Hydrophobic high-strength polyurethane soft foam and preparation method and application thereof

Abstract

The present invention belongs to the technical field of polyurethane soft foam, and specifically relates to a hydrophobic high-strength polyurethane soft foam and its preparation method and application. The hydrophobic high-strength polyurethane soft foam described in the present invention is composed of component A and component B in a mass ratio of 100: (58-60), and component A includes the following raw materials: vegetable oil-modified polyester polyol, silane-modified polyether polyol, silicone oil, catalyst, chain extender, foaming agent; component B includes the following raw materials and inhibitor: polyether polyol 1, hydroxy fluorosilicone oil, pure MDI, liquefied MDI. The hydrophobic high-strength polyurethane soft foam of the present invention has excellent mechanical properties, hydrophobic properties and anti-aging properties, as well as good elasticity and wear resistance. It is applied to mouse pads, and the pores are fine and the hydrophobicity is good, which meets market demand; the present invention also provides its preparation method.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane soft foams, and specifically relates to a hydrophobic high-strength polyurethane soft foam and a preparation method and application thereof. Background Art

[0002] Mouse pad is a commonly used computer accessory. It is a small pad placed under the mouse. It is mainly used to provide a plane for the mouse sensor system to calculate the moving vector, ensure the accuracy of mouse positioning, and reduce the wear of the mouse bottom pad. Because it needs to be in contact with the palm for a long time, it needs to have good elasticity and flexibility. In addition, the durability and easy cleaning of the mouse pad are also the focus of attention.

[0003] At present, the materials of mouse pads mainly include cloth, synthetic resin, plastic, glass and metal. Among them, cloth mouse pads are the most common. They are usually made of woven cloth or rubber, with a layer of non-slip textured rubber added to the bottom to enhance the friction between the desktop and increase the stability of the mouse pad. Cloth mouse pads are divided into traditional cloth and special cloth. The latter is rougher in touch and is suitable for competitive and shooting game players.

[0004] In addition to cloth mouse pads, synthetic resin mouse pads are also favored by gamers. The outer layer of this type of mouse pad is made of synthetic resin material, which has excellent smoothness and can meet the high-frequency movement needs of gamers. Plastic mouse pads are widely popular for their low price and easy cleaning, but their wear resistance is relatively low.

[0005] CN117510778A discloses a polyurethane material for a mouse pad and a preparation method thereof. The mouse pad prepared by the method has the characteristics of softness, low hardness and good wear resistance, but it uses raw materials such as polytetramethylene ether polyol and isophorone diisocyanate, which increases the manufacturing cost; secondly, the manufacturing process is cumbersome, the energy consumption is high, and inflammable and volatile acetone gas is easily generated during the production process.

[0006] Polyurethane soft foam has the characteristics of light weight, large bearing capacity, simple manufacturing, etc. It also has good elasticity and flexibility. If it is used in mouse pads, it can effectively improve comfort, enhance anti-slip performance and wear resistance and durability. Therefore, it is necessary to further develop polyurethane soft foam to meet the needs of mouse pad products. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a hydrophobic high-strength polyurethane soft foam, which has excellent mechanical properties, hydrophobic properties and anti-aging properties, as well as good elasticity and wear resistance. When applied to a mouse pad, the foam has fine pores and good hydrophobicity, thus meeting market demand. The present invention also provides a preparation method thereof.

[0008] The hydrophobic high-strength polyurethane soft foam of the present invention is composed of component A and component B in a mass ratio of 100:(58-60), wherein component A includes the following raw materials in parts by mass:

[0009] Vegetable oil modified polyester polyol: 30-50 parts;

[0010] Silane modified polyether polyol: 50-70 parts;

[0011] Silicone oil: 0.5-1.0 parts;

[0012] Catalyst: 1.0-1.5 parts;

[0013] Chain extender: 2.0-3.0 parts;

[0014] Foaming agent: 1.5-1.7 parts;

[0015] Component B includes the following raw materials and inhibitors in parts by weight:

[0016] Polyether polyol 1: 25-35 parts;

[0017] Hydroxyfluorosilicone oil: 5-10 parts;

[0018] Pure MDI: 40-45 parts;

[0019] Liquefied MDI: 20-25 parts;

[0020] Among them, the dosage of the inhibitor is 20ppm.

[0021] The vegetable oil modified polyester polyol is prepared by esterification reaction of diethylene glycol, trimethylolpropane, adipic acid, isophthalic acid and vegetable oil, with a hydroxyl value of 60-80 mgKOH / g and an acid value of ≤1.0 mgKOH / g; the vegetable oil is one or more of soybean oil, palm oil and castor oil, preferably castor oil.

[0022] The specific preparation process of the vegetable oil modified polyester polyol is as follows: adipic acid, isophthalic acid, diethylene glycol and trimethylolpropane in a mass ratio of 1: (0.4-0.55): (1.0-1.3): (0.05-0.08) are added into a reaction kettle, and then vegetable oil is added, and an esterification reaction is carried out at 220-230° C. to obtain a vegetable oil modified polyester polyol, wherein the amount of vegetable oil added accounts for 15-20wt.% of the total feed amount (excluding vegetable oil) of the esterification reaction.

[0023] The silane-modified polyether polyol is obtained by using glycerol as an initiator and alkylene oxide as a polymerization monomer, undergoing polymerization reaction under the action of an alkali catalyst, and then adding a silane coupling agent for reaction. The functionality is 3 and the hydroxyl value is 32-36 mgKOH / g.

[0024] The silane coupling agent is one or more of KH-550, KH-560, KH-570, preferably KH-550.

[0025] The specific preparation process of the silane-modified polyether polyol is as follows: glycerol, alkaline catalyst potassium hydroxide and alkylene oxide are added to a reaction kettle for ring-opening polymerization for 1 hour, followed by bubbling under a vacuum condition of -0.091 MPa for 1 hour, cooling to 80°C, and then neutralizing, adsorbing, drying and filtering, and then adding a silane coupling agent to obtain a silane-modified polyether polyol, wherein the mass ratio of glycerol to alkylene oxide is 1: (47-57), the amount of the alkaline catalyst is 0.3wt.% of the sum of the masses of glycerol and alkylene oxide, and the amount of the silane coupling agent added accounts for 3-5wt.% of the total feed amount.

[0026] The alkylene oxide is one or both of propylene oxide and ethylene oxide, preferably propylene oxide.

[0027] The polyether polyol 1 is prepared by ring-opening polymerization of a compound containing an active hydrogen group as an initiator with propylene oxide and ethylene oxide under the action of a catalyst, and has a hydroxyl value of 26-30 mgKOH / g and an acid value of ≤0.05 mgKOH / g. The polyether polyol CHE-628 produced by Changhua Chemical Technology Co., Ltd. is preferred.

[0028] The silicone oil is a polysiloxane-olefin oxide block copolymer, preferably VORASURF TM HR 8835 Additive.

[0029] The hydroxy fluorosilicone oil is polymerized from fluorosilicone monomers, and the molecular chain ends thereof are organic silicon modified materials with hydroxyl groups, and AFS-L-1001 produced by Shenzhen Guanheng New Material Technology Co., Ltd. is preferred.

[0030] The catalyst is prepared by compounding a delayed gelling catalyst and an amine catalyst, wherein the delayed gelling catalyst and the amine catalyst are compounded in a mass ratio of 1:(0.3-0.5), and the delayed gelling catalyst is preferably a commercially available product of Evonik Industries, Dabco ® 1027. The amine catalyst is preferably FOCAT-8003M, a commercially available product of Guangzhou Yourun Synthetic Materials Co., Ltd.

[0031] The chain extender is ethylene glycol or 1,4-butanediol.

[0032] The foaming agent is water.

[0033] The pure MDI (pure diphenylmethane diisocyanate) is Desmodur 44C from Covestro.

[0034] The liquefied MDI (carbodiimide modified diphenylmethane diisocyanate) is 103C from BASF GmbH.

[0035] (1) Preparation of component A: first, put the vegetable oil-modified polyester polyol and the silane-modified polyether polyol into a reaction kettle and stir them evenly, then add silicone oil, catalyst, chain extender and foaming agent. Under normal temperature conditions, stir at a speed of 45-50 r / min for 50-60 min to obtain component A;

[0036] (2) Preparation of component B: put polyether polyol 1 and hydroxy fluorosilicone oil into a reaction kettle, control the material temperature at 45-50°C, add inhibitor and pure MDI, raise the temperature to 75-85°C, react for 40-45 minutes, then add liquefied MDI, cool to 40-45°C, stir and react to obtain component B;

[0037] (3) Component A and component B are injected into the casting machine material tank respectively, and the material temperature is controlled at 20-25°C. Component A and component B are mixed at the machine head according to a mass ratio of 100: (58-60) and injected into the mold. The mold temperature is controlled at 55-60°C. After 4 minutes, the mold is opened and demolded to obtain a hydrophobic high-strength polyurethane soft foam.

[0038] The hydrophobic high-strength polyurethane soft foam is used in mouse pad products.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) The hydrophobic high-strength polyurethane soft foam of the present invention introduces vegetable oil-modified polyester polyols. On the one hand, the high cohesive energy ester bond structure introduced can effectively improve the strength of the product; on the other hand, the structure contains a hydrophobic long-chain fatty alkane structure, which makes the product have a good hydrophobic effect and meets the application of mouse pad products in hot and humid environments. At the same time, the introduced long-chain fatty alkane structure can improve the miscibility with polyether polyols, make the system more uniform, and make the obtained polyurethane soft foam cells more delicate.

[0041] (2) The hydrophobic high-strength polyurethane soft foam of the present invention adopts high-functionality, high-molecular-weight, and high-activity polyether polyol CHE-628. Its high-functionality structure can form multiple cross-linking points during the reaction, thereby improving the physical properties of the product. At the same time, its higher molecular weight effectively improves the elasticity of the product.

[0042] (3) The hydrophobic high-strength polyurethane soft foam of the present invention utilizes silane-modified polyether polyol to introduce a silane structure into the molecular chain, and utilizes its low surface tension to further improve the hydrophobicity of the product, and fully utilizes its coupling effect to improve the skinning property of the foamed product; at the same time, hydroxy fluorosilicone oil and silane-modified polyether polyol form a synergistic effect, thereby improving the hydrophobicity and anti-aging properties of the product.

[0043] (4) The hydrophobic high-strength polyurethane soft foam of the present invention adopts a compound catalyst to solve the problem of thin skin of the product in the all-water foaming system, which is beneficial to improving the wear resistance of the product. At the same time, the product has good fluidity during the foaming process, reduces the generation of surface bubbles, and does not affect the demolding efficiency.

[0044] (5) The preparation method of the hydrophobic high-strength polyurethane soft foam of the present invention has a simple preparation process and is applied to mouse pad products. The foam pores are fine and the hand feel is comfortable. At the same time, the foam has good wear resistance and hydrophobicity. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with the embodiments and comparative examples. The raw materials used in the embodiments and comparative examples are conventional commercially available raw materials unless otherwise specified, and the process methods used are conventional methods in the art unless otherwise specified. The parts of the raw materials in the embodiments and comparative examples are all parts by mass.

[0046] The raw materials used in the embodiments and comparative examples are described as follows:

[0047] CHE-628: polyether polyol, hydroxyl value 26-30mgKOH / g, acid value ≤0.05mgKOH / g, Changhua Chemical Technology Co., Ltd.;

[0048] INOVOL F330N: polyether polyol, hydroxyl value 32.5-35.5 mgKOH / g, acid value ≤0.08 mgKOH / g, Shandong INOV New Materials Co., Ltd.

[0049] PE-2520: polyester polyol, hydroxyl value 51-59 mgKOH / g, acid value ≤0.5 mgKOH / g, functionality 2, Shandong Yinuowei Polyurethane Co., Ltd.;

[0050] VORASURF TM HR 8835 Additive: Dow Chemical Company;

[0051] Catalyst A33: NIAX A33, a commercial product of Momentive;

[0052] AFS-L-1001: Shenzhen Guanheng New Material Technology Co., Ltd.;

[0053] Dabco ® 1027: Evonik Industries AG;

[0054] FOCAT-8003M: Guangzhou Yourun Synthetic Materials Co., Ltd.

[0055] Pure MDI: Desmodur 44C, Covestro Polymers China Co., Ltd.;

[0056] Liquefied MDI: 103C, BASF GmbH.

[0057] The vegetable oil-modified polyester polyol and silane-modified polyether polyol used in the embodiments and comparative examples are described as follows:

[0058] The vegetable oil modified polyester polyol is prepared by esterification reaction of diethylene glycol, trimethylolpropane, adipic acid, isophthalic acid and vegetable oil. The hydroxyl value is 60-80 mgKOH / g, the acid value is ≤1.0 mgKOH / g, and the mass ratio of adipic acid, isophthalic acid, diethylene glycol and trimethylolpropane is 1: (0.4-0.55): (1.0-1.3): (0.05-0.08). When the amount of vegetable oil added accounts for 15-20wt.% of the total feed amount of the esterification reaction, the obtained product indicators are within the value range. Therefore, taking the mass ratio of adipic acid, isophthalic acid, diethylene glycol, and trimethylolpropane as 1:(0.45):(1.1):(0.07) and the amount of vegetable oil added accounting for 15wt.% of the total feed amount (excluding vegetable oil) of the esterification reaction as an example, vegetable oil-modified polyester polyol is prepared. The specific preparation process is as follows: 378g of adipic acid, 172g of isophthalic acid, 425.3g of diethylene glycol, 26.5g of trimethylolpropane and 150.2g of castor oil are added to a reactor, and an esterification reaction is carried out at 225±5°C to obtain a vegetable oil-modified polyester polyol with a hydroxyl value of 67mgKOH / g and an acid value of 0.89mgKOH / g, which meets the required range.

[0059] Silane-modified polyether polyol is obtained by using glycerol as an initiator and alkylene oxide as a polymerization monomer, and a polymerization reaction occurs under the action of an alkali catalyst, and then a silane coupling agent is added for reaction. The functionality is 3, and the hydroxyl value is 32-36 mgKOH / g. When the mass ratio of glycerol to alkylene oxide is 1: (47-57) and the amount of silane coupling agent added accounts for 3-5wt.% of the total feed amount, the obtained product indicators are within the value range. Therefore, taking the mass ratio of glycerol to alkylene oxide as 1:53.6 and the amount of silane coupling agent added accounting for 4wt.% of the total feed amount as an example, silane-modified polyether polyol was prepared, and the specific preparation process was as follows: 92g glycerol, 0.3wt.% alkaline catalyst potassium hydroxide, and 4931g propylene oxide were added to the reactor, and the ring-opening polymerization reaction was carried out for 1h, followed by bubbling under -0.091MPa vacuum conditions for 1h, cooling to 80°C, and then neutralized, adsorbed, dried, and filtered, and then 200.1g KH-550 was added to obtain a silane-modified polyether polyol with a functionality of 3 and a hydroxyl value of 34mgKOH / g, which met the required range.

[0060] Example 1

[0061] The preparation method of the hydrophobic high-strength polyurethane soft foam is as follows:

[0062] Component A includes the following raw materials in parts by weight:

[0063] Vegetable oil modified polyester polyol: 30 parts;

[0064] Silane modified polyether polyol: 70 parts;

[0065] VORASURF TM HR 8835 Additive: 0.7 parts;

[0066] Catalyst (Dabco ® 1027:FOCAT-8003M=1:0.5): 1.0 copy;

[0067] Ethylene glycol: 3.0 parts;

[0068] Water: 1.5 parts;

[0069] The B component includes the following raw materials and inhibitors in parts by weight:

[0070] CHE-628: 25 copies;

[0071] AFS-L-1001: 10 copies;

[0072] Desmodur 44C: 40 parts;

[0073] 103C: 20 portions;

[0074] The method for preparing a hydrophobic high-strength polyurethane soft foam comprises the following steps:

[0075] (1) Preparation of component A: First, vegetable oil-modified polyester polyol and silane-modified polyether polyol were added into a reactor and stirred evenly, and then VORASURF TM HR 8835 Additive, Catalyst (Dabco ® 1027:FOCAT-8003M=1:0.5), ethylene glycol and water, at room temperature, stirring speed of 45r / min, stirring time of 50min, to obtain component A;

[0076] (2) Preparation of component B: CHE-628 and AFS-L-1001 were added to a reactor, stirring was started, the material temperature was controlled at 45°C, 20 ppm of inhibitor phosphoric acid was added, Desmodur 44C was added, the temperature was raised to 75°C, and after reacting for 40 min, 103C was added, the temperature was lowered to 40°C, and the reaction was stirred to obtain component B with an isocyanate content of 19.2 wt.%;

[0077] (3) Component A and component B are respectively injected into the material tank of the casting machine, the material temperature is controlled at 20°C, component A and component B are mixed at the head of the machine according to a mass ratio of 100:58, and injected into the mold, the mold temperature is controlled at 55°C, and the mold is opened and demolded after 4 minutes to obtain the polyurethane soft foam.

[0078] Example 2

[0079] The preparation method of the hydrophobic high-strength polyurethane soft foam is as follows:

[0080] Component A includes the following raw materials in parts by weight:

[0081] Vegetable oil modified polyester polyol: 50 parts;

[0082] Silane modified polyether polyol: 50 parts;

[0083] VORASURF TM HR 8835 Additive: 0.5 parts;

[0084] Catalyst (Dabco ® 1027:FOCAT-8003M=1:0.5): 1.5 copies;

[0085] 1,4-Butanediol: 2.0 parts;

[0086] Water: 1.7 parts;

[0087] The B component includes the following raw materials and inhibitors in parts by weight:

[0088] CHE-628: 33 copies;

[0089] AFS-L-1001: 5 copies;

[0090] Desmodur 44C: 42 parts;

[0091] 103C: 20 portions;

[0092] The method for preparing a hydrophobic high-strength polyurethane soft foam comprises the following steps:

[0093] (1) Preparation of component A: First, vegetable oil-modified polyester polyol and silane-modified polyether polyol were added into a reactor and stirred evenly, and then VORASURF TM HR 8835 Additive, Catalyst (Dabco ® 1027:FOCAT-8003M=1:0.5), 1,4-butanediol and water, at room temperature, stirring speed of 50r / min, stirring time of 60min, to obtain component A;

[0094] (2) Preparation of component B: CHE-628 and AFS-L-1001 were added to a reactor, stirring was started, the material temperature was controlled at 50°C, 20 ppm of inhibitor phosphoric acid was added, Desmodur 44C was added, the temperature was raised to 80°C, and after reacting for 40 min, 103C was added, the temperature was lowered to 45°C, and the reaction was stirred to obtain component B with an isocyanate content of 19.0 wt.%;

[0095] (3) Component A and component B are respectively injected into the material tank of the casting machine, the material temperature is controlled at 25°C, component A and component B are mixed at the head of the casting machine in a mass ratio of 100:60, and injected into the mold, the mold temperature is controlled at 60°C, and the mold is opened and demolded after 4 minutes to obtain the polyurethane soft foam.

[0096] Example 3

[0097] The preparation method of the hydrophobic high-strength polyurethane soft foam is as follows:

[0098] Component A includes the following raw materials in parts by weight:

[0099] Vegetable oil modified polyester polyol: 38 parts;

[0100] Silane modified polyether polyol: 62 parts;

[0101] VORASURF TM HR 8835 Additive: 1.0 part;

[0102] Catalyst (Dabco ® 1027:FOCAT-8003M=1:0.4): 1.2 copies;

[0103] Ethylene glycol: 1.5 parts;

[0104] 1,4-Butanediol: 1.0 part;

[0105] Water: 1.6 parts;

[0106] The B component includes the following raw materials and inhibitors in parts by weight:

[0107] CHE-628: 30 copies;

[0108] AFS-L-1001: 8 copies;

[0109] Desmodur 44C: 42 parts;

[0110] 103C: 22 parts;

[0111] The method for preparing a hydrophobic high-strength polyurethane soft foam comprises the following steps:

[0112] (1) Preparation of component A: First, vegetable oil-modified polyester polyol and silane-modified polyether polyol were added into a reactor and stirred evenly, and then VORASURF TM HR 8835 Additive, Catalyst (Dabco ®1027:FOCAT-8003M=1:0.4), ethylene glycol, 1,4-butanediol and water, at room temperature, stirring speed of 50r / min, stirring time of 55min, to obtain component A;

[0113] (2) Preparation of component B: CHE-628 and AFS-L-1001 were added to a reactor, stirring was started, the material temperature was controlled at 45°C, 20 ppm of inhibitor phosphoric acid was added, Desmodur 44C was added, the temperature was raised to 85°C and reacted for 40 min, 103°C was added, the temperature was lowered to 45°C, and the reaction was stirred to obtain component B with an isocyanate content of 19.1 wt.%;

[0114] (3) Component A and component B are respectively injected into the material tank of the casting machine, the material temperature is controlled at 25°C, component A and component B are mixed at the head of the casting machine according to a mass ratio of 100:58, and injected into the mold, the mold temperature is controlled at 60°C, and the mold is opened and demolded after 4 minutes to obtain the polyurethane soft foam.

[0115] Example 4

[0116] The preparation method of the hydrophobic high-strength polyurethane soft foam is as follows:

[0117] Component A includes the following raw materials in parts by weight:

[0118] Vegetable oil modified polyester polyol: 45 parts;

[0119] Silane modified polyether polyol: 55 parts;

[0120] VORASURF TM HR 8835 Additive: 0.5 parts;

[0121] Catalyst (DABCO®1027:FOCAT-8003M=1:0.3): 1.0 part;

[0122] 1,4-Butanediol: 2.0 parts;

[0123] Water: 1.6 parts;

[0124] The B component includes the following raw materials and inhibitors in parts by weight:

[0125] CHE-628: 35 copies;

[0126] AFS-L-1001: 7 copies;

[0127] Desmodur 44C: 45 parts;

[0128] 103C: 25 portions;

[0129] The method for preparing a hydrophobic high-strength polyurethane soft foam comprises the following steps:

[0130] (1) Preparation of component A: First, vegetable oil-modified polyester polyol and silane-modified polyether polyol were added into a reactor and stirred evenly, and then VORASURF TM HR 8835 Additive, Catalyst (Dabco ® 1027:FOCAT-8003M=1:0.3), 1,4-butanediol and water, at room temperature, stirring speed of 45r / min, stirring time of 60min, to obtain component A;

[0131] (2) Preparation of component B: CHE-628 and AFS-L-1001 were added to a reactor, stirring was started, the material temperature was controlled at 45°C, 20 ppm of inhibitor phosphoric acid was added, Desmodur 44C was added, the temperature was raised to 80°C, reacted for 45 min, 103C was added, the temperature was lowered to 45°C, and the reaction was stirred to obtain component B with an isocyanate content of 19.0 wt.%;

[0132] (3) Component A and component B are respectively injected into the material tank of the casting machine, the material temperature is controlled at 25°C, component A and component B are mixed at the head of the casting machine according to a mass ratio of 100:58, and injected into the mold, the mold temperature is controlled at 60°C, and the mold is opened and demolded after 4 minutes to obtain the polyurethane soft foam.

[0133] Comparative Example 1

[0134] This comparative example 1 is the same as Example 1, except that the silane-modified polyether polyol in component A is replaced by INOVOL F330N produced by Shandong INOVOL New Materials Co., Ltd., and the mass fraction is changed to 55 parts. The remaining raw materials, mass fractions of raw materials, and steps are the same as those in Example 1.

[0135] Comparative Example 2

[0136] This comparative example is the same as Example 2, except that FOCAT-8003M in the catalyst is replaced with A33 of the same mass fraction, and its dosage is the same as that of Dabco ® The mass ratio of 1027 remains unchanged, and the remaining steps are the same as in Example 2.

[0137] Comparative Example 3

[0138] This comparative example is the same as Example 4, except that the polyether polyol CHE-628 in component B is replaced by INOVOL F330N, and the mass fraction is changed to 34 parts. The remaining raw materials, mass fractions of raw materials, and steps are the same as those in Example 4.

[0139] Comparative Example 4

[0140] The preparation method of the hydrophobic high-strength polyurethane soft foam is as follows:

[0141] Component A includes the following raw materials in parts by weight:

[0142] Vegetable oil modified polyester polyol: 30 parts;

[0143] Silane modified polyether polyol: 70 parts;

[0144] VORASURF TM HR 8835 Additive: 0.7 parts;

[0145] Catalyst (Dabco ® 1027:FOCAT-8003M=1:0.5): 1.0 copy;

[0146] Ethylene glycol: 3.0 parts;

[0147] Water: 1.5 parts;

[0148] The B component includes the following raw materials and inhibitors in parts by weight:

[0149] CHE-628: 40 copies;

[0150] Desmodur 44C: 42 parts;

[0151] 103C: 23 copies;

[0152] The method for preparing a hydrophobic high-strength polyurethane soft foam comprises the following steps:

[0153] (1) Preparation of component A: First, vegetable oil-modified polyester polyol and silane-modified polyether polyol were added into a reactor and stirred evenly, and then VORASURF TM HR 8835 Additive, Catalyst (Dabco ® 1027:FOCAT-8003M=1:0.5), ethylene glycol and water, at room temperature, stirring speed of 45r / min, stirring time of 50min, to obtain component A;

[0154] (2) Preparation of component B: CHE-628 was added into a reactor, stirring was started, the material temperature was controlled at 45°C, 20 ppm of inhibitor phosphoric acid was added, Desmodur 44C was added, the temperature was raised to 75°C, reacted for 40 min, 103°C was added, the temperature was lowered to 40°C, and the reaction was stirred to obtain component B with an isocyanate content of 19.1 wt.%;

[0155] (3) Component A and component B are respectively injected into the material tank of the casting machine, the material temperature is controlled at 20°C, component A and component B are mixed at the head of the machine according to a mass ratio of 100:58, and injected into the mold, the mold temperature is controlled at 55°C, and the mold is opened and demolded after 4 minutes to obtain the polyurethane soft foam.

[0156] Comparative Example 5

[0157] This comparative example is the same as Example 1, except that the vegetable oil-modified polyester polyol in component A is replaced with PE-2520 of Shandong Yinuowei Polyurethane Co., Ltd. in an equal mass fraction, and the remaining steps are the same as Example 1.

[0158] The performance tests were carried out on the polyurethane soft foams prepared in Examples 1-4 and Comparative Examples 1-5, respectively. The elongation at break and tensile strength were tested according to GB / T 3903.22-2008, and the tear strength was tested according to GB / T 529-2008; the rebound rate was tested according to GB / T 6670-2008; the hardness was tested according to GB / T 531-1999; the product density was tested according to GB / T 6343-2009; and the water contact angle was tested according to ASTM D7490-13. The test results are shown in Table 1.

[0159] Table 1 Performance test results of products of Examples 1-4 and Comparative Examples 1-5

[0160]

[0161] It can be seen from Table 1 above that compared with Comparative Examples 1, 4 and 5, Example 1 has a larger water contact angle. The larger the hydrolysis contact angle, the better the hydrophobic effect. The main reason is that vegetable oil-modified polyester polyols, hydroxy fluorosilicone oils and silane-modified polyether polyols are introduced into the formula. Under the synergistic effect of the long-chain fatty acid structure, fluorine atoms and silane structure, the product has stronger hydrophobicity, thereby slowing down the aging of the product.

[0162] Compared with Comparative Example 2, the product prepared in Example 2 matures quickly when the mold is opened for 4 minutes, is not easily deformed, and has no obvious dark bubbles on the surface. The reason is that the catalyst used in Example 2 is Dabco ® 1027 and FOCAT-8003M are compounded. The high activity of FOCAT-8003M is beneficial to the skinning and dimensional stability of the product. ® When used in combination with 1027, the product has good fluidity during the foaming process, reduces the generation of surface bubbles, and does not affect the demoulding efficiency.

[0163] Compared with Comparative Example 3, Example 4 shows that component B in Example 4 adopts high-functionality, high-molecular-weight, high-activity polyether polyol CHE-628. Its high-functionality structure can form multiple cross-linking points in the reaction, thereby improving the physical properties of the product. At the same time, its higher molecular weight improves the elasticity of the product.

Claims

1. A hydrophobic high-strength polyurethane soft foam, characterized in that: It is composed of component A and component B in a mass ratio of 100:(58-60), wherein component A includes the following raw materials in mass fractions: Vegetable oil modified polyester polyol: 30-50 parts; Silane modified polyether polyol: 50-70 parts; Silicone oil: 0.5-1.0 parts; Catalyst: 1.0-1.5 parts; Chain extender: 2.0-3.0 parts; Foaming agent: 1.5-1.7 parts; Component B includes the following raw materials and inhibitors in parts by weight: Polyether polyol 1: 25-35 parts; Hydroxyfluorosilicone oil: 5-10 parts; Pure MDI: 40-45 parts; Liquefied MDI: 20-25 parts; The catalyst in the A component is a delayed gel catalyst and an amine catalyst compounded in a mass ratio of 1: (0.3-0.5), and the amine catalyst is FOCAT-8003M; The foaming agent is water; The vegetable oil modified polyester polyol is prepared by esterification reaction of diethylene glycol, trimethylolpropane, adipic acid, isophthalic acid and vegetable oil, the hydroxyl value is 60-80 mgKOH / g, the acid value is ≤1.0 mgKOH / g, the mass ratio of adipic acid, isophthalic acid, diethylene glycol and trimethylolpropane is 1:(0.4-0.55):(1.0-1.3):(0.05-0.08), the amount of vegetable oil added accounts for 15-20wt.% of the total amount of feed for the esterification reaction, and the total amount of feed for the esterification reaction does not include the mass of the vegetable oil; The silane-modified polyether polyol is obtained by using glycerol as an initiator and alkylene oxide as a polymerization monomer, and undergoing a polymerization reaction under the action of an alkali catalyst, and then adding a silane coupling agent for reaction. The functionality is 3, the hydroxyl value is 32-36 mgKOH / g, the mass ratio of glycerol to alkylene oxide is 1:(47-57), the amount of the alkali catalyst is 0.3wt.% of the sum of the masses of glycerol and alkylene oxide, and the amount of the silane coupling agent added accounts for 3-5wt.% of the total feed amount; The silane coupling agent is one or more of KH-550, KH-560, and KH-570; The polyether polyol 1 is CHE-628.

2. The hydrophobic high-strength polyurethane soft foam according to claim 1, characterized in that: In the vegetable oil-modified polyester polyol, the vegetable oil is one or more of soybean oil, palm oil and castor oil.

3. The hydrophobic high-strength polyurethane soft foam according to claim 1, characterized in that: The alkylene oxide is one or both of propylene oxide and ethylene oxide.

4. The hydrophobic high-strength polyurethane soft foam according to claim 1, characterized in that: The silicone oil is a polysiloxane-olefin oxide block copolymer.

5. The hydrophobic high-strength polyurethane soft foam according to claim 1, characterized in that: The hydroxy fluorosilicone oil is polymerized from fluorosilicone monomers, and the molecular chain ends of the hydroxyl-containing organic silicon modified materials.

6. The hydrophobic high-strength polyurethane soft foam according to claim 1, characterized in that: The chain extender is ethylene glycol or 1,4-butanediol.

7. A method for preparing the hydrophobic high-strength polyurethane soft foam according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Preparation of component A: first, put the vegetable oil-modified polyester polyol and the silane-modified polyether polyol into a reaction kettle and stir them evenly, then add silicone oil, catalyst, chain extender and foaming agent. Under normal temperature conditions, stir at a speed of 45-50 r / min for 50-60 min to obtain component A; (2) Preparation of component B: put polyether polyol 1 and hydroxy fluorosilicone oil into a reaction kettle, control the material temperature at 45-50°C, add inhibitor and pure MDI, raise the temperature to 75-85°C, react for 40-45 minutes, then add liquefied MDI, cool to 40-45°C, stir and react to obtain component B; (3) Component A and component B are respectively injected into the material tank of the casting machine, and the material temperature is controlled at 20-25°C. Component A and component B are mixed at the head of the machine according to a mass ratio of 100: (58-60), and injected into the mold. The mold temperature is controlled at 55-60°C, and then the mold is opened and demolded to obtain a hydrophobic high-strength polyurethane soft foam.

8. An application of the hydrophobic high-strength polyurethane soft foam according to any one of claims 1 to 6, characterized in that: Use it for mouse pad products.

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