恒黏剂对杯凝胶可塑度及硫化胶性能的影响
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摘要
以盐酸羟胺(HH)和OPRHAZ(OP) 2种恒黏剂对天然橡胶杯凝胶进行恒黏改性,制备恒黏橡胶。用门尼黏度仪、凝胶渗透色谱、华莱士塑性计分析盐酸羟胺和OPRHAZ对天然橡胶门尼黏度、相对分子质量、塑性初值(P0)和塑性保持率(PRI)的影响。实验结果表明,0. 2～0. 6 phr的盐酸羟胺和0. 2～0. 6 phr的OPRHAZ都可以有效地将天然橡胶杯凝胶的门尼黏度控制在60以下,制备出恒黏胶的塑性初值(P0)≥30。
The present paper described the constant viscosity modification of natural rubber cup gel with hydroxylamine hydrochloride( HH) and alkyl hydrazine compounds( OP). Then,the influence of the constant viscosity agent HH and OP on the Mooney viscosity,relative molecular weight,initial plasticity( P0) and plasticity( PRI) of the crude rubber was analyzed by Mooney viscometer,gel permeation chromatography and Wallace plastometer. The experimental results indicate that hydroxylamine hydrochloride( 0. 2 ～ 0. 6) and OPRHAZ( 0. 2 ～ 0. 6) can effectively control the Mooney viscosity of natural rubber cup gel below 60,and the initial plastic value( P0) of natural rubber is more than30.
The present paper described the constant viscosity modification of natural rubber cup gel with hydroxylamine hydrochloride( HH) and alkyl hydrazine compounds( OP). Then,the influence of the constant viscosity agent HH and OP on the Mooney viscosity,relative molecular weight,initial plasticity( P0) and plasticity( PRI) of the crude rubber was analyzed by Mooney viscometer,gel permeation chromatography and Wallace plastometer. The experimental results indicate that hydroxylamine hydrochloride( 0. 2 ～ 0. 6) and OPRHAZ( 0. 2 ～ 0. 6) can effectively control the Mooney viscosity of natural rubber cup gel below 60,and the initial plastic value( P0) of natural rubber is more than30.
引文
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[9]Mei C,Yong-Zhou W,Guang L,et al.Effects of different drying methods on the microstructure and thermal oxidative aging resistance of natural rubber[J].J.Appl.Polym.Sci.,2012,126:1808-1813.
[10]Salomez M,Subileau M,Intapun J,et al.Micro-organisms in latex and natural rubber coagula of Hevea brasiliensis and their impact on rubber composition,structure and properties[J].J.Appl.Microbiol.,2015,117:921-929.
[2]杨清芝.实用橡胶工艺学[M].北京:化学工业出版社,2005.
[3]金林赫,蔡婧宜,张会丰,等.天然橡胶分子链侧链结构的表征[J].材料研究学报,2017,31(5):369-373.Jin L H,Cai J Y,Zhang H F,et al.Structural characterization of natural rubber molecular side chain[J].Chinese Journal of Materials Research,2017,31(5):369-373.
[4]Sekhar B C.Degradation and crosslinking of polyisoprene in Hevea brasiliensis latex during processing and storage[J].J.Polym.Sci.Part A:Polym.Chem.,1960,48:133-137.
[5]Thuong N T,Yamamoto O,Nghia P T,et al.Effect of naturally occurring crosslinking junctions on green strength of natural rubber[J].Polym.Adv.Technol.,2017,28:303-311.
[6]Nimpaiboon A,Sriring M,Sakdapipanich J T.Molecular structure and storage hardening of natural rubber:insight into the reactions between hydroxylamine and phospholipids linked to natural rubber molecule[J].J.Applied Polymer Science,2016,133:DOI:10.1002/app.43753.
[7]段志松,廖建和,廖禄生,等.恒粘剂2-巯基苯并噻唑对天然橡胶性能的影响[J].橡胶工业,2013,60(5):279-283.Duan Z S,Liao J H,Liao L S,et al.Effect of viscosity stabilizer 2-mercaptobenzothiazole on properties of natural rubber[J].China Rubber Industry,2013,60(5):279-283.
[8]王永周,张北龙,黄红海,等.恒粘剂硫酸联胺对天然橡胶硫化特性的影响[J].橡胶工业,2016,63(1):27-30.Wang Y Z,Zhang B L,Huang H H,et al.Effect of constant viscosity agent on molecular structure and dynamic mechanical properties of raw constant viscosity natural rubber[J].China Rubber Industry,2016,63(1):27-30.
[9]Mei C,Yong-Zhou W,Guang L,et al.Effects of different drying methods on the microstructure and thermal oxidative aging resistance of natural rubber[J].J.Appl.Polym.Sci.,2012,126:1808-1813.
[10]Salomez M,Subileau M,Intapun J,et al.Micro-organisms in latex and natural rubber coagula of Hevea brasiliensis and their impact on rubber composition,structure and properties[J].J.Appl.Microbiol.,2015,117:921-929.