A method for enhancing the adhesion of electroless nickel plating on the surface of a polyester material

Abstract

The application provides a kind of pre-impregnation method for enhancing the surface chemical nickel plating bonding force of polyester material, comprising S1), the plating piece is put into oil removal liquid for oil removal treatment;S2), the plating piece after oil removal is put into roughening liquid and is roughened;S3), the plating piece after roughening is put into sensitization liquid and is sensitized;S4), the plating piece after sensitization is put into palladium chloride activation liquid and is activated;S5), the plating piece after activation is put into pre-impregnation liquid and is pre-impregnated;S6), the plating piece after pre-impregnation is directly put into nickel plating liquid and is nickel plated.The application has the advantages of good coating bonding force, high toughness, bright surface, low cost, strong operability, etc.;The application improves the bonding force of non-metal material surface metallization by oil removal, roughening, sensitization, activation, pre-impregnation and chemical nickel plating, thereby improving the problems of poor bonding force and uneven surface of polyester material during chemical plating.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic surface metallization, in particular to a pre-impregnation method for enhancing the bonding force of chemical nickel plating on the surface of polyester material. BACKGROUND

[0002] The surface metallization of non-metallic materials is an important research direction in the development of new materials due to their potential application value. Metallization can make the surface of plastics have the physical properties of the plated metal, such as electrical conductivity, thermal conductivity, and magnetic conductivity.

[0003] After metallization, the mechanical properties of plastics, such as heat deformation temperature, tensile strength, and impact resistance, are improved. Chemical plating is a common method for the surface metallization of non-metals. It is a controllable, self-catalytic deposition of metal by chemical reduction, and is not affected by the shape of the plated part, has strong operability, and low cost.

[0004] Polyester materials are widely used in the national economy and daily life due to their easy molding, simple processing, light weight, and low price, bringing great convenience to people's lives.

[0005] However, due to their poor weather resistance, small mechanical strength, and non-conductive defects, their performance is limited. Surface metallization by chemical plating can make them have good electrical conductivity and electromagnetic shielding function, making their application range more extensive.

[0006] Bonding force is an important physical parameter for measuring the performance of the plated layer. If it does not meet the standard, the plated layer has no practical value.

[0007] However, there is no report on pre-impregnation solution that can be used to improve the bonding force of polyester surface plating. SUMMARY

[0008] In view of the deficiencies of the prior art, the present application provides a pre-impregnation method for enhancing the bonding force of chemical nickel plating on the surface of polyester material. The present application can improve the problems of poor bonding force and uneven surface during the chemical plating process of polyester material.

[0009] The technical scheme of the present application is as follows: a pre-impregnation method for enhancing the bonding force of chemical nickel plating on the surface of polyester material, comprising the following steps:

[0010] S1), after cleaning the plated part with deionized water, put it into the oil removal liquid and remove oil at 50-70℃ for 5-15min;

[0011] S2), after cleaning the plated part with deionized water, put it into the roughening liquid and roughen at 60-80℃ for 10-20min;

[0012] S3) After the roughening of the plated parts is washed with deionized water, put into the sensitization solution at 25-30 DEG C for 5-10 min;

[0013] S4) After the sensitization of the plated parts is washed with deionized water, put into the palladium chloride activation solution at 25-30 DEG C for 1-5 min;

[0014] S5) After the activation of the plated parts is washed with deionized water, put into the pre-dipping solution at 25-30 DEG C for 2-5 min;

[0015] S6) After the pre-dipping of the plated parts is not washed with water, directly put into the nickel plating solution at 80-85 DEG C for 5-10 min.

[0016] As preferred, step S1), the oil removal solution includes the following components:

[0017] Sodium hydroxide 10-20 g / L;

[0018] Sodium bicarbonate 20-30 g / L.

[0019] As preferred, step S2), the roughening solution includes sulfuric acid 300-400 g / L, potassium permanganate 80-100 g / L, potassium dichromate 80-100 g / L.

[0020] As preferred, step S3), the sensitization solution includes stannous chloride 8-12 g / L, concentrated hydrochloric acid 80-120 ml / L.

[0021] As preferred, step S4), the activation solution is 50-100 ppm palladium chloride solution.

[0022] As preferred, step S5), the pre-dipping solution includes component A component B, wherein the component A is sodium hypophosphite 40-60 g / L, or DMAB 10-20 g / L;

[0023] The component B is KI 6-12 g / L, or sodium alginate 1-4 g / L, or polyvinylpyrrolidone (PVP) 4-10 g / L, or sodium dodecyl benzene sulfonate (SDS) 2-6 g / L.

[0024] As preferred, step S5), the component A component B in the pre-dipping solution is mixed according to the volume 1:1.

[0025] As preferred, step S5), in the pre-dipping solution, the component A is sodium hypophosphite 50 g / L; the component B is sodium alginate 2 g / L.

[0026] As preferred, in step S6), the nickel plating solution is nickel sulfate 15-20 g / L, sodium hypophosphite 20-30 g / L, anhydrous sodium acetate 3-8 g / L, lactic acid 5-10 ml / L, sodium citrate 5-10 g / L, and sodium succinate 3-8 g / L.

[0027] The present application has the following advantages:

[0028] 1. The present application has the advantages of good plating adhesion, high toughness, bright surface, low cost, and strong operability.

[0029] 2. The present application improves the adhesion of the surface metallization of non-metallic materials by oil removal, roughening, sensitization, activation, pre-impregnation, and chemical nickel plating, thereby improving the problems of poor adhesion and uneven surface during chemical plating of polyester materials. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 Fig. 1 is a surface macrograph of a sample treated according to the present application;

[0031] Fig. 2 Fig. 2 is a metallograph of a sample treated according to the present application;

[0032] Fig. 3 Fig. 3 is a comparison chart of the plating adhesion of a sample treated according to the present application. DETAILED DESCRIPTION

[0033] The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings:

[0034] Cut a sample of a certain area and perform chemical nickel plating according to the following steps: oil removal → water washing → roughening → water washing → sensitization → water washing → activation → water washing → pre-impregnation → chemical nickel plating.

[0035] Example 1

[0036] The present embodiment provides a pre-impregnation method for enhancing the chemical nickel plating adhesion of a polyester material surface, comprising the following steps:

[0037] S1), after cleaning the plating piece with deionized water, put it into an oil removal solution composed of sodium hydroxide 10 g / L and sodium bicarbonate 20 g / L, and remove oil at 50°C for 15 min;

[0038] S2), after cleaning the oil-removed plating piece with deionized water, put it into a roughening solution composed of sulfuric acid 400 g / L, potassium permanganate 100 g / L, and potassium dichromate 80 g / L, and roughen at 80°C for 20 min;

[0039] S3), after the roughening of the plated parts is washed with deionized water, put into the sensitizing solution composed of stannous chloride 10g / L, concentrated hydrochloric acid 100ml / L, and sensitized at 25°C for 10 minutes;

[0040] S4), after the sensitized plated parts are washed with deionized water, put into the activation solution of 100ppm palladium chloride, and activated at 25°C for 3 minutes;

[0041] S5), after the activated plated parts are washed with deionized water, put into the pre-dipping solution composed of sodium hypophosphite 50g / L, sodium alginate 2g / L, and pre-dipped at 25°C for 3 minutes;

[0042] S6), after the pre-dipped plated parts are not washed with water, directly put into the nickel plating solution composed of nickel sulfate 20g / L, sodium hypophosphite 25g / L, anhydrous sodium acetate 5g / L, lactic acid 10ml / L, sodium citrate 10g / L, and sodium succinate 5g / L, and plated with nickel at 82°C for 8 minutes.

[0043] Example 2

[0044] The embodiment provides a pre-dipping method for enhancing the surface chemical nickel plating binding force of a polyester material, comprising the following steps:

[0045] S1), after the plated parts are washed with deionized water, put into the oil removal solution composed of sodium hydroxide 10g / L and sodium bicarbonate 20g / L, and remove oil at 50°C for 15 minutes;

[0046] S2), after the oil-removed plated parts are washed with deionized water, put into the roughening solution composed of sulfuric acid 400g / L, potassium permanganate 100g / L and potassium dichromate 80g / L, and roughened at 80°C for 20 minutes;

[0047] S3), after the roughened plated parts are washed with deionized water, put into the sensitizing solution composed of stannous chloride 10g / L and concentrated hydrochloric acid 100ml / L, and sensitized at 25°C for 10 minutes;

[0048] S4), after the sensitized plated parts are washed with deionized water, put into the activation solution of 100ppm palladium chloride, and activated at 25°C for 3 minutes;

[0049] S5), after the activated plated parts are washed with deionized water, put into the pre-dipping solution composed of sodium hypophosphite 50g / L and polyvinylpyrrolidone (PVP) 5g / L, and pre-dipped at 25°C for 3 minutes;

[0050] S6), the pre-dipped plated parts are not washed with water, and are directly put into a nickel plating solution composed of nickel sulfate 20 g / L, sodium hypophosphite 25 g / L, anhydrous sodium acetate 5 g / L, lactic acid 10 ml / L, sodium citrate 10 g / L, and sodium succinate 5 g / L, and nickel plating is carried out at 82°C for 8 min.

[0051] Example 3

[0052] The embodiment provides a pre-dipping method for enhancing the chemical nickel plating binding force of a polyester material surface, and comprises the following steps:

[0053] S1), after the plated parts are cleaned with deionized water, they are put into a degreasing solution composed of sodium hydroxide 10 g / L and sodium bicarbonate 20 g / L, and degreasing is carried out at 50°C for 15 min;

[0054] S2), after the degreased plated parts are cleaned with deionized water, they are put into a roughening solution composed of sulfuric acid 400 g / L, potassium permanganate 100 g / L, and potassium dichromate 80 g / L, and roughening is carried out at 80°C for 20 min;

[0055] S3), after the roughened plated parts are cleaned with deionized water, they are put into a sensitizing solution composed of stannous chloride 10 g / L and concentrated hydrochloric acid 100 ml / L, and sensitizing is carried out at 25°C for 10 min;

[0056] S4), after the sensitized plated parts are cleaned with deionized water, they are put into a 100 ppm palladium chloride activation solution, and activation is carried out at 25°C for 3 min;

[0057] S5), after the activated plated parts are cleaned with deionized water, they are put into a pre-dipping solution composed of sodium hypophosphite 50 g / L and sodium dodecyl benzene sulfonate (SDS) 3 g / L, and pre-dipping is carried out at 25°C for 3 min;

[0058] S6), the pre-dipped plated parts are not washed with water, and are directly put into a nickel plating solution composed of nickel sulfate 20 g / L, sodium hypophosphite 25 g / L, anhydrous sodium acetate 5 g / L, lactic acid 10 ml / L, sodium citrate 10 g / L, and sodium succinate 5 g / L, and nickel plating is carried out at 82°C for 8 min.

[0059] Example 4

[0060] The embodiment provides a pre-dipping method for enhancing the chemical nickel plating binding force of a polyester material surface, and comprises the following steps:

[0061] S1), after the plated parts are cleaned with deionized water, they are put into a degreasing solution composed of sodium hydroxide 10 g / L and sodium bicarbonate 20 g / L, and degreasing is carried out at 50°C for 15 min;

[0062] S2) After the oil removal of the plated parts, the parts are cleaned with deionized water, and then put into a roughening solution composed of sulfuric acid 400 g / L, potassium permanganate 100 g / L, and potassium dichromate 80 g / L, and roughened at 80°C for 20 min;

[0063] S3) After the roughening of the plated parts, the parts are cleaned with deionized water, and then put into a sensitizing solution composed of stannous chloride 10 g / L and concentrated hydrochloric acid 100 ml / L, and sensitized at 25°C for 10 min;

[0064] S4) After the sensitizing of the plated parts, the parts are cleaned with deionized water, and then put into a 100 ppm palladium chloride activation solution, and activated at 25°C for 3 min;

[0065] S5) After the activation of the plated parts, the parts are cleaned with deionized water, and then put into a pre-dipping solution composed of sodium hypophosphite 50 g / L and KI 8 g / L, and pre-dipped at 25°C for 3 min;

[0066] S6) After the pre-dipping of the plated parts, the parts are directly put into a nickel plating solution composed of nickel sulfate 20 g / L, sodium hypophosphite 25 g / L, anhydrous sodium acetate 5 g / L, lactic acid 10 ml / L, sodium citrate 10 g / L, and sodium succinate 5 g / L, and nickel plated at 82°C for 8 min.

[0067] Example 5

[0068] The present embodiment serves as a comparative example, and includes the following steps:

[0069] S1) After the cleaning of the plated parts with deionized water, the parts are put into a degreasing solution composed of sodium hydroxide 10 g / L and sodium bicarbonate 20 g / L, and degreased at 50°C for 15 min;

[0070] S2) After the oil removal of the plated parts, the parts are cleaned with deionized water, and then put into a roughening solution composed of sulfuric acid 400 g / L, potassium permanganate 100 g / L, and potassium dichromate 80 g / L, and roughened at 80°C for 20 min;

[0071] S3) After the roughening of the plated parts, the parts are cleaned with deionized water, and then put into a sensitizing solution composed of stannous chloride 10 g / L and concentrated hydrochloric acid 100 ml / L, and sensitized at 25°C for 10 min;

[0072] S4) After the sensitizing of the plated parts, the parts are cleaned with deionized water, and then put into a 100 ppm palladium chloride activation solution, and activated at 25°C for 3 min;

[0073] S5), the sensitized plating parts are not washed by water, and are directly put into a nickel plating solution composed of nickel sulfate 20 g / L, sodium hypophosphite 25 g / L, anhydrous sodium acetate 5 g / L, lactic acid 10 ml / L, sodium citrate 10 g / L, and sodium succinate 5 g / L, and are plated with nickel at 82°C for 8 min.

[0074] From Figs. 1-3 It can be seen from the above that the pre-dip of Example 1 and Example 2 has the best improvement on the brightness and flatness of the plated layer. Example 3 is the second, and Example 4 is also improved, but the surface has many pitting. The plated layer of Example 1 is bright and flat without black spots, Example 2 has a few black spots, Example 3 has more and larger black spots, Example 4 has raised particles, and the bonding force is the worst, while the plated layer of Example 5 directly cracks. The 3M adhesive tape is pasted on the plated layer, and the tape is pulled to observe whether the plated layer falls off. It can be seen that the plated layer of Example 1 does not fall off, Example 2 has a very small amount of falling off, Example 3 has a large area of small particles falling off, Example 4 has more large pieces falling off, and Example 5 has a large area of large pieces falling off.

[0075] The above examples and descriptions in the specification are only to illustrate the principles and the best mode of the present application, and the present application can have various changes and improvements without departing from the spirit and scope of the present application. These changes and improvements all fall within the scope of the present application.

Claims

1. A method for enhancing the surface chemical nickel plating bonding force of a polyester material by pre-dipping, characterized in that, The process comprises the following steps: S1), after the plating parts are cleaned with deionized water, they are put into the oil removing liquid to remove oil at 50-70℃ for 5-15min; S2), after the oil removed plating parts are cleaned with deionized water, they are put into the roughening liquid to roughen at 60-80℃ for 10-20min; S3), after the roughened plating parts are cleaned with deionized water, they are put into the sensitizing liquid to sensitize at 25-30℃ for 5-10min; S4), after the sensitized plating parts are cleaned with deionized water, they are put into the palladium chloride activating liquid to activate at 25-30℃ for 1-5min; S5), after the activated plating parts are cleaned with deionized water, they are put into the pre-impregnation liquid to pre-impregnate at 25-30℃ for 2-5min; S6), after the pre-impregnated plating parts are not cleaned with water, they are directly put into the nickel plating liquid to plate nickel at 80-85℃ for 5-10min; Step S2), the roughening liquid comprises sulfuric acid 300-400g / L, potassium permanganate 80-100g / L, potassium dichromate 80-100g / L; Step S5), the pre-impregnation liquid is mixed with component A and component B at a volume ratio of 1:1; Step S5), in the pre-impregnation liquid, component A is sodium hypophosphite 50g / L; component B is sodium alginate 2g / L.

2. The method of claim 1, wherein the method is characterized by: Step S1), the oil removing liquid comprises the following components: Sodium hydroxide 10-20g / L; Sodium bicarbonate 20-30g / L.

3. The method of claim 1, wherein the method is characterized by: Step S3), the sensitizing liquid comprises stannous chloride 8-12g / L, concentrated hydrochloric acid 80-120ml / L.

4. The method of claim 1, wherein the method is characterized by: Step S4), the activating liquid is 50-100ppm palladium chloride solution.

5. The method of claim 1, wherein the method is characterized by: Step S6), the nickel plating liquid is nickel sulfate 15-20g / L, sodium hypophosphite 20-30g / L, anhydrous sodium acetate 3-8g / L, lactic acid 5-10ml / L, sodium citrate 5-10g / L, sodium succinate 3-8g / L.

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