脲醛

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 .

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 .

脲醛树脂胶粘剂~（13）C核磁共振分析

~ ( 13 ) C NMR spectra analysis of urea-formaldehyde resin

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 .

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

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

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

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 .

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

高分子聚合物：脲醛树脂、PVC。

Macromolecule polymers : urea-formaldehyde resin , PVC .

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 .

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

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

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

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

MDF纤维中脲醛胶含量的定量分析

Quantitative analysis of UF resin content in MDF fiber

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 .

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 .

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 .

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

~（13）C-NMR研究脲醛树脂的结构

Structural Analysis of Urea Formaldehyde Resins by ~ ( 13 ) C-NMR Spectrometry

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 .

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 .

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

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 .

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

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 .

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 .

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 .

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 .