脲醛
- 网络Urea;duroplastic;MUF
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目前,脲醛(UF)树脂胶粘剂是木材行业中使用量最大的一种胶粘剂。
At present , urea formaldehyde ( UF ) resin adhesives are the most widely used adhesives in wood products industry .
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采用异氰酸酯(ISO)改性的脲醛树脂胶制造低密度稻壳-木材复合材料。
This work employed isocyanate ( ISO ) / urea formaldehyde ( UF ) resin system with different ratio to develop low-density rice husk / wood composite .
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脲醛树脂胶粘剂~(13)C核磁共振分析
~ ( 13 ) C NMR spectra analysis of urea-formaldehyde resin
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升温速率越快,pH初始下降值越大,脲醛树脂的聚合速率也越快。
And the changes of pH value became larger with faster heating rates .
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改性脲醛树脂的合成及其在E1级刨花板生产中的应用
Synthesis of Modified UF Resin and Its Application in the Manufacture of E_1 Particleboard
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E1级胶合板用脲醛树脂的~(13)cNMR定量分析
Quantitative ~ ( 13 ) C NMR Analysis of Urea-formaldehyde Resin for E_1-type Plywood
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PD-3改性中温合成脲醛树脂的探索
Discussion on synthesis of UF-resin Modified by PD-3 under Middle Temperature
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脲醛树酯胶固化时间随3种灌木材的pH值和减缓冲容量的增加而增长。
The setting time of UF increases with the increase of wood pH and alkali buffering capacity .
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三种杨木的pH值、缓冲容量及其对脲醛树脂胶固化时间的影响
The pH data buffer capacity of three poplar and their effects on the setting time of UF resin
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高分子聚合物:脲醛树脂、PVC。
Macromolecule polymers : urea-formaldehyde resin , PVC .
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本文采用在脲醛预聚物合成中分别加入助剂P和填料M来对其进行化学改性,并对改性结果进行了研究分析。
In the paper , we added the auxiliary of P and filler of M to the system , and studied the results of the modification .
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六种沙生灌木pH值、缓冲容量及对脲醛树脂胶(UF)固化时间的影响
PH Value and Buffering Capacity of 6 Shrub Species and Relevant Effects on Curing Time of UF Resin
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超声波在纳米SiO2与脲醛树脂共混中的应用
Ultrasonic application to the mixture of nano-SiO_2 and UF resin
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原位复合纳米SiO2改性脲醛木塑复合材料制备
Preparation of In-situ Compounded Nano-SiO_2 Modified Urea-formaldehyde Wood-Plastic Composite
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SiO2改性胶合板用脲醛树脂的研究
Study on urea-formaldehyde resin modified by SiO_2 for plywood
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MDF纤维中脲醛胶含量的定量分析
Quantitative analysis of UF resin content in MDF fiber
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采用DSC分析技术,研究了麦秆纤维板用脲醛树脂的固化动力学。
A study on curing dynamics of UF resin for wheat straw fiber board has been carried outby DSC analysis .
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研究结果表明脲醛树脂的化学结构主要受甲醛/尿素的摩尔比,pH值、反应温度和反应时间的影响。
The results from analysis showed that the structure of urea formaldehyde resins was affected by F / U mole ratio , pH value , reaction time and temperature .
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介绍在采用E1级脲醛树脂胶的情况下,生产E1级刨花板对设备、胶粘剂、刨花制备、热压工艺及检测的要求。
An account is given of the requirements for equipment , adhesive , particle preparation , hot-pressing technology and testing methods when producing Grade E_1 particleboard with E_1 UF resin .
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纳米SiO2和CaCO3改性脲醛树脂甲醛含量及性能研究
Study on Using Nanometer SiO_2 and CaCO_3 for the Free Formaldehyde Content of the UF Resin
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~(13)C-NMR研究脲醛树脂的结构
Structural Analysis of Urea Formaldehyde Resins by ~ ( 13 ) C-NMR Spectrometry
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同时针对不同的脲醛树脂,要采取不同的工艺措施;(3)将单板用BL&甲醛消纳剂浸渍后再按正常工艺生产的胶合板可达到环保E0级标准,且胶合强度有保证。
The formaldehyde emission of the plywood made of veneers soaked by BL-formaldehyde absorptive can accord with the E_0 class standard , and the bonding strength can be assured at the same time .
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以酚醛树脂(PF)为基础,与不同加量的脲醛树脂(UF)复合,形成一系列复合胶粘剂。
Adding different amount of urea-formaldehyde ( UF ) resin in phenolic ( PF ) resin , the combined adhesive was obtained .
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Fe~(2+)/H2O2催化氧化脲醛树脂胶中游离甲醛及其对性能的影响
Removing Free Formaldehyde From Urea-Formaldehyde Resin Adhesive By Means of Fe ~ ( 2 + ) / H_2O_2 Catalytic Oxidation and Its Effects on Performance of the Adhesive
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对改性后产品进行红外表征,研究PPE改性脲醛树脂的结构特点。
The structure of modified product was characterized by IR spectrum in the research of its structural feature .
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脲醛树脂化学结构及反应的13C-NMR研究
A Study on Chemical Structure and Reaction of Urea-formaldehyde Resin by ~ ( 13 ) C-NMR Spectrometry
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在硫酸亚铁与脲醛树脂组合成的单液法复合调剖剂中,加入一定量的尿素并适当提高脲醛树脂溶液的pH值,可以显著提高其稳定性。
Addition of certain amount of urea and appropriate increase of the pH value of urea formaldehyde solution in the composite profile control agent consisted of ferrous sulfate and urea-formaldehyde resin may result remarkable increase in its stability .
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本研究以有机固化剂和无机固化剂复配,其中有机固化剂为改性脲醛树脂,无机固化剂由水泥、粉煤灰和烧碱组成,制备了固化剂FL。
The solidifying agent FL was compounded by organic urea-fomaldehyde ( UF ) resin and inorganic cement , coal ash , and caustic soda .
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用3种低毒脲醛树脂胶粘剂压制胶合板及中密度纤维板试验,对不同固化体系UF树脂胶粘剂的胶接性能和甲醛释放量进行了研究。
The bonding properties and formaldehyde emission of UF resin in different curing systems were studied by pressing plywood and MDF bonded with low toxicity UF resin .
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采用粒度分析仪测定纳米SiO2在脲醛树脂的分散状态,并运用正交试验手段,研究改性低毒脲醛树脂的最佳制备方法。
The diffusion state of nano-SiO_2 was determined by particle size analysis and the optimum preparation method for modified UF resin with low toxicity was studied through orthogonal experiments .