Preparation method of modified polyethylene diaphragm for lithium ion battery
A technology of polyethylene and diaphragm, which is applied in the direction of battery components, circuits, electrical components, etc., can solve the problems affecting the battery charge and discharge performance, the complexity of the preparation process of the diaphragm, and the impact on the porosity of the diaphragm, so as to promote interface bonding and molecular structure. Stabilizes and improves adhesive properties
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Embodiment 1
[0042]1. Synthesis of polyurethane adhesive
[0043] 1. Prepare the main agent and curing agent in the polyurethane adhesive
[0044] (1) Main agent
[0045] Formula (by weight percentage):
[0046] Polycarbonate diol (PCDL) 30%;
[0047] 1,4-cyclohexane diisocyanate (CHDI) 5.5%;
[0048] Hydroxy silicone oil (hydroxyl-terminated polydimethylsiloxane) 3%;
[0049] N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane 1.45%;
[0050] Dibutyltin dilaurate 0.05%;
[0051] Acetone 60%.
[0052] Preparation steps: Add polycarbonate diol in proportion to a four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser, and vacuum dehydrate at 120°C for 2 hours; adjust the temperature to 80°C, and add hydroxyl silicone oil, N- β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 1,4-cyclohexane diisocyanate, acetone solvent and dibutyltin dilaurate catalyst were reacted for 4 hours to obtain the main agent.
[0053] (2) curing agent
[0054] Formula (by weight percentage...
Embodiment 2
[0064] 1. Synthesis of polyurethane adhesive
[0065] 1. Prepare the main agent and curing agent in the polyurethane adhesive
[0066] (1) main ingredient formula (by weight percentage):
[0067] Polycarbonate diol (PCDL) 25%;
[0068] 1,4-cyclohexane diisocyanate (CHDI) 2.5%;
[0069] Hydroxy silicone oil (hydroxyl-terminated polydimethylsiloxane) 1.5%;
[0070] N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane 0.98%;
[0071] Dibutyltin dilaurate 0.02%;
[0072] Acetone 70%.
[0073] (2) Curing agent formula (by weight percentage):
[0074] 1,4-cyclohexane diisocyanate (CHDI) 40%;
[0075] Trimethylolpropane (TMP) 10%;
[0076] Ethyl acetate 50%.
[0077] The preparation method of main agent and curing agent is the same as embodiment 1. Mix the prepared main agent and curing agent uniformly at a weight ratio of 8.5:1, and stir at 80°C for 2 hours to prepare polyurethane adhesive PU-02.
[0078] 2. Preparation of modified polyethylene diaphragm
[0079] In the first ...
Embodiment 3
[0082] 1. Synthesis of polyurethane adhesive
[0083] 1. Prepare the main agent and curing agent in the polyurethane adhesive
[0084] (1) main ingredient formula (by weight percentage):
[0085] Polycarbonate diol (PCDL) 28.5%;
[0086] 1,4-cyclohexane diisocyanate (CHDI) 3.5%;
[0087] Hydroxy silicone oil (hydroxyl-terminated polydimethylsiloxane) 1.97%;
[0088] N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane 1%;
[0089] Dibutyltin dilaurate 0.03%;
[0090] Acetone 65%.
[0091] (2) Curing agent formula (by weight percentage):
[0092] 1,4-cyclohexane diisocyanate (CHDI) 45%;
[0093] Trimethylolpropane (TMP) 15%;
[0094] Ethyl acetate 40%.
[0095] The preparation method of main agent and curing agent is the same as embodiment 1. The prepared main agent and curing agent were uniformly mixed in a weight ratio of 9:1, and stirred at 80° C. for 2 hours to obtain polyurethane adhesive PU-03.
[0096] 2. Preparation of modified polyethylene diaphragm
[0097] In t...
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