直经整芯PVC阻燃输送带的研制

以直经编织结构的整体带芯作为骨架材料,由PVC／PNBR（聚氟乙烯／粉末丁腈橡胶）共混改性的弹性体胶料作为覆盖胶,采用挤擦工艺法制得厚盖胶直经整芯PVC阻燃输送带。与普通整芯输送带相比,前者提高了纱线强度利用率,降低了定负荷伸长,提高了覆盖胶的耐磨性、弹性及摩擦系数,成倍延长了输送带的使用寿命,使之更加适用于长运距、大运量条件下的输送场所。     

浸渍法测定PVC输送带塑化程度

全塑料阻燃整芯输送带（PVC输送带）是由整体带芯浸渍PVC糊再覆盖PVC糊制成。PVC的塑化程度直接影响PVC输送带的性能及使用寿命。测定塑化程度是PVC输送带加工过程质量控制的重点。目前尚无定量测定PVC输送带塑化程度的方法，通常靠测试成品输送带物理性能来判断塑化程度。本文简要介绍利用溶剂浸渍快速测定PVC输送带塑化程度的方法。     

增粘剂CK-90在整芯阻燃输送带覆盖胶中的应用

试验研究增粘剂CK-90在PVG整芯阻燃输送带覆盖胶中的应用。结果表明,适量的增粘剂CK-90对整芯阻燃输送带覆盖胶硫化特性、物理性能和阻燃性能无明显不良影响,可提高覆盖胶与整体带芯的粘合强度以及成品输送带的动态粘合性能。     

模压成型法PVG阻燃整芯输送带覆盖胶的配方优化

对模压成型法PVG阻燃整芯输送带[由聚氯乙烯树脂(PVC)阻燃整芯输送带表面贴合橡胶型覆盖胶制成]覆盖胶进行配方优化。覆盖胶优化配方为:丁腈橡胶100,PVC(糊状) 30,炭黑N234 40,硬脂酸2,氧化锌5,氯化石蜡/三氧化二锑/硼酸锌/聚磷酸铵/氢氧化铝20/8/15/15/15,分散剂R50 5,增塑剂20,防老剂2,硫黄/促进剂TBBS1.7/1.8。优化配方覆盖胶与带芯粘合性能、物理性能、阻燃性能和滚筒摩擦试验结果达到MT 914—2008要求。     

提高PVC阻燃输送带覆盖层厚度及均匀性的探讨

<正>自整芯阻燃输送带MT914-2008标准发布以来,生产PVC输送带覆盖层厚度要求由原来的≥0.8mm提高为≥1.0mm,其主要原因是PVC输送带中带芯的寿命要远远高于覆盖层耐磨使用寿命,通过提高覆盖层厚度来提高PVC输送带的整体使用     

煤矿用整芯阻燃输送带动态粘合性能的测定

采用屈挠试验测定煤矿用整芯阻燃输送带覆盖胶与整体带芯的动态粘合性能.进行屈挠试验,当屈挠2万次时,输送带覆盖胶与芯体不出现剥离裂口,则其动态粘合性能可达到或超过设计使用要求,与粘合强度相比,动态粘合性能用于判断输送带的实际使用寿命更为准确.     

挤出法整芯阻燃输送带成槽性能的改进

通过对挤出法生产整芯阻燃输送带盖胶和芯糊配方的调整,以及对工艺的改进,提高带体的刚性,成槽度0.26以下,提高此品种带体的使用寿命和接头强度,延长整芯阻燃带的使用寿命。     

煤矿井下用PVG整芯阻燃输送带覆盖胶工艺研究

通过采用新工艺可提高PVG整芯阻燃输送带覆盖胶胶料加工性能和覆盖胶各项性能,降低能耗,同时还可提高设备安全操作性,提高PVC用量和提高经济效益。     

高强度阻燃叠层帆布输送带用聚酯帆布的阻燃浸胶技术

鉴于普通叠层帆布输送带阻燃效果差、PVC浸渍整芯输送带使用寿命短，认为开发阻燃叠层帆布输送带很有必要。采用浸胶法制备了阻燃PP和EP帆布用以生产阻燃叠层帆布输送带。阻燃浸渍胶液主要由卤代烃类混合溶剂、CR、叔丁基酚醛树脂及溴类、有机磷类、三氧化二锑和硼酸锌等阻燃剂组成。详细描述了浸渍胶液的制备和阻燃浸胶帆布的生产，并分析了阻燃浸胶帆布的生产成本和市场前景。     

安徽中意:带过渡层的整芯阻燃输送带填补国内空白

<正>2014年度安徽省科学技术奖名单近期公布,安徽中意胶带有限责任公司自主研发的发明专利产品——带过渡层的整芯阻燃输送带获得三等奖。安徽省科技厅组织的鉴定专家组认为,产品填补了国内空白,技术水平达到国际先进。据了解,整芯阻燃输送带是目前煤矿井下运输煤炭的主要工具,根据MT914-2008《煤矿用织物整芯阻燃输送带》规定,整芯阻燃输送带分为两种类型,一种是塑料整芯阻燃输送带,简称PVC型;另一种     

NBR/PVC乳液共沉合金的制备与性能

丁腈橡胶（NBR）与聚氯乙烯（PVC）共混合金是橡塑共混体系中一类重要的共混体系,NBR和PVC都属于极性聚合物,在共混过程中,相容性较好,因此这种体系被广为研究和应用。但此方法是选用粉末丁腈胶直接加入PVC中进行混炼共混,仍然存在共混不均匀的问题。本实验用乳液共混凝聚法制备了NBR/PVC共沉胶,研究了共沉工艺条件、丁腈胶种类与性能对NBR/PVC合金性能影响。     

增塑PVC/NBR共混胶的辐照改性

以三羟甲基丙烷三丙烯酸酯（TMPTA）单体为交联敏化剂，采用电子束对聚氯乙烯（PVC）与丁腈橡胶（NBR）的共混胶进行了辐照改性。研究结果表明，对增塑PVC/NBR共混胶进行辐照改性，可以大大提高共混胶的力学性能及耐热性能。     

动态硫化PVC/SBR共混体系的研究

采用动态硫化法制备了ＰＶＣ／ＳＢＲ共混物，考察了橡塑比、硫化体系、相容剂及ＰＶＣ交联对共混物性能的影响。结果表明，当ＰＶＣ／ＳＢＲ并用比为７５／２５，相容剂ＮＢＲ／氯化聚乙烯并用比为２．５／２．５，采用半有效或半有效加２份交联剂ＤＣＰ的硫化体系时，共混物综合性能较好。在ＰＶＣ中加入０．４份促进剂ＮＡ－２２可明显改善共混物的压缩永久变形。     

Mechanical Properties and Thermooxidative Aging of a Ternary Blend,Pvc/Enr/Nbr,Compared with the Binary Blends of Pvc

In the quest to improve the thermooxidative aging of the poly(vinyl chloride)/epoxidized natural rubber (PVC/ENR) blend, nitrile rubber (NBR) was incorporated into the blend to yield a ternary blend of PVC/ENR/NBR. A Brabender Plasticorder with a mixing attachment was used to perform the melt mixing at 150°C and 50 rpm followed by compression molding. The mechanical properties, dynamic mechanical properties, and thermooxidative aging behavior of the ternary blend were compared with those of the binary blends (i.e., PVC/ENR and PVC/NBR). It was found that the ternary blend exhibits mechanical properties which are superior to those of PVC/ENR. A single glass transition temperature (T _g) obtained from dynamic mechanical analysis coupled with synergism in the modulus and some other mechanical properties indicate that PVC, ENR, and NBR form a single phase (miscible system) in the ternary blend. Di-2-ethyl hexylphthalate (DOP) plasti-cizer improves the aging resistance of the blends generally, whereas the presence of CaCO₃ as a filler only imparts minor influences on the properties and aging resistance of the blends.     

NBR／PVC／CO耐油胶管的研制

研究了丁腈橡胶／ 聚氯乙烯／ 氯醇橡胶三元共混胶制备胶管的胶料配方和混炼制造工艺,主要探讨ＮＢＲ／ ＰＶＣ／ ＣＯ 共混比、硫化体系、补强剂等因素对胶管用混炼胶性能的影响。实验结果表明：ＮＢＲ／ ＰＶＣ／ ＣＯ 共混胶经过合理的配合能够制得综合性能良好的胶料,并能改善ＮＢＲ／ ＰＶＣ老化硬化现象。     

Mechanical and thermo-oxidative properties of blends of poly(vinyl chloride) with epoxidized natural rubber and acrylonitrile butadiene rubber in the presence of an antioxidant and a base

Being polar and compatible with poly(vinyl chloride), epoxidized natural rubber (ENR) is similar in behaviour to acrylonitrile butadiene rubber (NBR). To assess the extent of this similarity, the mechanical properties of 50/50 blends of PVC with these two rubbers were compared. Their response to thermo-oxidative ageing in the presence of an antioxidant and a base was also investigated by ageing the blends at 100°C for 7 days. Studies involving mechanical properties and FTIR were used to evaluate the extent of thermal degradation. The results revealed that blends of ENR show mechanical properties which are as good as, and in some instances better than, those of the NBR blends. However, the ENR blends with PVC are very prone to oxidative ageing. This might be attributed to the susceptibility of the oxirane group to ring-opening reactions, particularly in the presence of PVC, which yields HCl as it degrades. The amine-type antioxidant 2,24-trimethyl-1,2-dihydroquinoline (TMQ) improved the oxidative stability of both blends. This was more significant in the ENR blend, which in some cases attained stability comparable with that of NBR. The addition of a base, calcium stearate [Ca(St)₂], did not show any influence in the PVC/ENR blend, even though it was expected to curb acid-catalysed degradation. Ca(St)₂, however, improved the oxidative stability of the PVC/NBR blend. The combination of optimum amounts of TMQ and Ca(St)₂ effectively improved the tensile strength of both unaged blends, without appreciable adverse effect on elongation at break. This combination also imparted stability better than that of TMQ alone.     

Irradiation Modification of PVC/NBR Blend

Electron beam initiated cross-linking on the 50/50 poly(vinyl chloride), PVC/acrylonitrile butadiene rubber, NBR blend was studied in the absence and presence of 4 phr trimethylolpropane triacrylate (TMPTA). The 50/50 NBR/PVC blend was prepared by mixing in a Brabender Plasticoder at 170°C. The blend was then irradiated by using a 3.0 MeV electron beam machine at doses ranging from 0 to 200 kGy in air and room temperature. The changes in gel fraction, tensile strength, hardness, impact strength, scanning electron micrographs and dynamic mechanical properties of the samples were investigated. The gel fraction results indicate that under the irradiation conditions employed, the PVC/NBR blend cross-linked by electron beam irradiation. The addition of TMPTA was found to be effective in the acceleration of the radiation-induced cross-linking. Gradual increases in mechanical properties with irradiation dose were observed before exhibiting a decline due to embrittlement as a consequence of excessive cross-linking at higher irradiation doses. The gradual changeover from ductile to brittle fracture due to the irradiation-induced cross-linking was evident from the SEM examination The increase in the storage modulus and T_g as well as the reduction in the damping peak with the increase in irradiation dose reveal that the enhancement in mechanical properties of NBR/PVC blends upon irradiation is due to the irradiation-induced cross-linking, as well as the improved interaction between NBR and PVC.     

Mechanical properties of PVC/SBR blends compatibilized by acrylonitrile-butadiene rubber and covulcanization

The mechanical properties of poly(vinyl chloride) (PVC)/styrene-butadiene rubber (SBR) blends compatibilized by acrylonitrile-butadiene rubber (NBR) were studied. A sulfur curing system was employed to crosslink the rubber of the blends. In the case of the blends without any curing agents, an increase in NBR content did not improve the tensile strength and elongation-at-break. However, a significant improvement in the mechanical properties was observed when NBR was added as a compatibilizer and the blend was vulcanized. In the PVC/NBR/SBR (50/10/40) blends, the tensile strength and elongation-at-break increased with an increase in sulfur concentration. This improvement was attributed to covulcanization between NBR and SBR. The fracture toughness of PVC/NBR/SBR (50/10/40) blends was characterized by the critical strain energy release rate, G_c. In the case of the PVC/NBR-29/SBR (50/10/40) blends, an increase in sulfur concentration resulted in a dramatic increase in G_c. However, the G_c value of PVC/NBR-40/SBR (50/10/40) blends decreased with an increase in sulfur concentration owing to the brittle behavior of one of the blend components—the PVC/NBR-40 (50/10) phase.     

Synthesis and characterization of polymeric plasticizer from PET waste and its applications in nitrile rubber and nitrile–PVC blend

Polyethylene terephthalate (PET) waste is not biodegradable; thus, it will create environmental hazards if disposed in landfills. Therefore, the only way of addressing the problem of disposal of post-industrial and post-consumer PET wastes is through recycling. The polyester plasticizer for polyacrylonitrile butadiene rubber (NBR) and polyacrylonitrile butadiene–polyvinylchloride rubber blend (NBR–PVC) was obtained by the depolymerization of PET waste with 2-ethyl-1-hexanol. The PET waste was depolymerized until a polymeric plasticizer with the average molecular weight in the range of 450–900 g/mol was obtained. The polymeric plasticizer was characterized for acid and hydroxyl numbers, viscosity, density, FTIR, NMR and TGA/DTA thermogram. The prepared polymeric plasticizer was used in the preparation of nitrile rubber and nitrile–PVC rubber blend rubber sheets, where these sheets were tested for compatibility, tensile strength, elongation-at-break, hardness and ageing properties. Nitrile rubber and nitrile–PVC blend sheets were also prepared using DOP as a plasticizer and a comparative study with the synthesized polymeric plasticizer was made. It was observed that synthesized polymeric plasticizer provides excellent tensile properties and ageing resistance for high-performance applications as compared to that obtained from DOP. The end uses for nitrile rubber and nitrile–PVC rubber blend compounds are quite diverse, but they can be loosely categorized as being either general performances or higher performance applications. Each of these performance categories requires a different set of considerations in terms of compounding with plasticizers.     

Study on compatibilization-crosslinking synergism in PVC/LDPE blends

Influences of nitrile rubber (NBR, acrylonitrile content 33.5 – 36.5 wt.-%) on the structure and mechanical properties of poly(vinyl chloride) (PVC)/low density polyethylene (LDPE) blends and its synergism with crosslinking agent have been studied. The addition of NBR to the blend is accompanied by a decrease in domain size and improvements in mechanical properties of the blend. When dicumyl peroxide (DCP) is added to the blend together with NBR, good synergism is caused and mechanical properties will improve dramatically. It is concluded that NBR can promote the phase dispersion of PVC and LDPE and their interfacial adhesion. Then, the probability of DCP existing at the interface will increase and more co-crosslinked products will form. Therefore, compatibilization and crosslinking are both exerted sufficiently.