CN116270312A - Sun-proof stick and preparation method thereof - Google Patents

Abstract

The invention relates to a sun-proof stick which comprises the following components in parts by mass: 70-90 parts of a sunscreen component comprising an ultraviolet protection agent and an emollient; 3-20 parts of a wax comprising dibutyl ethyl hexanoyl glutamine, dibutyl lauroyl glutamine, and hydroxystearic acid; 0.1-5 parts of filler; 1-20 parts of film forming agent. The invention also relates to a preparation method of the sun protection stick.

Description

Sun-proof stick and preparation method thereof

Technical Field

The invention relates to the field of cosmetics, in particular to a sun-proof stick and a preparation method thereof, wherein the sun-proof stick can provide effective ultraviolet protection beneficial effects and can provide fresh, cool and non-greasy feel for skin.

Background

This section provides background information related to the present application, which does not necessarily constitute prior art.

Skin damage and skin diseases such as exfoliation and structural changes of the stratum corneum can be caused when the skin is exposed to excessive irradiation of sunlight, and skin aging can be accelerated when the skin is exposed to excessive and/or prolonged irradiation of sunlight. In order to prevent these skin diseases, cosmetics including an ultraviolet protective agent having an ultraviolet protective effect may be applied to the skin.

The existing cosmetic with sun protection care effect is usually in a milky or spray texture, and is contained in a packaging container, and is applied to skin in a mode of coating or spraying when in use. While cosmetics in solid form and having a sun care effect are called "sun bars", sun bars mainly include hydrocarbon waxes, fatty acid esters and oils, and the sun bars are used by rubbing the sun bars against the skin so that the uv protective agents of the sun bars having a uv protective effect adhere to the skin.

The existing sun-proof stick has the following technical problems:

1. when the sun-proof stick is smeared on the skin, the sun-proof substance is not stabilized, and when the human body sweats or produces oil, the effective sun-proof substance covered on the skin flows along with the sweat or the oil, so that sun-proof cavities are formed, the sun-proof effect is not obvious, or the actual sun-proof value is not reached;

2. because sun bars are used more frequently in the summer at high temperatures, consumers want to be able to obtain a fresh and cool feel after the sun bar is applied to the skin. However, because sun bars are often oil-based, it is often difficult to provide these fresh and cool sensations to the skin. In contrast, sun bars tend to impart a greasy feel to the skin;

3. another desire of consumers is to use sunscreen sticks that are easy to apply but do not create mess after use. For sunscreen sticks that are oil-based and/or contain a certain amount of metal oxide, the application of the stick to the skin may cause the hands and fingers to become greasy and/or leave a residue.

Based on the foregoing, there is a need for a sunscreen stick that provides excellent skin adhesion, effective uv protection benefits while leaving the skin fresh, cool and non-greasy, and yet is easy to apply and does not create messy after use.

None of the prior art provides all of the advantages and benefits of the present invention.

Disclosure of Invention

It is an object of the present invention to provide a sun bar which is smooth in extension, has good product strength and long duration of sun protection effect, which has excellent sun protection effect, and which leaves fresh, cool and non-greasy feel to the skin, which is easy to apply and which does not generate mess after use.

The sun-proof stick provided by the invention comprises the following components in parts by mass:

(a) About 70-90 parts of a sunscreen component comprising a uv protector and an emollient;

(b) About 3 to about 20 parts of a wax;

(c) About 0.1 to about 5 parts of a filler;

(d) About 1-20 parts of film forming agent.

Wherein the ultraviolet protective agent comprises at least one of ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, ethylhexyl triazone, homosalate, isoamyl p-methoxycinnamate, polysiloxane-15, butyl methoxydibenzoylmethane, hexyl diethylcarbamoylbenzoate and bis-ethylhexyl oxyphenol methoxyphenyl triazine.

Wherein the emollient comprises octyldodecanol, and the emollient further comprises at least one of caprylic/capric triglyceride, butylene glycol dicaprylate/dicaprate, triglyceride (ethylhexanoate), dibutyl adipate, mineral oil, diphenylsiloxyphenyl trimethicone, hydrogenated polydecene, and PEG/PPG-14/7 dimethyl ether.

Wherein the wax comprises dibutyl ethyl hexanoyl glutamine, dibutyl lauroyl glutamine and hydroxystearic acid.

Wherein the filler comprises at least one of silica, dimethylsilylated silica and silylated silica.

Wherein the film forming agent comprises at least one of trimethylsiloxysilicate, polymethylsilsesquioxane, VP/hexadecene copolymer, VP/eicosene copolymer, dextrin palmitate, stearoyl inulin, dextrin myristate and polypropylsilsesquioxane.

This meets the need for a sunscreen stick that provides effective UV protection benefits while leaving the skin fresh, cool, non-greasy feel, and producing these benefits even to consumers with oily skin. When the sun-proof stick is smeared on skin, a firm film with three-dimensional net structure can be formed, the film can firmly attach the ultraviolet protective agent on the surface of the skin, and the film can not sweat or flow along with the human body, so that the sun-proof effect lasts longer.

Another object of the present invention is to provide a method for preparing the above sunscreen stick. The preparation method comprises the following steps:

a step of pre-mixing an emollient and a wax and heating the mixture to form a liquid first mixture;

a step of mixing the ultraviolet protective agent with the first mixture and heating the mixture to form a liquid second mixture;

a step of mixing the filler, the film former and the second mixture and heating the mixture to form a third mixture;

and (3) filling the third mixture into a rod-shaped container, and then slowly cooling to form the sun-screening rod.

Wherein, the emollient is liquid at normal temperature and has the function of oily solvent.

The film forming agent also has the function of a binder, and the common function of the film forming agent and the wax ensures that the sun-proof stick can stably maintain a stick-shaped form in a wider temperature range.

These and other features, aspects, and advantages of the present invention will become apparent to those skilled in the art from a review of the present disclosure and appended claims.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The present invention is described in detail below in terms of its products and methods.

The sun-proof stick provided by the invention comprises the following components in parts by mass:

(a) About 70-90 parts of a sunscreen component comprising a uv protector and an emollient;

(b) About 3 to about 20 parts of a wax;

(c) About 0.1 to about 5 parts of a filler;

(d) About 1-20 parts of film forming agent.

Although the sunscreen stick of the present invention does not contain water, the sunscreen stick may provide improved fresh and cool feel to the skin based on the component collocation of the sunscreen stick.

[ ultraviolet protective agent ]

The present invention provides a sunscreen bar comprising a safe and effective amount of an ultraviolet protecting agent, two or more of which may be used, and preferably are used, to provide a broad spectrum of protection in the ultraviolet region. For example, at least one ultraviolet protecting agent that mainly provides UVA light protection and at least one ultraviolet protecting agent that mainly provides UVB light protection may be used.

These UV protectants useful in the sunscreen bar are preferably selected from ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, ethylhexyl triazone, homosalate, isoamyl p-methoxycinnamate, polysiloxane-15, butyl methoxydibenzoylmethane, hexyl diethylhydroxybenzoate, bis-ethylhexyl oxyphenol methoxyphenyl triazine, and mixtures thereof.

The exact amount of uv protectant used will depend on the sunscreen chosen and the desired Sun Protection Factor (SPF). SPF is a commonly used measure of photoprotection of sunscreens against erythema. Preferably, the sunscreen stick contains about 1 to 20 parts by mass of the UV protectant.

Uv protecting agents particularly suitable for use in the sunscreen bars of the present invention include a combination of ethylhexyl methoxycinnamate, ethylhexyl triazone, octocrylene, bis-ethylhexyl oxyphenol methoxyphenyl triazine, and hexyl diethylhydroxybenzoate, which combination absorbs strongly both in the UVB radiation range and in the UVA radiation range. The combination may provide higher efficacy, a broader ultraviolet absorption range, lower skin penetration, and longer efficacy relative to conventional uv protectants.

[ Filler ]

The sunscreen stick of the present invention includes an oil absorbing filler, and the filler useful in the sunscreen stick of the present invention is preferably selected from the group consisting of silica, dimethylsilylated silica, silylated silica, and mixtures thereof. The filler used in the sunscreen stick of the present invention has a grease absorbing ability. When the filler used comprises silica silylate, it has a grease absorption capacity of at least about 40ml/100g.

When the filler disclosed by the invention is in contact with other components of the sun-proof stick, the filler has lubricating property, so that the smoothness of the sun-proof stick in contact with skin can be obviously improved, the sun-proof stick added with the filler can better resist ultraviolet irradiation, thus the sun-proof effect is improved, the ultraviolet protection effect of the ultraviolet protective agent is not influenced by the addition of the filler, and the filler can be stably and uniformly dispersed in the sun-proof stick. After the sun-proof stick is coated on the skin, the filler can absorb grease on the surface of the skin, so that the sticky feel of the sun-proof stick to the skin is obviously reduced, and the fresh use feel of the sun-proof stick is endowed.

[ emollient ]

From the standpoint of providing the skin with an improved fresh, cool and non-greasy feel without necessarily imparting a dry feel to the skin, it is preferred that the emollient include at least diphenylsiloxyphenyl trimethicone, which is a volatile silicone oil. From the standpoint of providing skin moisturising benefits to the skin, it is preferred that the emollient also include non-volatile oils, particularly those useful in the sunscreen of the present invention are those having a relatively low viscosity which enhance freshness and shine when the sunscreen is applied to the skin, and the non-volatile oils useful in the sunscreen are preferably selected from the group consisting of caprylic/capric triglyceride, butylene glycol dicaprylate/dicaprate, tri (ethylhexanoate), dibutyl adipate, mineral oil, and mixtures thereof. From the standpoint of providing moisturization benefits to the skin, preferably, the emollient also includes hydrogenated polydecene and/or PEG/PPG-14/7 dimethyl ether. From the standpoint of improving the stability of the sunscreen stick, it is preferred that the emollient also include octyldodecanol.

The sunscreen sticks provided by the present invention may also include other non-volatile oils, non-volatile oils useful in the sunscreen according to the present invention are, for example, isotridecyl isononanoate, isostearyl isostearate, isocetyl isostearate, isopropyl isostearate, isodecyl isononanoate, cetyl octanoate, isononyl isononanoate, diisopropyl myristate, isocetyl myristate, isotridecyl myristate, isopropyl myristate, isostearyl palmitate, isocetyl palmitate, isodecyl palmitate, isopropyl palmitate, octyl palmitate, tri-2-ethylhexanoate, neopentyl glycol di (2-ethylhexanoate), tocopherol, tocopheryl acetate, avocado oil, tea oil, sea turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg oil, sesame oil, peach kernel oil, wheat germ oil, castor oil, linseed oil, soybean oil, tea seed oil, coconut oil, rice bran oil, china tung oil, japan oil, jojojoba oil, methyl-oil, caprylic acid, 3-ethyl-2-ethylhexanoate, liquid petrolatum, and mixtures thereof.

The emollients of the sunscreen stick provided herein are non-irritating, non-toxic or harmless when applied to the skin, and are compatible with the other components of the sunscreen stick and are chemically stable under normal use and storage conditions.

[ wax ]

To provide a solid sun bar, the thickener includes a wax. The composition and amount of wax is controlled to provide the desired hardness and strength to the product. Waxes useful in the present invention include dibutyl ethyl hexanoyl glutamine, dibutyl lauroyl glutamine, and hydroxystearic acid.

It has been unexpectedly found that the absence of either component of the wax, based on the sunscreen components of the sunscreen stick, affects the hardness and strength of the sunscreen stick, making the sunscreen stick susceptible to breakage due to insufficient hardness and strength.

[ film Forming agent ]

The film forming agent acts as a water resistance agent for obtaining a sun bar. These film formers are characterized by the following properties: if the film former is dissolved in a suitable solvent and then the solution is applied to the skin, a film is formed after evaporation of the solvent, which serves here primarily to fix the uv-protective agent to the skin and first of all to ensure or improve the water resistance of the film on the skin. The sun bar according to the invention has improved water resistance.

The water resistance of a sunscreen stick may be determined by the contact angle method on living human skin.

The SPF is determined after the following steps are performed: one time on dry skin and a second time after at least 2 x 20 minutes of washing and 15 minutes of drying. When the cleaned value minus the confidence interval is greater than 50% SPF static, water resistance is confirmed.

The water resistance of the sunscreen stick may also be tested ex vivo by the contact angle method. The contact angle is listed as an indicator of the water resistance for a cosmetic formulation. An angle of greater than 35 ° is set as an indicator for a water-resistant solution. The sunscreen stick according to the invention has a corresponding contact angle (contact angle method) of more than 35 °. Specifically, the contact angle of a sunscreen bar without film former is increased from about 25 ° to about 85 ° by the addition of film former.

The film forming agents useful in the sunscreen sticks of the present invention are preferably selected from the group consisting of trimethylsiloxysilicate, polymethylsilsesquioxane, VP/hexadecene copolymer, VP/eicosene copolymer, dextrin palmitate, stearoyl inulin, dextrin myristate, polypropylsilsesquioxane, and mixtures thereof. The sunscreen stick includes one or more film forming agents to further adjust the water resistance. When the sunscreen stick includes multiple uv protection agents, multiple film forming agents are used as necessary. It was unexpectedly found that the inclusion of at least VP/hexadecene copolymer and dextrin palmitate in the film former significantly improved the water resistance of the sunscreen stick.

[ auxiliary agent ]

The sunscreen sticks of the present invention may additionally include pigments that may be used in the present invention include color pigments and white pigments. The choice of pigment depends on the desired properties of the product, such as hue, coverage and various skin sensations.

Among the color pigments useful in the present invention are iron oxide, iron titanate, ultramarine blue, prussian blue, chromium oxide, chromium hydroxide, cobalt oxide, cobalt titanate, titanium oxide coated micas; organic powders such as ichthyogluanines, lake-colored tar-colored dyes and lake-colored natural colored dyes. These color pigments may be treated with a hydrophobic treatment agent comprising: silicones such as methyl silicone, polydimethylsiloxane and perfluoroalkyl silicone; fatty substances such as stearic acid; metal soaps such as aluminum dimyristoate; aluminum hydrogenated tallow glutamate, hydrogenated lecithin, lauroyl lysine, aluminum salts of perfluoroalkyl phosphates, and mixtures thereof.

White pigments other than uv protection grade may also be used, which have thickening properties. These pigments include titanium dioxide, zinc oxide, talc, mica, sericite, silica, magnesium silicate, synthetic fluorophlogopite), calcium silicate, aluminum silicate, bentonite and montmorillonite; pearlescent pigments such as aluminum oxide, barium sulfate, calcium phosphate dibasic, calcium carbonate, titanium oxide, finely divided titanium oxide, zirconium oxide, zinc oxide, hydroxyapatite and those mentioned above which are treated with a hydrophobic treatment agent.

The sunscreen stick of the present invention may additionally include antioxidants, preferably antioxidants including tocopheryl acetate and butylated hydroxytoluene, based on the emollient of the sunscreen stick.

[ method of use ]

The sun bar of the present invention is a solid. The sunscreen stick of the present invention provides effective UV protection benefits while providing a fresh, cool, non-greasy feel to the skin, even to consumers with oily skin. The sun-proof stick is suitable for sun-proof products used daily, and can be directly coated on skin without hands or fingers. Thus, a sunscreen stick which is easy to apply and which does not cause mess after use can be obtained. In addition, such a package is suitable for carrying by the consumer.

Examples (example)

The specific compositional parameters for the sunscreen sticks provided in examples 1-3 are shown in Table 1.

The preparation methods of the sun bars provided in examples 1-3 all include the following steps:

step one, all the raw materials of the component B phase are liquid, and the component A and the component B are mixed in an emulsifying pot at normal temperature and then heated to 90-100 ℃ until a clear and transparent liquid state is formed, so that a first mixture is obtained;

step two, adding the component C into an emulsifying pot, mixing with the first mixture, maintaining the temperature of 80-85 ℃ and continuously stirring until a liquid second mixture is formed;

step three, adding the component D and the component E into an emulsifying pot, and uniformly mixing the liquid second mixture, the component D and the component E by using a homogenizer to obtain a third mixture;

and fourthly, regulating the temperature of the third mixture to 70 ℃, filling the third mixture into a rod-shaped container, and cooling the rod-shaped container to room temperature by using cooling equipment to obtain the solid sun-proof rod.

The sunscreen sticks provided in examples 1-3 provide effective UV protection benefits while leaving the skin fresh, cool, non-greasy feel, and these benefits can be produced even for consumers with oily skin.

TABLE 1

Specific component parameters of the sunscreen sticks provided in comparative examples 1-7 are shown in Table 2.

The sunscreen stick provided in comparative example 8 differs from the sunscreen stick provided in example 3 only in that: comparative example 8 provides a sunscreen bar that does not contain VP/hexadecene copolymer and dextrin palmitate.

The preparation method of the sun-protection sticks provided in comparative examples 1-8 was the same as that provided in example 3.

The sun bars provided in examples 1-3 were subjected to sun index testing and safety testing.

[ Sun-protection index test ]

The sunscreen sticks provided in examples 1-3 were tested according to the specific requirements of the sun protection index test in cosmetic safety Specification (2015 edition), 10 healthy volunteers (5 men and women each) with ages distributed between 23 and 58 years were selected to participate, the light source was a solar simulator xenon arc lamp, and the standard control samples were respectively SPF value 16.10.+ -. 2.40 and PFA value 4.40.+ -. 2.40, with specific test results: examples 1-3 provide sunscreen sticks having SPF values greater than 5, consistent with the claimed and actual sunscreen requirements.

[ safety test ]

The sunscreen sticks provided in examples 1-3 were each subjected to a 48 hour human skin closure test. 30 healthy volunteers with ages of 20-59 years are selected, 0.020-0.025g of samples are respectively placed in a plaque tester, a special adhesive tape is externally applied to the back of the volunteers, the plaque tester is removed after 24 hours, the samples are wiped, the skin reactions of the volunteers are respectively observed at 0.5, 24 and 48 hours, and the results are recorded according to the skin reaction grading standard in the cosmetic safety technical Specification (2015 edition), wherein the specific test results are as follows: the sunscreen sticks provided in examples 1-3 do not have adverse skin reactions in human skin patch tests, demonstrating that the preparation of the sunscreen sticks according to the present invention does not cause irritation to the skin.

TABLE 2

The sunscreen sticks provided in examples 1-3 and the sunscreen sticks provided in comparative examples 1-4 were subjected to stability testing, needle penetration hardness testing, and strength testing.

[ stability test ]

The sunscreen bar samples were placed in an incubator at-15 deg.c, 37 deg.c, 45 deg.c for 2 months, respectively, and the properties of the sunscreen bars were checked at 30 days, 60 days. The specific test results are: the sunscreen bars provided in examples 1-3 were placed in the thermostats at-15 deg.c, 37 deg.c and 45 deg.c for 2 months without any abnormality (solid bar shape was maintained, and no abnormalities such as sweating, cracking, skewing, etc.), the sunscreen bars provided in comparative examples 1-3 were placed in the thermostats at 37 deg.c for 2 months without any abnormality, the sunscreen bars provided in comparative examples 1-3 were placed in the thermostats at-15 deg.c and 45 deg.c for 2 months with any abnormality, and the sunscreen bars provided in example 4 were placed in the thermostats at-15 deg.c, 37 deg.c and 45 deg.c for 2 months with any abnormality.

[ needle penetration hardness test ]

The measurement conditions of the needle penetration hardness are as follows: a sample of the sunscreen stick stored at 25℃was measured at a needle diameter of 1mm and a needle penetration depth of 3mm and a rising speed of 2 cm/min. The penetration hardness is expressed by the maximum value of the stress value (force applied to the needle) at the measured penetration depth of 0 to 3mm

Hardness of the sunscreen stick samples was measured as follows: under the above hardness measurement conditions, a cylindrical needle was inserted in the vertical direction (direction perpendicular to the cutting plane) on the central axis of the cut surface, and the measurements were performed on the distal end portion, the middle portion, and the bottom end portion of the sunscreen bar sample, respectively. The "tip portion" is a position 10mm from the topmost end of the sunscreen stick sample in a direction from the topmost end toward the middle portion, the "base portion" is a position 10mm from the bottommost end of the sunscreen stick sample in a direction from the bottommost end toward the middle portion, and the "middle portion" is a position 1/2 of the distance from the top end of the sunscreen stick sample from the base portion.

The specific test results are: the hardness of the top end portion, the hardness of the middle portion, and the hardness of the bottom end portion of the sunscreen stick provided in examples 1-3 were all 0.40N; the hardness of the tip end portion, the hardness of the intermediate portion, and the hardness of the bottom end portion of the sun block bar provided in comparative example 4 were all 0.18N; the hardness of the tip portion, the hardness of the intermediate portion, and the hardness of the bottom portion of the sun block bar provided in comparative examples 1 to 3 were all in the range of 0.25 to 0.30N.

[ Strength test ]

The breakage of the sunscreen bar samples stored at 25℃at the time of actual use was evaluated by 20 panelists. The specific test results are: none of the sunscreen sticks provided in examples 1-3 failed to break, 1-4 of the 20 people provided in comparative examples 1-3 failed, and 11 of the 20 people provided in comparative example 4 failed.

The sunscreen sticks provided in examples 1-3 and the sunscreen sticks provided in comparative examples 5-8 were tested for water resistance.

[ Water resistance test ]

The coated film was prepared by rubbing a sample of a sun block bar onto a glass slide and then drying at 25 ℃ for 2 hours. The contact angle after 30 seconds from the dropping of 0.1. Mu.L of the water drop onto the coating film was measured by an automatic contact angle meter DCA-VZ. The specific test results are: the water contact angles for the sunscreen sticks provided in examples 1-3 were 85 °, 84 °, and 85 °, respectively, the water contact angles for the sunscreen sticks provided in comparative examples 5-7 were 60 °, 55 °, and 48 °, respectively, and the water contact angle for the sunscreen sticks provided in comparative example 8 was 18 °.

It was determined that the films obtained from the sunscreen sticks of examples 1 to 3 were excellent in water resistance and provided good water resistance relative to the sunscreen sticks of comparative examples 5 to 8, thereby effectively improving the duration of the sunscreen effect. In addition, it is evident from the comparison of examples 1-3 with comparative examples 5-8 that the desired water resistance of the sunscreen bars can be imparted by the addition of specific film formers.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. The sun-proof stick is characterized by comprising the following components in parts by mass:

70-90 parts of a sunscreen component comprising an ultraviolet protection agent and an emollient;

3-20 parts of a wax comprising dibutyl ethyl hexanoyl glutamine, dibutyl lauroyl glutamine, and hydroxystearic acid;

0.1-5 parts of filler;

1-20 parts of film forming agent.

2. The sun bar of claim 1, wherein the uv protectant comprises at least one of ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, ethylhexyl triazone, homosalate, isopentyl p-methoxycinnamate, polysiloxane-15, butylmethoxydibenzoylmethane, hexyl diethylhydroxybenzoate, and bis-ethylhexyloxyphenol methoxyphenyl triazine.

3. The sun bar of claim 2 wherein said emollient comprises octyldodecanol and further comprising at least one of caprylic/capric triglyceride, butylene glycol dicaprylate/dicaprate, tri (ethylhexanoate), dibutyl adipate, mineral oil, diphenylsiloxyphenyl trimethicone, hydrogenated polydecene, PEG/PPG-14/7 dimethyl ether.

4. The sun bar of claim 3 wherein said filler comprises at least one of silica, dimethyl silyl silica and silyl silica.

5. The sunbar of claim 4, wherein said film forming agent comprises at least one of trimethylsiloxysilicate, polymethylsilsesquioxane, VP/hexadecene copolymer, VP/eicosene copolymer, dextrin palmitate, stearoyl inulin, dextrin myristate, and polypropylsilsesquioxane.

6. The sunbar of claim 5, wherein said uv protectant comprises a combination of ethylhexyl methoxycinnamate, ethylhexyl triazone, octocrylene, bis-ethylhexyl oxyphenol methoxyphenyl triazine, and hexyl diethylhydroxybenzoate.

7. The sun bar of claim 6 wherein said emollient comprises a combination of octyldodecanol, hydrogenated polydecene, diphenylsiloxyphenyl trimethicone, dibutyl adipate, mineral oil, and PEG/PPG-14/7 dimethyl ether.

8. The sunscreen bar according to claim 7, wherein the film former comprises a combination of VP/hexadecene copolymer and dextrin palmitate.

9. The sun bar of claim 8 further comprising tocopheryl acetate and butylated hydroxytoluene.

10. A method of preparing a sunscreen stick according to any of claims 1 to 9, comprising the steps of:

a step of pre-mixing an emollient and a wax and heating the mixture to form a liquid first mixture;

a step of mixing the ultraviolet protective agent with the first mixture and heating the mixture to form a liquid second mixture;

a step of mixing the filler, the film former and the second mixture and heating the mixture to form a third mixture;

and (3) filling the third mixture into a rod-shaped container, and then slowly cooling to form the sun-screening rod.