木材用湿固型聚氨酯胶粘剂的研制

以聚己内酯二醇(PCL)、聚己二酸丁二醇酯二醇(PBA)和二苯基甲烷4,4′-二异氰酸酯(MD I)等为主要原料制备了湿固型聚氨酯胶粘剂,研究了NCO质量分数、增粘树脂、催化剂和相对湿度等因素对聚氨酯胶粘剂性能的影响。     

环氧树脂对层压复合用水性聚氨酯性能的影响

采用异佛尔酮二异氰酸酯(IPDI)、聚己二酸丁二醇酯(PBA)、二羟甲基丙酸(DMPA)、环氧树脂等原料制备了层压复合用水性聚氨酯(WPU)胶粘剂,考查了环氧树脂用量对其性能的影响。结果表明,随着环氧树脂用量的增加,WPU乳液黏度增加,粒径逐渐变大,稳定性变差;经环氧树脂改性的WPU,胶膜的耐水性优于未改性胶膜,力学性能得到提高。     

小分子扩链剂对水性聚氨酯胶粘剂性能的影响

采用聚己二酸丁二醇酯二醇(PBA)作为软段,异佛尔酮二异氰酸酯(IPDI)作为硬段,通过亲水扩链剂2,2-二羟甲基丙酸(DMPA)在分子链上引入亲水基团.分别使用1,4-丁二醇(BDO)、乙二醇(EG)、乙二胺(EDA)为小分子扩链剂进行扩链反应,经自乳化合成水性聚氨酯胶粘剂乳液,并对水性聚氨酯乳液及胶粘剂的结构和性能...     

硅烷偶联剂对层压复合用WPU胶粘剂的改性研究

采用异佛尔酮二异氰酸酯(IPDI)、聚己二酸丁二醇酯二元醇(PBA)、二羟甲基丙(DMPA)、硅烷偶联剂(KH550)等原料制备了层压复合用水性聚氨酯胶粘剂(WPU),考查了KH550用量对其性能的影响。结果表明,随着KH550用量的增加,WPU乳液黏度增加,稳定性变差;经KH550改性的WPU,胶膜的耐水性优于未改性者,胶膜的力学性能和复合薄膜T型剥离强度也得到提高。     

可控降解聚氨酯弹性体的合成和水解性能研究

分别以聚己二酸乙二醇酯二醇(PEA)或聚己二酸丁二醇酯二醇(PBA)为软段,4,4′-二苯基甲烷二异氰酸酯(MDI)和1,4-丁二醇(BDO)为硬段,采用一步法合成2种聚氨酯弹性体(PUE).研究了软段种类、酸添加剂种类和用量对PUE水解的影响.结果表明:由PBA软段合成PUE的100％定伸强度、拉伸强度、断裂伸长率、...     

金属粘接用溶剂型封闭聚氨酯胶粘剂的制备及性能

采用二苯基甲烷-4,4'-二异氰酸酯(MDI)和聚己二酸-1,4-丁二醇酯二醇(PBA)合成了一系列的聚氨酯预聚物.以丁酮肟作为封闭剂,以异佛尔酮二胺(IPDA)和4,4'-二氨基二环己基甲烷(PACM)为扩链剂,以甲苯和乙酸乙酯混合溶液作为溶剂,制备了溶剂型封闭聚氨酯胶粘剂.对聚氨酯的合成、封闭和解封以及封闭聚氨酯固...     

装饰用聚氨酯胶粘剂的研究

研究了以聚氨酯为主体材料的装饰用胶粘剂的基础配方,考察了聚酯多元醇的分子量、扩链剂的用量、异氰酸酯的种类以及增粘树脂的种类。得出了较好的聚氨酯装饰用胶粘剂的基础配方:选择分子量为2500的PBA和MDI为原料,选择1．4-丁二醇为扩链剂(摩尔比BDO／PBA为0．4),溶剂为低毒混合溶剂,并添加10％左右的叔丁基酚醛树脂。此配方的剥离强度为100N／25mm,终粘强度为2．8MPa。     

溶剂型聚氨酯鞋用胶的合成

研究了溶剂型聚氨酯鞋用胶粘剂,探索了合成的最优工艺条件,并进行了性能测试。胶粘剂采用PBA2000、BDO、TD180／20在溶剂丁酮下合成预聚体。最优条件为:扩链剂BDO与PBA摩尔比为0．4,异氰酸酯指数R控制在0．98-0．99范围,丁酮为首选溶剂,以二乙烯三胺和二丁基二月桂酸锡作复合催化剂,反应温度为75-85℃,反应时间为3h。合成的溶剂型聚氨酯胶粘剂具有良好的剥离强度和综合性能,添加(0．2-0．3)％的固化剂JQ-6能提高胶粘剂的最终剥离强度(20-30)％。     

低亲水基含量丙烯酸酯-聚氨酯复合乳液及其膜性能的研究

采用自乳化的工艺,以异佛尔酮二异氰酸酯(IPDI)、聚已二酸丁二醇酯(PBA)、二羟甲基丙酸(DMPA)、丙烯酸酯为主要原料,制备了一系列稳定的高固含量聚氨酯-丙烯酸酯复合乳液(PUA)。研究了在DMPA用量最低为0.8%(占固含量的百分比),固含量为40%左右的条件下,PBA的分子量、DMPA的用量、PU/PA对PUA乳液性能及其涂膜性能的影响。     

纳米SiO_2改性水性聚氨酯胶粘剂的制备及性能

以PBA(聚酯二元醇)、IPDI(异佛尔酮二异氰酸酯)、DMPA(2,2-二羟甲基丙酸)和BDO(1,4-丁二醇)为原料,DBTDL(二月桂酸二丁基锡)为催化剂,TEA(三乙胺)为中和剂,乙二胺为扩链剂,水为介质,采用共混法和原位聚合法合成了纳米SiO_2(纳米二氧化硅)改性WPU(水性聚氨酯)胶粘剂。研究结果表明:纳米SiO_2能有效提高WPU胶膜的热稳定性,并且采用原位聚合法制得的纳米SiO_2改性WPU胶粘剂之性能优于共混法;当w(纳米SiO_2)=2.0%、w(DMPA)=4.7%(均相对于预聚体质量而言)和R=n(—NCO)/n(—OH)=3.0时,采用原位聚合法制得的纳米SiO_2改性WPU胶粘剂的综合性能相对最佳。     

Effects of surface modification by oxygen plasma on peel adhesion of pressure‐sensitive adhesive tapes

Surfaces of poly(isobutylene) (PIB) and poly(butylacrylate) (PBA) pressure‐sensitive adhesive tapes were treated by oxygen plasma, and effects of surface modification on their adhesive behavior were investigated from the viewpoint of peel adhesion. The peel adhesion between PIB and PBA pressure‐sensitive adhesive tapes and stainless steel has been improved by the oxygen plasma treatment. The surface‐modification layer was formed on PIB and PBA pressure‐sensitive adhesive surfaces by the oxygen plasma treatment. The oxygen plasma treatment led to the formation of functional groups such as various carbonyl groups. The treated layer was restricted to the topmost layer (50–300 nm) from the surface. The GPC curves of the oxygen plasma‐treated PBA adhesive were less changed. Although a degradation product of 1–3% was formed in the process of the oxygen plasma treatment of the PIB adhesive. There are differences in the oxygen plasma treatment between the PIB and PBA adhesives. A close relationship was recognized between the amount of carbonyl groups and peel adhesion. Therefore, the carbonyl groups formed on the PIB and PBA adhesive surfaces may be a main factor to improve the peel adhesion between the PIB and PBA adhesive and stainless steel. The peel adhesion could be controlled by changing the carbonyl concentration on the PIB and PBA adhesive surfaces. We speculate that the carbonyl groups on the PIB and PBA adhesive surface might provide an interaction with a stainless steel surface. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 1392–1401, 2000     

Effects of nitrogen plasma treatment of pressure-sensitive adhesive layer surfaces on their peel adhesion behavior

The influence of the surface modification of pressure-sensitive adhesive tapes on their adhesion behavior has been investigated. PBA [poly(butyl acrylate)] and PIB [poly(isobutylene)] adhesives were chosen as pressure-sensitive adhesives and nitrogen plasma was used for the surface modification of the adhesives. The peel force of PBA or PIB adhesive/stainless steel joints was evaluated. The nitrogen plasma treatment showed large effects on the adhesion behavior of both the PBA and the PIB adhesives. The peel force for the PBA adhesive/stainless steel joint decreased by 57 times as a result of the nitrogen plasma treatment and that for the PIB adhesive/stainless steel joint increased by 2.2 times. There are essential differences in the modification reactions caused by the nitrogen plasma between the PBA and PIB adhesives. For the PBA adhesive, cross-linking reactions occurred among the PBA polymer chains and the surface was hardened. For the PIB adhesive, degradation reactions occurred and products with a low molecular weight were formed on the surface. These differences are due to the different responses of the PBA and PIB adhesives towards the nitrogen plasma. The mechanism of the changes in adhesion behavior caused by the nitrogen plasma is discussed.     

卡基材料用水性聚氨酯覆膜胶的合成及应用

以异佛尔酮二异氰酸酯(IPDI)、聚己二酸丁二醇酯(PBA)、聚氧化丙烯二醇(PPG)、聚四氢呋喃二醇(PTMG)、二羟甲基丁酸(DMBA)和甲基丙烯酸-β-羟乙酯(HEMA)等为主要原料,合成了卡基材料用阴离子型WPU(水性聚氨酯)覆膜胶。研究结果表明:采用单因素试验法优选出制备WPU覆膜胶的最优配方是初始R=n(-NCO)/n(-OH)=4、m(PPG):m(PTMG):m(PBA)=10:20:70、w(DMBA)=5.5%和w(HEMA)=4.5%(相对于预聚体用原料总质量而言),此时活泼的-NCO基已被封闭,羟基丙烯酸酯已成功引入到WPU大分子链中;与普通WPU覆膜胶相比,由最优配方制成的WPU覆膜胶的固含量(41%)较高、剥离强度较大且稳定性较佳,将其应用于卡基材料中,可得到高剥离强度和高耐湿热老化性能的覆膜色卡。     

Mechanical property enhancement of non‐bonding electrospun mats via adhesive

In the present study, the effect of adhesive on the morphology of different electrospun polymeric mats was investigated. The modification of two polymers, poly(methyl methacrylate) and poly(vinyl chloride), was carried out by blending the polymers with different amounts of poly(butyl acrylate) (PBA) adhesive to investigate the effect of different amounts of adhesive with heat hardener in hybrid mats. The introduction of various concentrations of PBA into different polymer solutions led to the formation of point‐bonded electrospun fibrous mats. Scanning electron microscopy images indicated that point‐bonded polymer/adhesive fibers were uniformly distributed throughout the mats. Fourier transform infrared spectrometry, contact angle measurements and thermogravimetric analysis were used to study the different properties of the hybrid mats. The tensile strength of the blended fibrous electrospun mats was increased effectively. This enhancement of the mechanical properties of the mats due to the presence of adhesive increases the number of potential applications of the electrospun mats, especially for mechanically weak polymers. Copyright © 2012 Society of Chemical Industry     

Poly(butyl acrylate)/poly(vinylidene fluoride-co-hexafluoroacetone) blends as pressure-sensitive adhesives

The pressure-sensitive adhesive (PSA) properties and dynamic mechanical properties were measured for the poly(butyl acrylate) (PBA)/poly(vinylidene fluoride-co-hexafluoroacetone) [P(VDF-HFA)] blends. The PSA properties of PBA adhesive could be controlled by blending P(VDF-HFA). In order to investigate the relationship between PSA properties and dynamic mechanical properties for PBA/P(VDF-HFA) blends, the master curves of the dynamic mechanical properties, such as storage modulus G′, loss modulus G′′, and dynamic loss tangent tan c, were constructed with the temperature-rate superposition principle. The probe tack and peel strength for PBA/P(VDF-HFA) blends were correlated with G′ and G′′. Since the G′ and G′′ values increased with increasing P(VDF-HFA) content, the holding power of PBA adhesive could be advanced by blending P(VDF-HFA). © 1997 John Wiley & Sons, Inc.     

Adhesion at Poly(Butylacrylate)-Poly(Dimethylsiloxane) Interfaces

We present an investigation of the adhesion modulation mechanisms of silica-like nanoparticles (MQ resins) incorporated in polydimethylsiloxane (PDMS) elastomers and acrylic adhesives. The Johnson-Kendall-Roberts (JKR) test has been used to gain information on the both zero velocity and the velocity dependence of the adhesive strength, avoiding as much as possible contributions to the adhesive strength of bulk dissipation in the adhesive (which is not the case with peel tests). As the incorporation of the MQ resins into the elastomers deeply affects their own mechanical properties, the loading and unloading curves of small poly(butylacrylate) (PBA) lenses on either PDMS elastomers, adsorbed PDMS and pure MQ resin layers are compared in a systematic manner. The PBA chains are observed to have a neat affinity for the MQ resin nanoparticles. When MQ resins are present at the interface, they tend to prevent facture propagation, thus producing a larger deformation of the PBA lens. The modulation of adhesion is then dominated by the corresponding dissipation inside the acrylic adhesive.     

Adhesion at Poly(Butylacrylate)–Poly(Dimethylsiloxane) Interfaces

We present an investigation of the adhesion modulation mechanisms of silica-like nanoparticles (MQ resins) incorporated in polydimethylsiloxane (PDMS) elastomers and acrylic adhesives. The Johnson-Kendall-Roberts (JKR) test has been used to gain information on the both zero velocity and the velocity dependence of the adhesive strength, avoiding as much as possible contributions to the adhesive strength of bulk dissipation in the adhesive (which is not the case with peel tests). As the incorporation of the MQ resins into the elastomers deeply affects their own mechanical properties, the loading and unloading curves of small poly(butylacrylate) (PBA) lenses on either PDMS elastomers, adsorbed PDMS and pure MQ resin layers are compared in a systematic manner. The PBA chains are observed to have a neat affinity for the MQ resin nanoparticles. When MQ resins are present at the interface, they tend to prevent facture propagation, thus producing a larger deformation of the PBA lens. The modulation of adhesion is then dominated by the corresponding dissipation inside the acrylic adhesive.     

Effect of model fillers on the adhesive strength of pressure-sensitive tapes

—The effect of various model fillers, namely glass beads, 'Spheriglass', and PTFE powder, on the adhesive strength of natural rubber (NR) and poly(n-butyl acrylate) (PBA) tapes has been investigated. Glass fillers treated with alkyl chlorosilane were also used. The adhesive strength was measured over a range of rates and temperatures, and corrections for the thickness of the adhesive and volume fraction of the polymer were introduced into the rate term. It was observed that the adhesive strength of PBA tapes filled with 20% PTFE is comparable to that of the control sample without filler. The strength measured over a range of strain rates increased for both untreated and treated Spheriglass-filled adhesives. Filled NR adhesives showed an enhanced strength only at very high strain rates. With 40% PTFE, this increase was quite apparent. The mechanism of improvement of the strength of adhesion due to the incorporation of a filler is explained. The addition of a filler introduces an additional mechanism of energy dissipation during deformation of the adhesive and a higher energy will be expended due to debonding of the filler and hysteresis.     

透明聚酯型水性聚氨酯的制备与性能研究

聚酯型WPU(水性聚氨酯)具有较高的力学强度和粘接强度,但是其较高的结晶性会导致胶膜透明性较差。以聚丙二醇(PPG)、聚己二酸丁二醇酯二醇(PBA)、异佛尔酮二异氰酸酯(IPDI)、2,2′-二羟甲基丙酸(DMPA)和1,4-丁二醇(BDO)等为原料,制备PPG改性聚酯型WPU。研究结果表明:PPG改性聚酯型WPU的黏度适中,储存稳定性良好;随着PPG含量的不断增加,WPU胶膜的透明性因结晶受阻程度增大而变好,相应胶粘剂的T型剥离强度和拉伸强度下降,而断裂伸长率升高;当w(PPG)=10%～20%时,相应WPU胶粘剂的透明性、T型剥离强度(≥1.97 N/mm)、拉伸强度(≥14.7 MPa)和断裂伸长率(≥421%)俱佳。