A method for preparing a degradable hydrophilic polyurethane cosmetic powder puff

Abstract

The invention discloses a method for preparing a degradable hydrophilic polyurethane cosmetic puff. The prepared polyurethane cosmetic puff can be hydrophilic and skin-friendly in feel and can be degraded. The preparation method is simple and easy to operate with low cost. The preparation method of the degradable hydrophilic polyurethane cosmetic puff of the invention comprises the following steps: adding the raw materials in the curing agent A component to a high-speed stirrer, mixing evenly and adjusting the temperature to obtain a polyurethane prepolymer B component; preheating the polyurethane prepolymer B component, preheating the mold at the same time and keeping the temperature constant, adjusting the stirring speed to more than 2000 rpm, adding the polyurethane prepolymer B component to the polyurethane prepolymer B component, stirring for more than 15 seconds, quickly pouring into a mold for molding and ripening for more than 10 hours, and obtaining a degradable hydrophilic polyurethane cosmetic puff.

Description

Technical Field

[0001] The invention relates to a method for preparing a cosmetic powder puff, and more particularly to a method for preparing a degradable hydrophilic polyurethane cosmetic powder puff. Background Art

[0002] As the consumption power of women around the world increases, the cosmetics industry develops rapidly, and the demand for makeup puffs continues to expand. Traditional makeup puffs are generally natural latex or chemical synthetic cotton. Natural latex makeup puffs shed seriously during use, have average water absorption, and have a strong odor due to the addition of vulcanizers, which consumers do not like. Traditional polyurethane sponges use polyoxypropylene as the main raw material, and the resulting puffs have a bad feel, are not skin-friendly, and have a poor consumer experience. At the same time, the makeup puffs on the market are difficult to degrade, so there is an increasing amount of discarded cotton pads that pollute the environment. It is imperative to develop a method for preparing a degradable hydrophilic polyurethane makeup puff. Summary of the invention

[0003] The purpose of the present invention is to solve the problems and shortcomings in the prior art and provide a method for preparing a degradable hydrophilic polyurethane cosmetic powder puff. The prepared polyurethane cosmetic powder puff can be hydrophilic and skin-friendly in feel and can be degraded. The preparation method is simple and easy with low cost.

[0004] The present invention is achieved through the following technical solutions:

[0005] The preparation method of the degradable hydrophilic polyurethane cosmetic powder puff of the present invention comprises the following steps: adding various raw materials in a curing agent A component into a high-speed stirrer, mixing them evenly and adjusting the temperature to obtain a polyurethane prepolymer B component; preheating the polyurethane prepolymer B component, preheating a mold and keeping the temperature constant, adjusting the stirring speed to more than 2000 rpm, adding the polyurethane prepolymer B component to the polyurethane prepolymer B component, stirring for more than 15 seconds, quickly pouring into a mold for molding and ripening for more than 10 hours to obtain a degradable hydrophilic polyurethane cosmetic powder puff;

[0006] The mass ratio of the curing agent component A to the polyurethane prepolymer component B is 1.2-2.5:1;

[0007] The curing agent component A is composed of the following raw materials by weight: 50-60 parts of water, 5-25 parts of wollastonite, 10-40 parts of corn starch, 2-6 parts of emulsifier, 2-4 parts of foam leveling agent, and 0.5-1 part of color paste;

[0008] The preparation method of the polyurethane prepolymer component B is as follows: isocyanate is put into a reaction kettle, and then degradable hydrophilic polyol, trihydroxypropane and phosphoric acid are slowly added, and the reaction is carried out at 80-90° C. for 2-3 hours under nitrogen protection to obtain a polyurethane prepolymer component B with an NCO content of 6-7%.

[0009] The preparation method of the above-mentioned degradable hydrophilic polyurethane cosmetic powder puff of the present invention has a further technical solution that the molecular weight of the degradable hydrophilic polyol is 800-1200, and the hydroxyl value is 93.5-140.25; wherein the preparation method of the degradable hydrophilic polyol is as follows: ε-caprolactone, polyethylene glycol and stannous octoate are added to a reactor according to a molar ratio of 100:40:0.15, stirred and heated to 100-140°C for reaction for more than 4 hours to obtain caprolactone-PEG copolymer polyol, i.e., degradable hydrophilic polyol. A further technical solution is that the molecular weight of the polyethylene glycol is preferably 200-600.

[0010] The preparation method of the above-mentioned degradable hydrophilic polyurethane cosmetic powder puff of the present invention can also have a further technical solution that when preparing the polyurethane prepolymer B component, the mass ratio of isocyanate is 20-45 parts, the mass ratio of degradable hydrophilic polyol is 55-80 parts, and the isocyanate is toluene diisocyanate.

[0011] The preparation method of the above-mentioned degradable hydrophilic polyurethane cosmetic powder puff of the present invention may further include the steps of mixing evenly and adjusting the temperature to 5-15°C; preheating the polyurethane prepolymer B component to 25-35°C; and preheating the mold to 35-45°C.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The degradable hydrophilic polyurethane cosmetic powder puff of the present invention has a PEG in its molecular structure as a hydrophilic group, which can provide a hydrophilic and skin-friendly effect. The PCL segment in the molecular structure is easily biodegradable, and after the PCL segment is degraded, the short-chain PEG can also be smoothly degraded; and degradable corn starch is added to the formula to partially replace the silica fume powder that is not easily degraded, thereby improving the degradability of the polyurethane cosmetic powder puff. The preparation method is simple and easy to implement, and the cost is low. DETAILED DESCRIPTION

[0014] The present invention is described below by means of specific examples, but the present invention is not limited to these examples.

[0015] Example 1

[0016] Preparation of degradable hydrophilic polyols:

[0017] ε-Caprolactone, polyethylene glycol (molecular weight 600) and stannous octoate were added into a reactor equipped with stirring, thermometer and condenser in a molar ratio of 100:40:0.15, and reacted at 120°C for 4 hours to obtain caprolactone-PEG copolymer polyol, which is a degradable hydrophilic polyol. The tested hydroxyl content was 110.

[0018] Preparation of polyurethane prepolymer component B:

[0019] Toluene diisocyanate 360g, caprolactone-PEG copolymer polyol 1000g, trimethylolpropane 3g, phosphoric acid 0.4g,

[0020] 1000g of the above copolymer polyol, trihydroxypropane and phosphoric acid were mixed and dehydrated, and then slowly added into 360g of toluene diisocyanate in batches, and reacted at 85°C for 2h under nitrogen protection to obtain a polyurethane prepolymer B component with an NCO content of 6.4%.

[0021] Curing agent A group distribution ratio:

[0022] 60 parts of water, 10 parts of wollastonite, 30 parts of corn starch, 2.5 parts of emulsifier, 2 parts of foam leveling agent, and 0.5 parts of color paste.

[0023] Preparation of degradable hydrophilic polyurethane powder puff:

[0024] Add the raw materials in the curing agent component A into a high-speed stirrer, mix evenly and adjust the temperature to 10°C to obtain a component A mixture; at the same time, preheat the polyurethane prepolymer component B to 30°C and preheat the mold to 40°C, keeping the temperature constant; adjust the stirring speed to 2000rpm, add the polyurethane prepolymer component B to the component A mixture in a ratio of curing agent component A: polyurethane prepolymer component B = 1.2:1, stir for 15 seconds, quickly pour into the mold for molding and mature for 10 hours to obtain a degradable hydrophilic polyurethane powder puff. The properties are shown in Table 1 after testing.

[0025] Example 2

[0026] Preparation of degradable hydrophilic polyols:

[0027] ε-Caprolactone, polyethylene glycol (molecular weight 400) and stannous octoate were added into a reactor equipped with stirring, thermometer and condenser in a molar ratio of 100:20:0.15, and reacted at 120°C for 4 hours to obtain caprolactone-PEG copolymer polyol, which is a degradable hydrophilic polyol. The tested hydroxyl content was 112.

[0028] Preparation of polyurethane prepolymer component B:

[0029] 360 g toluene diisocyanate, 1000 g caprolactone-PEG copolymer polyol, 3 g trimethylolpropane, 0.4 g phosphoric acid

[0030] 1000g of copolymer polyol, trihydroxypropane and phosphoric acid were mixed and dehydrated, and then slowly added into 360g of toluene diisocyanate in batches, and reacted at 85°C for 2h under nitrogen protection to obtain a polyurethane prepolymer B component with an NCO content of 6.3%.

[0031] Curing agent A group distribution ratio:

[0032] 55 parts of water, 10 parts of wollastonite, 30 parts of corn starch, 2.5 parts of emulsifier, 2 parts of foam leveling agent, 1 part of color paste

[0033] Preparation of degradable hydrophilic polyurethane powder puff:

[0034] Add the raw materials in the curing agent component A into a high-speed stirrer, mix evenly and adjust the temperature to 10°C to obtain a component A mixture; at the same time, preheat the polyurethane prepolymer component B to 30°C, preheat the mold to 40°C, and keep the temperature constant; adjust the stirring speed to 2000rpm, add the polyurethane prepolymer component B to the component A mixture in a ratio of curing agent component A: polyurethane prepolymer component B = 1.5:1, stir for 15 seconds, quickly pour into the mold for molding and mature for 10 hours to obtain a foam for a powder puff. The properties of the foam are shown in Table 1.

[0035] Example 3

[0036] Preparation of degradable hydrophilic polyols:

[0037] ε-Caprolactone, polyethylene glycol 200 and stannous octoate were added into a reactor equipped with stirring, thermometer and condenser in a molar ratio of 100:10:0.15, and reacted at 120°C for 4 hours to obtain caprolactone-PEG copolymer polyol, which is a degradable hydrophilic polyol. The tested hydroxyl content was 115.

[0038] Preparation of polyurethane prepolymer component B:

[0039] 360 g toluene diisocyanate, 1000 g caprolactone-PEG copolymer polyol, 3 g trimethylolpropane, 0.4 g phosphoric acid

[0040] 1000g of the above copolymer polyol, trihydroxypropane and phosphoric acid were mixed and dehydrated, and then slowly added into 360g of toluene diisocyanate in batches, and reacted at 85°C for 2h under nitrogen protection to obtain a polyurethane prepolymer B component with an NCO content of 6.1%.

[0041] Curing agent A group distribution ratio:

[0042] 50 parts of water, 10 parts of wollastonite, 30 parts of corn starch, 2.5 parts of emulsifier, 2 parts of foam leveling agent, and 0.5 parts of color paste.

[0043] Preparation of degradable hydrophilic polyurethane powder puff:

[0044] Add all the raw materials in the curing agent component A into a high-speed stirrer, mix evenly and adjust the temperature to 10°C to obtain a component A mixture; at the same time, preheat the polyurethane prepolymer component B to 30°C, preheat the mold to 40°C, and keep the temperature constant; adjust the stirring speed to 2000rpm, add the polyurethane prepolymer component B to the component A mixture in a ratio of curing agent component A: polyurethane prepolymer component B = 2.5:1, stir for 15 seconds, quickly pour into the mold for molding and mature for 10 hours to obtain a foam for a powder puff. The properties of the foam are shown in Table 1.

[0045] Table 1: Comparative table of properties of degradable hydrophilic polyurethane prepared in various embodiments

[0046] project Example 1 Example 2 Example 3 Starting speed, s 18 20 23 Demolding time, s 240 250 270 Density, g / L 48 45 43 Tensile strength, kPa 12 11 11 Composting rate, %* 56 45 37 Wet water rebound time, S** 0.5 1 1

[0047] *: Test standard is ISO 14855, Determination of aerobic biodegradability and non-aggregate biodegradability of plastic materials under controlled compounding conditions. Carbon dioxide increment analysis method

[0048] **: Internal testing method, wet the foam completely, squeeze out the water in the foam, and test the rebound time of the wet foam after squeezing it flat.

Claims

1. A method for preparing a degradable hydrophilic polyurethane cosmetic powder puff, characterized in that: The following steps are involved: (1) Preparation of degradable hydrophilic polyols: ε-caprolactone, polyethylene glycol with a molecular weight of 600 and stannous octoate were added into a reactor equipped with a stirrer, a thermometer and a condenser in a molar ratio of 100:40:0.15, and reacted at 120°C for 4 hours to obtain caprolactone-PEG copolymer polyol, i.e., a degradable hydrophilic polyol, and the tested hydroxyl content was 110; (2) Preparation of polyurethane prepolymer component B: 360 g of toluene diisocyanate, 1000 g of caprolactone-PEG copolymer polyol, 3 g of trimethylolpropane, and 0.4 g of phosphoric acid. The caprolactone-PEG copolymer polyol, trimethylolpropane, and phosphoric acid are mixed and dehydrated, and then slowly added to the toluene diisocyanate in batches, and reacted at 85° C. for 2 h under nitrogen protection to obtain a polyurethane prepolymer component B with an NCO content of 6.4%; (3) The proportion of curing agent A component: 60 parts of water, 10 parts of wollastonite, 30 parts of corn starch, 2.5 parts of emulsifier, 2 parts of foaming agent, and 0.5 parts of color paste; (4) Preparation of biodegradable hydrophilic polyurethane cosmetic powder puff: Add the raw materials in the curing agent component A into a high-speed stirrer, mix evenly and adjust the temperature to 10°C to obtain a component A mixture; at the same time, preheat the polyurethane prepolymer component B to 30°C and preheat the mold to 40°C, keeping the temperature constant; The stirring speed was adjusted to 2000 rpm, and the polyurethane prepolymer B component was added to the A component mixture in a ratio of curing agent A component: polyurethane prepolymer B component = 1.2:1, stirred for 15 seconds, quickly poured into a mold for molding and aged for 10 hours to obtain a degradable hydrophilic polyurethane cosmetic puff; The biodegradable hydrophilic polyurethane cosmetic powder puff has a rising speed of 18s, a demoulding time of 240s, a density of 48g / L, a tensile strength of 12kPa, and a wet water rebound time of 0.5s.