共查询到20条相似文献,搜索用时 46 毫秒
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针对乳液型丙烯酸酯PSA(压敏胶)的耐水性较差、耐高温性欠佳及涂布干燥速率较慢等弊病,综述了乳液型丙烯酸酯PSA的最新研究方向及进展(包括高固含量乳液型丙烯酸酯PSA、乳液型交联丙烯酸酯PSA、低表面能材料粘接用乳液型丙烯酸酯PSA和耐水性乳液型丙烯酸酯PSA等);最后对其应用前景进行了展望。 相似文献
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聚乙二醇改性环氧丙烯酸酯光固化树脂的研究 总被引:4,自引:0,他引:4
采用双羟基化合物聚乙二醇对环氧树脂进行改性,制取低黏度的改性环氧树脂,再用丙烯酸酯化,制得低黏度的环氧丙烯酸酯预聚物.研究了聚乙二醇400与环氧树脂的物质的量比、催化剂类型及用量、阻聚剂类型及用量、反应温度、反应时间及酸物质的量与环氧物质的量的比值对反应及产物性能的影响,确定环氧树脂改性反应和丙烯酸酯化反应的最佳条件,同时对树脂固化性能进行了研究. 相似文献
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紫外光固化环氧-丙烯酸酯/聚氨酯-丙烯酸酯复合型水性涂料的研制 总被引:14,自引:0,他引:14
制备了可反应性的阴离子型聚氨酯-丙烯酸酯,并用其作为乳化剂制成了可紫外光固化的水性环氧-丙烯酸酯/聚氨酯-丙烯酸酯复合型水性涂料。讨论了聚氨酯-丙烯酸酯的乳化机理,及其对环氧-丙烯酸酯水分散体系稳定性及涂膜性能的影响。 相似文献
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水性双组分聚氨酯用丙烯酸酯分散体的合成 总被引:1,自引:0,他引:1
采用溶液聚合法合成了水性双组分聚氨酯用丙烯酸酯分散体。系统地研究了溶剂种类、聚合温度、引发剂种类及用量、链转移剂用量对丙烯酸酯多元醇分散体性能的影响,确定了制备低黏度丙烯酸分散体的合成工艺。 相似文献
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低温低渣防腐磷化工艺研究 总被引:2,自引:0,他引:2
研究了低温低渣防腐磷化工艺,通过添加促进剂、络合剂和活化剂,磷化温度降低至50-60℃,沉渣量减少60%。解决了高温防腐磷化溶液成分不、零件表面挂灰严重等问题。磷化膜性能达到了了防腐磷化标准,可取代高温磷化工艺。 相似文献
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Chin-Ping Yang 《Polymer》2006,47(20):7021-7033
Two series of novel polyimides (5a-g and 6a-g) containing flexible ether linkages and pendent trifluoromethyl (CF3) groups were synthesized from 1,4-bis(3,4-dicarboxyphenoxy)benzene dianhydride (3a) and 1,3-bis(3,4-dicarboxyphenoxy)benzene dianhydride (3b) with various CF3-substituted aromatic bis(ether amine)s (4a-g) via ring-opening polyaddition to poly(amic acid)s, followed by thermal or chemical imidization. These polyimides were readily soluble in a variety of organic solvents and could be solution-cast into flexible and tough films. The cast films exhibited high optical transparency and almost no color, with a UV-vis absorption edge of 368-382 nm and a very low b∗ value (a yellowness index) of 6.2-15.5. They had good thermal stability with glass-transition temperatures of 186-288 °C, and most of them did not show significant decomposition before 500 °C. Moreover, these polyimide films also possessed low dielectric constants of 2.79-3.49 (at 1 MHz) and low water uptakes (<0.65 wt%). 相似文献
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《Ceramics International》2022,48(11):15282-15292
The Mo-based glass-free spinel-type structure of the (Na1-xKx)2MoO4 (x = 0.0, 0.1, and 0.2) ceramic series was prepared using the traditional solid-state method at the low sintering temperature (<650 °C). The microwave dielectric properties of the (Na1-xKx)2MoO4 series were determined in terms of phase compositions, crystal structure (via XRD), and microstructure analysis (via FE-SEM and EDS). The results revealed that the double-phase (cubic and orthorhombic) formation plays a significant role in the entire (Na1-xKx)2MoO4 series. It exhibits excellent dielectric properties: dielectric constant εr = 4 (1 GHz)/3.77 (15 GHz), tangent loss tan δ = 8.3 × 10?2 (1 GHz)/7 × 10?3 (15 GHz; Q × f = 2143 GHz), temperature coefficient of frequency (TCF) τf = ?6.45 ppm/°C, and room temperature thermal conductivity (κ) = 1.76 W/(m.K) for x = 0.1 at a sintering temperature of 575 °C. These make the (Na1-xKx)2MoO4 ceramic series a potential candidate for low-temperature co-fired ceramic (LTCC) substrate applications (as used in antennas) for high-speed data communications. 相似文献
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《Ceramics International》2019,45(11):13711-13718
In the field of low temperature co-fired ceramic (LTCC), it remains a challenge to design the performance of LTCC with low permittivity less than 5. Here, a novel glass mixture of K-Al-B-Si-O (KABS) and Zn-B-Si-O (ZBS) is introduced as a sintering aid of alumina to obtain ultralow-permittivity glass/Al2O3 composite. Meanwhile, the factors of glass mixture component on microstructure, phase structure and dielectric properties of the composites are considered systematically. The crystal structure measured by X-ray diffraction (XRD) shows that pure crystalline phase of ZnAl2O4 spinel can be attained by tailoring the component of the glass mixture. In case of mass ratio of KABS: ZBS equal to 6:4, it favors to efficiently increase the sintering densification of composite, and significantly benefit the low dielectric loss, good mechanical and thermal performances. In detail, the optimal glass/ceramic composites sintered at 850 °C for 2 h exhibit the bulk density of 2.89 g/cm3, εr of 4.92 at 14 GHz and Q × f of 6873 GHZ, flexural strength of 202 MPa, thermal expansion coefficient of 5.5 ppm/°C. The above study provides an effective approach for preparing the novel composites as a promising candidate for LTCC applications. 相似文献
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在工业生产条件下,对NB207 型变换催化剂进行了低汽气比低变侧流试验。结果表明,催化剂低温活性好,活性稳定,CO转化率维持在95 % 左右;低变出口冷凝液中甲醇生成量在500 ×10 -6 左右,远低于工厂设计指标。 相似文献