Powerful anti-yellowing composition as well as preparation method and application thereof

Abstract

The invention relates to the technical field of antioxidant auxiliaries, and particularly discloses a powerful anti-yellowing composition as well as a preparation method and application thereof. The invention relates to a powerful anti-yellowing composition, which comprises the following components in parts by weight: 25 parts of hindered phenol antioxidant; 20 to 30 parts of a diphosphorus phosphite ester antioxidant; 20-30 parts of an ultraviolet weight absorbent; 15-25 parts of a hindered amine light stabilizer; and 4-6 parts of a light screening agent. The preparation method of the powerful anti-yellowing composition comprises the following steps: blending the components of the powerful anti-yellowing composition, heating until the components are molten after mixing, uniformly mixing, and cooling to obtain the powerful anti-yellowing composition. According to the powerful anti-yellowing composition, the specific antioxidant, the ultraviolet light absorber, the light stabilizer and the light screener are compounded, so that the powerful anti-yellowing composition has better anti-yellowing performance, can be prepared by blending in polyether, improves the anti-yellowing effect of underwear cotton, does not need to be added in batches for many times during use, and is convenient to use.

Description

Technical Field

[0001] The present application relates to the technical field of antioxidant adjuvants, and more specifically, to a strong anti-yellowing composition and a preparation method and application thereof. Background Art

[0002] Underwear sponge is one of the main raw materials for making women's underwear, and is a type of sponge with a relatively complex process. Since it is mainly used to make underwear close to the human body, it has strict requirements on environmental protection and quality.

[0003] Underwear cotton is mainly made of isocyanate and polyether, which are formed by foaming and hot pressing. Since isocyanate itself easily absorbs ultraviolet rays and oxygen, these groups easily generate chromophores such as quinone structures under light and other conditions, causing the product to yellow and age, and even degradation may occur under sunlight and hot pressing, which deteriorates the mechanical properties of the product.

[0004] At present, the problem of sponge yellowing is improved by adding heat pressing agents, ultraviolet absorbers and hindered amine light stabilizers to the raw materials, but the anti-yellowing effect is insufficient and serious yellowing phenomenon still exists. Summary of the invention

[0005] In order to reduce the yellowing phenomenon of underwear cotton, the present application provides a strong anti-yellowing composition and a preparation method and application thereof.

[0006] In the first aspect, the present application provides a strong anti-yellowing composition, which adopts the following technical solution: A strong anti-yellowing composition comprises the following components in parts by weight: 25 parts of hindered phenol antioxidant; 20-30 parts of bisphosphite antioxidant; 20-30 parts of ultraviolet absorber; 15-25 parts of hindered amine light stabilizer; 4-6 parts of light shielding agent.

[0007] By adopting the above technical solution: using hindered phenol antioxidant as the main antioxidant and bisphosphite antioxidant as the auxiliary antioxidant, the two have a certain synergistic effect to provide a basis for heat resistance and yellowing resistance, and bisphosphite antioxidant has a stronger ability to resist color change than monophosphorus. The ultraviolet absorber absorbs ultraviolet rays, and the hindered amine light stabilizer decomposes the free radicals produced by the degradation of underwear cotton due to the absorption of ultraviolet light, especially the compound light shielding agent plays a role in blocking ultraviolet rays. The joint action of the several significantly improves the anti-yellowing effect of underwear cotton, effectively improves the anti-ultraviolet and anti-color change capabilities of underwear cotton, and is conducive to the storage of underwear cotton after thermoforming.

[0008] Performance tests were carried out, and the average scores of the color fastness to gas smoke and ozone of the underwear cotton produced by adding a composition without light-shielding agent were 2.00 and 2.17 points respectively, while the color fastness of the underwear cotton produced by adding a composition containing a light-shielding agent was improved to 3.58 and 3.33 points or more respectively. That is, the composition containing a light-shielding agent can better improve the anti-yellowing effect of the underwear cotton.

[0009] Optionally, the composition comprises the following components in parts by weight: 25 parts of hindered phenol antioxidant; 25 parts of phosphite antioxidant; 25 parts of ultraviolet absorber; 20 parts of hindered amine light stabilizer; 5 parts of light shielding agent.

[0010] By adopting the above technical solution: when the components are compounded according to the above ratio, the prepared composition can be added into polyether to better improve the anti-yellowing performance of underwear cotton products.

[0011] Optionally, the hindered phenol antioxidant is a mixture of antioxidant 1315 and antioxidant 245; The bisphosphite antioxidant is antioxidant 508T; The ultraviolet absorber is ultraviolet absorber UV-1; The hindered phenol light stabilizer is light stabilizer 292.

[0012] By adopting the above technical solution: using antioxidants 1315 and 245 instead of conventional 1135 as the main antioxidant, and using them in combination with 508T, the thermal stability is better, which is conducive to the stability of polyurethane underwear cotton during high-temperature hot pressing, without yellowing or brittleness. The combination of ultraviolet absorber UV-1 and light stabilizer 292 has synergistic effects.

[0013] Optionally, the weight ratio of the antioxidant 1315 to the antioxidant 245 is 20:5.

[0014] Optionally, the light shielding agent is nano zinc oxide.

[0015] By adopting the above technical solution: when zinc oxide is irradiated with ultraviolet rays, the electrons on the valence band can absorb ultraviolet rays and be excited to the conduction band while generating hole-electron pairs, which have the function of absorbing ultraviolet rays; secondly, the nanoparticles can scatter the ultraviolet rays acting on them in all directions, reduce the intensity of ultraviolet rays in the irradiation direction, play a shielding effect, and at the same time improve the initial whiteness of the underwear cotton.

[0016] Optionally, the light shielding agent is modified nano zinc oxide, and the preparation method of the modified nano zinc oxide is: add hexadecyltrimethylammonium bromide and sodium hydroxide solution to zinc chloride solution, react, continue to add thiourea dioxide, keep warm and react, centrifuge, filter to remove the filtrate, and dry the precipitate to obtain.

[0017] By adopting the above technical solution: performance testing, when adding a composition containing nano zinc oxide, the two color fastness scores of underwear cotton are 3.75 and 3.58 points respectively, and when adding a composition containing modified nano zinc oxide, the two color fastness scores of underwear cotton are 4.33 and 4.17 points respectively. The difference between the two is that the modified nano zinc oxide contains both hexadecyl trimethyl ammonium bromide and thiourea dioxide, which make the modified nano zinc oxide better improve the anti-yellowing effect of underwear cotton. When only one of hexadecyl trimethyl ammonium bromide or thiourea dioxide is contained, the effect of improving the anti-yellowing performance of underwear cotton is insufficient, and the two color fastness scores are 3.83, 3.67 and 3.91, 3.75 respectively.

[0018] Optionally, the concentration of the zinc chloride solution is 0.8-1.2 mol / L; the molar ratio of the sodium hydroxide to the zinc chloride is 1.8-2.2:1; and the mass concentration of the hexadecyltrimethylammonium bromide is 5-7 g / L.

[0019] By adopting the above technical solution: when the parameters of the above mentioned factors are within the above mentioned ranges, the reaction is complete, the impurities are less, and the prepared modified nano zinc oxide effectively improves the anti-yellowing performance of underwear cotton.

[0020] Optionally, the weight-to-volume ratio of the added amount of the thiourea dioxide to the sodium hydroxide solution is 4-5.5 g:1 L.

[0021] By adopting the above technical solution: when the added amount of thiourea dioxide is within the above range, the prepared modified nano zinc oxide has the best anti-yellowing effect on underwear cotton.

[0022] In a second aspect, the present application provides a method for preparing a strong anti-yellowing composition, using the following technical scheme: A method for preparing a strong anti-yellowing composition, comprising the following steps: The components of the strong anti-yellowing composition are mixed, heated until the components are melted, and then cooled after mixing.

[0023] By adopting the above technical solution, the process is simple, and the anti-yellowing composition can be prepared by simple blending. When used, the composition can be directly blended into the polyether without secondary addition, and is easy to use.

[0024] In a third aspect, the present application provides an application of the above-mentioned strong anti-yellowing composition or the strong anti-yellowing composition prepared by the above-mentioned method added to polyether for preparing sponge.

[0025] In summary, this application has the following beneficial effects: 1. The present application adopts hindered phenol antioxidant as the main antioxidant and bisphosphite antioxidant as the auxiliary antioxidant to provide the anti-yellowing basis, and at the same time, a compound ultraviolet absorber is used to absorb ultraviolet rays, a hindered amine light stabilizer is used to decompose photolysis free radicals, and a compound light shielding agent is used to block ultraviolet rays. The compounding of the above ingredients effectively improves the anti-yellowing effect of underwear cotton. 2. The light shielding agent in the present application adopts self-made modified nano zinc oxide, and hexadecyltrimethylammonium bromide and thiourea dioxide are added in the preparation process, so that it can better improve the anti-yellowing effect compared with the unmodified one, and the whiteness of the underwear cotton produced is higher. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with the examples. The sources of the components are as follows, and the components other than those described below are commercially available: Hexadecyltrimethylammonium bromide was obtained from Shandong Tianshili Biotechnology Co., Ltd.; Thiourea dioxide, obtained from Zhengzhou Huixi Chemical Products Co., Ltd.; Antioxidant 1315, sourced from Foshan Huoliangduo Pigment Industrial Co., Ltd. Antioxidant 245, sourced from Dongguan Meida Plastic Raw Materials Co., Ltd.; Antioxidant 508T, sourced from Shandong Poly Chemical Co., Ltd.; Ultraviolet absorber UV-1 was obtained from Wuhan Huaxiang Kejie Biotechnology Co., Ltd.; Light stabilizer 292, brand BASF; Nano zinc oxide was purchased from Huzhou Mist New Materials Co., Ltd., model MST-Zn0-30TC.

[0027] Preparation Example 1 A modified nano zinc oxide is prepared by the following steps: Heat 0.5L of 0.8mol / L zinc chloride solution to 70°C and stir at 1000rpm, add 5g of hexadecyltrimethylammonium bromide, and dropwise add 0.5L of 1.44mol / L sodium hydroxide solution. After the addition is completed, continue to keep warm and stir for 10min, continue to add 1.5g of thiourea dioxide, continue to keep warm and react for 25min, centrifuge, filter to remove the filtrate, and dry the precipitate at 80°C for 12h.

[0028] Preparation Example 2 A modified nano zinc oxide is prepared by the following steps: Heat 0.5L of 1.0mol / L zinc chloride solution to 75°C and stir at 1000rpm, add 6g of hexadecyltrimethylammonium bromide, and dropwise add 0.5L of 2mol / L sodium hydroxide solution. After the addition is completed, continue to keep warm and stir for 10min, continue to add 1.5g of thiourea dioxide, continue to keep warm and react for 25min, centrifuge, filter to remove the filtrate, and dry the precipitate at 80°C for 12h.

[0029] Preparation Example 3 A modified nano zinc oxide is prepared by the following steps: Heat 0.5L of 1.2mol / L zinc chloride solution to 80°C and stir at 1000rpm, add 7g of hexadecyltrimethylammonium bromide, and dropwise add 0.5L of 2.64mol / L sodium hydroxide solution. After the addition is completed, continue to keep warm and stir for 10min, continue to add 1.5g of thiourea dioxide, continue to keep warm and react for 25min, centrifuge, filter to remove the filtrate, and dry the precipitate at 80°C for 12h.

[0030] Preparation Example 4-6 A modified nano zinc oxide, which differs from Preparation Example 2 in that the amount of thiourea dioxide added is different, as follows: In Preparation Example 4, the weight-to-volume ratio of the amount of thiourea dioxide added to the sodium hydroxide solution is 4g:1L.

[0031] In Preparation Example 5, the weight-to-volume ratio of the amount of thiourea dioxide added to the sodium hydroxide solution is 4.8 g:1 L.

[0032] In Preparation Example 6, the weight-to-volume ratio of the amount of thiourea dioxide added to the sodium hydroxide solution is 5.5 g:1 L.

[0033] Comparative Preparation Example 1 A modified nano zinc oxide, which is different from Preparation Example 2 in that thiourea dioxide is not added.

[0034] Comparative Preparation Example 2 A modified nano zinc oxide, which is different from Preparation Example 2 in that hexadecyltrimethylammonium bromide is not added.

[0035] Examples 1-3, Comparative Examples 1-2 A strong anti-yellowing composition, the components and their corresponding weights are shown in Table 1, and the composition is prepared by the following steps: the components of the strong anti-yellowing composition are blended, heated to 120° C. after mixing, stirred at 1000 rpm until mixed, and then cooled to room temperature.

[0036] Table 1 Components and their weights in Examples 1-3 and Comparative Examples 1-2 (kg) Examples 4-9, Comparative Example 3 A strong anti-yellowing composition, which is different from Example 2 in that an equal amount of modified nano zinc oxide is used instead of nano zinc oxide. The preparation example of modified nano zinc oxide is shown in Table 2.

[0037] Table 2 Usage of modified nano zinc oxide in Examples 4-9 and Comparative Examples 3-4 Example 4 5 6 7 8 9 Preparation example of modified nano zinc oxide 1 2 3 4 5 6 Comparative Example 3 4 \ \ \ \ Comparative preparation example of modified nano zinc oxide 1 2 \ \ \ \ Performance testing of the composition Each of the strong anti-yellowing compositions prepared in the examples and comparative examples is visually a colorless to slightly yellow liquid; each composition is tested according to GB / T 10247-2008, and the dynamic viscosity (25°C) is ≤5000mPa·s. Each composition has good fluidity and is easy to be added to polyether for use and to prepare underwear cotton.

[0038] Application Example 1-9, Comparative Application Example 1-4 The strong anti-yellowing composition in the embodiment and the comparative example was added to polyether 330N to prepare different underwear cottons. The addition amount of the composition was 3000 ppm. The usage of the composition is shown in the following table.

[0039] Table 3 Usage of the strong anti-yellowing composition in Application Examples 1-9 and Comparative Application Examples 1-4 Application Examples 1 2 3 4 5 6 7 8 9 Examples of strong anti-yellowing compositions 1 2 3 4 5 6 7 8 9 Comparative Application Examples 1 2 3 4 \ \ \ \ \ Comparative Example of Strong Anti-yellowing Composition 1 2 3 4 \ \ \ \ \ Performance testing of underwear cotton The underwear cotton prepared in the corresponding use case and comparative application example was subjected to the following performance tests, and the test results are recorded in Table 4.

[0040] Detection Methods 1. Color fastness to gas smoke: Test according to GB / T 11039.2-2005 "Textiles - Tests for color fastness - Color fastness to atmospheric pollutants - Part 2: Gas smoke", test for 8 hours, record the test grade. The average of the six grades of each underwear cotton is taken as the color fastness score to gas smoke of the underwear cotton, the higher the score, the better the anti-yellowing performance.

[0041] 2. Ozone color fastness: Ozone color fastness test is conducted according to AATCC 109-2011 "Ozone color fastness in low humidity atmosphere", with an ozone concentration of 4.5 mgtkg (mg / kg) and a test period of 1 cycle (4.5 hours). The average of the six grades of each underwear cotton is taken as the ozone color fastness score of the underwear cotton. The higher the score, the better the anti-yellowing performance.

[0042] Table 4 Performance test results Note: Since the average of the 6 sample grades is used, the score is rounded to two decimal places.

[0043] Referring to Table 4, the color fastness of the underwear cotton made after adding the anti-yellowing composition of Examples 1-3 to gas smoke is 3.58-3.75 points, and the color fastness to ozone is 3.33-3.58 points. In Comparative Example 1, compared with Example 2, no nano zinc oxide was added, and the two color fastness scores of the underwear cotton after testing were 2.00 points and 2.17 points respectively. The larger the score, the better the anti-yellowing effect of the composition. The above comparison shows that the underwear cotton after adding nano zinc oxide to the composition is not easy to yellow, and the excessive amount of nano zinc oxide has no positive effect on anti-yellowing.

[0044] The difference between Example 4-6 and Example 2 is that, by using the modified nano zinc oxide of Preparation Examples 1-3, the two color fastnesses of the underwear cotton are respectively improved to 4.25 and above 4, indicating that the addition of modified nano zinc oxide to the composition can better improve the anti-yellowing effect of the underwear cotton compared with nano zinc oxide, among which Example 5 is the best example.

[0045] The difference between modified nano zinc oxide and nano zinc oxide is that hexadecyl trimethyl ammonium bromide and thiourea dioxide are added in the preparation process of modified nano zinc oxide. Comparison of the above data shows that the modified nano zinc oxide after adding the two can better improve the anti-yellowing effect of underwear cotton. However, when thiourea dioxide (Comparative Example 3) and hexadecyl trimethyl ammonium bromide (Comparative Example 4) are not added in the preparation process of modified nano zinc oxide, the color fastness improvement effect of underwear cotton is insufficient.

[0046] The difference between Example 7-9 and Example 5 is that, during the preparation of the modified nano zinc oxide, the amount of thiourea dioxide added increases, and the two color fastnesses of the underwear cotton produced are improved, indicating that the amount of thiourea dioxide used should be within the range of Examples 7-9.

[0047] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A strong anti-yellowing composition, characterized in that: The composition comprises the following components in parts by weight: 25 parts of hindered phenol antioxidant; 20-30 parts of bisphosphite antioxidant; 20-30 parts of ultraviolet absorber; 15-25 parts of hindered amine light stabilizer; 4-6 parts of light shielding agent.

2. A strong anti-yellowing composition according to claim 1, characterized in that: The composition comprises the following components in parts by weight: 25 parts of hindered phenol antioxidant; 25 parts of phosphite antioxidant; 25 parts of ultraviolet absorber; 20 parts of hindered amine light stabilizer; 5 parts of light shielding agent.

3. A strong anti-yellowing composition according to claim 2, characterized in that: The hindered phenol antioxidant is a mixture of antioxidant 1315 and antioxidant 245; The bisphosphite antioxidant is antioxidant 508T; The ultraviolet absorber is ultraviolet absorber UV-1; The hindered phenol light stabilizer is light stabilizer 292.

4. A strong anti-yellowing composition according to claim 3, characterized in that: The weight ratio of the antioxidant 1315 to the antioxidant 245 is 20:

5.

5. The strong anti-yellowing composition according to claim 1, characterized in that: The light shielding agent is nano zinc oxide.

6. A strong anti-yellowing composition according to claim 1, characterized in that: The light shielding agent is modified nano zinc oxide, and the preparation method of the modified nano zinc oxide is: Add hexadecyltrimethylammonium bromide and sodium hydroxide solution to the zinc chloride solution, react, continue to add thiourea dioxide, keep warm and react, centrifuge, filter to remove the filtrate, and dry the precipitate to obtain the product.

7. A strong anti-yellowing composition according to claim 6, characterized in that: The concentration of the zinc chloride solution is 0.8-1.2 mol / L; the molar ratio of the sodium hydroxide to the zinc chloride is 1.8-2.2:1; and the mass concentration of the hexadecyltrimethylammonium bromide is 5-7 g / L.

8. A strong anti-yellowing composition according to claim 6, characterized in that: The weight-to-volume ratio of the added amount of the thiourea dioxide to the sodium hydroxide solution is 4-5.5 g:1 L.

9. A method for preparing the strong anti-yellowing composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: The components of the strong anti-yellowing composition are mixed, heated until the components are melted, and then cooled after mixing.

10. Use of the strong anti-yellowing composition as claimed in any one of claims 1 to 8 or the strong anti-yellowing composition prepared by the method according to claim 9 added to polyether for preparing sponge.

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