Preparation method of polyimide
A polyimide and diamine technology, which is applied in the field of polyimide preparation, can solve the problems of difficult balance between expansion coefficient and mechanical strength, high cost of polyimide preparation, difficult processing and forming, etc., and achieve easy long-term Preservation, elimination of charge transfer complex) effect, effect of improving mechanical properties
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[0027] Example 1
[0028] Step 1. The dianhydride and diamine are polymerized in an ionic liquid according to a molar ratio of 1:1, wherein the ionic liquid is 1,3-bis(2-methoxy-2-oxyethyl) imidazole chloride and 1,3-bis(2-methoxy-2-oxoethyl)imidazolium hexafluorophosphate is prepared according to the molar ratio of 1:1, and the mass ratio of the total mass of diamine and dianhydride to the ionic liquid is 1~ 3. React at room temperature for 10 h to obtain a polyimide prepolymer solution.
[0029] Step 2: Mix the polyimide prepolymer solution with the water-soluble acrylic resin and saturated polyester resin solution with a molar ratio of 2:1, react at 80° C. for 1 h, cool, and add 20% of the total volume. After the organic solvent was refluxed for 2 hours, the organic solvent was evaporated, and the reflux was continued for 2 hours to obtain a polyimide premixed solution.
[0030] In step 3, the polyimide premix solution is mixed with deionized water to obtain a precipitate...
Example Embodiment
[0033] Example 2
[0034] Step 1. The dianhydride and diamine are polymerized in an ionic liquid according to a molar ratio of 1:1, wherein the ionic liquid is 1,3-bis(2-methoxy-2-oxyethyl) imidazole chloride and 1,3-bis(2-methoxy-2-oxyethyl) imidazole hexafluorophosphate is prepared according to the molar ratio of 1:1, and the mass ratio of the total mass of diamine and dianhydride to the ionic liquid is 1: 5. React at room temperature for 15 hours to obtain a polyimide prepolymer solution.
[0035] Step 2: Mix the polyimide prepolymer solution with the water-soluble acrylic resin and saturated polyester resin solution with a molar ratio of 2:1, react at 100 ° C for 1 h, cool, and add 30% of the total volume. After the organic solvent is refluxed for 5 hours, the organic solvent is evaporated, and the reflux is continued for 5 hours to obtain a polyimide premixed solution.
[0036] Step 3: Mix the polyimide premix solution with deionized water to obtain a precipitate, and f...
Example Embodiment
[0039] Example 3
[0040]Step 1. The dianhydride and diamine are polymerized in an ionic liquid according to a molar ratio of 1:1, wherein the ionic liquid is 1,3-bis(2-methoxy-2-oxyethyl) imidazole chloride and 1,3-bis(2-methoxy-2-oxoethyl)imidazolium hexafluorophosphate is prepared according to the molar ratio of 1:1, and the mass ratio of the total mass of diamine and dianhydride to the ionic liquid is 1~ 10. React at room temperature for 20 hours to obtain a polyimide prepolymer solution.
[0041] Step 2: Mix the polyimide prepolymer solution with the water-soluble acrylic resin and saturated polyester resin solution with a molar ratio of 2:1, react at 120 ° C for 2 hours, cool, and add 35% of the total volume. After the organic solvent is refluxed for 10 hours, the organic solvent is evaporated, and the reflux is continued for 10 hours to obtain a polyimide premixed solution.
[0042] In step 3, the polyimide premix solution is mixed with deionized water to obtain a pre...
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