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Zhu Xuezhong - One of the best experts on this subject based on the ideXlab platform.

  • halogen free flame retardant phenolic epoxy glass reinforced plastic molding material
    2013
    Co-Authors: Zhu Xuezhong
    Abstract:

    The invention provides a halogen-free flame retardant phenolic epoxy glass reinforced plastic molding material, belonging to the technical field of polymer materials. The molding material comprises the following raw materials in parts by weight: 50-54 parts of phenolic epoxy resins, 10-15 parts of melamine resins, 4-8 parts of curing Agent, 0.8-1.5 parts of curing accelerator, 6-9 parts of phosphate ester, 3-4 parts of phosphate, 1.3-2.2 parts of Release Agent, 44-48 parts of mineral filler, 1.1-1.5 parts of reinforcing Agent and 25-28 parts of reinforced fibers. The molding material has the beneficial effects that the molding material has the characteristics of good heat resistance, excellent self-extinguishing effect, good strength and convenience in molding; and through tests, the bending strength is 88MPa, the heat deformation temperature is 240 DEG C and the flame retardance reaches grade V-0 (UL-94-V-0 1.6mm).

  • halogen free unsaturated polyester glass reinforced plastic molding material
    2013
    Co-Authors: Zhu Xuezhong
    Abstract:

    The invention provides a halogen-free unsaturated polyester glass reinforced plastic molding material, belonging to the technical field of polymer materials. The molding material comprises the following raw materials in parts by weight: 46-51 parts of unsaturated polyester resins, 32-36.6 parts of low shrinkage additive, 3-5 parts of thermoplastic styrene butadiene rubber (SBS), 0.65-1.1 parts of initiator, 0.006-0.011 part of polymerization inhibitor, 0.16-0.3 part of thickening Agent, 170-210 parts of filler, 2.3-3.1 parts of Release Agent and 36-44 parts of reinforced fibers. The molding material has the advantages that the molding material is characterized in that the molding material has good strength, low shrinkage and excellent electrical property and is halide-free and can be applied to such parts as anticorrosion shells of autos and electrical appliances.

  • preparation method of halogen free unsaturated polyester glass reinforced plastic molding material
    2013
    Co-Authors: Zhu Xuezhong
    Abstract:

    The invention provides a preparation method of a halogen-free unsaturated polyester glass reinforced plastic molding material, belonging to the technical field of preparation of polymer materials. The preparation method is characterized by firstly throwing unsaturated polyester resins and a low shrinkage additive, which are weighed in parts by weight, into a beater to be quickly stirred, then adding an initiator, p-benzoquinone and a thickening Agent, which are weighed in parts by weight, continuing stirring, then transferring the mixture to a kneader to be kneaded, then adding a filler, thermoplastic styrene butadiene rubber and a Release Agent, which are weighed in parts by weight, to the kneader, continuing kneading and finally adding reinforced fibers weighed in parts by weight and then kneading the materials, thus obtaining the halogen-free unsaturated polyester glass reinforced plastic molding material. The molding material has the advantages that the molding material is characterized in that the molding material has good strength, low shrinkage and excellent electrical property and is halide-free and can be applied to such parts as anticorrosion shells of autos and electrical appliances.

  • preparation method of halogen free flame retardant phenolic epoxy glass reinforced plastic molding material
    2013
    Co-Authors: Zhu Xuezhong
    Abstract:

    The invention provides a preparation method of a halogen-free flame retardant phenolic epoxy glass reinforced plastic molding material, belonging to the technical field of preparation of polymer materials. The preparation method is characterized by firstly throwing weighed 44-48 parts of mineral filler, 25-28 parts of reinforced fibers and 1.1-1.5 parts of reinforcing Agent by weight into a container to be mixed for 10-20 minutes, then throwing weighed 50-54 parts of phenolic epoxy resins, 10-15 parts of melamine resins, 4-8 parts of curing Agent, 0.8-1.5 parts of curing accelerator, 6-9 parts of phosphate ester, 3-4 parts of phosphate and 1.3-2.2 parts of Release Agent by weight in sequence, continuing mixing for 15-25 minutes, then transferring the mixture to an open mill to undergo hot mixing for 12-14 minutes and then carrying out tablet drawing, cooling and grinding, thus obtaining the halogen-free flame retardant phenolic epoxy glass reinforced plastic molding material. The molding material has the beneficial effects that the molding material has the characteristics of good heat resistance, excellent self-extinguishing effect, good strength and convenience in molding; and through tests, the bending strength is 88MPa, the heat deformation temperature is 240 DEG C and the flame retardance reaches grade V-0 (UL-94-V-0 1.6mm).

  • halogen free fire retardation and ammonia Release free phenol formaldehyde fiber reinforced plastic material
    2013
    Co-Authors: Zhu Xuezhong
    Abstract:

    The invention relates to a halogen-free fire retardation and ammonia Release-free phenol formaldehyde fiber reinforced plastic material, and belongs to the technical field of polymer materials. The halogen-free fire retardation and ammonia Release-free phenol formaldehyde fiber reinforced plastic material comprises the following raw materials, by weight, 40-44 parts of a phenol formaldehyde resin, 26-30 parts of a thermosetting phenol formaldehyde resin, 4-5 parts of an epoxy resin, 1.8-3.2 parts of a metal oxide, 1.5-2.6 parts of a composite mold Release Agent, 45-49 parts of a mineral filler, 3-5 parts of silicon carbide, 28-33 parts of reinforcing fibers, and 7-10 parts of a fire retardation Agent. The halogen-free fire retardation and ammonia Release-free phenol formaldehyde fiber reinforced plastic material has advantages of good heat resistance, ideal strength, and no ammonia Release during shaping. In addition, test results show that a bending strength is more than 85 MPa, a heat deformation temperature is more than or equal to 240 DEG C, and a fire retardation performance achieves a V-0 level (UL-94-V-01.6mm).

Jun Taniguchi - One of the best experts on this subject based on the ideXlab platform.

  • Improvement of Transfer Durability of a Pillar-Shaped Release-Agent-Free Replica Mold in Ultraviolet Nanoimprint Lithography
    International journal of automation technology, 2018
    Co-Authors: Junpei Tsuchiya, Shin Hiwasa, Nakagawa, Jun Taniguchi
    Abstract:

    Ultraviolet nanoimprint lithography (UV-NIL) can be used to fabricate nanoscale patterns with high throughput. It is expected to serve as a low-cost technique for the production of items in large numbers. However, master molds for UV-NIL are expensive and laborious to produce, and there are problems associated with the deterioration of the master mold and damage to its nanopattern due to adhesion of the UV-curable resin. Consequently, the UV-curable resin has to combine low-viscosity characteristics for coatability with an antisticking property. Coating a master mold with a Release layer is important in preventing damage to the master mold or adhesion between the mold and the UV-curable resin. However, the Released layer deteriorates as the master mold is repeatedly used to fabricate nanopatterns. By contrast, the use of a replica mold is a valuable technique for preventing the deterioration of the master mold, and there have been several studies on the fabrication of replicas of master molds with the use of UV-curable resins. In many cases, the fabrication of nanopatterns with replica molds requires the use of a Release Agent. In a previous study, we developed a material for replica molds that does not require a Release Agent. This material consisted of a UV-curable resin with an antifouling effect that was prepared from cationically polymerizable UV-curable and epoxy-modified fluorinated resins. With the use of this material, replica molds with patterns of pillars or holes were fabricated with UV-NIL. The lifetime of the mold with the nanopattern of pillars was shorter than that with holes. In addition, the replica mold with the pillar-shaped nanopattern had numerous defects and allowed adhesion of the transfer resin after repeated efforts. Herein, we describe an improved Release-Agent-free hard replica mold. We transferred large numbers of nanopatterns of pillars from the replica mold, and evaluated the error rate and contact angle of our improved Release-Agent-free hard replica mold. The resulting Release-Agent-free replica mold with a nanopattern of pillars was capable of transferring up to 1000 sequential imprints. In addition, to improve the Release properties of the transfer resin, we included an additive to the transfer resin that contained a reactive fluorinated material. This material improved the Release properties of the transfer resin and mitigated the deterioration of the contact angle and increase in the error rate.

  • Transfer durability and fidelity of hard Release-Agent-free replica mold by repetition of ultraviolet nanoimprint lithography
    Microelectronic Engineering, 2018
    Co-Authors: Junpei Tsuchiya, Shin Hiwasa, Jun Taniguchi
    Abstract:

    Abstract Ultraviolet nanoimprint lithography provides a high-throughput and cost-effective method to fabricate nanopatterns. However, the master mold deteriorates owing to the adhesion of resin and the occurrence of defects. Prompted by the need to prevent deterioration of the master mold, we developed a new Release-Agent-free replica mold with high toughness and high hardness. We evaluated the durability, error rate, and fidelity of the transfer patterns of the newly developed Release-Agent-free replica molds of hard pillar- and hole-shaped patterns. As a result, the developed replica mold with pillar-shaped patterns exposed to UV radiation at 50 J/cm2 has the best Release properties, and the replica mold with hole-shaped patterns can transfer up to 7000 imprint times under the same conditions.

  • Evaluation of ultraviolet-nanoimprint-lithography Release Agent properties by using TriboIndenter
    Microelectronic Engineering, 2015
    Co-Authors: Kota Funakoshi, Jun Taniguchi, Chiharu Tadokoro, Ian Thomas Clark, Toshiro Okawa, Shinya Sasaki
    Abstract:

    Display Omitted We investigated the surface tribological properties of two Release Agents.The friction and adhesion forces were measured separately.Two kinds of Release Agents were shown different friction and adhesion forces.Our tribological method of evaluating the properties is shown to be effective. The adhesive and friction forces generated in releasing a mold from a resin in the presence of a Release Agent was investigated by using a TriboIndenter. We investigated the surface tribological properties of two ultraviolet-nanoimprint-lithography Release Agents, Optool DSX and trichloro(tridecafluoro-octyl)silane C8H4Cl3F13Si] (F13), to elucidate the mold-Release mechanism. For both Release Agents, we measured the friction and adhesive forces acting on the substrate. The friction force of Optool DSX was found to be lower than that of F13, whereas F13 showed a lower adhesive force than Optool DSX. Our previous results revealed that the durability of Optool DSX as a Release Agent was better than that of F13. Examining our previous and current results, we saw that the trends in the contact angle and the number of defects with increasing imprinting counts coincide with the trends in the friction and adhesive forces, respectively, of the Release Agents. Our method of evaluating the surface properties of Release Agents in two kinds of tests is shown to be effective.

  • Lifetime prolongation of Release Agent on antireflection structure molds by means of partial-filling ultraviolet nanoimprint lithography
    2015 International Conference on Electronic Packaging and iMAPS All Asia Conference (ICEP-IAAC), 2015
    Co-Authors: Nurhafizah Binti Abu Talip Yusof, Jun Taniguchi, Tatsuya Hayashi, Shin Hiwasa
    Abstract:

    Release Agent becomes an imperative element in ultraviolet nanoimprint lithography (UV-NIL) for preventing the adhesive resin from adhering to the surface of antireflection structures (ARS) mold. However, complete filling the resin of a high-aspect-ratio ARS mold during UV-NIL generates a strong Release force (RF) that deteriorates the Release Agent and shortens the lifetime of the ARS mold. In this paper, we proposed a technique of partial-filling UV-NIL in order to reduce the RF and consequently, prolong the lifetime of the Release Agent on ARS mold. The Release and optical properties of the ARS were measured to determine the lifetime of the Release Agent on the mold, and complete-filling UV-NIL was also executed for comparison. By means of partial-filling UV-NIL, we successfully fabricated ARS films with excellent performance up to 75th imprint compared to complete-filling UV-NIL up to the 40th imprint.

  • Measurements of flow distribution in a thin resin layer during ultraviolet nanoimprint lithography by means of digital holographic particle-tracking velocimetry
    Microelectronic Engineering, 2014
    Co-Authors: Noriyuki Unno, Shin Ichi Satake, Jun Taniguchi
    Abstract:

    There is an urgent need for micro- and nano-scale patterning methods with a high throughput and cost-effective process for the manufacture of devices of the next generation. Ultraviolet nanoimprint lithography (UV-NIL) represents a major breakthrough for next-generation lithography because of its higher resolution and greater simplicity compared with conventional technologies. However, transfer defects such as bubble defects or filling failures in the UV-NIL process have been problematic, because UV-NIL is a contact-type method. Therefore, it is important to elucidate the behavior of UV-curable resin flowing to permit control over defects in the duplicated pattern. In this study, we succeeded in measuring the flow distribution of a thin layer of UV-curable resin in situ during the press process of UV-NIL by means of microscale digital holographic particle-tracking velocimetry, and we clearly showed that a Release Agent coated onto the nanoimprint mold affects the resin flow. We believe that this study will help to provide a better understanding of the behavior of UV-NIL.

Christophe Baley - One of the best experts on this subject based on the ideXlab platform.

  • Improving the interfacial properties between flax fibres and PLLA by a water fibre treatment and drying cycle
    Industrial Crops and Products, 2012
    Co-Authors: Antoine Le Duigou, Eric Balnois, Alain Bourmaud, Peter Davies, Christophe Baley
    Abstract:

    This paper describes an analysis of the parameters that influence the adherence properties between flax fibres and PLLA. Microdroplet debonding tests have been used, together with Atomic Force and Scanning Electron Microscopy. The apparent interfacial shear strength of flax/PLLA is significantly higher than that of glass/PP and similar to that of glass/unsaturated polyester. Comparison of results for glass fibres and flax with and without Release Agent indicate a large contribution of thermal residual stresses to interface properties. The multi-layer nature of vegetal fibres affects debonding mechanisms and partial peeling of the fibre is noted. The cohesion of the fibre cell-wall must therefore also be considered.A water treatment of flax fibres (72. h at 23. °C) is shown to result in a small drop in tensile properties but a significant increase in interfacial shear strength and friction stress. Drying for 14. h at 105. °C reduces fibre Young's modulus and failure strength and also reduces fibre/matrix adhesion by 20%. More extensive fibre peeling is observed after drying, indicating that drying affects fibre wall cohesion. © 2012 Elsevier B.V.

Jin Huiliang - One of the best experts on this subject based on the ideXlab platform.

Keqiang Wang - One of the best experts on this subject based on the ideXlab platform.

  • halogen free flame proof unsaturated polyester molding compound
    2009
    Co-Authors: Wenjun Zhang, Kangjian Wang, Liyu Sun, Zhiying Xu, Wei Wei, Keqiang Wang
    Abstract:

    The invention relates to halogen-free flame retardant unsaturated polyester molding compound, which is made of the raw materials according to the part by weight: unsaturated polyester resin accounting for 18.2 parts to 20.5 parts; additive Agent accounting for 11.2 parts to 13.3 parts; initiating Agent accounting for 0.3 part to 0.55 part; polymerization inhibitor accounting for 0.003 part to 0.005 part; thickening Agent accounting for 0.1 part to 0.25 part; filling material accounting for 68 parts to 75 parts; phosphate accounting for 10.2 parts to 14.8 parts; metal oxide accounting for 2.7 parts to 4.6 parts; mould Release Agent accounting for 1.4 parts to 1.7 parts and reinforced fibers accounting for 15 parts to18 parts. The halogen-free flame retardant unsaturated polyester molding compound has the advantages that the flame retardant effect is good, the intensity is high, the shrinkage is low, the electrical property is excellent, and the halogen-free flame retardant unsaturated polyester molding compound is safe to human body and is environmental friendly due to the flame retardant and halogen-free properties and can be applied to switches, the casing bodies of daily electric appliances and other fabricated parts.