Concentrated cup lump and lace rubber là gì
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WO2015199621A1 - Coagulation of cup lump with water soluble cationic polymer - Google PatentsCoagulation of cup lump with water soluble cationic polymer Download PDF InfoPublication number WO2015199621A1WO2015199621A1 PCT/TH2014/000029 TH2014000029W WO2015199621A1 WO 2015199621 A1 WO2015199621 A1 WO 2015199621A1 TH 2014000029 W TH2014000029 W TH 2014000029W WO 2015199621 A1 WO2015199621 A1 WO 2015199621A1 Authority WO WIPO (PCT) Prior art keywords cationic polymer latex soluble cationic water soluble coagulation Prior art date 2014-06-25 Application number PCT/TH2014/000029 Other languagesFrench (fr) Inventor Wirach TAWEEPREDA Original Assignee Univentures Public Company Limited Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) 2014-06-25 Filing date 2014-06-25 Publication date 2015-12-30 2014-06-25Application filed by Univentures Public Company Limited filed Critical Univentures Public Company Limited 2014-06-25Priority to PCT/TH2014/000029 priority Critical patent/WO2015199621A1/en 2015-12-30Publication of WO2015199621A1 publication Critical patent/WO2015199621A1/en Links
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AbstractProcess for producing cup lump with high efficiency from adding soluble cationic polymer into the natural rubber latex, without incorporating metallic ions into the natural rubber latex, by adding an acid, such as formic acid or acetic acid with the wet cake formed at pH lower than 8.0. DescriptionCOAGULATION OF CUP LUMP WITH WATER SOLUBLE CATIONIC POLYMER Technical Field This invention relates to an adding water soluble cationic polymer containing a quaternary ammonium salt in its molecular chain to the latex and further reducing the pH of the latex to lower 8.0 with acid, coagulation takes place in the cup at the tree to obtain a wet cake and then self-removing freed water from the rubber particle making a high quality and clean cup lump composition. Background Art Natural rubber comes from rubber plantations is present in latex which is an emulsion or dispersion of rubber in water. The rubber latex occurs in the bark of the rubber trees in tubes or ducts which spiral from left to right as they ascend the trees. The latex is tapped from the rubber trees about every other day. This is done by making a spiral cut downward from left to right at an angle of about 30 degree for half of the circumference of the tree. The cut is made almost, but not completely, through the bark. In any case, the cut is deep enough to pierce the latex tubes or ducts which allow the latex to flow through the cut to a spout that is inserted at the lowest part of the cut. The spout is situated in a manner that directs the flow of latex into a collection cup. A method of coagulation latex by adding an electrolyte to remove water has been industrially employed as a classical technique for obtaining solid rubber from natural rubber latex. Various methods have been known to destabilize latex, such as a method of adding a strong acid to the latex, a method of adding a polyvalent metal salt to the system, or a method of heating. The rubber crumbs generated by the coagulation are then washed, dried and compacted for shipping. Cup lump, rubber, naturally coagulates and forms a lump in the collection cup, is referred to as "tree lace" because it can also coagulate into strips which can be removed from the cuts in the tree's bark. Moreover, cup lump rubber contains a high level of impurities, such as bark, leaves, insects, silt, sand, dirt and other contaminates, and it is of much lower commercial value. Object of invention An object of the present invention is to provide a process for producing cup lump from adding soluble cationic polymer into the natural rubber latex. Another object of the present invention is to provide a process of producing cup lump without incorporating metallic ions into the natural rubber latex. As a result of extensive investigation, the present inventors have found that cup lump containing no metal ions can be produced from fresh field natural rubber latex with high efficiency by adding a specific and further adding thereto an acid, such as formic acid or acetic acid. The wet cake is formed at pH lower than 8.0 and then drying the wet cake directly or let the wet cake dried by self-removing the freed water. Disclosure of invention The cup lump used in the process of this invention is collected on the plantation in the normal way. Fresh filed natural rubber latex collected from rubber trees typically has a solids content of about 30 percent. Specific examples of the water soluble cationic polymer as the coagulating agent include high molecular weight polyelectrolytes, such, for example, as substituted polyacrylamide and polyquarternary amines. Wherein R is a carbon chain of a fatty acid having from 14-22 carbon atoms R' is H, C 1 -C6 alkyl group, R" is H, or CH3 x is an integer of 1-6, and A is an anion establishes a good dispersion system having superior flowability and water separability without forming a bean curd-like or semi-solid mass. The water soluble cationic polymer may be used in a form of a solution in water or any other medium, as the case requires. It is preferred to use it as an aqueous solution containing from 0.05 to 5% by weight of the water soluble cationic polymer. It is preferred that the water soluble cationic polymer is added after reducing the pH of latex to lower than 8.0 with acid and the amount of addition water soluble cationic polymer is usually within the range of from 0.001 to 5% by weight, preferably from 0.01 to 1% by weight, based on the weight of the latex particles in the latex. The coagulation state of the latex particles may be controlled by the adjustment of the amount of addition. If the amount of addition is gradually increased, the viscosity of the latex gradually increases to a certain point and then starts to decrease with a further addition of the cationic polymer. When the wet cake composed of the coagulates of the latex particles separated from the water is granulated, it is necessary to properly adjust the water content of the cake prior to the amount of adding water soluble cationic polymer. ClaimsA process 'for producing cup lump using water soluble cationic polymer. A process as specified in claim 1 wherein the pH of latex reduction to lower than 8.0 using acid before adding water solution cationic polymer. A process as specified in claim 1 wherein at least 50 weight percent of freed water is removed from the latex rubber coagulum. PCT/TH2014/000029 2014-06-25 2014-06-25 Coagulation of cup lump with water soluble cationic polymer WO2015199621A1 (en) Priority Applications (1)Application Number Priority Date Filing Date TitlePCT/TH2014/000029 WO2015199621A1 (en) 2014-06-25 2014-06-25 Coagulation of cup lump with water soluble cationic polymer Applications Claiming Priority (1)Application Number Priority Date Filing Date TitlePCT/TH2014/000029 WO2015199621A1 (en) 2014-06-25 2014-06-25 Coagulation of cup lump with water soluble cationic polymer Publications (1)Publication Number Publication DateWO2015199621A1 true WO2015199621A1 (en) 2015-12-30 FamilyID=54938556Family Applications (1)Application Number Title Priority Date Filing DatePCT/TH2014/000029 WO2015199621A1 (en) 2014-06-25 2014-06-25 Coagulation of cup lump with water soluble cationic polymer Country Status (1)Country LinkWO (1)WO2015199621A1 (en) Citations (3)* Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee TitleUS4001486A (en)* 1975-06-11 1977-01-04Nalco Chemical Company Latex coagulant for emulsion breakers JPS599802A (en)* 1982-07-07 1984-01-19松下電器産業株式会社 Method of producing conductive composition EP0143126A1 (en)* 1983-11-21 1985-06-05Sumitomo Chemical Company, Limited Process for coagulating synthetic rubber latex
Patent Citations (3)* Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee TitleUS4001486A (en)* 1975-06-11 1977-01-04Nalco Chemical Company Latex coagulant for emulsion breakers JPS599802A (en)* 1982-07-07 1984-01-19松下電器産業株式会社 Method of producing conductive composition EP0143126A1 (en)* 1983-11-21 1985-06-05Sumitomo Chemical Company, Limited Process for coagulating synthetic rubber latex Non-Patent Citations (1)* Cited by examiner, † Cited by third party TitleDANWANICHAKUL, P. ET AL.: "Coagulation of Skim Natural Rubber Latex using Chitosan or Polyaclylamide as an Alternative to Sulfuric Acid", EUROPEAN JOURNAL OF SCIENTIFIC RESEARCH, vol. 62, no. 4, 2011, pages 537 |
