{"id":3303,"date":"2025-05-14T10:50:20","date_gmt":"2025-05-14T02:50:20","guid":{"rendered":"https:\/\/quartz-grinding.epic-powder.com\/?p=3303"},"modified":"2025-05-15T11:58:42","modified_gmt":"2025-05-15T03:58:42","slug":"quartz-powder-surface-modification-technology","status":"publish","type":"post","link":"https:\/\/quartz-grinding.epic-powder.com\/vi\/quartz-powder-surface-modification-technology\/","title":{"rendered":"C\u00f4ng ngh\u1ec7 bi\u1ebfn t\u00ednh b\u1ec1 m\u1eb7t b\u1ed9t th\u1ea1ch anh"},"content":{"rendered":"

\u0110\u1eb7c t\u00ednh b\u1ec1 m\u1eb7t \u01b0a n\u01b0\u1edbc c\u1ee7a b\u1ed9t th\u1ea1ch anh t\u1ea1o ra nh\u1eefng th\u00e1ch th\u1ee9c v\u1ec1 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch v\u1edbi c\u00e1c ma tr\u1eadn polyme h\u1eefu c\u01a1. Do \u0111\u00f3, vi\u1ec7c bi\u1ebfn \u0111\u1ed5i b\u1ec1 m\u1eb7t l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a b\u1ed9t t\u1eeb \u01b0a n\u01b0\u1edbc sang k\u1ef5 n\u01b0\u1edbc, do \u0111\u00f3 t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng th\u1ea5m \u01b0\u1edbt c\u1ee7a h\u1ea1t v\u00e0 th\u00fac \u0111\u1ea9y s\u1ef1 ph\u00e2n t\u00e1n \u0111\u1ed3ng \u0111\u1ec1u trong c\u00e1c h\u1ec7 th\u1ed1ng h\u1eefu c\u01a1.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Nguy\u00ean l\u00fd s\u1eeda \u0111\u1ed5i b\u1ec1 m\u1eb7t th\u1ea1ch anh<\/h2>\n\n\n\n

Nh\u00ecn chung, c\u00e1c h\u1ea1t b\u1ed9t th\u1ea1ch anh c\u00e0ng m\u1ecbn th\u00ec di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ri\u00eang c\u00e0ng l\u1edbn v\u00e0 c\u00e0ng nhi\u1ec1u nh\u00f3m hydroxyl ho\u1ea1t \u0111\u1ed9ng b\u1ec1 m\u1eb7t, khi\u1ebfn n\u00f3 ph\u1ea3n \u1ee9ng m\u1ea1nh h\u01a1n. Sau khi bi\u1ebfn \u0111\u1ed5i, hi\u1ec7u \u1ee9ng \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n. C\u00e1c kho\u00e1ng ch\u1ea5t silicat nh\u01b0 th\u1ea1ch anh, khi b\u1ecb nghi\u1ec1n n\u00e1t v\u1ec1 m\u1eb7t c\u01a1 h\u1ecdc, s\u1ebd t\u1ea1o ra c\u00e1c g\u1ed1c t\u1ef1 do ho\u1eb7c ion tr\u00ean b\u1ec1 m\u1eb7t m\u1edbi h\u00ecnh th\u00e0nh. Trong \u0111i\u1ec1u ki\u1ec7n b\u00ean ngo\u00e0i, c\u00e1c nh\u00f3m nh\u01b0 Si-OH, Si-O-Si v\u00e0 Si-OH\u00b7\u00b7\u00b7H \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh tr\u00ean b\u1ec1 m\u1eb7t. C\u00e1c nh\u00f3m n\u00e0y c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng li\u00ean k\u1ebft v\u1edbi c\u00e1c nh\u00f3m ch\u1ee9c n\u0103ng b\u00ean ngo\u00e0i, \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee5c ti\u00eau bi\u1ebfn \u0111\u1ed5i v\u00e0 t\u1ea1o n\u1ec1n t\u1ea3ng cho bi\u1ebfn \u0111\u1ed5i b\u1ec1 m\u1eb7t. Trong qu\u00e1 tr\u00ecnh bi\u1ebfn \u0111\u1ed5i, c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 nhi\u1ec7t \u0111\u1ed9, l\u1ef1a ch\u1ecdn v\u00e0 l\u01b0\u1ee3ng ch\u1ea5t bi\u1ebfn \u0111\u1ed5i, ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd v\u00e0 quy tr\u00ecnh bi\u1ebfn \u0111\u1ed5i l\u00e0 nh\u1eefng y\u1ebfu t\u1ed1 ch\u00ednh \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u \u1ee9ng bi\u1ebfn \u0111\u1ed5i.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Ph\u01b0\u01a1ng ph\u00e1p s\u1eeda \u0111\u1ed5i<\/h2>\n\n\n\n

C\u00f3 nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec3 bi\u1ebfn t\u00ednh h\u1eefu c\u01a1 b\u1ec1 m\u1eb7t b\u1ed9t th\u1ea1ch anh, nh\u01b0ng ch\u1ec9 d\u1ef1a v\u00e0o h\u1ea5p ph\u1ee5 v\u1eadt l\u00fd l\u00ean b\u1ec1 m\u1eb7t b\u1ed9t th\u1ea1ch anh d\u1eabn \u0111\u1ebfn hi\u1ec7u qu\u1ea3 bi\u1ebfn t\u00ednh k\u00e9m. N\u00f3 d\u1ec5 b\u1ecb t\u00e1ch ra trong qu\u00e1 tr\u00ecnh khu\u1ea5y v\u00e0 r\u1eeda, v\u00e0 kh\u00f4ng th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 hi\u1ec7u su\u1ea5t s\u1ea3n ph\u1ea9m khi \u1ee9ng d\u1ee5ng.
Bi\u1ebfn \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng cao c\u00f3 chi ph\u00ed cao, ph\u1ee9c t\u1ea1p v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt v\u00e0 kh\u00f3 th\u1ef1c hi\u1ec7n trong s\u1ea3n xu\u1ea5t c\u00f4ng nghi\u1ec7p.<\/p>\n\n\n\n

Bi\u1ebfn \u0111\u1ed5i h\u00f3a h\u1ecdc c\u01a1 h\u1ecdc bao g\u1ed3m vi\u1ec7c nghi\u1ec1n b\u1ed9t b\u1eb1ng m\u00e1y \u0111\u1ec3 t\u1ea1o ra c\u00e1c v\u1ecb tr\u00ed ho\u1ea1t \u0111\u1ed9ng t\u1ea1m th\u1eddi tr\u00ean b\u1ec1 m\u1eb7t, l\u00e0m gi\u1ea3m n\u0103ng l\u01b0\u1ee3ng ho\u1ea1t h\u00f3a \u0111\u1ec3 bi\u1ebfn \u0111\u1ed5i b\u1ec1 m\u1eb7t.<\/p>\n\n\n\n

Bi\u1ebfn t\u00ednh l\u1edbp ph\u1ee7 h\u00f3a h\u1ecdc l\u00e0 ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u1ec3 bi\u1ebfn t\u00ednh b\u1ec1 m\u1eb7t b\u1ed9t th\u1ea1ch anh. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y bao g\u1ed3m bi\u1ebfn t\u00ednh t\u00e1c nh\u00e2n gh\u00e9p v\u00e0 gh\u00e9p polyme. C\u01a1 ch\u1ebf li\u00ean k\u1ebft bao g\u1ed3m vi\u1ec7c h\u00ecnh th\u00e0nh li\u00ean k\u1ebft c\u1ed9ng h\u00f3a tr\u1ecb v\u1edbi b\u1ec1 m\u1eb7t b\u1ed9t th\u1ea1ch anh. Trong qu\u00e1 tr\u00ecnh bi\u1ebfn t\u00ednh t\u00e1c nh\u00e2n gh\u00e9p, qu\u00e1 tr\u00ecnh th\u1ee7y ph\u00e2n t\u00e1c nh\u00e2n gh\u00e9p t\u1ea1o ra c\u00e1c nh\u00f3m silanol.<\/p>\n\n\n\n

C\u00e1c nh\u00f3m n\u00e0y tr\u1ea3i qua qu\u00e1 tr\u00ecnh ng\u01b0ng t\u1ee5 m\u1ea5t n\u01b0\u1edbc v\u1edbi c\u00e1c nh\u00f3m hydroxyl silica tr\u00ean b\u1ec1 m\u1eb7t b\u1ed9t th\u1ea1ch anh \u0111\u1ec3 t\u1ea1o th\u00e0nh li\u00ean k\u1ebft c\u1ed9ng h\u00f3a tr\u1ecb. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y ti\u1ebft ki\u1ec7m chi ph\u00ed, mang l\u1ea1i hi\u1ec7u qu\u1ea3 bi\u1ebfn \u0111\u1ed5i cao v\u00e0 s\u1ea3n ph\u1ea9m bi\u1ebfn \u0111\u1ed5i duy tr\u00ec hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh trong th\u1eddi gian d\u00e0i h\u01a1n.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Qu\u00e1 tr\u00ecnh s\u1eeda \u0111\u1ed5i<\/h2>\n\n\n\n

Trong s\u1ea3n xu\u1ea5t c\u00f4ng nghi\u1ec7p, bi\u1ebfn t\u00ednh kh\u00f4 c\u01a1 h\u1ecdc ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. Ch\u1ea5t bi\u1ebfn t\u00ednh \u0111\u01b0\u1ee3c phun v\u00e0o trong qu\u00e1 tr\u00ecnh nghi\u1ec1n, gi\u00fap r\u00fat ng\u1eafn qu\u00e1 tr\u00ecnh c\u00f4ng nghi\u1ec7p. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y t\u1ea1o ra c\u00e1c v\u1ecb tr\u00ed ho\u1ea1t \u0111\u1ed9ng t\u1ea1m th\u1eddi v\u00e0 nhi\u1ec7t \u0111\u1ed9 cao, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho qu\u00e1 tr\u00ecnh bi\u1ebfn t\u00ednh b\u1ec1 m\u1eb7t. S\u1ea3n ph\u1ea9m kh\u00f4ng c\u1ea7n kh\u1eed n\u01b0\u1edbc v\u00e0 s\u1ea5y kh\u00f4. Tuy nhi\u00ean, hi\u1ec7u \u1ee9ng bi\u1ebfn t\u00ednh k\u00e9m h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi ph\u01b0\u01a1ng ph\u00e1p \u01b0\u1edbt. Bi\u1ebfn t\u00ednh kh\u00f3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed3ng \u0111\u1ec1u v\u00e0 nhi\u1ec7t \u0111\u1ed9 cao c\u1ee5c b\u1ed9 c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng ch\u1ea5t bi\u1ebfn t\u00ednh.
Ki\u1ec3m so\u00e1t qu\u00e1 tr\u00ecnh n\u00e0y c\u0169ng l\u00e0 m\u1ed9t th\u00e1ch th\u1ee9c. Sau khi bi\u1ebfn t\u00ednh kh\u00f4, b\u1ed9t th\u1ea1ch anh \u0111\u01b0\u1ee3c coi l\u00e0 s\u1ea3n ph\u1ea9m th\u00f4 trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p nh\u1ef1a, v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng v\u00e0 cao su. Bi\u1ebfn t\u00ednh \u01b0\u1edbt bao g\u1ed3m ng\u00e2m, \u0111un n\u00f3ng, khu\u1ea5y v\u00e0 kh\u1eed n\u01b0\u1edbc b\u1ed9t th\u1ea1ch anh b\u1eb1ng thu\u1ed1c th\u1eed. N\u00f3 ph\u1ee9c t\u1ea1p h\u01a1n c\u00e1c ph\u01b0\u01a1ng ph\u00e1p kh\u00f4 nh\u01b0ng mang l\u1ea1i hi\u1ec7u qu\u1ea3 bi\u1ebfn t\u00ednh t\u1ed1t h\u01a1n. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p cao c\u1ea5p nh\u01b0 m\u00e0ng v\u00e0 l\u1edbp ph\u1ee7.<\/p>\n\n\n\n

Qu\u00e1 tr\u00ecnh bi\u1ebfn t\u00ednh h\u1ed7n h\u1ee3p ph\u1ee7 c\u01a1 h\u1ecdc h\u00f3a h\u1ecdc v\u00e0 h\u00f3a h\u1ecdc li\u00ean quan \u0111\u1ebfn vi\u1ec7c th\u00eam ch\u1ea5t bi\u1ebfn t\u00ednh trong qu\u00e1 tr\u00ecnh nghi\u1ec1n. Qu\u00e1 tr\u00ecnh n\u00e0y k\u1ebft h\u1ee3p nghi\u1ec1n m\u1ecbn v\u00e0 nghi\u1ec1n si\u00eau m\u1ecbn. Khi k\u00edch th\u01b0\u1edbc h\u1ea1t c\u00e1t th\u1ea1ch anh gi\u1ea3m, qu\u00e1 tr\u00ecnh bi\u1ebfn t\u00ednh b\u1ec1 m\u1eb7t di\u1ec5n ra. Qu\u00e1 tr\u00ecnh bi\u1ebfn t\u00ednh h\u1ed7n h\u1ee3p n\u00e0y r\u1ea5t \u0111\u01a1n gi\u1ea3n. M\u1ed9t s\u1ed1 ch\u1ea5t bi\u1ebfn t\u00ednh c\u0169ng h\u1ed7 tr\u1ee3 qu\u00e1 tr\u00ecnh nghi\u1ec1n, c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 nghi\u1ec1n. Tuy nhi\u00ean, vi\u1ec7c ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 r\u1ea5t kh\u00f3 kh\u0103n. C\u00e1c h\u1ea1t li\u00ean t\u1ee5c b\u1ecb nghi\u1ec1n, t\u1ea1o ra b\u1ec1 m\u1eb7t m\u1edbi. L\u1edbp ph\u1ee7 ch\u1ea5t bi\u1ebfn t\u00ednh c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u. Ngo\u00e0i ra, nhi\u1ec7t \u0111\u1ed9 cao do thi\u1ebft b\u1ecb t\u1ea1o ra c\u00f3 th\u1ec3 ph\u00e2n h\u1ee7y ch\u1ea5t bi\u1ebfn t\u00ednh ho\u1eb7c l\u00e0m h\u1ecfng c\u1ea5u tr\u00fac ph\u00e2n t\u1eed c\u1ee7a ch\u00fang.<\/p>\n\n\n\n

Qu\u00e1 tr\u00ecnh s\u1eeda \u0111\u1ed5i h\u1ed7n h\u1ee3p s\u1ea5y v\u00e0 ph\u1ee7 h\u00f3a ch\u1ea5t li\u00ean quan \u0111\u1ebfn vi\u1ec7c th\u00eam ch\u1ea5t s\u1eeda \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh s\u1ea5y b\u1ed9t \u01b0\u1edbt. \u0110\u00e2y l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh t\u1ed5ng h\u1ee3p trong \u0111\u00f3 qu\u00e1 tr\u00ecnh m\u1ea5t n\u01b0\u1edbc v\u00e0 s\u1eeda \u0111\u1ed5i b\u1ec1 m\u1eb7t di\u1ec5n ra \u0111\u1ed3ng th\u1eddi. Qu\u00e1 tr\u00ecnh s\u1ea5y ho\u1ea1t \u0111\u1ed9ng \u1edf nhi\u1ec7t \u0111\u1ed9 cao (tr\u00ean 200\u00b0C).<\/p>\n\n\n\n

Ng\u01b0\u1eddi s\u1eeda \u0111\u1ed5i<\/h2>\n\n\n\n

C\u00e1c ch\u1ea5t \u0111i\u1ec1u ch\u1ec9nh ch\u00ednh cho qu\u00e1 tr\u00ecnh bi\u1ebfn t\u00ednh b\u1ed9t th\u1ea1ch anh bao g\u1ed3m c\u00e1c t\u00e1c nh\u00e2n li\u00ean k\u1ebft silane, c\u00e1c t\u00e1c nh\u00e2n li\u00ean k\u1ebft aluminate v\u00e0 c\u00e1c t\u00e1c nh\u00e2n li\u00ean k\u1ebft titanate. C\u00e1c axit b\u00e9o v\u00e0 m\u1ed9t s\u1ed1 ch\u1ea5t ho\u1ea1t \u0111\u1ed9ng b\u1ec1 m\u1eb7t cation (nh\u01b0 hexadecyltrimethylammonium bromide) th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 bi\u1ebfn t\u00ednh b\u1ec1 m\u1eb7t trong c\u00f4ng nghi\u1ec7p. C\u00e1c ch\u1ea5t \u0111i\u1ec1u ch\u1ec9nh n\u00e0y c\u00f3 gi\u00e1 th\u00e0nh th\u1ea5p v\u00e0 d\u1ec5 \u00e1p d\u1ee5ng, nh\u01b0ng hi\u1ec7u \u1ee9ng bi\u1ebfn t\u00ednh th\u01b0\u1eddng \u1edf m\u1ee9c trung b\u00ecnh, t\u1ea1o ra c\u00e1c s\u1ea3n ph\u1ea9m c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng th\u00f4. C\u00e1c t\u00e1c nh\u00e2n li\u00ean k\u1ebft silane mang l\u1ea1i hi\u1ec7u \u1ee9ng bi\u1ebfn t\u00ednh b\u1ec1 m\u1eb7t t\u1ed1t nh\u1ea5t cho b\u1ed9t th\u1ea1ch anh nh\u01b0ng \u0111\u1eaft h\u01a1n. C\u00e1c t\u00e1c nh\u00e2n li\u00ean k\u1ebft aluminate v\u00e0 titanate c\u00f3 gi\u00e1 th\u00e0nh th\u1ea5p h\u01a1n v\u00e0 d\u1ec5 \u00e1p d\u1ee5ng h\u01a1n, nh\u01b0ng hi\u1ec7u \u1ee9ng bi\u1ebfn t\u00ednh c\u1ee7a ch\u00fang kh\u00f4ng t\u1ed1t b\u1eb1ng c\u00e1c t\u00e1c nh\u00e2n li\u00ean k\u1ebft silane.<\/p>\n\n\n\n

Bi\u1ebfn t\u00ednh b\u1ec1 m\u1eb7t b\u1ed9t th\u1ea1ch anh b\u1eb1ng polysiloxane bi\u1ebfn t\u00ednh c\u00f3 th\u1ec3 thay \u0111\u1ed5i hi\u1ec7u qu\u1ea3 c\u00e1c \u0111\u1eb7c t\u00ednh b\u1ec1 m\u1eb7t c\u1ee7a n\u00f3. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m l\u01b0\u1ee3ng nh\u1ef1a s\u1eed d\u1ee5ng trong qu\u00e1 tr\u00ecnh ch\u1ebf bi\u1ebfn \u0111\u00e1 th\u1ea1ch anh nh\u00e2n t\u1ea1o. Do \u0111\u00f3, chi ph\u00ed s\u1ea3n xu\u1ea5t t\u1ea5m \u0111\u00e1 th\u1ea1ch anh nh\u00e2n t\u1ea1o \u0111\u01b0\u1ee3c gi\u1ea3m \u0111\u00e1ng k\u1ec3.<\/p>\n\n\n\n

S\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p nghi\u1ec1n bi c\u01a1 h\u1ecdc l\u00e0m t\u0103ng c\u01a1 h\u1ed9i ti\u1ebfp x\u00fac v\u00e0 va ch\u1ea1m gi\u1eefa polysiloxane bi\u1ebfn t\u00ednh v\u00e0 b\u1ed9t th\u1ea1ch anh. \u0110i\u1ec1u n\u00e0y th\u00fac \u0111\u1ea9y ph\u1ea3n \u1ee9ng bi\u1ebfn t\u00ednh v\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 tuy\u1ec7t v\u1eddi.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

X\u00e9t \u0111\u1ebfn gi\u00e1 tr\u1ecb h\u1ea5p th\u1ee5 d\u1ea7u, \u0111\u1ed9 nh\u1edbt, th\u1eddi gian th\u1ea9m th\u1ea5u v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 chi ph\u00ed kinh t\u1ebf, li\u1ec1u l\u01b0\u1ee3ng t\u1ed1i \u01b0u c\u1ee7a polysiloxan bi\u1ebfn t\u00ednh l\u00e0 3,5\u2030.<\/p>\n\n\n\n

Ph\u1ea7n k\u1ebft lu\u1eadn<\/h2>\n\n\n\n

Hi\u1ec7n nay, nhu c\u1ea7u v\u1ec1 b\u1ed9t th\u1ea1ch anh bi\u1ebfn t\u00ednh \u0111ang chuy\u1ec3n d\u1ecbch sang k\u00edch th\u01b0\u1edbc h\u1ea1t si\u00eau m\u1ecbn. B\u1ed9t th\u1ea1ch anh nano c\u00f3 c\u1ea5u tr\u00fac m\u1ea1ng ba chi\u1ec1u. \u0110i\u1ec1u n\u00e0y mang l\u1ea1i cho n\u00f3 nh\u1eefng \u0111\u1eb7c t\u00ednh \u0111\u1ed9c \u0111\u00e1o, khi\u1ebfn n\u00f3 tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 thay th\u1ebf trong nhi\u1ec1u \u1ee9ng d\u1ee5ng. N\u00f3 c\u00f3 tri\u1ec3n v\u1ecdng ph\u00e1t tri\u1ec3n \u0111\u1ea7y h\u1ee9a h\u1eb9n. V\u1edbi nh\u1eefng c\u1eadp nh\u1eadt li\u00ean t\u1ee5c v\u1ec1 thi\u1ebft b\u1ecb s\u1ea3n xu\u1ea5t, c\u00e1c c\u00f4ng ngh\u1ec7 bi\u1ebfn t\u00ednh cao c\u1ea5p s\u1ebd tr\u1edf n\u00ean c\u00f4ng nghi\u1ec7p h\u00f3a. \u0110i\u1ec1u n\u00e0y s\u1ebd m\u1edf r\u1ed9ng \u0111\u00e1ng k\u1ec3 ph\u1ea1m vi \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3.<\/p>","protected":false},"excerpt":{"rendered":"

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