阅读说明：本技术 一种抗发白助剂及其应用方法 (Anti-blushing auxiliary agent and application method thereof ) 是由 邹旭东 李庆蛟 于 2020-12-31 设计创作，主要内容包括：本发明涉及复合材料技术领域,特别涉及一种抗发白助剂及其应用方法。其技术要点如下：按照重量份数计算,抗发白助剂包括如下组分：乙烯-共聚物5～8份,金属氮化物2～5份和铂族金属化合物2～5份。本发明开发的一种抗发白助剂及其应用方法,很好地提高材料的力学性能、耐热性、尺寸稳定性、韧性、耐刮擦性等综合性能。(The invention relates to the technical field of composite materials, and particularly relates to an anti-blushing auxiliary agent and an application method thereof. The technical points are as follows: the anti-blushing auxiliary agent comprises the following components in parts by weight: 5-8 parts of ethylene-copolymer, 2-5 parts of metal nitride and 2-5 parts of platinum group metal compound. The anti-blushing auxiliary agent and the application method thereof developed by the invention can well improve the comprehensive properties of the material, such as mechanical property, heat resistance, dimensional stability, toughness, scratch resistance and the like.)

1. The anti-blushing auxiliary agent is characterized by comprising the following components in parts by weight: 5-8 parts of ethylene-copolymer, 2-5 parts of metal nitride and 2-5 parts of platinum group metal compound.

2. The anti-blushing additive as claimed in claim 1, wherein said platinum group metal compound is any one of sodium hexachloroplatinate, sodium hexachlororhodate or sodium hexachlororuthenate.

3. The anti-blushing additive according to claim 1 or 2, wherein said metal nitride is any one or a mixture of two of gallium nitride or tantalum nitride.

4. The application method of the whitening-resistant auxiliary agent as claimed in claim 1, wherein the whitening-resistant auxiliary agent is used in case injection molding materials, and the case injection molding materials comprise the following components in parts by weight: 40-80 parts of polypropylene resin, 5-10 parts of an antibacterial agent, 5-8 parts of a toughening agent, 5-20 parts of an anti-whitening auxiliary agent, 1-2 parts of a processing auxiliary agent and 1-2 parts of a color auxiliary agent.

5. The method for applying the anti-blushing additive according to claim 4, wherein the antibacterial agent is AgPt intercalated hydrotalcite.

6. The method for applying the anti-blushing additive according to claim 4, wherein the AgPt intercalated hydrotalcite is Pt_xAg_y/MgAl-LDHs, wherein x =1 or 2; y =2, 3 or 4.

7. The method of claim 4, wherein the toughening agent is an acrylate core-shell impact modifier and silicone impact modifier composite.

8. The method for applying the anti-blushing additive according to claim 4, wherein the processing additive is a modified polytetrafluoroethylene resin or a modified polyurethane resin.

9. The method of claim 4, wherein the color-improving agent is any one of a pigment and a dye.

10. The application method of the anti-blushing auxiliary agent as claimed in claim 4, characterized by comprising the following specific operation steps:

s1, weighing 40-80 parts of polypropylene resin, 5-10 parts of an antibacterial agent, 5-8 parts of a toughening agent, 5-20 parts of an anti-whitening auxiliary agent, 1-2 parts of a processing auxiliary agent and 1-2 parts of a color auxiliary agent as raw materials in parts by weight;

s2, adding the toughening agent into a high-speed mixer, adding the processing aid into the mixer under high-speed stirring, mixing with the toughening agent, and cooling to room temperature to obtain a mixture A for later use;

s3, sequentially adding the polypropylene resin, the antibacterial agent, the anti-blushing auxiliary agent, the mixture A and the color auxiliary agent, and then uniformly mixing under a high-speed stirring condition to obtain a mixed material B;

and S4, adding the mixed material B into a double-screw extruder, extruding the mixed material into a strip-shaped article by using the extruder, and performing cold cutting to obtain master batches to obtain the case injection molding material.

Technical Field

The invention relates to the technical field of composite materials, and particularly relates to an anti-blushing auxiliary agent and an application method thereof.

Background

To the people of travelling or business trip, travel bag is a light swift instrument, can provide multiple and accomodate supplementary, alleviates the journey tired, consequently possess extensive market space. Especially, the traveling case with beautiful appearance, multiple colors, light weight and excellent price is favored by consumers.

The traditional luggage is made of PC or ABS materials, sheets are formed through extrusion, after appearance coating, a plastic suction process is used for forming a fixed shape, and then assembly is carried out. The luggage made of the material and the process has heavier weight and higher price due to the fact that the selected materials are the same. The newly-appeared luggage is made of polypropylene materials, so that the luggage with low price and light weight can be obtained. However, in the transportation process of the conventional case made of polypropylene, due to external force factors such as external collision and bumping, the appearance of the product is easy to have abnormal appearance of stress white marks, which affects the appearance, and the case serving as the most common travel storage tool can contact various environments in the use process, is easy to be infected with bacteria and the like, and causes disease transmission.

In view of the defects of the existing injection molding polypropylene composite material, the inventor develops an anti-whitening auxiliary agent and an application method thereof by matching theoretical analysis and research innovation based on years of abundant experience and professional knowledge of the material, and well improves the comprehensive properties of the material, such as mechanical property, heat resistance, dimensional stability, toughness, scratch resistance and the like.

Disclosure of Invention

The first purpose of the invention is to provide an anti-blushing auxiliary agent, which can obviously improve the blushing resistance and the antibacterial property of a polypropylene composite material for luggage injection molding, and simultaneously improve the flame retardant effect and the impact resistance.

The technical purpose of the invention is realized by the following technical scheme:

the invention provides an anti-blushing auxiliary agent which comprises the following components in parts by weight: 5-8 parts of ethylene-copolymer, 2-5 parts of metal nitride and 2-5 parts of platinum group metal compound.

The nitride generated by directly combining transition element and nitrogen is called metal nitride, they belong to "interstitial compound", the nitrogen element occupies the gap in the metal lattice, and has the advantages of high melting point and high corrosion resistance, after it is mixed into ethylene-copolymer, the metal nitride particles are inserted into the network space formed by ethylene copolymer, plays a role in supporting the network, improves the strength and the scratch resistance of the ethylene-copolymer, is applied to acrylic resin as an anti-whitening auxiliary agent, the metal nitride is embedded in the space network of the disordered crosslinking of the ethylene-copolymer and the acrylic resin through the crosslinking action of the ethylene-copolymer and the acrylic resin, the conduction of stress is prevented, the problem that the polypropylene material is stressed to generate silver lines is solved in a microscopic mode, and the white hair resistance of the material is improved.

Further, the platinum group metal compound is any one of sodium hexachloroplatinate, sodium hexachlororhodate or sodium hexachlororuthenate.

The platinum group metal compound has special dielectric constant and special electromagnetic property, and can weaken the light refraction effect of cracks by forming dispersion phenomenon through refraction and scattering of light, thereby improving the whitening resistance of the luggage.

Further, the metal nitride is any one of gallium nitride or tantalum nitride or a mixture of the two. Gallium nitride and tantalum nitride have special valence electronic structures and direct wide band gaps, after the luggage material is scraped, gallium nitride or tantalum nitride in the space network of acrylic resin disordered cross-linking is photonic crystal, the Bragg scattering mechanism of electromagnetic waves in the periodic structure plays a main role, and under the condition that the incident light is not damaged, the propagation direction of the incident light is changed, so that the light can be reflected for multiple times in the gallium nitride or tantalum nitride crystal, the effect of reflected light of the cracks is weakened, and the whitening effect of the luggage material is weakened.

It is another object of the present invention to provide a method for applying an anti-blushing auxiliary, which has the same effect.

The technical effects of the invention are realized by the following technical scheme:

the invention provides an application method of an anti-whitening auxiliary agent, which is characterized in that the anti-whitening auxiliary agent is used in a case injection molding material, and the case injection molding material comprises the following components in parts by weight: 40-80 parts of polypropylene resin, 5-10 parts of an antibacterial agent, 5-8 parts of a toughening agent, 5-20 parts of an anti-whitening auxiliary agent, 1-2 parts of a processing auxiliary agent and 1-2 parts of a color auxiliary agent.

Further, the antibacterial agent is AgPt intercalated hydrotalcite.

Further, the AgPt intercalated hydrotalcite is Pt_xAg_y(ii)/MgAl-LDHs, wherein x is 1 or 2; y is 2, 3 or 4. The preparation method comprises: weighing a certain amount of K₂PtCl₄And silver lignosulfonate sol in deionized water to obtain sol with n (Pt) 1 to (0.3-2). Simultaneously adding the powder into a beaker weighed with 0.50g of magnesium-aluminum hydrotalcite, continuously stirring for 5 hours in a constant-temperature water bath kettle at the temperature of 80 ℃, filtering, washing for 3-5 times by using deionized water, and drying for 8 hours at the temperature of 60 ℃ to obtain Pt_xAg_yA MgAl-LDH catalyst. The silver lignosulfonate sol is used as an Ag source, lignosulfonate can be introduced into the intercalation, the specific surface area of the intercalation is enlarged, and the smoke suppression performance of the intercalation is improved.

Furthermore, the toughening agent is a compound of an acrylate core-shell type impact modifier and a silicone impact modifier. The silicon-based flexibilizer has a toughening effect and a synergistic effect with an intercalation material in the antibacterial agent, forms a carbon protective layer on the surface of the material and generates a free radical capture active intermediate, which is equivalent to a carbon-type smoke suppressant.

Further, the processing aid is modified polytetrafluoroethylene resin or modified polyurethane resin.

Further, the color auxiliary agent is any one of a pigment or a dye.

The invention provides a preparation method of an anti-blushing and antibacterial polypropylene composite material for case injection molding, which comprises the following specific operation steps:

s1, weighing 40-80 parts of polypropylene resin, 5-10 parts of an antibacterial agent, 5-8 parts of a toughening agent, 5-20 parts of an anti-whitening auxiliary agent, 1-2 parts of a processing auxiliary agent and 1-2 parts of a color auxiliary agent as raw materials in parts by weight;

s2, adding a toughening agent into a high-speed mixer, adding a processing aid into the mixer under high-speed stirring, mixing with the toughening agent, and cooling to room temperature to obtain a mixture A for later use; the toughening agent and the processing aid are mixed in advance, and a more compact carbon layer is formed by crosslinking polytetrafluoroethylene and acrylate in the processing aid, so that the flame retardance and smoke suppression performance of the composite material are further improved.

S3, sequentially adding the polypropylene resin, the antibacterial agent, the anti-blushing auxiliary agent, the mixture A and the color auxiliary agent, and then uniformly mixing under a high-speed stirring condition to obtain a mixed material B;

and S4, adding the mixed material B into a double-screw extruder, extruding the mixed material into strip-shaped articles by using the extruder, and performing cold cutting to obtain master batches to obtain the polypropylene composite material.

Preferably, in the preparation method of the whitening-resistant and antibacterial polypropylene composite material for case injection molding, the mixing temperature is controlled to be 80-90 ℃ in step S2.

Preferably, in the preparation method of the whitening-resistant and antibacterial polypropylene composite material for case injection molding provided by the invention, the parameters of each section of the double-screw machine are set as follows: the temperature of the first zone is 30 ℃, the temperature of the second zone is 250-. The temperature of the first zone is normal temperature, so that the material is quickly conveyed into the screw rod, and the material accumulation at the feed opening is avoided. The two and three zones are set according to the melting temperature of the material. The back section is a dispersing, distributing and conveying section, and the temperature is reduced by 10 ℃ to avoid yellowing and degradation caused by high temperature for a long time.

In conclusion, the invention has the following beneficial effects:

according to the whitening-resistant auxiliary agent and the application method thereof provided by the invention, the nitride and the platinum group metal compound are added in the crosslinking of the polypropylene resin and the ethylene-copolymer, so that the whitening resistance of the composite material is improved in two aspects of preventing stress conduction and reducing refractive index change, and the antibacterial performance of the luggage material is improved by adding the antibacterial agent.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the detailed description of the anti-blushing additive and the application method thereof according to the present invention are provided below.

Example 1: anti-blushing auxiliary agent and application method thereof

An anti-blushing auxiliary agent comprises the following components: 5-8 parts of ethylene-copolymer, 2-5 parts of metal nitride and 2-5 parts of platinum group metal compound.

The preparation method of the anti-whitening auxiliary agent in the embodiment is to use the anti-whitening auxiliary agent in the case injection molding material, wherein the case injection molding material comprises the following components in parts by weight: 40-80 parts of polypropylene resin, 5-10 parts of an antibacterial agent, 5-8 parts of a toughening agent, 5-20 parts of an anti-whitening auxiliary agent, 1-2 parts of a processing auxiliary agent and 1-2 parts of a color auxiliary agent; the anti-blushing auxiliary comprises the following components: 5-8 parts of ethylene-copolymer, 2-5 parts of metal nitride and 2-5 parts of platinum group metal compound.

The preparation method of the case injection molding material comprises the following steps:

the method specifically comprises the following operation steps:

s1, weighing 40-80 parts of polypropylene resin, 5-10 parts of an antibacterial agent, 5-8 parts of a toughening agent, 5-20 parts of an anti-whitening auxiliary agent, 1-2 parts of a processing auxiliary agent and 1-2 parts of a color auxiliary agent as raw materials in parts by weight;

s2, adding a toughening agent into a high-speed mixer, adding a processing aid into the mixer under high-speed stirring, mixing with the toughening agent, and cooling to room temperature to obtain a mixture A for later use;

s3, sequentially adding the polypropylene resin, the antibacterial agent, the anti-blushing auxiliary agent, the mixture A and the color auxiliary agent, and then uniformly mixing under a high-speed stirring condition to obtain a mixed material B;

and S4, adding the mixed material B into a double-screw extruder, extruding the mixed material into strip-shaped articles by using the extruder, and performing cold cutting to obtain master batches to obtain the polypropylene composite material.

The invention provides a preparation method of an anti-blushing and antibacterial polypropylene composite material for case injection molding, which comprises the following steps of: the temperature of the first zone is 30 ℃, the temperature of the second zone is 250-. The temperature of the first zone is normal temperature, so that the material is quickly conveyed into the screw rod, and the material accumulation at the feed opening is avoided.

Example 2: anti-blushing auxiliary agent and application method thereof

An anti-blushing auxiliary agent comprises the following components: 8 parts of ethylene-copolymer, 5 parts of metal nitride and 5 parts of platinum group metal compound.

The preparation method of the anti-whitening auxiliary agent in the embodiment is to use the anti-whitening auxiliary agent in the case injection molding material, wherein the case injection molding material comprises the following components in parts by weight: 80 parts of polypropylene resin, 10 parts of an antibacterial agent, 8 parts of an acrylate core-shell type impact modifier and organosilicon impact modifier compound, 20 parts of an anti-blushing auxiliary agent, 2 parts of a processing auxiliary agent and 2 parts of a color auxiliary agent; the anti-blushing auxiliary agent comprises the following components: 8 parts of ethylene-copolymer, 5 parts of metal nitride and 5 parts of sodium hexachloroplatinate.

The preparation method of the case injection molding material comprises the following steps:

the method specifically comprises the following operation steps:

s1, weighing 80 parts of polypropylene resin, 10 parts of an antibacterial agent, 8 parts of an acrylate core-shell type impact modifier and organosilicon impact modifier compound, 20 parts of an anti-blushing auxiliary agent, 2 parts of a processing auxiliary agent and 2 parts of a color auxiliary agent as raw materials in parts by weight;

s2, adding a toughening agent into a high-speed mixer, adding a processing aid into the mixer under high-speed stirring, mixing with the toughening agent, and cooling to room temperature to obtain a mixture A for later use;

s3, sequentially adding the polypropylene resin, the antibacterial agent, the anti-blushing auxiliary agent, the mixture A and the color auxiliary agent, and then uniformly mixing under a high-speed stirring condition to obtain a mixed material B;

and S4, adding the mixed material B into a double-screw extruder, extruding the mixed material into strip-shaped articles by using the extruder, and performing cold cutting to obtain master batches to obtain the polypropylene composite material.

The invention provides a preparation method of an anti-blushing and antibacterial polypropylene composite material for case injection molding, which comprises the following steps of: the temperature of the first zone is 30 ℃, the temperature of the second zone is 250-. The temperature of the first zone is normal temperature, so that the material is quickly conveyed into the screw rod, and the material accumulation at the feed opening is avoided.

Example 3: anti-blushing auxiliary agent and application method thereof

An anti-blushing auxiliary agent comprises the following components: 8 parts of ethylene-copolymer, 2 parts of metal nitride and 5 parts of platinum group metal compound.

The preparation method of the anti-whitening auxiliary agent in the embodiment is to use the anti-whitening auxiliary agent in the case injection molding material, wherein the case injection molding material comprises the following components in parts by weight: 40 parts of polypropylene resin, Pt₂Ag₂5 parts of/MgAl-LDHs, 5 parts of acrylate core-shell impact modifier and organosilicon impact modifier compound, 5 parts of anti-blushing auxiliary agent, 1 part of processing auxiliary agent and 1 part of color auxiliary agent; the anti-blushing auxiliary agent comprises the following components: 5 parts of ethylene-copolymer, 2 parts of gallium nitride and 2 parts of sodium hexachlororhodate.

The preparation method of the case injection molding material comprises the following steps:

the method specifically comprises the following operation steps:

s1, weighing 40 parts of polypropylene resin and Pt in parts by weight₂Ag₂5 parts of/MgAl-LDHs, 5 parts of acrylate core-shell impact modifier and organosilicon impact modifier compound, 5 parts of anti-blushing auxiliary agent, 1 part of processing auxiliary agent and 1 part of color auxiliary agent as raw materials;

s2, adding the acrylate core-shell type impact modifier and the organic silicon impact modifier compound into a high-speed mixer, adding the processing aid into the mixer under high-speed stirring, mixing with the acrylate core-shell type impact modifier and the organic silicon impact modifier compound, and cooling to room temperature to obtain a mixture A for later use;

s3, sequentially adding the polypropylene resin, the antibacterial agent, the anti-blushing auxiliary agent, the mixture A and the color auxiliary agent, and then uniformly mixing under a high-speed stirring condition to obtain a mixed material B;

and S4, adding the mixed material B into a double-screw extruder, extruding the mixed material into strip-shaped articles by using the extruder, and performing cold cutting to obtain master batches to obtain the polypropylene composite material.

The invention provides a preparation method of an anti-blushing and antibacterial polypropylene composite material for case injection molding, which comprises the following steps of: the temperature of the first zone is 30 ℃, the temperature of the second zone is 250-. The temperature of the first zone is normal temperature, so that the material is quickly conveyed into the screw rod, and the material accumulation at the feed opening is avoided.

Pt₂Ag₂The preparation method of the/MgAl-LDHs comprises the following steps: weigh 0.40g K₂PtCl₄And proper amount of silver lignosulfonate sol are dissolved in deionized water to obtain solution with n (Pt) and n (Ag) in the ratio of 1 to 0.5. Simultaneously adding the powder into a beaker weighed with 0.50g of magnesium-aluminum hydrotalcite, continuously stirring for 5 hours in a constant-temperature water bath kettle at the temperature of 80 ℃, filtering, washing for 3-5 times by using deionized water, and drying for 8 hours at the temperature of 60 ℃ to obtain Pt₂Ag₂/MgAl-LDHs。

Example 4: anti-blushing auxiliary agent and application method thereof

An anti-blushing auxiliary agent comprises the following components: 5 parts of ethylene-copolymer, 2 parts of metal nitride and 2 parts of platinum group metal compound.

The preparation method of the anti-whitening auxiliary agent in the embodiment is to use the anti-whitening auxiliary agent in the case injection molding material, wherein the case injection molding material comprises the following components in parts by weight: 60 parts of polypropylene resin, Pt₂Ag₄8 parts of/MgAl-LDHs, 6 parts of acrylate core-shell impact modifier and organosilicon impact modifier compound, 15 parts of anti-blushing auxiliary agent, 1 part of processing auxiliary agent and 1 part of color auxiliary agent; the anti-blushing auxiliary agent comprises the following components: 5 parts of ethylene-copolymer, 2 parts of tantalum nitride and 2 parts of sodium hexachlororuthenate.

The preparation method of the case injection molding material comprises the following steps:

the method specifically comprises the following operation steps:

s1, weighing 60 parts of polypropylene resin and Pt in parts by weight₂Ag₄8 parts of/MgAl-LDHs and acrylate core-shell type impact modifier6 parts of organic silicon impact modifier compound, 15 parts of anti-blushing auxiliary agent, 1 part of processing auxiliary agent and 1 part of color auxiliary agent are taken as raw materials;

s2, adding the acrylate core-shell type impact modifier and the organic silicon impact modifier compound into a high-speed mixer, adding the processing aid into the mixer under high-speed stirring, mixing with the acrylate core-shell type impact modifier and the organic silicon impact modifier compound, and cooling to room temperature to obtain a mixture A for later use;

s3, sequentially adding the polypropylene resin, the antibacterial agent, the anti-blushing auxiliary agent, the mixture A and the color auxiliary agent, and then uniformly mixing under a high-speed stirring condition to obtain a mixed material B;

and S4, adding the mixed material B into a double-screw extruder, extruding the mixed material into strip-shaped articles by using the extruder, and performing cold cutting to obtain master batches to obtain the polypropylene composite material.

The invention provides a preparation method of an anti-blushing and antibacterial polypropylene composite material for case injection molding, which comprises the following steps of: the temperature of the first zone is 30 ℃, the temperature of the second zone is 250-. The temperature of the first zone is normal temperature, so that the material is quickly conveyed into the screw rod, and the material accumulation at the feed opening is avoided.

Wherein, Pt₂Ag₄The preparation method of the/MgAl-LDHs comprises the following steps: weigh 0.50g K₂PtCl₄And proper amount of silver lignosulfonate sol are respectively dissolved in deionized water, so that n (Pt) and n (Ag) are 1: 2. Simultaneously adding the powder into a beaker weighed with 0.50g of magnesium-aluminum hydrotalcite, continuously stirring for 5 hours in a constant-temperature water bath kettle at the temperature of 80 ℃, filtering, washing for 3-5 times by using deionized water, and drying for 8 hours at the temperature of 60 ℃ to obtain Pt₂Ag₄/MgAl-LDHs。

Example 5: anti-blushing auxiliary agent and application method thereof

An anti-blushing auxiliary agent comprises the following components: 6 parts of ethylene-copolymer, 4 parts of metal nitride and 3 parts of platinum group metal compound.

The preparation method of the anti-whitening auxiliary agent in the embodiment is to use the anti-whitening auxiliary agent in the case injection molding material, wherein the case injection molding material comprises the following components in parts by weight: 70 parts of polypropylene resin, Pt₂Ag₄6 parts of/MgAl-LDHs, 6 parts of a toughening agent, 7 parts of an anti-blushing auxiliary agent, 2 parts of modified polytetrafluoroethylene resin and 2 parts of a color auxiliary agent; the anti-blushing auxiliary agent comprises the following components: 8 parts of ethylene-copolymer, 5 parts of gallium nitride and 5 parts of sodium hexachlororuthenate.

The preparation method comprises the following steps:

the method specifically comprises the following operation steps:

s1, weighing 70 parts of polypropylene resin and Pt in parts by weight₂Ag₄6 parts of/MgAl-LDHs, 6 parts of acrylate core-shell impact modifier and organosilicon impact modifier compound, 7 parts of anti-blushing auxiliary agent, 2 parts of modified polytetrafluoroethylene resin and 2 parts of color auxiliary agent as raw materials;

s2, adding the acrylate core-shell type impact modifier and the organic silicon impact modifier compound into a high-speed mixer, mixing the modified polytetrafluoroethylene resin with the acrylate core-shell type impact modifier and the organic silicon impact modifier compound in the mixer under high-speed stirring, and cooling to room temperature to obtain a mixture A for later use;

s3, sequentially adding polypropylene resin and Pt₂Ag₄MgAl-LDHs, an anti-blushing auxiliary agent, a mixture A and a color auxiliary agent, and then uniformly mixing the materials under the condition of high-speed stirring to prepare a mixed material B;

and S4, adding the mixed material B into a double-screw extruder, extruding the mixed material into strip-shaped articles by using the extruder, and performing cold cutting to obtain master batches to obtain the polypropylene composite material.

The invention provides a preparation method of an anti-blushing and antibacterial polypropylene composite material for case injection molding, which comprises the following steps of: the temperature of the first zone is 30 ℃, the temperature of the second zone is 250-. The temperature of the first zone is normal temperature, so that the material is quickly conveyed into the screw rod, and the material accumulation at the feed opening is avoided.

Wherein, Pt₂Ag₄The preparation method of the/MgAl-LDHs comprises the following steps: weigh 0.50g K₂PtCl₄And proper amount of silver lignosulfonate sol are respectively dissolved in deionized water, so that n (Pt) and n (Ag) are 1: 2. Simultaneously adding the powder into a beaker weighed with 0.50g of magnesium-aluminum hydrotalcite, continuously stirring for 5 hours in a constant-temperature water bath kettle at the temperature of 80 ℃, filtering, washing for 3-5 times by using deionized water, and drying for 8 hours at the temperature of 60 ℃ to obtain Pt₂Ag₄/MgAl-LDHs。

Comparative example: whitening-resistant and antibacterial polypropylene composite material for injection molding of cases and bags and preparation method thereof

An anti-blushing and antibacterial polypropylene composite material for injection molding of cases and bags comprises the following components in parts by weight: 75 parts of polypropylene resin, 9 parts of an antibacterial agent, 4 parts of a toughening agent, 15 parts of an anti-blushing auxiliary agent, 1 part of a processing auxiliary agent and 1 part of a color auxiliary agent; wherein the anti-blushing auxiliary agent is 5 parts of ethylene-copolymer.

The preparation method comprises the following steps:

the method specifically comprises the following operation steps:

s1, weighing 75 parts of polypropylene resin, 9 parts of an antibacterial agent, 4 parts of a toughening agent, 15 parts of an anti-whitening auxiliary agent, 1 part of a processing auxiliary agent and 1 part of a color auxiliary agent in parts by weight as raw materials;

s2, adding a toughening agent into a high-speed mixer, adding a processing aid into the mixer under high-speed stirring, mixing with the toughening agent, and cooling to room temperature to obtain a mixture A for later use;

s3, sequentially adding the polypropylene resin, the antibacterial agent, the anti-blushing auxiliary agent, the mixture A and the color auxiliary agent, and then uniformly mixing under a high-speed stirring condition to obtain a mixed material B;

and S4, adding the mixed material B into a double-screw extruder, extruding the mixed material into strip-shaped articles by using the extruder, and performing cold cutting to obtain master batches to obtain the polypropylene composite material.

The invention provides a preparation method of an anti-blushing and antibacterial polypropylene composite material for case injection molding, which comprises the following steps of: the temperature of the first zone is 30 ℃, the temperature of the second zone is 250-. The temperature of the first zone is normal temperature, so that the material is quickly conveyed into the screw rod, and the material accumulation at the feed opening is avoided.

The polypropylene composite materials in examples 1-5 and comparative examples were tested for various properties, and the test results are as follows:

according to the comparison of the data of the examples 1-5 and the comparative example, the anti-whitening auxiliary provided by the invention greatly improves the ball drop whitening performance of the composite material, improves the scratch resistance, ensures the tensile strength and has industrial value.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.