In this paper,using bisphenol A epoxy resin as the matrix,TEPA as the curing agent,silver-plating copper powder as the conductive filler and AA-75 as the dispersant,the silver-plating copper filled epoxy conductive adhesive was prepared.DC low-resistance tester is used to measure the volume resistivity,infra-red spectrometry is used to characterize the adhesives with different amount of curing agent and differential scanning calorimetry is used to determine the optimal curing reaction temperature.The result showed that under the optimal proportions and process conditions the volume resistivity of conductive adhesive is 8.9×10-4 Ω·cm.

It is necessary to improve the adhesion of the cured rubber to a substrate as it is used extensively. It is well known that an improvement in adhesion can be realized by incorporating in the composition a sliane or siloxane. Although the composition provides good adhesion to many kinds of substrates, it has been found that the adhesive bond degrades rapidly under wet conditions. To be solved it, rosin eater was incorprated in the silcone ruber in the paper. Increasing the content of rosin ester could induce a relative high adhesion in hot water. Moreover, when the content of modified rosin pentaerythritol ester was above 4.5 phr, the immersion days in hot water before adhesive failure occured were three times than that of non-additive rosin esters.

Reinforcement of calcium carbonate on silicone rubber was discussed in detail at particle sizes and surface performance.The reason was analyzed through isotherm of stress-strain and DMAT.It was thought that the mechanism of calcium carbonate composite particles reinforced silicone rubber was not the same as calcium carbonate treated by fatty acid reinforced.The role in silicon membrane and the rubber takes effect mainly between calcium carbonate composite particls and rubber matrix.Calcium carbonate composite particles are suitable for high-modulus structural adhesive because their resistance displacement ability is better than what of others.

The atomic oxygen(AO) resistance of the thermal control coatings was tested by the ground-based simulation facility of coaxial source atomic oxygen and the mechanism of AO resistance was studied by using attenuated total-internal reflection fourier transform infrared spectroscopy(ATR FT-IR),X-ray photoelectron spectroscopy(XPS) and scanning electron microscopy(SEM).The results show that the thermal control coatings which was made by low molecular vinyl rubber have the good resistance of AO exposure,and the filler ZnO coated by potassium silicate will make the resistance of AO exposure of the additional silicone rubber decrease.

The one component RTV silicone sealant was prepared by silane coupler as surface modifier of superfine CaCO3.The influences of kinds,content and surface modified ways of silane coupler were discussed on the sealant performance.The research results showed that the modified methods of CaCO3 surface prior treated by silane coupler was better.Thereinto the enhancement effect of CaCO3 treated by A-189(the tensile strength was 0.57 MPa,elongation ratio in maximum strength was 159.60%) on sealant performance was better,but the sealant has phenomenon of obvious delay vulcanization because demoulding time need 5 days.The enhancement effect of CaCO3 treated by KBE-402(the tensile strength was 0.60 MPa,elongation ratio in maximum strength was 105.00%) on sealant performance was better than by KBM-403.

Nano-SiO2、fumed SiO2、nano-TiO2、nano-CaCO3 particles were introduced into the pressure sensitive adhesive emulsion of polyacrylate via in-situ emulsion polymerization.The influences of nanoparticle type on emulsion polymerization stability and pressure sensitive properties of composite emulsions were studied.When nano-SiO2,nano-TiO2 particles were introduced,it was discovered that the emulsion polymerization stabilities were excellent and properties of composite emulsions were improved.It was also confirmed that the stability and pressure sensitive properties of nano-SiO2 composite emulsions were not deteriorated after three-month storage.Oppositely,for fumed SiO2、nano-CaCO3,there were higher gelling rate,and whatever the peeling force was the degumming and transfer of adhesive existed.

Polyacrylate/SiO2 organic-inorganic nanocomposite emulsions as pressure sensitive adhesives have been prepared by insitu emulsion polymerization.It was clear that SiO2 particles can be availably dispersed to primary structure and can participate in the composite reaction with polyacrylate on nanoscale dimensions.It was also confirmed that nanocomposite emulsions behave better pressure sensitive properties.In addition to slight reducement of tack,hold strength was slightly improved,and peel strength was remarkedly enhanced by 30%.No residues or gels appeared when the polymerization reaction was magnified 150 times in 700 litre vessel.It has been found that the magnified samples possess the same properties as common experiments.

研究硫化剂DCP、硫化剂双2 5和两者并用硫化体系对甲基乙烯基硅橡胶(MVQ)/ACM并用胶料硫化特性的影响。结果表明,硫化剂DCP和硫化剂双2 5硫化的胶料最大转矩(MH)均随硫化剂用量的增大先增大后减小,硫化效果均较好。采用硫化剂双2 5/硫化剂DCP并用体系硫化的胶料能获得更快的硫化速度,且MH较大;当硫化剂双25/硫化剂DCP并用比为0.15/0.5时,MH高达20 dN.m,比硫化剂双25或硫化剂DCP单用时提高约30%。进行二段硫化有利于提高MVQ/ACM并用胶的物理性能,二段硫化温度为200℃时,硫化时间以3~4h为宜。

Polyacrylate/nano-SiO_2 composite emulsions used as pressure sensitive adhesives have been successfully prepared via in-situ emulsion polymerization.Although the surface of nano-SiO_2 was not organically modified,it was discovered through transmission electron microscope that SiO_2 particles can be availably dispersed to primary structure and can participated in the composite reaction with polyacrylate on nanometer scale.It was clearly observed that SiO_2 nanoparticles were embedded within the polymer latex particles,which exhibited a distinctive raspberry morpaology.It was also confirmed that composite emulsions behave better pressure sensitive properties.In addition to slight reducement of tack,hold strength was improved,and peel strength was remarkedly enhanced by 30%.

Nano-SiO_2 particles were introduced into polyacrylate via in-situ emulsion polymerization. The influences of nano-SiO_2 introducing method、emulsifier ratio and seed emulsion source on dispersivity of nano-SiO_2 were studied. It was discovered through TEM and particle size analysis that SiO_2 can be availably dispersed with primary particle structure and participate in the composite reaction with polyacrylate on nanometer scale. It was clearly observed that SiO_2 nanoparticles were embedded within the latex particles, which exhibited a distinctive "raspberry" morpaology.

Polyacrylate/nano-SiO2 organic-inorganic composite emulsions as pressure sensitive adhesives have been successfully prepared via in-situ emulsion polymerization. It was observed through TEM that SiO2 particles can be availably dispersed to primary structure and can participate in the composite reaction with polyacrylate on nanometer scale. It was also confirmed that nanocomposite emulsions exhibit better pressure sensitive properties,as compared to acrylic emulsions. Effect of content of nano-SiO2,hard monomer,functional monomer and emulgent added methods on pressure sensistive adhesive properties were discussed. And the organic-inorganic nanocomposite emulsions were still stable after three months.

The domestic and overseas progress of developments and applications of high temperature resistant PSA tapes was summarized in this paper. The various kinds of heat resistant PSA tapes,such as thermoset,solvent-based, emulsion-based, orga-nosilicon-based,radiation curable,and hot melt type etc. ,were respectively introduced.

A methyl silicone thermosetting resin was obtained from the co-hydrolyze and co-poly condensation of a mixed compound of methyltriethoxyl silane,dimethyl diethoxyl silane and tetraethoxyl silane, this resin is used as a raw material,and a curing accelerator and coupling agent are added in it to manufactrue a closed agent solution which is used in closed treatment of some metals after electrolpationg.Moreover, the effect of curing condition of this closed agent on its properties is investigated in this paper.

A new hexa-functional ethylidyne siloxane was synthesized through hydrosilicone addition reaction, and the siloxane was characterized by FT-IR spectra and GC-MS spectra. It was found that the characteristic absorption of -C= C- and H Si- completely disappeared, and the characteristic absorption of Si-CH2 CH2-Si was observed in FT-IR spectra of the siloxane. This kind of siloxane was used as a cross-linked reagent to prepare two-component de-alkoxy RTV (room temperature vulcanization) electroconductive silicone rubber mixed with 107# silicone rubber, acetylene carbonize black, fillers and catalyst.Electroconductivity and general properties were investigated through orthonormal experiments, and the optimized formulation of RTV electroconductive silicone rubber was proposed. The experimental results showed that the dominant factor was acetylene carbonize black, and the optimized formulation of RTV electroconductive silicone rubber arose when 107# silicone rubber was 100, carbonize acetylene black was 75, fumed silica was 5.0, hexa-functional ethylidyne siloxane was 2. 0 and structure-controlled reagent was 2.0.

Development and formation mechanism of inorganic-organic nanocomposite emulsion prepared by in situ emulsion polymerization was summarized.Then,the inorganic-organic nanocomposite emulsion used as pressure-sensitive adhesive was synthesized.The influence of introducing method of nanoparticles,emulsifier amount and nanoparticle content on properties was studied.

Deketoximized RTV silicone rubber,low-cost and good properties,is important to improve hot water-resistant adhesive property.As a method for that,carboxylic ester was used.The result showed that the sample without added carboxylic ester was peeled off after was immersed in 90℃ hot water for 3 days,and the samples added 3.5 or 4.5 part A or B were 100% cohesive failure after were immersed in 90℃ hot water for 7 days,which is above two times the prior.

Synthesis of polyurethane acrylates (PUA) and preparation of the UV-cured pressure-sensitive adhesives(PSA)were reported. Dynamic viscoelstic properties and thermal properties of UV-cured PSA were measured respectively by DRS and DSC. It was showed that the storage modulus (G') and complex viscosity (Eta*) of PSA improved with increasing the hydroxyl from dimer-based polyester diol/ hydroxyl from hydrogenated castor oil (OHDiol/OHHCO) ratio. Peeling strength of PSA increased and yet holding power fell. As increasing the content of tackifying resin,the G' and Eta* value of PSA decreased and, however,change of tanS indicated good miscibility of tackifying resin with PUA. Increase of tackifying resin enhanced the peeling strength of PSA and weakened the holding power.

A new hexa- functional ethylidene siloxane was synthesized through hydro-silicone addition reaction.Using the compound as cross-linking agent to prepare two-component de-alcohol RTV silicone rubber mixing with 107 silicone rubber ,fillers and catalyst.The net-work topological structure of silicone rubber was improved by this new cross-linking agent, therefore, stress-strain strengh of silicone rubber was elevated.Under the same condition,comparing with general commercial MTMS,the strengh of rubber is 80% higher.

Treated CaCO3/SiO2 by silane couple agents had good dispersion in petrolatum and silicon oil. SEM graph showed treated CaCO3/SiO2 equably dispersed in silicone rubber. CaCO3/SiO2 was well reinforcing filler. Tensile strength of silicone rubber filled by this particle was as double times as filled those treated by fatty acid.