PTFE base material surface activating treatment method for soil sample storage bottle

Abstract

The invention relates to the technical field of PTFE base material surface treatment, in particular to a PTFE base material surface activating treatment method for a soil sample storage bottle, which comprises the following steps: step 1, placing a PTFE base material to be treated in a container, vacuumizing the interior of the container, and then preheating the PTFE base material to 200-230 DEG C; 2, aluminum powder particles are heated to 400-450 DEG C, and under driving of high-pressure nitrogen, the aluminum powder particles are evenly sprayed to the surface of the PTFE base material; 3, the PTFE base material is cooled to 50-80 DEG C, oxygen is injected into the container, the content of the oxygen in the container is controlled to be 5%-8%, and then the PTFE base material is subjected to corona treatment.According to the PTFE base material surface activating treatment method, aluminum oxide is generated on the PTFE base material, after the aluminum oxide is modified through KH570, the adhesion performance of the aluminum oxide can be improved, and the service life of the aluminum oxide is prolonged; and finally, the corona treatment surface of the PTFE base material is uniformly coated with a surface modifier, so that the adhesion property of the PTFE base material can be effectively improved, and the PTFE base material is convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of PTFE substrate surface treatment, in particular to a PTFE substrate surface activation treatment method for a soil sample preservation bottle. Background Art

[0002] Soil sampling refers to the method of collecting soil samples, including the layout of the sampling and sampling technology. Before sampling, the profile should be repaired and cleaned, and the top layer of loose soil should be removed. Then samples are taken from the central typical part layer by layer from top to bottom. After the soil sampling is completed, the soil samples need to be transported to the laboratory for inspection. At this time, sample preservation bottles are needed. The staff uses sample preservation bottles to store the collected soil for subsequent inspection.

[0003] During the use of soil sample storage bottles, it is necessary to ensure that the properties of the soil do not change and do not react with the soil.

[0004] Teflon generally refers to polytetrafluoroethylene. Polytetrafluoroethylene (PTFE), commonly known as the "King of Plastics", is a high molecular polymer made by polymerizing tetrafluoroethylene as a monomer. Its chemical formula is (C2F4)n. It has excellent heat and cold resistance and can be used for a long time at -180 to 260°C. This material is resistant to acids, alkalis, and various organic solvents, and is almost insoluble in all solvents. At the same time, polytetrafluoroethylene is resistant to high temperatures and has an extremely low friction coefficient. Using PTFE to make a soil sample preservation bottle, the soil is not easy to adhere to the inner wall of the sample preservation bottle, and the sample preservation bottle is easy to clean.

[0005] Since polytetrafluoroethylene sheet has the smallest surface tension among solid materials, it does not adhere to any substance, and its friction coefficient is extremely small in mechanical properties, which is only 1 / 5 of polyethylene. This is an important feature of the perfluorocarbon surface. Since the intermolecular force between fluorine-carbon chains is extremely low, polytetrafluoroethylene has strong non-stickiness. When making an ink shading layer or adhering a label on the outer wall of the soil sample preservation bottle, the ink shading layer is difficult to adhere, and the label is also difficult to attach, which affects the use of the soil sample preservation bottle. In order to improve the adhesion of the surface of the PTFE sample preservation bottle, we proposed a surface activation treatment method for the PTFE substrate of the soil sample preservation bottle to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a method for activating the surface of a PTFE substrate of a soil sample preservation bottle.

[0007] A method for activating the surface of a PTFE substrate of a soil sample preservation bottle comprises the following steps:

[0008] Step 1, placing the PTFE substrate to be treated in a container, vacuuming the interior of the container, and then preheating the PTFE substrate to 200-230° C.;

[0009] Step 2: Heat the aluminum powder particles to 400-450° C. and spray the aluminum powder particles evenly on the surface of the PTFE substrate under the drive of high-pressure nitrogen;

[0010] Step 3, cooling the PTFE substrate to 50-80° C., filling the container with oxygen, controlling the oxygen content in the container to 5%-8%, and then performing corona treatment on the PTFE substrate, wherein the surface of the PTFE substrate sprayed with aluminum powder particles is the corona treated surface;

[0011] Step 4: After the corona treatment is completed, KH570 is evenly coated on the corona treated surface of the PTFE substrate;

[0012] Step 5, subjecting the PTFE substrate coated with KH570 to ultrasonic treatment, and drying the PTFE substrate after completion;

[0013] Step 6: Performing surface modification treatment on the dried PTFE substrate, uniformly coating the surface modifier on the corona treated surface of the PTFE substrate, and obtaining a PTFE substrate after surface activation treatment.

[0014] Preferably, in step 6, the surface modifier is a mixture of carboxylated styrene butadiene latex and epoxybutene, and the mass ratio of carboxylated styrene butadiene latex to epoxybutene is 0.1-0.3:1.

[0015] Preferably, in step 2, the particle size of the aluminum powder particles is 10-40 μm.

[0016] Preferably, in step 2, the temperature of the high-pressure nitrogen is 350-400° C., and the pressure of the high-pressure nitrogen is 0.1-0.3 MPa.

[0017] Preferably, in step 3, the voltage of the corona activation treatment is 1000V-20000V; the treatment time of the corona activation treatment is 5s-600s; the discharge gap of the corona activation treatment is 0.5cm-5cm; the corona speed of the corona activation treatment is 0.1-100m / min; and the power of the corona activation treatment is 200W-5000W.

[0018] Preferably, in step 3, the amount of aluminum powder particles used is 15-30 g / m 2 .

[0019] Preferably, in step 4, the amount of KH570 used is 25-40 g / m 2 .

[0020] Preferably, in step 5, the ultrasonic treatment time is 20-40 min, the ultrasonic treatment power is 200-500 W, and the ultrasonic treatment frequency is 25-50 KHz.

[0021] Preferably, in step 6, the amount of the surface modifier used is 30-45 g / m 2 .

[0022] The beneficial effects of the present invention are:

[0023] 1. The surface activation treatment method of the PTFE substrate proposed by the present invention comprises the following steps: firstly embedding aluminum powder particles on the surface of the PTFE substrate, and then performing corona treatment on the PTFE substrate. During the corona treatment, the surface energy of the PTFE substrate can be improved, and the adhesion performance of the PTFE substrate can be improved. Moreover, the corona treatment can oxidize the aluminum powder particles on the surface of the PTFE substrate to generate aluminum oxide on the PTFE substrate. After the aluminum oxide is modified by KH570, the adhesion performance of the aluminum oxide can be improved. Finally, the surface modifier is evenly coated on the corona treated surface of the PTFE substrate, which can effectively improve the adhesion performance of the PTFE substrate and facilitate the use of the PTFE substrate.

[0024] 2. The surface activation treatment method of the PTFE substrate proposed in the present invention is to subject the PTFE substrate coated with KH570 to ultrasonic treatment. The ultrasonic treatment can effectively improve the bonding force between KH570 and alumina, and can remove excess KH570 on the PTFE substrate, which is convenient for subsequent treatment.

[0025] 3. The surface activation treatment method of the PTFE substrate proposed by the present invention, the surface modifier is a mixture of carboxyl styrene butadiene latex and epoxybutene, the surface of the PTFE substrate can be epoxidized by epoxybutene, and an epoxidized film is formed on the surface of the PTFE substrate, the strength of the film can be improved by carboxyl styrene butadiene latex, and aluminum oxide can form "anchor points" on the inner side of the film, effectively improving the connection strength between the film and the PTFE substrate. DETAILED DESCRIPTION

[0026] The present invention will be further explained below in conjunction with specific embodiments.

[0027] In the following embodiments, the experimental methods or test methods, unless otherwise specified, are conventional methods; reagents and materials, unless otherwise specified, are obtained from conventional commercial channels or prepared by conventional methods, wherein: silane coupling agent KH570 was purchased from Shandong Huachen New Materials Co., Ltd.; carboxylated styrene butadiene latex and epoxybutene were purchased from Hubei Yuancheng Saichuang Technology Co., Ltd.; ink is water-based UV ink, purchased from Zhejiang Meilihua Printing Materials Technology Co., Ltd.

[0028] In Example 1, a method for activating the surface of a PTFE substrate of a soil sample storage bottle comprises the following steps:

[0029] Step 1, placing the PTFE substrate to be treated in a container, vacuumizing the interior of the container, and then preheating the PTFE substrate to 200° C.;

[0030] Step 2: heating the aluminum powder particles to 400° C. and spraying the aluminum powder particles evenly on the surface of the PTFE substrate under the drive of high-pressure nitrogen;

[0031] Step 3, cooling the PTFE substrate to 50° C., filling the container with oxygen, controlling the oxygen content in the container to 5%, and then performing corona treatment on the PTFE substrate, wherein the surface of the PTFE substrate sprayed with aluminum powder particles is the corona treated surface;

[0032] Step 4: After the corona treatment is completed, KH570 is evenly coated on the corona treated surface of the PTFE substrate;

[0033] Step 5, subjecting the PTFE substrate coated with KH570 to ultrasonic treatment, and drying the PTFE substrate after completion;

[0034] Step 6: Performing surface modification treatment on the dried PTFE substrate, uniformly coating the surface modifier on the corona treated surface of the PTFE substrate, and obtaining a PTFE substrate after surface activation treatment.

[0035] In step 6, the surface modifier is a mixture of carboxylated styrene butadiene latex and epoxybutene, and the mass ratio of carboxylated styrene butadiene latex to epoxybutene is 0.1:1.

[0036] In step 2, the particle size of the aluminum powder particles is 10-40 μm.

[0037] In step 2, the temperature of the high-pressure nitrogen is 350° C., and the pressure of the high-pressure nitrogen is 0.1 MPa.

[0038] In step 3, the voltage of the corona activation treatment is 1000V; the treatment time of the corona activation treatment is 600s; the discharge gap of the corona activation treatment is 0.5cm; the corona speed of the corona activation treatment is 0.1m / min; and the power of the corona activation treatment is 200W.

[0039] In step 3, the amount of aluminum powder particles used is 15g / m 2 .

[0040] In step 4, the amount of KH570 used is 25g / m 2 .

[0041] In step 5, the ultrasonic treatment time is 20 min, the ultrasonic treatment power is 200 W, and the ultrasonic treatment frequency is 25 KHz.

[0042] In step 6, the amount of surface modifier used is 30g / m 2 .

[0043] In Example 2, a method for activating the surface of a PTFE substrate of a soil sample storage bottle comprises the following steps:

[0044] Step 1, placing the PTFE substrate to be treated in a container, vacuumizing the interior of the container, and then preheating the PTFE substrate to 230° C.;

[0045] Step 2, heating the aluminum powder particles to 450° C., and spraying the aluminum powder particles evenly on the surface of the PTFE substrate under the drive of high-pressure nitrogen;

[0046] Step 3, cooling the PTFE substrate to 80° C., filling the container with oxygen, controlling the oxygen content in the container to 8%, and then performing corona treatment on the PTFE substrate, wherein the surface of the PTFE substrate sprayed with aluminum powder particles is the corona treated surface;

[0047] Step 4: After the corona treatment is completed, KH570 is evenly coated on the corona treated surface of the PTFE substrate;

[0048] Step 5, subjecting the PTFE substrate coated with KH570 to ultrasonic treatment, and drying the PTFE substrate after completion;

[0049] Step 6: Performing surface modification treatment on the dried PTFE substrate, uniformly coating the surface modifier on the corona treated surface of the PTFE substrate, and obtaining a PTFE substrate after surface activation treatment.

[0050] In step 6, the surface modifier is a mixture of carboxylated styrene butadiene latex and epoxybutene, and the mass ratio of carboxylated styrene butadiene latex to epoxybutene is 0.3:1.

[0051] In step 2, the particle size of the aluminum powder particles is 10-40 μm.

[0052] In step 2, the temperature of the high-pressure nitrogen is 400° C., and the pressure of the high-pressure nitrogen is 0.3 MPa.

[0053] In step 3, the voltage of the corona activation treatment is 20000V; the treatment time of the corona activation treatment is 5s; the discharge gap of the corona activation treatment is 5cm; the corona speed of the corona activation treatment is 100m / min; and the power of the corona activation treatment is 5000W.

[0054] In step 3, the amount of aluminum powder particles used is 30g / m 2 .

[0055] In step 4, the amount of KH570 used is 40g / m 2 .

[0056] In step 5, the ultrasonic treatment time is 40 minutes, the ultrasonic treatment power is 500W, and the ultrasonic treatment frequency is 50KHz.

[0057] In step 6, the amount of surface modifier used is 45g / m 2 .

[0058] In Example 3, a method for activating the surface of a PTFE substrate of a soil sample storage bottle comprises the following steps:

[0059] Step 1, placing the PTFE substrate to be treated in a container, vacuuming the interior of the container, and then preheating the PTFE substrate to 210° C.;

[0060] Step 2, heating the aluminum powder particles to 430° C., and spraying the aluminum powder particles evenly on the surface of the PTFE substrate under the drive of high-pressure nitrogen;

[0061] Step 3, cooling the PTFE substrate to 70° C., filling the container with oxygen, controlling the oxygen content in the container to 7%, and then performing corona treatment on the PTFE substrate, wherein the surface of the PTFE substrate sprayed with aluminum powder particles is the corona treated surface;

[0062] Step 4: After the corona treatment is completed, KH570 is evenly coated on the corona treated surface of the PTFE substrate;

[0063] Step 5, subjecting the PTFE substrate coated with KH570 to ultrasonic treatment, and drying the PTFE substrate after completion;

[0064] Step 6: Performing surface modification treatment on the dried PTFE substrate, uniformly coating the surface modifier on the corona treated surface of the PTFE substrate, and obtaining a PTFE substrate after surface activation treatment.

[0065] In step 6, the surface modifier is a mixture of carboxylated styrene butadiene latex and epoxybutene, and the mass ratio of carboxylated styrene butadiene latex to epoxybutene is 0.2:1.

[0066] In step 2, the particle size of the aluminum powder particles is 10-40 μm.

[0067] In step 2, the temperature of the high-pressure nitrogen is 380° C., and the pressure of the high-pressure nitrogen is 0.2 MPa.

[0068] In step 3, the voltage of the corona activation treatment is 10000V; the treatment time of the corona activation treatment is 20s; the discharge gap of the corona activation treatment is 2cm; the corona speed of the corona activation treatment is 10m / min; and the power of the corona activation treatment is 1000W.

[0069] In step 3, the amount of aluminum powder particles used is 25g / m 2 .

[0070] In step 4, the amount of KH570 used is 30g / m 2 .

[0071] In step 5, the ultrasonic treatment time is 30 minutes, the ultrasonic treatment power is 300W, and the ultrasonic treatment frequency is 40KHz.

[0072] In step 6, the amount of surface modifier used is 35g / m 2 .

[0073] In Comparative Example 1, compared with Example 3, aluminum powder particles were not sprayed on the surface of the PTFE substrate, and the rest was the same as Example 3.

[0074] In Comparative Example 2, compared with Example 3, after corona treatment, KH570 was not evenly coated on the surface of the PTFE substrate, and the rest was the same as Example 3.

[0075] In Comparative Example 3, compared with Example 3, after KH570 was uniformly coated on the corona-treated surface of the PTFE substrate, no ultrasonic treatment was performed, and the rest was the same as Example 3.

[0076] In Comparative Example 4, compared with Example 3, the surface modification treatment was not performed on the dried PTFE substrate, and the rest was the same as Example 3.

[0077] The performance of the surface-treated PTFE substrates of Examples 1-3 and Comparative Examples 1-4 was tested below. Ink was coated on the surface-treated PTFE substrates of Examples 1-3 and Comparative Examples 1-4, and ink was coated on an untreated PTFE substrate as a control example. After the ink was cured, the adhesion of the ink was tested according to the cross-cut test standard of GB / T9286-1998. The results are shown in Table 1.

[0078] Table 1

[0079] Ink Adhesion (GB / T9286-1998) Example 1 Level 2 Example 2 Level 2 Example 3 Level 2 Comparative Example 1 Level 1 Comparative Example 2 Level 1 Comparative Example 3 Level 1 Comparative Example 4 Level 1 Comparison example Level 0

[0080] It can be seen from Table 1 that the ink has been firmly attached to the PTFE substrate treated in Examples 1-3; in Comparative Example 1, aluminum powder particles were not sprayed on the surface of the PTFE substrate, and the adhesion of the ink was reduced; in Comparative Example 2, KH570 was not evenly coated on the surface of the PTFE substrate after corona treatment, and the adhesion of the ink was reduced; in Comparative Example 3, after KH570 was evenly coated on the corona-treated surface of the PTFE substrate, ultrasonic treatment was not performed, and the adhesion of the ink was reduced; in Comparative Example 4, the surface modification treatment of the dried PTFE substrate was not performed, and the adhesion of the ink was also reduced.

[0081] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for activating the surface of a PTFE substrate of a soil sample storage bottle, characterized in that: The following steps are involved: Step 1, placing the PTFE substrate to be treated in a container, vacuuming the interior of the container, and then preheating the PTFE substrate to 200-230° C.; Step 2: Heat the aluminum powder particles to 400-450° C. and spray the aluminum powder particles evenly on the surface of the PTFE substrate under the drive of high-pressure nitrogen; Step 3, cooling the PTFE substrate to 50-80° C., filling the container with oxygen, controlling the oxygen content in the container to 5%-8%, and then performing corona treatment on the PTFE substrate, wherein the surface of the PTFE substrate sprayed with aluminum powder particles is the corona treated surface; Step 4: After the corona treatment is completed, KH570 is evenly coated on the corona treated surface of the PTFE substrate; Step 5, subjecting the PTFE substrate coated with KH570 to ultrasonic treatment, and drying the PTFE substrate after completion; Step 6: Performing surface modification treatment on the dried PTFE substrate, uniformly coating the surface modifier on the corona treated surface of the PTFE substrate, and obtaining a PTFE substrate after surface activation treatment.

2. The method for surface activation of a PTFE substrate of a soil sample storage bottle according to claim 1, characterized in that: In the step 6, the surface modifier is a mixture of carboxylated styrene butadiene latex and epoxybutene, and the mass ratio of carboxylated styrene butadiene latex to epoxybutene is 0.1-0.3:

1.

3. The method for surface activation of a PTFE substrate of a soil sample storage bottle according to claim 1, characterized in that: In the step 2, the particle size of the aluminum powder particles is 10-40 μm.

4. The method for surface activation of a PTFE substrate of a soil sample storage bottle according to claim 1, characterized in that: In the step 2, the temperature of the high-pressure nitrogen is 350-400° C., and the pressure of the high-pressure nitrogen is 0.1-0.3 MPa.

5. The method for surface activation of a PTFE substrate of a soil sample storage bottle according to claim 1, characterized in that: In step 3, the voltage of the corona activation treatment is 1000V-20000V; the treatment time of the corona activation treatment is 5s-600s; the discharge gap of the corona activation treatment is 0.5cm-5cm; the corona speed of the corona activation treatment is 0.1-100m / min; and the power of the corona activation treatment is 200W-5000W.

6. The method for surface activation of a PTFE substrate of a soil sample storage bottle according to claim 5, characterized in that: In step 3, the amount of aluminum powder particles used is 15-30g / m 2 .

7. The method for surface activation of a PTFE substrate of a soil sample storage bottle according to claim 1, characterized in that: In step 4, the amount of KH570 used is 25-40g / m 2 .

8. The method for surface activation of a PTFE substrate of a soil sample storage bottle according to claim 1, characterized in that: In step 5, the ultrasonic treatment time is 20-40 min, the ultrasonic treatment power is 200-500 W, and the ultrasonic treatment frequency is 25-50 KHz.

9. The method for surface activation of a PTFE substrate of a soil sample storage bottle according to claim 2, characterized in that: In step 6, the amount of surface modifier used is 30-45 g / m 2 .