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    Home > Coatings News > Resin News > Study on High Temperature Resistant and Thickening Epoxy Vinyl Ester Resin

    Study on High Temperature Resistant and Thickening Epoxy Vinyl Ester Resin

    • Last Update: 2020-12-02
    • Source: Internet
    • Author: User
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    Abstract
    :
    this
    to the
    properties of
    high temperature-resistant thickenable vinyl epoxy
    resin
    ,
    and resin
    thickening properties and
    SMC
    products performance
    and similar high temperature can thicken ethylene epoxy resin, inter-benzene glycol unsaturated polyester resin and other products for performance comparison and analysis. Experiments show that the performance of high temperature-resistant thickenable epoxy vinyl ester resin
    SMC
    products is significantly better than that of inter-benzene glycol unsaturated polyester resin
    SMC
    products, and the performance of
    all
    has reached the performance level of similar high-temperature thickenable ethylene oxide resin products abroad. At the same time, this paper also for the development of high temperature thickening vinyl epoxy resin industrial application has accumulated a large number of engineering practical experience
    China
    . Therefore, it is of great guiding significance for the engineering application of high temperature thickening ethylene epoxy resin.
    key words:
    vinyl epoxy resin; high temperature resistance; thickening
    ;
    SMC/BMC
    0
    Introduction
    Ethylene epoxy resin is made by epoxy resin and methyl acrylic, etc. through open ring addition reaction. Its molecular structure not only retains the basic chain segment of epoxy resin, but also has the good process performance of unsaturated polyester resin, after curing under suitable conditions, can show some special excellent performance, as a new high-performance polymer material
    ,
    more and more people's attention.
    1
    especially in Europe and the United States, through vinyl epoxy resin in the application of molding process requirements for structural design has been very mature, ethylene epoxy vinyl resin is widely used in automotive molding structural parts and other fields.

    molding (
    compression molding
    ) process, using sheet mold plastic
    (
    Heet Molding Compound, SMC)
    or group mold plastic (
    Bulk molding compound
    ,
    BMC
    )
    materials, is currently a composite material technology at home and abroad an important mechanical molding method, its products with high precision, good appearance, product performance and other characteristics, suitable for the production of complex structure, size and specification stability requirements of high products, while the process can meet different application conditions of products or products of large-scale production, easy to achieve the entire production process mechanization, automation. At present, its application field has been expanded from the initial automotive industry to other industries,
    SMC/BMC
    materials and their products in developed countries accounted for
    35-40%
    of composite materials production, therefore,
    SMC/BMC
    and its products manufacturing technology is an important symbol of the development of national composites
    technology level
    With the improvement of environmental protection requirements, the
    SMC/BMC
    technology, which has the advantages of clean production compared to hand paste and extrusion, can bring considerable economic benefits not only to the composite industry, but also to great social benefits.
    China since the
    60s
    began to develop
    SMC/ BMC
    technology, after more than
    50
    years, the development of resin substrate is no longer a single common unsaturated resin (
    UPR
    ), ordinary bisphenol
    A
    epoxy ethylene resin in recent years began to apply and mature. However, high-performance high-temperature thickening ethylene epoxy resin in the field of technology still needs to be breakthrough.
    1
    high temperature can thicken ethylene epoxy resin synthesis
    using phenolic epoxy resin as raw material synthetic molecular skeleton contains
    NOVOLAC
    type ethylene epoxy ethylene resin. This epoxy resin has good corrosion resistance, solvent resistance and high temperature resistance.

    1.1
    The raw material for the synthesis of high temperature-resistant thickenable vinyl epoxy ethylene ester resin
    the main raw material for the synthesis of high temperature-resistant thickenable ethylene epoxy vinyl ester resin, see Table
    1.1
    .
    table
    1.1
    Synthetic high temperature thickenable ethylene epoxy resin raw material list
    name
    specification parameters
    Note
    phenolic epoxy resin
    epoxy equivalent
    178 g/eq.
    , Industrial Grade
    Dow Chemical Co., Ltd.
    Replication Catalyst
    Homemade, Industrial Grade
    Shanghai Fuchen Chemical Co., Ltd.
    methyl acrylic
    Purity
    ≥ 99%
    , industrial grade
    LG
    chemical
    styrene
    industrial grade
    Mitsui chemical
    blocker
    methyl hydroquinone
    THQ

    , the
    -grade
    Abao, United States
    shunbutene deacide
    intrain-grade
    Sinopec
    methyl peroxide ethyl ketone
    reactive oxygen content
    10%
    , Industrial-grade
    AkzoNobel
    cobal cobalt
    propanobalic acid
    0.8%
    , industrial-grade Jiangyin forward
    Magnesium oxide
    industrial products
    Origin Shandong

    1.2
    synthetic process
    put phenolic epoxy resin into the reactor, and when the temperature warms up to
    1
    10
    degrees C
    slowly dripping dissolves the catalyst and the blocker, respectively. Methyl acrylic solution
    ,
    2
    hours
    drops added, to be re-reacted
    3
    to
    6
    h
    after adding shunbutylate , continue
    the
    reaction
    15 degrees
    degrees C

    0.5
    to
    2
    h
    , when the reaction acid value is
    3
    0

    4
    mgKOH/g
    mgKOH/g
    the end of the reaction. Then cool down, the temperature to
    95
    degrees C
    hours
    add styrene, mixed to thicken the phenolic ethylene oxide resin (followed by 893N
    ).
    1.3
    the main raw material for the preparation of
    SMCthe main raw material for the preparation of high temperature-resistant thickenable vinyl epoxy ethylene resin
    SMC
    materials, see Table
    1.3

    table
    1.3
    high temperature thickenable vinyl epoxy resin
    SMC
    material preparation formula
    ingredients
    formula one (parts, weight)
    formula two (parts) Weight)
    resin (
    893N
    )
    70
    70
    low shrink agent
    (
    PS
    /
    HDPE

    )
    30
    30
    blender (
    TBPO/TBPB
    )
    1
    1
    release agent (zinc statide)
    4
    4
    fillers
    (
    calcium carbonate
    , etc.
    )
    140
    140
    thickener (magnesium oxide paste)

    2.86
    5.7
    1.4
    SMC
    preparation process
    according to table
    1
    .3
    ratio weighing good resin (
    893N
    ), low shrinkage agent, mixture trigger, release agent, etc., and then stir thoroughly to mix well, pay attention to the filling at the same time, after filling is added, stir for about
    10
    minutes until the filler disperses Evenly, then add a well-weighed paste
    MgO
    , stir and mix well and pour into the upper and lower grooves of the
    SMC
    sheet manufacturing equipment, start the equipment, and finally make
    SMC
    sheet. The resulting
    SMC
    sheet is cooked at
    40±2
    degrees C
    40h
    , you can get the required sheet mold plastic, glass fiber content of about
    29%
    (mass fraction).
    1.5
    test equipment
    synthesized high temperature thickenable vinyl epoxy resin, prepared
    SMC
    sheet and its products performance parameters test instrument
    ,
    equipment and testing standards see Table
    1.5
    .
    Table
    1.5 893N
    Resin Synthesis and Preparation
    SMC
    Performance Parameters Test Instruments and Equipment List
    Table
    Test Project
    Test Instruments and Equipment
    Test standard
    resin viscosity
    NDJ-1E
    rotary viscosity meter
    GB/T 7193-2008
    thickening resin paste thickening performance
    U.S.
    koehler
    cone-intricator
    -measured taper-in
    (25
    degrees C
    ,
    50g
    piston
    )
    acid
    titration instrument
    GB/T 2895-2008
    gel time
    Gelprof 518
    tree
    lipid gel tester
    GB/T 7193-2008
    Mechanical Performance
    Zwick Allround
    Electronic All-Power Tester
    GB/T1447-2005
    ,
    GB/T144 9-2005
    thermal deformation temperature
    U.S.
    MTS Z
    WK1000
    thermal deformation Vika softening point tester
    GB/T634.1-1

    2004
    TG209F3
    thermal weight analyzer
    -2
    high temperature thickening vinyl epoxy resin thickening properties With performance
    2.1
    synthesis and properties
    high temperature thickening ethylene epoxy resin
    should
    has the following characteristics:
    (1)
    and for thickening of the reinforced material, Fillers can be well immersed,
    (2)
    initial viscosity is moderate and can be quickly thickened,
    (3)
    still has good resynamic properties at high temperatures, including fatigue resistance and toughness,
    (4)
    storage cycle is long,
    (5)
    solidified heating peak and styrene waveworthiness is low. In order to achieve a good thickening effect, in the synthesis of substrate resin research, the usual method is: the introduction of vinyl molecules of carboxyl (acidic erythroid group), and then through these nircotine and alkaline metal oxides (such as magnesium oxide, calcium oxide, etc.) to achieve thickening. The principle is as follows: :Therefore, the reaction degree and thickening performance of the acid anhydride are closely related, which needs to be guaranteed by the preferred catalyst and reaction parameter control.
    SMC
    consistency is good or bad by the size of taper in, the smaller the taper in, its thickening performance is better. High temperature thickenable ethylene epoxy resin
    (893N)
    in accordance with the aforementioned
    SMC
    formulation and process prepared resin paste at
    40
    degrees C
    the environment around the time, respectively, after
    17h
    ,
    36h
    ,
    48h
    matured and cooled to room temperature under the conditions of the tree
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