One-step preparation method and product of polyimide open-cell foam

Abstract

The invention discloses a method and product for preparing polyimide open-cell foam by one-step method. The preparation method includes the following steps: Step 1: dissolving the corresponding mass of organic acid auxiliary agent in the polar solvent of diacid diester in proportion In the solution, stir evenly to obtain foaming slurry A; step 2: mix the catalyst, foam stabilizer and foaming agent in proportion to obtain foaming slurry B; step 3: weigh the corresponding mass of polyisocyanate as the foaming slurry Slurry C; and keep foaming slurry C at the same temperature as foaming slurry A and foaming slurry B; step 4: mix foaming slurry A, foaming slurry B and foaming slurry C , to obtain a polyimide foam intermediate; Step 5: demoulding the polyimide foam intermediate, and placing it in a blast drying oven, and then raising the temperature of the blast drying oven to 170-200°C to obtain a polyimide foam intermediate. Amine open cell foam. The invention has the characteristics of effectively improving the sound absorption performance, simplifying the production process and reducing the production cost.

Description

technical field

[0001] The invention relates to a polyimide foam material and a preparation method thereof, in particular to a method and a product for preparing polyimide open-cell foam in one step. Background technique

[0002] The performance of a foam depends largely on its pore structure. For example, the open-pore structure has complex internal channels and high specific surface area, which are often used for catalysis and absorption. Closed-cell foam contains a large amount of gas inside and is often used for impact resistance and heat transfer resistance. In the field of sound absorption, porous foam materials have been widely used, among which open-cell foam materials occupy a dominant position. Due to its high porosity and interpenetration between pores, the incident sound wave can easily and effectively enter the deep layer of the foam, weakening the surface reflection, and generally has better sound absorption performance at medium and high frequencies. Melami...

Examples

Embodiment 1

[0025] Example 1. The method for preparing polyimide open-cell foam by one-step method comprises the following steps:

[0026] Step 1: Proportionally dissolving the corresponding mass of organic acid additives in the polar solvent solution of diacid diester, stirring evenly to obtain foaming slurry A;

[0027] Step 2: mixing the catalyst, foam stabilizer and foaming agent uniformly in proportion to obtain foaming slurry B;

[0028] Step 3: Weighing polyisocyanate of corresponding quality as foaming slurry C; and keeping foaming slurry C at the same temperature as foaming slurry A and foaming slurry B;

[0029] Step 4: Mix foaming slurry A, foaming slurry B and foaming slurry C, stir with a high-speed agitator for 5 to 30 seconds, and then pour into a mold for foaming to obtain a polyimide foam intermediate;

[0030] Step 5: Demould the polyimide foam intermediate and place it in a blast drying oven heated to 90-120°C in advance, and then raise the temperature of the blast dr...

Embodiment 2

[0040] Example 2. In a disposable plastic cup, dissolve 10g of oxalic acid in 40g of N,N-dimethylformamide solution of dimethyl 3,3',4,4'-benzophenone tetraate, stir evenly to obtain foam Slurry A: In a disposable plastic cup, add 3.2g of a catalyst prepared by T12, Dabco33, and triethanolamine in a mass ratio of 1:2:5, and 10g of a catalyst prepared by AK8805 and PEG600 in a mass ratio of 1:1 The formed foam stabilizer and 4.8g deionized water were mixed evenly to obtain foaming slurry B; 60g of polyisocyanate weighed was added in a disposable plastic cup as foaming slurry C; Foam slurry A, foam slurry B and foam slurry C are mixed, stirred with a high-speed mixer for 10s, poured into a mold for foam molding to obtain a polyimide foam intermediate; remove the polyimide foam intermediate The mold is placed in a blast drying oven that has been heated up to 100°C in advance, and then the blast drying oven is heated to 180°C at a rate of 5°C / min to complete the transformation fr...

Embodiment 3

[0042] Example 3. In a disposable plastic cup, dissolve 11g of oxalic acid in 44g of N,N-dimethylacetamide solution of diethyl 3,3',4,4'-biphenyltetraate, stir evenly to obtain a foaming slurry A; In a disposable plastic cup, sequentially add 4g of a catalyst prepared by T12, Dabco33, and triethanolamine in a mass ratio of about 0.7:2:5, and 10g of a catalyst prepared by AK8805 and PEG600 in a mass ratio of 1:1 The foam stabilizer and 5.0g deionized water were mixed evenly to obtain foaming slurry B; 60g of polyisocyanate was weighed and added to a disposable plastic cup as foaming slurry C; the foaming material at about 20°C Slurry A, foaming slurry B and foaming slurry C are mixed, stirred with a high-speed mixer for 8-10s, and poured into a mold for foaming to obtain a polyimide foam intermediate; the foam intermediate is demoulded and placed in a pre- Raise the temperature to 100°C in a blast drying oven, then raise the temperature of the blast drying oven to 180°C at a r...

technical field

[0001] The invention relates to a polyimide foam material and a preparation method thereof, in particular to a method and a product for preparing polyimide open-cell foam in one step. Background technique

[0002] The performance of a foam depends largely on its pore structure. For example, the open-pore structure has complex internal channels and high specific surface area, which are often used for catalysis and absorption. Closed-cell foam contains a large amount of gas inside and is often used for impact resistance and heat transfer resistance. In the field of sound absorption, porous foam materials have been widely used, among which open-cell foam materials occupy a dominant position. Due to its high porosity and interpenetration between pores, the incident sound wave can easily and effectively enter the deep layer of the foam, weakening the surface reflection, and generally has better sound absorption performance at medium and high frequencies. Melami...

Examples

Embodiment 1

[0025] Example 1. The method for preparing polyimide open-cell foam by one-step method comprises the following steps:

[0026] Step 1: Proportionally dissolving the corresponding mass of organic acid additives in the polar solvent solution of diacid diester, stirring evenly to obtain foaming slurry A;

[0027] Step 2: mixing the catalyst, foam stabilizer and foaming agent uniformly in proportion to obtain foaming slurry B;

[0028] Step 3: Weighing polyisocyanate of corresponding quality as foaming slurry C; and keeping foaming slurry C at the same temperature as foaming slurry A and foaming slurry B;

[0029] Step 4: Mix foaming slurry A, foaming slurry B and foaming slurry C, stir with a high-speed agitator for 5 to 30 seconds, and then pour into a mold for foaming to obtain a polyimide foam intermediate;

[0030] Step 5: Demould the polyimide foam intermediate and place it in a blast drying oven heated to 90-120°C in advance, and then raise the temperature of the blast dr...

Embodiment 2

[0040] Example 2. In a disposable plastic cup, dissolve 10g of oxalic acid in 40g of N,N-dimethylformamide solution of dimethyl 3,3',4,4'-benzophenone tetraate, stir evenly to obtain foam Slurry A: In a disposable plastic cup, add 3.2g of a catalyst prepared by T12, Dabco33, and triethanolamine in a mass ratio of 1:2:5, and 10g of a catalyst prepared by AK8805 and PEG600 in a mass ratio of 1:1 The formed foam stabilizer and 4.8g deionized water were mixed evenly to obtain foaming slurry B; 60g of polyisocyanate weighed was added in a disposable plastic cup as foaming slurry C; Foam slurry A, foam slurry B and foam slurry C are mixed, stirred with a high-speed mixer for 10s, poured into a mold for foam molding to obtain a polyimide foam intermediate; remove the polyimide foam intermediate The mold is placed in a blast drying oven that has been heated up to 100°C in advance, and then the blast drying oven is heated to 180°C at a rate of 5°C / min to complete the transformation fr...

Embodiment 3

[0042] Example 3. In a disposable plastic cup, dissolve 11g of oxalic acid in 44g of N,N-dimethylacetamide solution of diethyl 3,3',4,4'-biphenyltetraate, stir evenly to obtain a foaming slurry A; In a disposable plastic cup, sequentially add 4g of a catalyst prepared by T12, Dabco33, and triethanolamine in a mass ratio of about 0.7:2:5, and 10g of a catalyst prepared by AK8805 and PEG600 in a mass ratio of 1:1 The foam stabilizer and 5.0g deionized water were mixed evenly to obtain foaming slurry B; 60g of polyisocyanate was weighed and added to a disposable plastic cup as foaming slurry C; the foaming material at about 20°C Slurry A, foaming slurry B and foaming slurry C are mixed, stirred with a high-speed mixer for 8-10s, and poured into a mold for foaming to obtain a polyimide foam intermediate; the foam intermediate is demoulded and placed in a pre- Raise the temperature to 100°C in a blast drying oven, then raise the temperature of the blast drying oven to 180°C at a r...

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