聚甲醛

Methods The effect of factors such as reaction temperature, pH, formaldehyde-urea moleratio, contents of PVA and melamine upon the viscosity of the MUF resin, stability, water resistance and the quality of MUF resin.

方法反应温度、pH值、甲醛尿素摩尔比、PVA的用量、三聚氰胺的用量等对脲醛树脂胶液的粘度、稳定性、耐水性、胶合质量的影响。

The MUF which deal with ammonia can has low emission of free-formaldehyde, but the adhesive strength decrease.

用氨水后期处理制得的三聚氰胺改性脲醛树脂胶粘剂，游离甲醛含量明显减少，但是影响胶粘剂的胶合强度

Most primary use of it is raw material for melamine formaldehyde resin, which is high hardness, noninflammable, resisting water, heat, aging, electric arc and chemical corrosion, with good insulation performance, gloss and mechanical strength, widely used in wood, plastic, coating, papermaking, textile, leather, electrical and pharmaceutical industries.

最主要的用途是作为生产三聚氰胺甲醛树脂的原料，该树脂硬度较高，不易燃，耐水、耐热、耐老化、耐电弧、耐化学腐蚀，有良好的绝缘性能、光泽度和机械强度，广泛运用于木材、塑料、涂料、造纸、纺织、皮革、电气、医药等行业。

A review is made of the history, current research situation and modification methods of wood adhesives in China, placing emphasis on three traditional types of formaldehyde-based resin wood adhesive and polyvinyl acetate emulsion used in panels second processing and furniture production, The development trend of wood adhesives in China is also summarized.

介绍了木工用胶粘剂发展的历史和研究现状及改性方法，重点是综合了传统木工用三种甲醛类胶粘剂和人造板二次加工及家具生产用聚乙酸乙烯酯乳液胶的研究进展，同时提出了木工胶粘剂的发展趋势。

Phenolic-doped melamine-formaldehyde aerogels were investigated by adding resorcin to MF sol before the formation of crosslink. The solvents in wet gel were then exchanged with ethanol.

以三聚氰胺和甲醛为原料制备MF气凝胶，在凝胶化过程中加入酚类化合物对MF体系进行改性，获得相应的湿凝胶，湿凝胶经超临界干燥，制备出密度为最低可达50 kg·m-3的酚改性MF气凝胶。

The following was studied in this paper:(1) The adhesive strength of polyvinyl alcohol with different degree of polymerization and different degree of alcoholysis (2) The adhesive strength of polyvinyl acetals with different acetalization degree (3) Effects of polyvinyl acetate on adhesive strength of white glue when PVA or polyvinyl acetals was used as its protective colloid.

本文主要研究以下内容：(1)不同聚合度、醇解度聚乙烯醇溶液粘接强度；(2)不同缩醛度的聚乙烯醇缩醛溶液的粘接强度；(3)聚乙烯醇或聚乙烯醇缩甲醛为保护胶体时，聚醋酸乙烯酯乳液的粘接强度，以及研究白乳胶改性物，制备高粘度和高粘接强度的白乳胶。

The results showed MMT/amino-resin prepolymer can be obtained by the synthesis of MMT, amido materials and formaldehyde after sodium bisulfite process.

试验结果表明，用MMT、氨基物与甲醛进行合成，亚硫酸氢钠磺化得到MMT-氨基树脂预聚体，然后加入改性后的水玻璃得到最终产品。

The yield was 84%. With OP-10, NPE as the the catalyzer for the diazo reaction, the use of hydrolyzed propenenitrile instead of propenoic acid, and OP-10 as the catalyzers of the aminate reaction, these experiments showed the feasibility of industralization, due to the much reduced costs, shortened reaction time and a higher yield.

采用壬基酚聚氧乙烯醚（OP-10）、萘磺酸甲醛缩合物作重氮化反应催化剂，丙烯腈加成、水解替代丙烯酸，OP-10做氨化反应催化剂，通过四因子三水平正交试验法实验，得到较佳反应参数，反应时间、收率、成本都大大降低，适宜工业化生产。

Poly( N -vinyl-2-pyrrolidone)protected nanoclusters of platinum was used as catalysts in the hydrogenation of m -phenoxy benzaldehydeto form high purity m -phenoxy benzalcohol.

研究了常压下聚N -乙烯基 2 -吡咯烷酮保护的铂金属簇催化剂催化间苯氧基苯甲醛加氢制备高纯间苯氧基苯甲醇的反应。

Leading products are urea, ammonium bicarbonate, methanol, hydrogen peroxide, melamine, isopropylamine, formaldehyde, urotropine, and so on. 2005 sales revenue will reach 1 billion yuan, and profits and taxes will reach 82 million yuan.

主导产品有尿素、碳酸氢铵、甲醇、双氧水、三聚氰胺、异丙胺、甲醛、乌洛托品等。2005年销售收入将达到10亿元，实现利税将达到8200万元。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。