Polyurethane composition for footbath tubs and method for producing the same

Abstract

The application discloses a polyurethane composition for foot soaking barrels and a preparation method thereof, and belongs to the technical field of polyurethane preparation. The technical scheme is as follows: the polyurethane composition comprises component A and component B in a weight ratio of 1: (1.15-1.25), the component A comprises the following components in parts by weight: 30-40 parts of first polyether polyol, 40-50 parts of second polyether polyol, 5-15 parts of third polyether polyol, 5-15 parts of polyester polyol, 2-3 parts of foam stabilizer, 1.5-3 parts of catalyst and 4.5-5.5 parts of chemical foaming agent; wherein the total parts by weight of the polyether polyols and the polyester polyol in the component A is 100 parts; and the component B is an isocyanate compound. Compared with a wooden barrel, the polyurethane foam product prepared by the application has the advantages of high compressive strength, good heat preservation effect, excellent waterproof performance, difficulty in breeding bacteria, light weight, no cracking, no falling, and long service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polyurethane preparation, in particular to a polyurethane composition for foot soaking barrels and a preparation method thereof. BACKGROUND

[0002] With the improvement of living standards, people's requirements for the quality of life are also getting higher and higher. In their spare time, people generally like to soak their feet in foot soaking barrels to relieve stress and activate the meridians. Foot hot bath is an effective physiotherapy and health care method in traditional Chinese medicine perspiration therapy. When the human foot is stimulated by external temperature, the blood vessels of the foot can be expanded, the skin temperature can be increased, and the blood circulation of the foot and the whole body can be promoted, so as to regulate the function of each endocrine and promote each endocrine to secrete various hormones. Generally speaking, the temperature of the foot soaking water is preferably 40-50℃, and higher water temperature is easy to scald the skin, while lower water temperature cannot achieve the effect.

[0003] Most of the foot soaking barrels sold on the market are basically made of solid wood, and the wooden foot soaking barrels have the following shortcomings: first, wood is prone to breed a large amount of mold in a humid environment, which is harmful to human health, and a large amount of glue is used for bonding in the process of making the foot soaking barrel from wood, which is not environmentally friendly; second, the stability of the wooden foot soaking barrel is poor, which is easy to age or crack, expand and contract with heat, and deform, resulting in short service life; third, the heat preservation performance of the wooden barrel is relatively poor, and the temperature of the water in the barrel is easily reduced due to air convection during the foot soaking process, thereby affecting the foot soaking effect, especially in winter; fourth, the wooden foot soaking barrel is very heavy during transportation, especially for the elderly and children in the family. In addition, there is also an electric heating foot soaking barrel on the market, which realizes the heat preservation of the water in the foot soaking barrel by continuous heating. However, this foot soaking barrel is generally operated with electricity, and if there is a leakage phenomenon, it is easy to cause personal injury, and the safety performance is not high. In addition, it needs to be continuously heated during use, and the power consumption is large. Therefore, there is a need to develop a new material suitable for foot soaking barrels in the field. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, provide a polyurethane composition for foot soaking barrels and a preparation method thereof, and the prepared polyurethane foam product has high compressive strength, good heat preservation effect, excellent waterproof performance, is not easy to breed bacteria, is light in weight, is not easy to crack and fall off, has long service life, and the foaming agent used is water, which is fluorine-free foaming, and the consumption of ozone potential value is zero, which is friendly to the environment and has no pollution.

[0005] The technical scheme of the present application is as follows:

[0006] On the one hand, the present application provides a polyurethane composition for foot soaking barrels, which comprises A component and B component with a weight ratio of 1: (1.4-1.6).

[0007] wherein the A component comprises the following ingredients in parts by weight:

[0008] first polyether polyol 30-40 parts

[0009] second polyether polyol 40-50 parts

[0010] third polyether polyol 5-15 parts

[0011] polyester polyol 5-15 parts

[0012] foam stabilizer 2-3 parts

[0013] catalyst 1.5-3 parts

[0014] chemical blowing agent 4.5-5.5 parts;

[0015] wherein the total parts by weight of the polyether polyols and the polyester polyol in the A component is 100 parts;

[0016] the B component is an isocyanate compound.

[0017] Preferably, in the A component, the first polyether polyol is a polyether polyol having a hydroxyl value of 345-385 mgKOH / g and a viscosity of 2400-3600 mPa.s at 25°C.

[0018] Preferably, in the A component, the second polyether polyol is a polyether polyol having a hydroxyl value of 440-470 mgKOH / g and a viscosity of 13000-17000 mPa.s at 25°C.

[0019] Preferably, in the A component, the third polyether polyol is a polyether polyol having a hydroxyl value of 270-290 mgKOH / g and a viscosity of 200-400 mPa.s at 25°C.

[0020] Preferably, in the A component, the polyester polyol is a polyester polyol having a hydroxyl value of 300-330 mgKOH / g and a viscosity of 2000-3000 mPa.s at 25°C.

[0021] Preferably, in the A component, the catalyst is a mixture of N,N,N,N,N-pentamethyldiethylene triamine, N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine and BX405.

[0022] Preferably, the weight ratio of N,N,N,N,N-pentamethyldiethylene triamine, N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine and BX405 is (0.5-0.7):(0.7-1.0):(1.0-1.2):(0.7-1.0).

[0023] Preferably, in the A component, the chemical foaming agent is water.

[0024] Preferably, in the B component, the isocyanate compound is polymeric diphenylmethane diisocyanate.

[0025] In another aspect, the present application also provides a preparation method of the polyurethane composition for foot bath barrel as described above, comprising the following steps:

[0026] S1: preparing the A component: adding the first polyether polyol, the second polyether polyol, the third polyether polyol, the polyester polyol, the foam stabilizer, the chemical foaming agent and the catalyst of the A component into a reaction kettle, stirring at room temperature for 1.0-1.5 h, and fully mixing to obtain the A component;

[0027] S2: mixing the A component and the B component at 20-25℃ to obtain the polyurethane composition for foot bath barrel.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] 1. The polyurethane foam product prepared by the present application has more advantages in sterilization, heat preservation, firmness, portability, practicality and environmental protection compared with a wooden barrel. The polyurethane foam for foot bath barrel prepared by the present application has high compressive strength, good heat preservation effect, excellent waterproof performance, is not easy to breed bacteria, is light in weight, does not crack or fall off, has long service life, and uses water as the foaming agent, adopts fluorine-free foaming, has zero ozone depletion potential, is friendly to the environment, and has no pollution. The use of the polyurethane composition of the present application to make foot bath barrels also solves the problem of safety hazards existing in the existing electric heating foot bath barrels, and has a wide range of applications and can be applied to public health places, hotels, restaurants and families.

[0030] 2. The polyurethane foam for foot bath barrel of the present application is a high molecular polymer prepared by mixing and foaming through a stirring device using combined polyether and isocyanate as main raw materials under the action of catalysts, foaming agents and other multiple aids. Through the mutual synergistic effect of the macromolecular polyether polyol and the polyester polyol, the prepared polyurethane foam has good heat preservation effect, long service life, and also has the advantages of lightness, sterilization and environmental protection.

[0031] 3. The raw materials used in the present application are all environmentally friendly substances, which are green products, and reduce the pressure of the foot bath barrel industry on the environment. DETAILED DESCRIPTION

[0032] The technical solutions of the present application are described below in combination with examples. The reagents and raw materials used are all purchased through commercial channels. The experimental methods not specified in the following examples are selected according to conventional methods and conditions, or according to the product instructions.

[0033] The raw materials used in the following examples are as follows:

[0034] Polyether polyol NJ-8336: produced by Jurong Ningwu New Material Co., Ltd.;

[0035] Polyether polyol YD-600: produced by Hebei Yadong Group;

[0036] Polyether polyol HF-306: Zhejiang Hengfeng New Material Co., Ltd.;

[0037] Polyester polyol PS-3152C: Stepan (Nanjing) Chemical Co., Ltd.;

[0038] Silicone foam stabilizer M-8842 purchased from Shanghai Maihao Chemical Co., Ltd.;

[0039] Isocyanate is polymeric MDI, purchased from Wanhua Chemical Group Co., Ltd., model PM200.

[0040] Examples 1-3

[0041] The components of the polyurethane composition for foot bath bucket of Examples 1-3 are shown in Table 1.

[0042] Comparative Examples 1-3

[0043] The components of the polyurethane composition for foot bath bucket of Comparative Examples 1-3 are shown in Table 1.

[0044] Table 1

[0045]

[0046] The preparation method of the polyurethane composition for foot bath bucket of Examples 1-3 and Comparative Examples 1-3 includes the following steps:

[0047] S1 Preparation of A component: the first polyether polyol, the second polyether polyol, the third polyether polyol, the polyester polyol, the foam stabilizer, the chemical foaming agent, and the catalyst of the A component are sequentially added to the reaction kettle, stirred at room temperature for 1.0-1.5 h, and fully mixed to obtain the A component;

[0048] S2 Mixing the A component and the B component at 20-25℃ (different mixing temperatures in different seasons) to obtain the polyurethane composition for foot bath bucket.

[0049] Comparative Example 4

[0050] The raw materials for foot bath bucket of Comparative Example 4 are selected from wood.

[0051] The polyurethane compositions prepared in Examples 1-3 and Comparative Examples 1-4 are tested for performance, and the detection standards are as follows:

[0052] Molding density: GB / T6343-2009;

[0053] Thermal conductivity: GB / T10295-2008;

[0054] Compression strength: GB / T8813-2020;

[0055] Dimensional stability: GB / T8811-2008;

[0056] Water absorption test: GB / T8810-2005;

[0057] Service life: service life;

[0058] Anti-aging ability: differential scanning calorimetry and thermogravimetric analysis.

[0059] The test results are shown in Table 2:

[0060] Table 2

[0061]

[0062] From Table 2, it can be seen that the polyurethane foam prepared by the combined polyether has higher compression strength, better thermal insulation effect, higher anti-aging degree and lower water absorption than the wooden foot bucket of Comparative Example 4, and has the advantages of long service life, light weight and excellent environmental protection performance. At the same time, from Examples 1-2 and Comparative Examples 1-2, it can be seen that the performance of the polyurethane composition prepared by combining three polyether polyols with different hydroxyl values and viscosities is better than that of the polyurethane composition prepared by adding only one or two polyether polyols, which shows that the three polyether polyols of the present application play a synergistic effect and improve the performance of the product. At the same time, from Example 3 and Comparative Example 3, it can be seen that after adding the polyester polyol, the performance of the prepared polyurethane composition is more excellent. In addition, the catalyst used in the present application is a mixture of N,N,N,N,N-pentamethyldiethylene triamine, N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine and BX405, and the three catalysts have different performance advantages, such as foam initiation, foam gel, and foam maturation. The synergistic effect of the three can prepare a polyurethane composition that meets the production process.

Claims

1. A polyurethane composition for a foot bath, characterized in that: It includes component A and component B in a weight ratio of 1:(1.4-1.6); Wherein component A comprises the following ingredients in parts by weight: 30-40 parts of the first polyether polyol 40-50 parts of the second polyether polyol 5-15 parts of the third polyether polyol 5-15 parts of polyester polyol 2-3 parts foam stabilizer 1.5-3 parts catalyst 4.5-5.5 parts of chemical foaming agent; Wherein, the total weight parts of polyether polyol and polyester polyol in component A is 100 parts; Component B is an isocyanate compound; In the component A, the first polyether polyol is a polyether polyol having a hydroxyl value of 345-385 mgKOH / g and a viscosity of 2400-3600 mPa·s at 25° C.; In the component A, the second polyether polyol is a polyether polyol having a hydroxyl value of 440-470 mgKOH / g and a viscosity of 13000-17000 mPa·s at 25° C.; In the component A, the third polyether polyol is a polyether polyol having a hydroxyl value of 270-290 mgKOH / g and a viscosity of 200-400 mPa·s at 25° C.; In the component A, the polyester polyol has a hydroxyl value of 300-330 mgKOH / g and a viscosity of 2000-3000 mPa·s at 25°C.

2. The polyurethane composition for foot soaking bucket according to claim 1, wherein In the component A, the catalyst is a mixture of N,N,N′,N″,N″-pentamethyldiethylenetriamine, N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine and BX405.

3. The polyurethane composition for foot soaking bucket according to claim 2, wherein The weight ratio of N,N,N′,N″,N″-pentamethyldiethylenetriamine, N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine and BX405 is (0.5-0.7):(0.7-1.0):(1.0-1.2):(0.7-1.0).

4. The polyurethane composition for foot soaking bucket according to claim 1, wherein In the component A, the chemical foaming agent is water.

5. The polyurethane composition for foot soaking bucket according to claim 1, wherein In the component B, the isocyanate compound is polymeric diphenylmethane diisocyanate.

6. The method for preparing the polyurethane composition for foot soaking bucket according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Prepare component A: add the first polyether polyol, the second polyether polyol, the third polyether polyol, the polyester polyol, the foam stabilizer, the chemical foaming agent, and the catalyst of component A into a reactor, stir at room temperature for 1.0-1.5 hours, and mix thoroughly to obtain component A; S2: Mix component A and component B at 20-25° C. to obtain a polyurethane composition for a foot soaking tub.

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