Sidek, Mufidah Md (2015) Study On Laminated Natural Rubber (Nr) Latex Based Films For Mould Cleaning Application. Masters thesis, Universiti Sains Malaysia.
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Abstract
Penggunaan lateks getah asli (GA) semakin meningkat kebelakangan ini menyebabkan peningkatan sisa lateks di tapak pelupusan. Ini adalah kerana sifat kompaun getah yang tidak stabil dan spesifikasi kualiti produk lateks yang ketat. Sisa buangan yang tidak digunakan dengan betul boleh menimbulkan masalah ekologi dan alam sekitar yang serius. Disebabkan masalah ini, satu percubaan telah dibuat untuk menghasilkan laminasi lateks GA dengan sisa lateks getah asli (SGA) untuk digunakan sebagai sebatian pembersih acuan menggantikan sebatian getah kering. Laminasi filem lateks disediakan dengan menyusun kepingan lateks GA (lapisan luar) dan kepingan lateks SGA (lapisan teras) secara berselang-seli. Lapisan luar mengandungi agen pencuci untuk tujuan pembersihan. Kesan jenis dan pembebanan agen pencuci yang berbeza telah dikaji. Filem lateks GA dengan agen pencuci monoethanolamine (MEA) mempunyai sifat mekanikal yang baik berbanding filem lateks GA dengan agen pencuci di-(3-aminopropyl) ether of diethylene glycol (DCA 221). Pembebanan optimum bagi agen pencuci MEA diperolehi pada 5 phr, peningkatan pembebanan MEA menyebabkan sifat mekanikal filem semakin menurun. Kesan perbezaan ketebalan lateks GA berlamina pada suhu pengacuanan yang berbeza terhadap sifat mekanikal juga dikaji. Filem berlamina dengan lapisan teras yang nipis memerlukan suhu pengacuanan yang rendah manakala filem berlamina dengan lapisan teras yang tebal memerlukan suhu pengacuanan yang tinggi untuk membentuk filem dengan sifat mekanikal yang baik. Lapisan teras memberikan filem lateks berlamina dengan sifat-sifat mekanikal yang lebih baik, tetapi nisbah lapisan teras yang berlebihan akan menyebabkan penurunan sifat-sifat tersebut. Keberkesanan pembersihan acuan, samada sebatian lateks GA atau lateks getah nitril (NBR) bergantung kepada kebolehaliran lapisan getah segar yang mempunyai agen pencuci. Keberkesanan pembersihan acuan filem berlamina lateks NBR lebih bagus berbanding filem berlamina lateks GA. Ini mungkin disebabkan kebolehaliran lateks NBR lebih baik daripada lateks GA dan lateks NBR mempunyai rintangan yang baik terhadap minyak berbanding lateks GA. ________________________________________________________________________________________________________________________ The consumption of natural rubber (NR) latex is increasing recently hence increased the waste latex in landfill. This is due to the unstable nature of the latex compound and the strict specifications in the quality of latex products. Improper use of waste latex can create serious ecological and environmental problems. Due to this problem, an attempt was made to laminate the NR latex with waste natural rubber (WNR) latex as mould cleaning compound to substitute the dry rubber compound. The latex lamination films were prepared by arranging the NR latex sheets (outer layer) alternately with WNR latex sheet (core layer). The outer layers contain the cleaning agent for cleaning purposes. Effect of different types and different loading of cleaning agent were investigated. NR latex film with monoethanolamine (MEA) cleaning agent gives the best mechanical properties compare to NR latex film with di-(3-aminopropyl) ether of diethylene glycol (DCA 221) cleaning agent. The optimum loading for MEA cleaning agent was obtained at 5 phr, the increment of MEA loading caused the mechanical properties of the NR latex film to decrease. The effect of different thicknesses of NR latex laminated film at different moulding temperature on mechanical properties of NR latex also has been studied. The laminated film with thinner core layer needed low moulding temperature while the laminated film with thicker core layer needed higher moulding temperature to form the film with good mechanical properties. The core layer gave laminated latex film with better mechanical properties, but excessive of core layer portion caused the decreased in the properties. The effectiveness of mould cleaning, either NR latex or NBR latex compound was depends on the flow ability of the fresh latex layer with mould cleaning agent. The mould cleaning effectiveness of the NBR latex laminated film is observed to be better than NR latex laminated film. It is maybe due to the flow ability of NBR latex is better than NR latex and NBR latex has good resistance to oil compare to NR latex.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | Full text is available at http://irplus.eng.usm.my:8080/ir_plus/institutionalPublicationPublicView.action?institutionalItemId=3106 |
| Subjects: | T Technology T Technology > TN Mining Engineering. Metallurgy > TN263-271 Mineral deposits. Metallic ore deposits. Prospecting |
| Divisions: | Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Bahan & Sumber Mineral (School of Material & Mineral Resource Engineering) > Thesis |
| Depositing User: | Mr Mohd Jasnizam Mohd Salleh |
| Date Deposited: | 30 Aug 2018 09:03 |
| Last Modified: | 30 Aug 2018 09:03 |
| URI: | http://eprints.usm.my/id/eprint/41613 |
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