\u1ee6ng \u0111i m\u01b0a, gi\u1ea7y cao su, d\u00f9ng l\u00e2u th\u01b0\u1eddng b\u1ecb c\u1ee9ng gi\u00f2n. Ng\u01b0\u1eddi ta g\u1ecdi \u0111\u00e2y l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng “l\u00e3o ho\u00e1”. Hi\u1ec7n t\u01b0\u1ee3ng cao su b\u1ecb l\u00e3o ho\u00e1 l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1 ph\u1ee9c t\u1ea1p, n\u00f3i chung l\u00e0 do t\u00e1c d\u1ee5ng c\u1ee7a oxy v\u00e0 \u00e1nh s\u00e1ng M\u1eb7t Tr\u1eddi g\u00e2y n\u00ean.<\/p>\n\n\n\n
Qu\u00ea h\u01b0\u01a1ng c\u1ee7a cao su l\u00e0 Nam M\u1ef9, ng\u01b0\u1eddi In\u0111ien (th\u1ed5 d\u00e2n da \u0111\u1ecf) g\u1ecdi l\u00e0 “n\u01b0\u1edbc m\u1eaft c\u1ee7a c\u00e2y”. Khi r\u1ea1ch v\u1ecf c\u00e2y cao su, t\u1eeb v\u1ebft r\u1ea1ch s\u1ebd ch\u1ea3y ra nh\u1ef1a cao su m\u00e0u tr\u1eafng s\u1eefa gi\u1ed1ng nh\u01b0 gi\u1ecdt n\u01b0\u1edbc m\u1eaft n\u00ean c\u00f3 t\u00ean g\u1ecdi nh\u01b0 n\u00f3i \u1edf tr\u00ean. Nh\u1ef1a cao su th\u01b0\u1eddng g\u1ecdi l\u00e0 m\u1ee7 cao su. N\u1ebfu th\u00eam v\u00e0o m\u1ee7 cao su m\u1ed9t \u00edt axit axetic th\u00ec m\u1ee7 cao su s\u1ebd \u0111\u00f4ng l\u1ea1i th\u00e0nh kh\u1ed1i r\u1eafn, ng\u01b0\u1eddi ta g\u1ecdi \u0111\u00f3 l\u00e0 cao su s\u1ed1ng. Ph\u00e2n t\u1eed cao su s\u1ed1ng gi\u1ed1ng nh\u01b0 m\u1ed9t s\u1ee3i x\u00edch nh\u1ecf, c\u01b0\u1eddng \u0111\u1ed9 th\u1ea5p nh\u01b0ng c\u00f3 t\u00ednh \u0111\u00e0n h\u1ed3i, d\u1ec5 b\u1ecb k\u00e9o \u0111\u1ee9t, r\u1ea5t nh\u1ea1y c\u1ea3m v\u1edbi s\u1ef1 thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9, khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng, cao su s\u1ed1ng s\u1ebd m\u1ec1m nh\u0169n v\u00e0 tr\u1edf th\u00e0nh keo d\u00ednh. Khi g\u1eb7p nhi\u1ec7t \u0111\u1ed9 th\u1ea5p s\u1ebd c\u1ee9ng l\u1ea1i v\u00e0 tr\u1edf n\u00ean gi\u00f2n v\u00e0 ch\u1ea3 c\u00f2n d\u00f9ng \u0111\u01b0\u1ee3c v\u00e0o vi\u1ec7c g\u00ec. Khi gia c\u00f4ng cao su, ng\u01b0\u1eddi ta d\u00f9ng l\u01b0u hu\u1ef3nh \u0111\u1ec3 thay \u0111\u1ed5i t\u00ednh ch\u1ea5t c\u1ee7a cao su. Nguy\u00ean t\u1eed l\u01b0u hu\u1ef3nh s\u1ebd k\u1ebft n\u1ed1i c\u00e1c ph\u00e2n t\u1eed cao su v\u1edbi nhau, l\u00e0m cho ph\u00e2n t\u1eed cao su c\u00f3 c\u1ea5u t\u1ea1o nh\u01b0 m\u1ea1ng l\u01b0\u1edbi kh\u00f4ng gian, nh\u1edd \u0111\u00f3 t\u0103ng cao c\u01b0\u1eddng \u0111\u1ed9 cao su l\u00ean nhi\u1ec1u l\u1ea7n. Khi gia c\u00f4ng cao su, ngo\u00e0i vi\u1ec7c th\u00eam l\u01b0u hu\u1ef3nh, ng\u01b0\u1eddi ta c\u00f2n cho th\u00eam v\u00e0o cao su nhi\u1ec1u ph\u1ed1i li\u1ec7u nh\u01b0 ch\u1ea5t nhu\u1ed9m m\u00e0u, ch\u1ea5t l\u00e0m m\u1ec1m, ch\u1ea5t t\u0103ng c\u01b0\u1eddng, ch\u1ea5t b\u1ed5 sung (ph\u1ee5 gia \u0111\u1ec7m), ch\u1ea5t ch\u1ed1ng l\u00e3o ho\u00e1. Trong \u0111\u00f3 t\u00e1c d\u1ee5ng c\u1ee7a ch\u1ea5t ch\u1ed1ng l\u00e3o ho\u00e1 \u0111\u1ec3 ng\u0103n cao su kh\u00f4ng b\u1ecb l\u00e3o ho\u00e1, k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a n\u00f3.<\/p>\n\n\n\n
\u00c1nh s\u00e1ng M\u1eb7t Tr\u1eddi c\u00f3 nhi\u1ec1u tia t\u1eed ngo\u1ea1i. Ngo\u00e0i t\u00e1c d\u1ee5ng di\u1ec7t vi tr\u00f9ng, di\u1ec7t khu\u1ea9n, tia t\u1eed ngo\u1ea1i c\u00f2n l\u00e0 “k\u1ebb qu\u1ea5y \u0111\u1ea3o”. Khi tia t\u1eed ngo\u1ea1i \u0111\u00e3 len l\u1ecfi \u0111\u01b0\u1ee3c v\u00e0o b\u00ean trong ch\u1ebf ph\u1ea9m cao su, n\u00f3 s\u1ebd c\u1eaft v\u1ee5n c\u00e1c m\u1eaft x\u00edch c\u1ee7a ph\u00e2n t\u1eed cao su. \u0110\u1ed3ng th\u1eddi nhi\u1ec7t \u0111\u1ed9 cao c\u1ee7a \u00e1nh n\u1eafng M\u1eb7t Tr\u1eddi l\u00e0m nguy\u00ean t\u1eed l\u01b0u hu\u1ef3nh t\u00e1ch r\u1eddi kh\u1ecfi ph\u00e2n t\u1eed cao su, ph\u00e1 ho\u1ea1i c\u1ea5u tr\u00fac kh\u00f4ng gian c\u1ee7a ph\u00e2n t\u1eed. Do \u0111\u00f3 cao su s\u1ebd m\u1ea5t t\u00ednh \u0111\u00e0n h\u1ed3i v\u00e0 l\u1ef1c k\u1ebft h\u1ee3p gi\u1eefa c\u00e1c ph\u00e2n t\u1eed gi\u1ea3m, v\u00ec v\u1eady c\u00e1c \u0111\u1ed3 d\u00f9ng b\u1eb1ng cao su s\u1ebd h\u01b0 h\u1ecfng.<\/p>\n\n\n\n
V\u00ec v\u1eady, sau khi b\u1ea1n r\u1eeda \u1ee7ng \u0111i m\u01b0a v\u00e0 gi\u00e0y cao su, b\u1ea1n n\u00ean \u0111\u1ec3 ch\u00fang v\u00e0o n\u01a1i r\u00e2m m\u00e1t, tho\u00e1ng gi\u00f3 m\u00e0 kh\u00f4ng \u0111em ph\u01a1i tr\u1ef1c ti\u1ebfp d\u01b0\u1edbi \u00e1nh n\u1eafng M\u1eb7t Tr\u1eddi ho\u1eb7c hong \u1edf g\u1ea7n c\u00e1c l\u00f2 l\u1eeda. Kh\u00f4ng n\u00ean \u0111\u1ec3 \u1ee7ng cao su, gi\u00e0y cao su c\u00f9ng m\u1ed9t n\u01a1i c\u00f3 d\u1ea7u, m\u1ee1, v\u00ec c\u00e1c ph\u00e2n t\u1eed d\u1ea7u c\u00f3 th\u1ec3 xen v\u00e0o gi\u1eefa c\u00e1c ph\u00e2n t\u1eed cao su, t\u00e1ch c\u00e1c ph\u00e2n t\u1eed cao su r\u1eddi kh\u1ecfi nhau, khi\u1ebfn \u1ee7ng v\u00e0 gi\u00e0y cao su b\u1ecb tr\u01b0\u01a1ng v\u00e0 bi\u1ebfn d\u1ea1ng.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: Cao su; L\u00e3o ho\u00e1.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
\u1ee6ng \u0111i m\u01b0a, gi\u1ea7y cao su, d\u00f9ng l\u00e2u th\u01b0\u1eddng b\u1ecb c\u1ee9ng gi\u00f2n. Ng\u01b0\u1eddi ta g\u1ecdi \u0111\u00e2y l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng “l\u00e3o ho\u00e1”. Hi\u1ec7n t\u01b0\u1ee3ng cao su b\u1ecb l\u00e3o ho\u00e1 l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1 ph\u1ee9c t\u1ea1p, n\u00f3i chung l\u00e0 do t\u00e1c d\u1ee5ng c\u1ee7a oxy v\u00e0 \u00e1nh s\u00e1ng M\u1eb7t Tr\u1eddi g\u00e2y n\u00ean. Qu\u00ea h\u01b0\u01a1ng c\u1ee7a cao su l\u00e0 […]<\/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-8020","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\/8020","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=8020"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8020\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=8020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=8020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=8020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}