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=8008"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}