WO2018036013A1 - Polyester-type reticulated polyurethane soft foamed plastic and preparation method therefor - Google Patents

Abstract

Disclosed are a polyester-type reticulated polyurethane soft foamed plastic and a preparation method therefor. A polyurethane soft foamed plastic is produced by using at least one polyester polyol as a raw material, mixing, foaming and polymerizing same with an isocyanate component under the action of a catalyst, a foaming agent and a foam stabilizing agent, and same is subjected to a reticulated treatment so as to prepare a reticulated foam with an open porosity of 99% or more. In the present invention, the special properties, such as being oil-resistant, water-resistant, abrasion-resistant, corrosion-resistant, high-temperature-resistant, and strong in stretchability, and more importantly, the characteristics, such as a uniform foam hole and a good glossiness, of a polyester sponge are used; and by performing a reticulated treatment on the polyester sponge, a reticulated foam having uniform open holes and a smooth foam hole network is obtained. A high-temperature-resistant porous reticulated ceramic fired from the reticulated foam can be used as a filtering material in the metallurgy industry. Compared with other products, the durability and the economic efficiency thereof further have an incomparable advantage.

Description

 Description: Inventive name: polyester mesh polyurethane flexible foam and preparation method thereof

 [0001] The present invention relates to a polyester type mesh polyurethane flexible foam and a preparation method thereof.

 Background technique

 [0002] Polyether sponge is formed by polymerizing and foaming polyether and isocyanate under various additives. Based on the polarity of polyether, it can form a very stable lubricant film with high adsorption and load carrying capacity under almost all lubrication conditions, with low friction coefficient and strong shear resistance. And its biggest feature is that it can be easily split. In addition to the properties of the polyether sponge, the polyester sponge also has special properties such as oil resistance, water resistance, abrasion resistance, corrosion resistance, high temperature resistance and strong stretchability, and the product has uniform cells and good gloss, and is viscous with the fabric. Strong knot rate and other characteristics. Therefore, polyester sponges are widely used in more advanced vehicle interiors, air conditioner filters, train oil pillows, aircraft fuel tank fillers and the like.

 [0003] Reticulated polyurethane foam is a high-porosity flexible polyurethane foam with special functions, which has a high porosity; its softness, gas permeability, sound absorption, mechanical strength, etc. are better than ordinary polyurethane. Good foam, good filtration and processing properties. Due to its low density and porous foam structure, the wall shell has a three-dimensional skeleton structure, and thus has been widely used in filter materials and filling materials.

 [0004] Reticulated foam as a filter material has the advantages of large voids in the foam, low resistance to the medium, easy washing, and the foam can be repeatedly used, and is suitable for use in various air purifying equipments; as a tank filling medium, It is also widely used in tanks and reticulated foams for a wide range of flammable fluid storage tanks; reticulated foams can also be used for sound insulation materials, material carriers, etc.

[0005] In addition, it can also be used as a molding skeleton for ceramics, and has a wide range of uses. The high temperature resistant porous mesh ceramics fired by reticulated foam can be used as a filter material in the metallurgical industry. Its durability and economy are unparalleled advantages of other products. At present, many companies at home and abroad are The pupil is sponge, but the pupil ratio is not more than 99%, which has a certain impact on the performance of the product. To achieve better results, more pupil sponges are needed to solve the problem. At the same time, since some defects of the polyether sponge cannot be used in the ceramic molding skeleton, only the polyester sponge having uniform cell and stronger toughness is selected. technical problem [0006] An object of the present invention is to provide a polyester mesh flexible polyurethane foam having uniform cells and a smooth cell network and a preparation method thereof.

 Problem solution

 Technical solution

 [0007] A polyester type reticulated flexible polyurethane foam characterized by: mixing foaming with at least one polyester polyol as a raw material and an isocyanate component and a catalyst, a foaming agent, and a foam stabilizer Polymerized polyurethane foam, which is obtained by reticulating and has a meshing foam with a pupil ratio of 99% or more.

[0008] A method for preparing a polyester mesh flexible polyurethane foam, characterized in that: mixing at least one polyester polyol as a raw material with an isocyanate component and a catalyst, a foaming agent, and a foam stabilizer The foaming polymerization produces a polyurethane flexible foam and is reticulated.

 [0009] The preparation method of the polyester mesh flexible polyurethane foam comprises the following steps: (1) pressing a polyester polyol, a catalyst, a foaming agent, a foam stabilizer and an isocyanate component through a metering pump The fixed proportion is sent to the foaming machine head, and after high-speed stirring, it is evenly distributed on the kraft paper of the continuous foaming production line; (2) It is matured in the process of conveying in the continuous foaming production line, and is solidified to obtain polyurethane flexible foam, and then online. Cut into the specified size; (3) Reticulate the cut polyurethane soft foam.

 [0010] The polyester polyol is a phthalic anhydride polyester polyol, wherein the average functionality is 2-3, the hydroxyl value is 10-200 m gKOH/g, the preferred functionality is 2.0-2.5, and the hydroxyl value is 50-150 mgKOH/ Between g; the isocyanate component is one or more of toluene diisocyanate, diphenylmethane diisocyanate or polyphenyl polyisocyanate; the mass ratio of polyester polyol to isocyanate component is 100: 40 -60.

[0011] The catalyst is an amine and/or metal salt catalyst; the blowing agent is a physical and/or chemical blowing agent, respectively.

[0012] The amine catalyst in the amine and / or metal salt catalyst is a tertiary amine catalyst, which is pentamethyldiethylenetriamine, hydrazine, hydrazine-dimethylcyclohexylamine, triethylenediamine, At least one of triethylamine and didimethylaminoethyl ether; the metal salt catalyst is potassium isooctoate, quaternary ammonium formate, potassium acetate, dibutyltin dilaurate, stannous octoate and potassium oleate At least one of them.

[0013] The physical foaming agent is water; the chemical foaming agent is 1,1-dichloro-1-fluoroethane (HCFC-141B), 1,1, 1,3,3-five At least one of fluoropropane (HFC-245fa) and 1,1,1,3,3-pentafluorobutane (HFC-365) One.

 [0014] The reticulation treatment method is an alkali immersion method, an explosion method, a steam hydrolysis method or a hot air method.

[0015] The explosion method is to detonate by using a plurality of explosive gas mixtures to reach the required explosion limit, and to break the membrane wall by using instantaneous explosive energy and high-temperature flame, thereby causing the polyurethane foam cell membrane wall to melt and adhere to the foam meridian, thereby To achieve the purpose of networking. The specific method is to put the cut polyurethane soft foam into the blasting box, and according to the external temperature, fill the corresponding proportion of the gas required to reach the gas explosion equilibrium point and then detonate to obtain the pupil sponge reticular foam. The gas is acetylene, oxygen or nitrogen.

 Advantageous effects of the invention

 Beneficial effect

 [0016] The invention utilizes the polyester sponge to have special properties such as oil resistance, water resistance, wear resistance, corrosion resistance, high temperature resistance, strong stretchability, and more importantly, the characteristics of uniform cells and good luster, and meshing thereof. Treatment, the obtained mesh foam with uniform pupil and smooth cell network. The high-temperature porous ceramics fired by the reticulated foam can be used as a filter material in the metallurgical industry, and its durability and economy are unmatched advantages of other products.

 BEST MODE FOR CARRYING OUT THE INVENTION

 BEST MODE FOR CARRYING OUT THE INVENTION

[0017] The invention is further illustrated by the following examples, but the invention is not limited to the following examples, unless otherwise indicated, all amounts given by "parts" and "percents" should be understood as being by weight. of. The following materials were used to produce the polyurethane foam of the examples:

[0018] Table 1 Introduction to Polyurethane Raw Materials

[Table 1]

 [0019] The preparation method of the polyester mesh flexible polyurethane foam comprises the following steps: (1) a polyester polyol, a catalyst, a foaming agent, a foam stabilizer and an isocyanate component; The components listed in 2 were transported to the foaming machine head by the metering pump according to the weight ratio in Table 2, and after high-speed stirring, uniformly distributed on the kraft paper of the continuous foaming production line to produce a semi-finished foam material of 2.4 m length. These foams are prepared using a line mixing foaming step known to those of ordinary skill in the art to determine foam properties after the foam has been cured.

 [0020]

 [0021] Table 2 polyester polyurethane flexible foam component formula

[]

 [0022] In the examples, one or two polyester polyols are used as a main raw material. If you want to adjust the foaming speed, you can adjust the amount of catalyst; if you want to adjust the foam density, you can adjust the amount of water and physical foaming agent.

 [0023] The apparent density, 25% indentation hardness, tensile strength, elongation, and 50% compression set/<3⁄4 of these critical foam properties are summarized and compared, some are better, some are worse. However, the most suitable raw material ratio can be achieved by adjusting the ratio of each compound, and the performance is up to standard and the cost is optimized.

 [0024] Table 3 polyester polyester polyurethane flexible foam parameters

 []

 [0025] The cooked polyurethane soft sponge foam is cut into a blasting box, and according to the external temperature, the corresponding proportion of the required gas, such as acetylene, oxygen, nitrogen, etc., is reached, and the gas explosion equilibrium point is detonated, and the pupil is obtained. Sponge reticulated foam. The foam properties after blasting are shown in Table 4 below.

 [0026] Table 4 network polyester polyester polyurethane flexible foam parameters

[]

 [0027] Like the ordinary polyurethane foam, the reticulated foam can be adjusted according to the raw materials to obtain foams of different properties. The physical properties of the foam before and after the net treatment are shown in Table 4. Compared with the foam before the net treatment, the tensile strength and elongation of the reticulated foam increased, while the hardness and density of the indentation decreased slightly.

 [0028] The foregoing embodiments of the invention have been presented for purposes of illustration It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. The scope of the invention is defined by the appended claims.

Claims

Claim  A polyester-type polyurethane flexible foamed plastic, characterized in that: foaming is carried out by using at least one polyester polyol as a raw material together with an isocyanate component and a catalyst, a foaming agent and a foam stabilizer. Polymerized to form a polyurethane soft foam plastic, and obtained a reticulated foam having a pupil ratio of 99% or more.  2. A method for preparing a polyester-type polyurethane flexible foamed plastic according to claim 1, characterized in that at least one polyester polyol is used as a raw material and an isocyanate component, a catalyst, a foaming agent, The foaming polymerization is carried out under the action of a foam stabilizer to form a polyurethane soft foam plastic, which is subjected to reticulation treatment.  The method for preparing a polyester mesh flexible polyurethane foam according to claim 2, comprising the steps of: (1) using a polyester polyol, a catalyst, a foaming agent, and a foam stabilizer; The isocyanate component is transported to the foaming machine head in a fixed proportion by a metering pump, and after high-speed stirring, uniformly clothed on the kraft paper of the continuous foaming production line; (2) aging in the process of continuous foaming production line, solidifying and forming polyurethane soft foam plastic, and then cutting it into a specified size on-line; (3) reticulating the cured polyurethane soft foam plastic deal with.  The method for preparing a polyester mesh flexible polyurethane foam according to claim 2 or 3, wherein the polyester polyol is a phthalic anhydride polyester polyol, wherein the average functionality is 2 3, a hydroxyl value of 10-200mgK0H / g, preferably a functionality of 2. 0-2. 5, a hydroxyl value between 50-150mgKOH / g; the isocyanate component is toluene diisocyanate, diphenylformamidine One or more of isocyanate or polyphenyl polyisocyanate; mass ratio of polyester polyol to isocyanate component is 100: 40-60 o The method for preparing a polyester mesh flexible polyurethane foam according to claim 2 or 3, wherein the catalyst is an amine and/or a metal salt catalyst; the foaming agent is physically and/or separately Chemical blowing agent. Replacement page (Article 26) The method for preparing a polyester mesh flexible polyurethane foam according to claim 5, wherein the amine catalyst and the metal salt catalyst are tertiary amine catalysts, At least one of pentamethyldiethylenetriamine, hydrazine, hydrazine-dimethylcyclohexylamine, triethylenediamine, triethylamine, bisdimethylaminoethyl ether; the metal salt catalyst is different At least one of potassium octoate, quaternary ammonium formate, potassium acetate, dibutyltin dilaurate, stannous octoate and potassium oleate.  The method for preparing a polyester mesh flexible polyurethane foam according to claim 5, wherein: the physical foaming agent is water; and the chemical foaming agent is 1, 1- Dichloro-1_fluoroacetamidine (HCFC- 141B), 1, 1, 1, 3, 3-pentafluoropropane (HFC-245fa) and 1, 1, 1, 3, 3-pentafluorobutane (HFC At least one of -365). The method for preparing a polyester mesh flexible polyurethane foam according to claim 2 or 3, wherein the reticulation treatment method is an alkali immersion method, an explosion method, a steam hydrolysis method or Hot air method.  9 . The method for preparing a polyester mesh flexible polyurethane foam according to claim 8 , wherein: the explosion method comprises cutting the mature polyurethane flexible foam into a blasting box according to the outside world. The temperature is filled with the corresponding proportion of gas required to reach the gas explosion equilibrium point, and then detonated to obtain an open-cell sponge reticulated foam.  10. The method for preparing a polyester mesh flexible polyurethane foam according to claim 9, wherein the gas is acetylene, oxygen or nitrogen. 8  Replacement page (Article 26)