Damping material for protective clothing and preparation method of damping material

Abstract

The invention discloses a damping material for protective clothing and a preparation method of the damping material. The damping material is composed of a component A and a component B. The component A comprises low-resilience polyether polyol, other polyols, polyborosiloxane, a chain extender, a catalyst, a foaming agent and a foam stabilizer. The use amount of the low-resilience polyether polyol is 40 to 60 parts by mass, the use amount of the other polyols is 15 to 60 parts by mass, and the use amount of the polyborosiloxane is 5 to 20 parts by mass; and the component B is low-resilience isocyanate. According to the shock-absorbing material, the low-resilience polyether polyol, the polyborosiloxane hydroxyl silicone oil and the like are added to serve as main modes for reducing resilience and absorbing shock, so that the shock resistance and the low-temperature resistance of a product are improved. Under the environment of 0 DEG C and below 0 DEG C, the hardness change is small, the comfort degree is not affected when the material is used under the low-temperature environment, and the material is particularly suitable for being used under the northern environment of 0 DEG C or below.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane, and in particular to a shock-absorbing material for protective gear and a preparation method thereof. Background Art

[0002] Materials commonly used in sports protective equipment, such as EVA, PU, ​​TPU or ordinary polyurethane slow rebound materials, all have good energy absorption properties. When these materials receive impact loads, they can absorb energy by deformation, thereby reducing the damage of the impact force to the human body.

[0003] The energy absorption performance of a material is related to its structure and properties. Generally speaking, the denser the structure of a material, the better its energy absorption performance; the softer the nature of a material, the better its energy absorption performance.

[0004] At present, sports protective gear using polyurethane materials has the disadvantages of insufficient shock absorption performance, too thick products, and obvious hardening at low temperatures. The application of polyurethane materials in the preparation of sports protective gear is limited. On the basis of achieving construction performance, density, hardness, etc., when the temperature is low, various properties will be reduced, resulting in serious impact on the comfort of use in low temperature environments. Most of the protective gears available on the market have the following disadvantages: poor impact resistance, poor wear resistance, heavy weight, inconvenient movement, and limited protective effect. Therefore, it is urgent to develop a shock-absorbing material with good impact resistance and low temperature resistance. Summary of the invention

[0005] The present invention aims to solve the problems existing in the prior art and provide a shock-absorbing material for protective gear and a preparation method thereof.

[0006] In order to achieve the above-mentioned purpose, the present invention proposes the following technical scheme: a shock-absorbing material, consisting of component A and component B, wherein component A includes low-resilience polyether polyol, other polyols, polyborosiloxane, chain extender, catalyst, foaming agent, and foam stabilizer; by weight ratio, the low-resilience polyether polyol is used in an amount of 40-60 parts, the other polyols are used in an amount of 15-60 parts, and the polyborosiloxane is used in an amount of 5-20 parts; and component B is low-resilience isocyanate.

[0007] Furthermore, the low resilience polyether polyol has a hydroxyl value of 150-200 mgKOH / g and a molecular weight of 850-1100.

[0008] Furthermore, the preparation method of the low-resilience polyether polyol is as follows: using glycerol or trimethylolpropane as an initiator, vacuum dehydration at 110°C for 2h, turning off the vacuum, slowly adding propylene oxide at 110-120°C and stirring, controlling the pressure below 0.4Mpa, and finally controlling the hydroxyl value of the polyol to 150-200mgKOH / g and the molecular weight to 850-1100.

[0009] Furthermore, the mass of the initiator accounts for 8-15% of the total mass of the low-resilience polyether polyol, and the mass of the propylene oxide accounts for 75-82% of the total mass of the low-resilience polyether polyol.

[0010] Furthermore, the polyborosiloxane adding method is as follows: using monohydroxy silicone oil as a solvent, polyborosiloxane and monohydroxy silicone oil are mixed in a weight ratio of 3:1, and continuously stirred at 80-90° C. until the polyborosiloxane is completely dissolved.

[0011] Furthermore, the added amount of the polyborosiloxane is 5-20 parts.

[0012] Furthermore, the other polyol is a polyether triol with a functionality of 3, a viscosity of 1200-2000 mpa.s, a hydroxyl value of 26-35 mgKOH / g, a molecular weight of 5000-6000, excellent segment flexibility, and its products are less sensitive to low temperatures; Shell MC28-02 or Shandong Bluestar Dongda EP-3600 is preferred.

[0013] Furthermore, the B component is a low-resilience isocyanate, specifically a prepolymerized polyol and MDI100 or MDI50, wherein the polyol is selected from the halogenated HM-10100 or HM-10200 with a molecular weight of 2500-3500 and a functionality of 2-4.

[0014] Furthermore, the NCO content of the low-resilience isocyanate is 18-23%. The use of the isocyanate of the above-mentioned B component can increase energy absorption while maintaining good low-temperature flexibility.

[0015] Furthermore, the chain extender is one or more of ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, and 1,4-butanediol; the amount used is 1.0-8.0 parts.

[0016] Furthermore, the foaming agent is water, with an amount of 0.8-1.5 parts.

[0017] Furthermore, the catalyst is an organic amine catalyst, which is compounded by 60% triethylenediamine and 40% trimethylhydroxyethylethylenediamine, has low atomization, and has better pore opening effect than traditional catalysts; the catalyst usage is 0.1-3.0 parts.

[0018] Furthermore, the foaming agent is silicone oil, silicone or polysiloxane-olefin oxide block copolymer silicone oil, preferably Jiangsu Meside Chemical M-7742 or M-7715, and the amount of the foaming agent used is 0.1-2.0 parts.

[0019] The present invention also discloses a method for preparing a shock-absorbing material, the method comprising the following steps: S1. The low-resilience polyether polyol, other polyols, polyborosiloxane, chain extender, foaming agent, catalyst, and blowing agent are mixed uniformly in proportion to form component A, and the isocyanate component B is also prepared; S2. Add component A into the A cylinder of the pouring machine, and add component B into the B cylinder of the pouring machine; S3. Component A and component B are mixed and stirred by a casting machine gun head, and then discharged and injected into a mold. The two components are reacted and formed in the mold to obtain a shock-absorbing material; Furthermore, the process conditions are: high-speed stirring and mixing for 5-8 seconds, material temperature of 25-35°C, mold temperature of 40-60°C, aging time of 5-8 minutes, and ratio of component A / component B: 100 / 60-80.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. The shock-absorbing material of the present invention increases the impact resistance and low-temperature resistance of the product by adding low-rebound polyether polyol and polyborosiloxane hydroxy silicone oil as the main method to reduce rebound shock absorption.

[0021] 2. The hardness of the present invention changes little in an environment of 0°C or below, and the comfort of use in a low-temperature environment is not affected. It is particularly suitable for use in an environment below zero in the north.

[0022] 3. The shock-absorbing material of the present invention is applied to the preparation of sports protective gear such as wrist guards, knee pads, elbow pads, etc., which improves the impact resistance and low temperature resistance on the basis of achieving various aspects such as construction performance, density, and hardness. DETAILED DESCRIPTION

[0023] The present invention is further described below by way of examples, but they are not intended to limit the present invention. Example 1

[0024] A shock-absorbing material is formed by mixing and foaming component A and component B, wherein component A comprises (by weight): 40 parts of low-resilience polyether polyol; 5 parts of polyborosiloxane; 50 parts of other polyols; 0.2 parts of foam stabilizer; 1 part of catalyst; 0.8 parts of foaming agent water; 3 parts of chain extender; and 60 parts of isocyanate of component B. Example 2

[0025] A shock-absorbing material is formed by mixing and foaming component A and component B, wherein component A comprises (by weight): 50 parts of low-resilience polyether polyol; 10 parts of polyborosiloxane; 35 parts of other polyols; 2 parts of foam stabilizer; 1 part of catalyst; 1 part of foaming agent water; 1 part of chain extender; and 70 parts of component B isocyanate. Example 3

[0026] A shock-absorbing material is formed by mixing and foaming component A and component B, wherein component A comprises (by weight): 60 parts of low-resilience polyether polyol; 20 parts of polyborosiloxane; 15 parts of other polyols; 1 part of foam stabilizer; 1 part of catalyst; 1 part of foaming agent water; 2 parts of chain extender; and 80 parts of isocyanate of component B.

[0027] According to the dosage in the formula of the above embodiments 1-3, low-resilience polyether polyol, other polyols, polyborosiloxane, chain extender, foam leveling agent, catalyst and foaming agent are mixed uniformly in proportion to form component A, and isocyanate component B is prepared separately; component A is added into the material cylinder A of the casting machine, and component B is added into the material cylinder B of the casting machine; component A and component B are discharged after being stirred and mixed by the gun head of the casting machine, and injected into the mold, the material temperature is 25-35°C, the mold temperature is 40-60°C, the aging time is 5-8min, and the two components are reacted and formed in the mold to obtain a shock-absorbing material.

[0028] Comparative example: The shock-absorbing material used by a domestic customer in protective gear products was used.

[0029] The shock-absorbing materials prepared in Examples 1-3 and the shock-absorbing materials in the comparative example were prepared into protective gear of the same density and size, and their performance was tested. The testing standard was in accordance with GB / T 24451-2020 "Slow Rebound Soft Polyurethane Foam Plastics" and physical properties were tested at room temperature. According to the SRIS 0101 standard, an Asker C-type hardness tester was used to test the hardness change at 0°C, -10°C and -20°C. A 5 kg hemispherical impact head was used to test the impact transmission force under the same impact energy under a drop height of 107.95 cm. The test results are shown in the following table: ;

[0030] As can be seen from the above table, the shock-absorbing materials prepared in Examples 1-3 have excellent physical properties such as hardness and compression permanent deformation at room temperature, which are not much different from the performance of the comparative example, but the recovery time change and hardness change of Examples 1-3 in low temperature environments (0°C, -10°C and -20°C) are smaller than those in normal temperature environments (25°C), while the recovery time change and hardness change of the comparative example in low temperature environments (0°C, -10°C and -20°C) are larger than those in normal temperature environments (25°C). Therefore, the use process of the shock-absorbing material of the present invention is less affected by temperature and can meet the use in sub-zero environments in the north.

[0031] The impact transmission force (kN) of Examples 1-3 is significantly smaller than that of the comparative example, indicating that the shock absorbing material of the present invention has a higher impact resistance.

[0032] The above description is only a preferred example of the present invention and is not any formal or substantial limitation to the present invention. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. Any equivalent changes and modifications made to the above examples based on the essential technology of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A shock absorbing material, characterized in that: The invention is composed of component A and component B, wherein component A includes low-resilience polyether polyol, other polyols, polyborosiloxane, chain extender, catalyst, foaming agent and foam stabilizer; by weight ratio, the low-resilience polyether polyol is used in an amount of 40-60 parts, the other polyols are used in an amount of 15-60 parts, and the polyborosiloxane is used in an amount of 5-20 parts; and component B is low-resilience isocyanate; The other polyol is a polyether triol with a functionality of 3, a viscosity of 1200-2000 mPa.s, a hydroxyl value of 26-35 mgKOH / g, and a molecular weight of 5000-6000.

2. The shock absorbing material according to claim 1, characterized in that: The preparation method of the low-resilience polyether polyol is as follows: using glycerol or trimethylolpropane as an initiator, vacuum dehydration at 110° C. for 2 hours, closing the vacuum, slowly adding propylene oxide at 110-120° C. and stirring, and controlling the pressure below 0.4 MPa. Finally, the hydroxyl value of the low-resilience polyether polyol is controlled at 150-200 mgKOH / g, and the molecular weight is controlled at 850-1100.

3. The shock absorbing material according to claim 2, characterized in that: The mass of the initiator accounts for 8-15% of the total mass of the low-resilience polyether polyol, and the mass of the propylene oxide accounts for 75-82% of the total mass of the low-resilience polyether polyol.

4. The shock absorbing material according to claim 1, characterized in that: The method for adding the polyborosiloxane is as follows: using monohydroxy silicone oil as a solvent, mixing the polyborosiloxane and the monohydroxy silicone oil in a weight ratio of 3:1, and continuously stirring at 80-90° C. until the polyborosiloxane is completely dissolved.

5. The shock absorbing material according to claim 1, characterized in that: The B component is a low-resilience isocyanate, which is prepared by prepolymerization of a polyol and MDI100 or MDI50. The molecular weight of the polyol is 2500-3500 and the functionality is 2-4.

6. The shock absorbing material according to claim 5, characterized in that: The NCO content of the low resilience isocyanate is 18-23%.

7. The shock absorbing material according to claim 1, characterized in that: The catalyst is an organic amine catalyst, which is compounded by 60% of triethylenediamine and 40% of trimethylhydroxyethylethylenediamine, and the usage amount of the catalyst is 0.1-3.0 parts.

8. A method for preparing a shock absorbing material according to any one of claims 1 to 7, characterized in that: The steps include: S1. The low-resilience polyether polyol, other polyols, polyborosiloxane, chain extender, foaming agent, catalyst, and blowing agent are mixed uniformly in proportion to form component A, and the isocyanate component B is also prepared; S2. Add component A into the A cylinder of the pouring machine, and add component B into the B cylinder of the pouring machine; S3. Component A and component B are mixed and stirred by a casting machine gun head and then discharged and injected into a mold. The two components are reacted and formed in the mold to obtain a shock-absorbing material.

9. The method for preparing a shock absorbing material according to claim 8, characterized in that: Stirring and mixing time is 5-8s, mold temperature is 40-60℃, reaction time is 5-8min, component A / component B: 100 / 60-80.

10. Use of the shock absorbing material according to claim 7 in sports protective gear, characterized in that: The shock-absorbing material is used in knee and wrist pads.