Rantai molekul polisosianat ngemot gugus isocyano (-NCO) lan gugus urethane (-NH-COO-), mulapoliuretanadesif nampilake aktivitas lan polaritas sing luwih dhuwur. Iki nduweni adhesi kimia sing apik banget karo substrat sing ngemot hidrogen aktif, kayata busa, plastik, kayu, kulit, kain, kertas, keramik lan bahan keropos liyane, uga logam, kaca, karet, plastik lan bahan liyane sing ana ing permukaan sing alus. Preduli saka poliuretanadesif, isosianat ditanggepi sacara kimia lan ditambani.
Poliuretanperekat duwe kekuatan geser lan resistensi pengaruh sing apik, cocog kanggo macem-macem bidang ikatan struktural, lan nduweni sifat keluwesan sing apik.
1. Universal komponen loropoliuretanadesif
The universal two-component poliuretan adhesive is made of polyethylene adipate as the raw material, solvent poliuretan resin as the main component (component A), and trimethylolpropane—T1) adduct as the curing agent (B Component) two-component poliuretan adhesive. The universal two-component poliuretan adhesive, also known as 101-poliuretan adhesive, is the first poliuretan adhesive that was put into industrial production in Shanghai Xinguang Chemical Plant and is still the largest domestic production volume. There are more than 1,000 domestic users. It is mainly used for insulation materials, packaging materials, Bonding of composite membranes, porous materials, cryogenic protection materials, etc.Kaloro komponenpoliuretanadesif duwe ciri kaya ing ngisor iki:
(1) Sawise rong komponen dicampur, adesif reaktif bakal ngalami reaksi lintas-link kanggo ngasilake produk sing bisa diobati.
(2) Sajrone nyiapake, komposisi bahan baku lan bobot molekul saka rong komponen kasebut bisa diatur supaya viskositas cocog ing suhu ruangan, lan bisa digawe kontes padhet dhuwur utawa adhesif komponen rong pelarut.
(3) Biasane bisa diobati kanthi suhu ruangan, lan kecepatan ngobati bisa dikurangi kanthi milih bahan baku kanggo nyiyapake adesif utawa nambah katalis. Umume, rong komponenpoliuretanperekat duwe adhesi awal sing luwih gedhe, sing diarani ngobati pemanasan, lan kekuatan perekat pungkasane luwih gedhe tinimbang karo adhesif komponen siji, sing bisa nyukupi persyaratane perekat struktural.
(4) Dosis saka rong komponen kasebut bisa diatur sajrone kisaran tartamtu, lan umume ana toleransi tartamtu. Rasio molar NCO / OH saka rong komponen umume luwih gedhe saka utawa padha karo 1. Nalika ngobati, bagean saka klompok NCO melu reaksi obat lem kanggo ngasilake adhesi kimia. Kelompok NCO sing luwih gedhe uga bisa diobati kanthi dadi panas. Gawe allophanate, biuret, lan liya-liyane, tambahake tingkat crosslinking, lan tingkatake kekuatan kohesif lan tahan panas lapisan adesif. Kanggo komponen loro sing bebas pelarutpoliuretanadesif, amarga bobot molekul awal kanggo saben komponen ora gedhe, umume rasio molar NCO / OH padha karo utawa luwih gedhe tinimbang 1, sing kondusif kanggo ngrampungake ngrampungake, utamane nalika ikatan segel, menehi perhatian marang NCO. dadi gedhe banget. Kanggo perekat rong komponen adhedhasar pelarut, bobot molekul agen utama luwih gedhe, lan kinerja adhesi awal luwih apik. Jumlah rong komponen kasebut bisa diatur kanthi sawetara sing luwih gedhe, lan rasio molar NCO / OH bisa kurang saka 1 utawa luwih saka 1. Times. Nalika komponen NCO (agen ngobati) gedhe banget, polimosianat nggawe polimerisasi kanggo nggawe lapisan adhesif sing angel, sing cocog kanggo ikatan bahan hard; nalika jumlah komponen NCO sithik, lapisan adesif alus lan bisa digunakake Ikatan bahan alus kayata kulit lan kain.
Wiwit anane rong komponenpoliuretanperekat, wis dadi produk kanthi macem-macem lan output paling gedhe ingpoliuretanadesif amarga bisa nyetel kinerja, kekuatan ikatan sing dhuwur, lan kisaran ikatan sing jembar.General purpose two-component poliuretan adhesive
Komponen loro tujuan umumpoliuretanadesif can be used to bond metals (such as aluminum, iron, steel, etc.), non-metals (such as ceramics, wood, leather, plastics, etc.) and bonding between different materials. General-purpose two-component poliuretanadesif are widely used in the manufacture of insulating paper (polyester film-blue shell paper composite), paper-plastic composite (color printing paper-polypropylene film), iron plate-poliuretan foam composite and bristle brushes used in motors. The manufacturing and other uses penetrate into various fields of the national economy.
(1) Pangopènan ril alat mesin
Adopsi metode piring plastik sing dipasang lan diikat kanggo nemplekake piring plastik tipis ing rel pandhuan wesi kanggo nggawe rel pandhuan plastik, sing bisa ngatasi lintasan pandhuan alat mesin. Gunakake jangkar wesi-10lpoliuretanlem, nyiyapake cairan lem miturut komponen A: komponen B = 100: 50 (bagean massa), aduk cairan lem kabel tembaga tipis kanthi diameter 0,1mm lan dawane 20mm kanggo nggawe cukup ruangan ing antarane pandhuan ril lan piring plastik kanggo nyegah kabeh lem ora bisa remet. Lumahing ikatan loro ing piring plastik lan rel besi cor kudu ditutupi lem kaping pindho. Kapisan 5 menit banjur kaping pindho. Sawise 15-20 menit, lapisan lem lengket lan ana fenomena nggambar kawat, banjur plastik Plat lan rel pandhuan ditumpukake lan ditekan kanthi bobote dhewe. Amarga prabédan suhu sing gedhe antara musim salju lan musim panas, plastik bakal ngambak utawa kontrak, nyebabake stres internal lan retak. Mula, suhu pangobatan kudu disimpen antara 20-25 ° C. Wektu ngobati yaiku 1-2 dina.
(2) Ikatan saka pamicara
Sistem getaran speker, yaiku kothak kertas, koil swara lan braket posisi, kudu ditempelake bebarengan. Apamaneh nalika speker daya dhuwur kedher, amplitudo gedhe, mula kudu diikat kanthi kuat, amarga ana gandhengane langsung karo umur pengeras suara. Utamane speker ndhuwur 100mm terpakupoliuretanadesif Nganggo jangkar wesi-101 poliuretan adesif miturut komponen A: komponen B = 100: 30-35 (bagean massa), lan efek sing diarepake bisa ditindakake sawise digunakake. Kanggo ikatan koil swara speaker, lem disiapake karo komponen A: komponen B = 100: 25 (bagian massa).
(3) Aplikasi ing produk sikat rambut
Komponen loro tujuan umumpoliuretan adhesive is an ideal adhesive for bristles. The bonding of the bristle brush is to bond the bristles (bristles or nylon bristles, etc.), wood chips (wood) and brush shells (tinplate). The surface is required to be closed by 1-2mm, and it is required to penetrate 6-9mm. Commonly used glue formulations are: 100 parts of component A, 35 parts of component B, and 30 parts of talc (≥160 mesh). Pour the prepared adhesive into the brush shell or use a bristle brush glue filling machine for potting. After potting, shake the brush head to make the adhesive even, and place it until it has dried (turned into the hair for no less than 24h). The adhesive strength of the brush bristles after potting with the adhesive is greater than 130N, which meets the SG236-8l bristles paint brush standard (98N). If the bristles do not come off or loose after being soaked in acetone for 24 hours, the glue meets the requirements.
2. Kinerja sakapoliuretankanggo sepatu
Poliuretanperekat kanggo sepatu, kayadene liyanepoliuretanperekat, duwe kinerja suhu sithik banget, suhu curing sithik, keluwesan sing apik, resistensi pengaruh, kemampuan mbukak lan adhesi kanggo akeh bahan. Mula, asring digunakake ing acara sing mbutuhake suhu ruangan, ngobati cepet lan keluwesan, lan cocog kanggo ikatan bahan sing ora beda karo koefisien ekspansi sing beda. Syarat kinerja perekat gawe sepatu beda-beda karo bahan sepatu, bentuk sepatu lan proses ikatan, nanging umume, perekat sepatu kudu nduweni sifat kaya ing ngisor iki:
(1) Kasedhiya kekuwatan ikatan sing cukup kanggo bahan sing ora padha lan macem-macem bahan kristal, lan kekuwatan kupas dhuwur;
(2) Adhesi awal iku dhuwur, sing cocog karo syarat lini produksi sepatu; utamane kekuwatan kupasan iku dhuwur;
(3) Proses ukuran gampang, gampang dioperasikake, lan umur layanan bisa diatur kanggo nyukupi kebutuhan garis produksi sepatu; (4) tahan panas moderat, tahan banyu cukup lan daya tahan ikatan.Poliuretanadesif kanggo sepatu bisa nyukupi persyaratan ing ndhuwur, lan kinerja adhesi awal luwih elek tinimbang adhesive neoprene. Nanging, saiki, peneliti ing njero omah lan luar negeri wis ngusulake metode kanggo nambah adhesi awal, sing wis dirampungake.
3. Waterborne poliuretanadesif
Waterborne poliuretanadesif have the characteristics of low VOC content, low or no environmental pollution, non-combustibility, etc., which is the key development direction of poliuretanadesif. The diversity of poliuretanadesif has prepared solutions for many bonding problems, and is especially suitable for places where other types ofadesif cannot be bonded or where bonding is difficult.Kajaba iku,poliuretanadesif also have the characteristics of adjustable toughness, simple bonding process, excellent low temperature resistance and excellent stability. It is precisely because of the excellent adhesion performance and adaptability of poliuretanadesif to a variety of substrates that its application fields have been continuously expanded, and it has become the fastest growing adhesive at home and abroad in recent years.
Migunakake sakapoliuretanadesif
Poliuretan adhesive is an important part of the poliuretan resin that is currently developing rapidly. It has excellent properties and has been widely used in many aspects. It is one of the eight important types of syntheticadesif.
Poliuretanadesif have excellent shear strength and impact resistance, are suitable for various structural bonding fields, and have excellent flexibility properties. Poliuretan adhesive has excellent rubber properties and can adapt to the adhesion of substrates with different thermal expansion coefficients. It forms a soft-hard transition layer between the substrates, which not only has strong adhesion, but also has excellent cushioning and shock absorption. Function. The low and ultra-low temperature properties of poliuretanadesif exceed all other types ofadesif. The diversity of poliuretanadesif has prepared solutions for many bonding problems, and is especially suitable for places where other types ofadesif cannot be bonded or where bonding is difficult.
