Silicone surface treatment agent and use thereof

Abstract

The present application belongs to the technical field of surface treatment agent, and relates to a kind of organic silicon surface treatment agent and its application.The treatment agent can form a uniform, dense protective layer on the surface of PVC, PU, PET and other synthetic leather or plastic film, not only endowing synthetic leather and plastic film with excellent skin-friendly feeling and stain resistance, but also providing good wear resistance, chemical resistance, and enhancing the adhesion between synthetic leather / plastic film and addition type silicone rubber on the surface of synthetic leather / plastic film, thereby forming a firm adhesive layer, and being widely used in the combination of synthetic leather / plastic film and silicone rubber.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of surface treatment agents, and relates to an organic silicon surface treatment agent and application thereof. BACKGROUND

[0002] Synthetic leather is a kind of artificial material, which is often used in various furniture, car seats and bags and other applications. In order to improve the performance and appearance of synthetic leather, surface coating technology is widely used. Surface treatment agent is a common coating technology, which can form a protective layer on the surface of synthetic leather, provide additional functions and protection, and also play an important role in the adhesion process of synthetic leather and other materials. In recent years, consumers have higher and higher requirements for the wear resistance and skin feel of the surface of synthetic leather, and the original ordinary synthetic leather surface treatment agent cannot guarantee the stability and effectiveness of the adhesion performance of synthetic leather and silicone rubber. Therefore, how to improve the wear resistance and skin feel of the protective layer without affecting other physical properties of the surface treatment agent is particularly important. SUMMARY

[0003] The technical problem solved by the application is to provide an organic silicon surface treatment agent, which can form a uniform and dense protective layer on the surface of PVC, PU, PET and other synthetic leather or plastic film, not only endowing it with excellent skin feel and stain resistance, but also providing good wear resistance and chemical resistance. On the other hand, the treatment agent can also enhance the adhesion between PVC, PU, PET and other synthetic leather or plastic film and addition type silicone rubber, thereby forming a firm adhesive layer, which is widely used in the combination of synthetic leather / plastic film and silicone rubber.

[0004] The application will solve the above problems through the following technical solutions:

[0005] On the one hand, the application provides an organic silicon surface treatment agent, which comprises A component and B component with a weight ratio of 1:1: the A component, according to 100% of the total weight of the A component, comprises the following components: FEVE resin 20-50%, catalyst 0.5-2%, ester solvent 48-79.5%; the B component, according to 100% of the total weight of the B component, comprises the following components: organic silicon prepolymer 10-50%, ester solvent 50-90%.

[0006] Further, the hydroxyl content of the FEVE resin is >1.7wt%.

[0007] Further, the preparation method of the organic silicon prepolymer comprises the following steps: mixing hydroxypropyl silicone oil and isocyanate according to a hydroxyl: isocyanate group molar ratio of 1:2-8 (-OH:-NCO=1:2-8), reacting at 75-90 degrees for 3-5 hours, and obtaining the organic silicon prepolymer after cooling to room temperature.

[0008] Further, the hydroxypropyl silicone oil is a side chain vinyl-containing hydroxypropyl silicone oil, which has a siloxane chain as a main chain and a side chain with active vinyl groups, and preferably has a molecular weight of 1000-4000.

[0009] Further, the vinyl content of the side chain of the hydroxypropyl silicone oil is 0.5-3.5 wt%.

[0010] Further, the catalyst is preferably an organic bismuth catalyst.

[0011] Further, the isocyanate is an aliphatic polyisocyanate (functionality > 2) or a mixture of aliphatic isocyanate and aromatic isocyanate, and the weight of the aliphatic isocyanate in the mixture is > 60%.

[0012] Further, the ester solvents of the A component and the B component both preferably include ethyl acetate.

[0013] In another aspect, the present application also provides the use of the above-mentioned silicone surface treatment agent in treating the surface of synthetic leather or silicone rubber. The use not only serves as a silicone treatment layer on the surface of synthetic leather to improve the surface properties of synthetic leather, but also serves as an adhesive to enhance the adhesion between synthetic leather / plastic film and silicone rubber, especially addition-type silicone rubber.

[0014] The application method of the present application is to mix the A component and the B component and then apply them in the form of a solution on the surface of synthetic leather or plastic film, and then perform drying or curing treatment to form a protective layer of synthetic leather or plastic film or an adhesive layer for fixing silicone rubber. Generally, curing is performed at 80-120 degrees for 5-10 minutes, and complete curing requires continued storage at room temperature for at least 24 hours.

[0015] The present application has the advantages that the silicone surface treatment agent of the present application can impart excellent skin-friendly feeling and stain resistance to synthetic leather, and the Martin's abrasion resistance can be up to more than 10W times, and the cost is relatively low. The present application can also form a firm bond between the treated synthetic leather or plastic film made of PVC, PU, PET, etc. and addition-type silicone rubber, and plays an important role in the process of composite material bonding. DETAILED DESCRIPTION

[0016] The present application will be described in detail below in conjunction with specific embodiments, and the embodiments are only preferred embodiments of the present application, not limitations thereof.

[0017] Example 1:

[0018] The present embodiment provides a silicone surface treatment agent, which is divided into an A component and a B component:

[0019] A component: 200 grams of FEVE resin with a hydroxyl content of 2.3% is dissolved in 795 grams of ethyl acetate, 5 grams of catalyst is added to obtain 1000 grams of A component;

[0020] B component: 2095 grams of hydroxypropyl silicone oil with a molecular weight of 4000 and a side chain vinyl content of 3.5wt% is reacted with 100 grams of aliphatic HDI trimer, -OH:-NCO=1:2, at 75 degrees for 3 hours, after being cooled to room temperature, the above reaction is added to 2195 grams of ethyl acetate for dilution to obtain 4390 grams of B component;

[0021] After mixing all the A components obtained above with 1000 grams of B component uniformly, it is coated on the surface of PVC synthetic leather by spraying or rolling, and placed in a 100-degree oven for baking for 5 minutes, and then placed at room temperature for 1 day, and performance test is carried out.

[0022] Example 2:

[0023] This example provides a silicone surface treatment agent, which is divided into A component and B component:

[0024] A component: 500 grams of FEVE resin with a hydroxyl content of 2.3% is dissolved in 480 grams of ethyl acetate, 20 grams of catalyst is added to obtain 1000 grams of A component;

[0025] B component: 131 grams of hydroxypropyl silicone oil with a molecular weight of 1000 and a side chain vinyl content of 0.5wt% is reacted with 100 grams of aliphatic HDI trimer, -OH:-NCO=1:8, at 75 degrees for 3 hours, after being cooled to room temperature, the above reaction is added to 2079 grams of ethyl acetate for dilution to obtain 2310 grams of B component;

[0026] After mixing all the A components obtained above with 1000 grams of B component uniformly, it is coated on the surface of PVC synthetic leather by spraying or rolling, and placed in a 100-degree oven for baking for 5 minutes, and then placed at room temperature for 1 day, and performance test is carried out.

[0027] Example 3:

[0028] This example provides a silicone surface treatment agent, which is divided into A component and B component:

[0029] A component: 200 grams of FEVE resin with a hydroxyl content of 2.3% is dissolved in 790 grams of ethyl acetate, 10 grams of catalyst is added to obtain 1000 grams of A component;

[0030] B component: 350 grams of hydroxypropyl silicone oil with molecular weight 2000 and 2wt% of side chain vinyl content was reacted with 60 grams of aliphatic HDI trimer, 40 grams of TDI trimer, -OH: -NCO = 1:4, at 75 degrees for 3 hours, after being reduced to room temperature, the above reaction was added to 550 grams of ethyl acetate for dilution, to obtain 1000 grams of B component;

[0031] After mixing 1000 grams of A component and 1000 grams of B component obtained above uniformly, it was coated on the surface of PU synthetic leather by spraying or rolling, and placed in a 100 degree oven for 5 minutes, and then left at room temperature for 1 day, and then tested for performance.

[0032] Comparative Example 1:

[0033] The difference between this comparative example 1 and example 3 is that 60 grams of aliphatic HDI trimer, 40 grams of TDI trimer are replaced by 50 grams of aliphatic HDI trimer, 50 grams of TDI trimer.

[0034] Comparative Example 2:

[0035] The difference between this comparative example 2 and example 3 is that the FEVE hydroxyl content is 1%.

[0036] Comparative Example 3:

[0037] The difference between this comparative example 3 and example 3 is that the vinyl content of the hydroxypropyl silicone oil is 0%.

[0038] Comparative Example 4:

[0039] The difference between this comparative example 4 and example 1 is that 2195 grams of ethyl acetate in B component is replaced by 1500 grams.

[0040] Comparative Example 5:

[0041] The difference between this comparative example 5 and example 2 is that 500 grams of FEVE resin with a hydroxyl content of 2.3% dissolved in 480 grams of ethyl acetate is replaced by 600 grams of FEVE resin with a hydroxyl content of 2.3% dissolved in 380 grams of ethyl acetate.

[0042] Comparative Example 6:

[0043] A component: 100 grams of FEVE resin with a hydroxyl content of 2.3% was dissolved in 880 grams of ethyl acetate, and 20 grams of catalyst was added to obtain 1000 grams of A component;

[0044] Group B: 131 grams of hydroxypropyl silicone oil with molecular weight 1000 and side chain vinyl content 2.5wt% was reacted with 100 grams of aliphatic HDI trimer, -OH:-NCO=1:8, at 75 degrees for 3 hours, after being reduced to room temperature, the above reaction was added to 4389 grams of ethyl acetate for dilution, to obtain 4620 grams of Group B.

[0045] After mixing 1000 grams of the above obtained Group A with 1000 grams of Group B uniformly, it was coated on the surface of PET synthetic leather by spraying or rolling, and was placed in an oven at 100 degrees for 5 minutes, and then was left at room temperature for 1 day, and then was tested for performance.

[0046] The following performance tests were conducted on Examples 1-3 and Comparative Examples 1-5, and the testing method was as follows:

[0047] ① Solubility: by visual observation.

[0048] ② Skin feel: according to the skin experience, it was divided into 1-6 levels, with level 1 being the most skin-friendly.

[0049] ③ Martindale abrasion resistance: GB / T 21196.2.

[0050] ④ Stain resistance test: whether the oily marker pen can be completely wiped off with a paper towel.

[0051] ⑤ Alcohol resistance test: 1000 grams of alcohol cotton cloth was applied for 60 cycles.

[0052] ⑥ Adhesion of addition type silicone: after mixing Group A and Group B uniformly, it was coated on the respective surface by spraying or rolling, and the addition type silicone was covered on the coated surface, and after drying or curing treatment, an adhesive layer was formed, and the crosshatch method was used for testing.

[0053] Table 1 below is the test results of Examples 1-3 and Comparative Examples 1-5.

[0054] Table 1

[0055]

[0056]

[0057] From the above test results, it can be seen that the silicone surface treatment agent described in the present application has excellent skin-friendly feel and stain resistance, and can also provide good abrasion resistance, chemical resistance, and the Martindale abrasion resistance can reach more than 10W times. The present application can also enhance the adhesion between synthetic leather and silicone rubber, so that the treated material and the addition type silicone rubber form a firm adhesion, and the adhesion strength of the adhesion interface is very high, and can withstand a large external stress without adhesion failure.

[0058] It can be understood that the above specific embodiments are further illustrations of the present application and are not used to limit the protection scope of the present application, and all other decorations and modifications obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

Claims

1. A silicone surface treatment agent, characterized by, The A component and the B component in a weight ratio of 1:1: the A component comprises, based on the total weight of the A component as 100%, the following components: FEVE resin 20-50%, catalyst 0.5-2%, ester solvent 48-79.5%; the B component comprises, based on the total weight of the B component as 100%, the following components: silicone prepolymer 10-50%, ester solvent 50-90%; the FEVE resin has a hydroxyl content of >1.7 wt%; the method for preparing the silicone prepolymer comprises the following steps: mixing hydroxypropyl silicone oil and isocyanate at a hydroxyl: isocyanate group molar ratio of 1:2-8, and reacting at 75-90 degrees for 3-5 hours, and obtaining the silicone prepolymer after cooling to room temperature; the hydroxypropyl silicone oil is a hydroxypropyl silicone oil with a vinyl group in the side chain; the vinyl content of the side chain of the hydroxypropyl silicone oil is 0.5-3.5 wt%, and the molecular weight is 1000-4000; the isocyanate is an aliphatic polyisocyanate with a functionality greater than 2 or a mixture of aliphatic isocyanate and aromatic isocyanate, and the weight of the aliphatic isocyanate in the mixture is >60%.

2. The silicone surface treatment agent according to claim 1, characterized by, The ester solvent comprises ethyl acetate.

3. Use of the silicone surface treatment agent according to any one of claims 1-2 in treating the surface of synthetic leather or silicone rubber.

4. Use according to claim 3, characterized in that, The A component and the B component are mixed and then coated in solution form on the surface of synthetic leather or PVC, PU, PET film, and after drying or curing treatment, a protective layer is formed.

5. Use according to claim 3, characterized in that, The A component and the B component are mixed and then coated in solution form on the surface of synthetic leather or PVC, PU, PET film, and then silicone rubber is covered on the coated surface, and after drying or curing treatment, an adhesive layer is formed.

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