阅读说明：本技术 一种环境友好型液晶高分子聚合物器件化学镀前表面粗化方法 (Surface roughening method before chemical plating of environment-friendly liquid crystal high polymer device ) 是由 史兴岭 任建 徐玲利 王宇鑫 于 2020-11-27 设计创作，主要内容包括：本发明公开了一种环境友好型液晶高分子聚合物器件化学镀前表面粗化方法,包括如下步骤：将液晶高分子聚合物(LCP)材料放入过硫酸钾粗化液中,通入臭氧,在超声波作用下进行粗化处理；将经粗化处理后的液晶高分子聚合物放入脱氧化剂溶液中,后取出清洗,得到粗化表面。本发明以低浓度过硫酸钾为粗化液,结合臭氧的开环氧化和超声波的空化破碎作用对复合材料表面进行粗化处理,所采用的的工艺方法和配方环境友好,无易燃易爆、致癌溶剂,无高温高压操作,采用电镀厂常规设备,操作步骤简单,效果良好,特别适合电子、通讯、微机电领域LCP器件大规模表面粗化处理。(The invention discloses a surface roughening method before chemical plating of an environment-friendly liquid crystal high polymer device, which comprises the following steps: putting a Liquid Crystal Polymer (LCP) material into a potassium persulfate roughening solution, introducing ozone, and roughening under the action of ultrasonic waves; and putting the liquid crystal high molecular polymer subjected to the roughening treatment into a deoxidizing agent solution, taking out and cleaning to obtain a roughened surface. According to the invention, low-concentration potassium persulfate is used as a roughening liquid, and the ring-opening oxidation of ozone and the cavitation crushing effect of ultrasonic waves are combined to roughen the surface of the composite material, the adopted process method and formula are environment-friendly, no flammable and explosive carcinogenic solvent is used, no high-temperature and high-pressure operation is used, conventional equipment of an electroplating plant is adopted, the operation steps are simple, the effect is good, and the method is particularly suitable for large-scale surface roughening treatment of LCP devices in the fields of electronics, communication and micro electro mechanical systems.)

1. A surface roughening method before chemical plating of an environment-friendly liquid crystal high polymer device is characterized by comprising the following steps:

(1) putting the liquid crystal high molecular polymer into a potassium persulfate roughening solution, introducing ozone, and roughening under the action of ultrasonic waves;

(2) and putting the liquid crystal high molecular polymer subjected to the roughening treatment into a deoxidizing agent solution, taking out and cleaning to obtain a roughened surface.

2. The method for roughening the surface of the environment-friendly liquid crystal high molecular polymer device before electroless plating according to claim 1, wherein the method comprises the following steps: the coarsening time is 4-12 hours, and the coarsening temperature is 20-90 ℃.

3. The method for roughening the surface of the environment-friendly liquid crystal high molecular polymer device before electroless plating according to claim 1, wherein the method comprises the following steps: the concentration of the potassium persulfate is 0.5-2 mol/L.

4. The method for roughening the surface of the environment-friendly liquid crystal high molecular polymer device before electroless plating according to claim 1, wherein the method comprises the following steps: the deoxidizing agent solution is 0.1-0.5 mol/L oxalic acid solution.

5. The method for roughening the surface of the environment-friendly liquid crystal high molecular polymer device before electroless plating according to claim 1, wherein the method comprises the following steps: in the step (2), the liquid crystal high molecular polymer after the roughening treatment is put into a deoxidizing agent solution for treatment at the temperature of 20-30 ℃ for 3-5 minutes.

6. The method for roughening the surface of the environment-friendly liquid crystal high molecular polymer device before electroless plating according to claim 1, wherein the method comprises the following steps: ozone is prepared by an ozone machine and is introduced into the roughening liquid through a rubber conduit, and the air source of the ozone is air.

7. The method for roughening the surface of the environment-friendly liquid crystal high molecular polymer device before electroless plating according to claim 1, wherein the method comprises the following steps: the ozone introducing speed is 10-100L/min.

8. The method for roughening the surface of the environment-friendly liquid crystal high molecular polymer device before electroless plating according to claim 1, wherein the method comprises the following steps: the deoxidizing agent solution is oxalic acid solution or formic acid solution.

Technical Field

The invention relates to a surface treatment method, in particular to a surface roughening method for a liquid crystal high polymer.

Background

In recent years, Liquid Crystal Polymers (LCP) have excellent physical and chemical properties, such as heat resistance, corrosion resistance, low cost, low loss of high-frequency electromagnetic signals, large frequency range of use, stable dielectric constant, high strength, light weight and good injection molding performance; therefore, the injection molding material is increasingly widely applied to the fields of micro-electro-mechanical systems, electric power systems, electronics systems, communication systems, navigation positioning systems, reconnaissance systems, electronic countermeasure systems and the like. The LCP material surface is coated with metal to prepare a material with integrated structure and function, and the material can replace the original metal parts, wherein two processes of copper foil coating of the LCP material and surface chemical copper plating and nickel plating of the LCP material are the most common. LCP material and metal coating belong to the xenogenesis material and connect, and bonding strength between them is very important, and in order to increase intensity, LCP material surface coarsening is indispensable one-step process.

The existing surface roughening methods of engineering plastics can be generally divided into physical roughening and chemical roughening, for LCP, the physical roughening methods with better effects comprise sand blasting, ultraviolet laser processing, plasma etching and the like, and are all suitable for parts with regular shapes and large flat plate areas, the cost is high, and the mass production efficiency is low. The circuit board, the shell and the like in the field of electronic and communication products are small in surface area, complex in shape, and have structures such as pins and blind holes, the efficiency of using sand blasting and laser roughening is low, blind areas exist, damage to microstructures is easily caused, the yield of products is reduced, and the cost is increased. Therefore, physical roughening has certain limitations. For chemical coarsening, due to the good chemical corrosion resistance of LCP materials, the pure coarsening of potassium permanganate and chromic anhydride in the traditional ABS plastic chemical copper plating process does not work on the LCP materials, and a coarsening liquid system taking the potassium permanganate and the chromic anhydride as cores has serious pollution to the environment and does not meet the development trend of green and environment protection of the current industry. In view of this, it is necessary to develop a new and environmentally friendly surface chemical roughening method for LCP. Therefore, few chemical roughening methods for LCP materials are reported, and basically a three-step process of swelling-etching-neutralizing is adopted. It has the following problems: (1) flammable and explosive organic solvents such as ethylene glycol monomethyl ether and the like are needed in the swelling stage, wherein N-dimethylformamide is also a 2A carcinogen, and when swelling treatment is carried out at the temperature of more than 50 ℃, the requirements on personal protection and production safety are extremely high; (2) in the corrosion stage, a high-concentration potassium permanganate-strong base mixed solution is used, potassium permanganate is a strong oxidant, the contact of an organic solvent has explosion danger, the management cost and the risk are increased, most importantly, manganese is heavy metal, and the current electroplating park generally requires the potassium permanganate wastewater to be separately stored and treated, so that the production cost is increased. Therefore, it is necessary to develop a chemical roughening method for the surface of an environment-friendly liquid crystal polymer.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the defects in the prior roughening technology, the invention aims to provide the surface roughening method before chemical plating of the environment-friendly liquid crystal high polymer device, the roughening effect is good, the surface roughening treatment before chemical plating of electronic, communication and micro-electro-mechanical devices can be met, the roughening process is simple, and the related reagents are environment-friendly, non-toxic and easy to treat.

The technical scheme is as follows: the invention provides an environment-friendly surface roughening method before chemical plating of a liquid crystal high molecular polymer device, which comprises the following steps:

(1) putting the cleaned liquid crystal high molecular polymer into a potassium persulfate coarsening liquid, introducing ozone, and performing coarsening treatment under the action of ultrasonic waves; namely, the wastewater is immersed into a potassium persulfate coarsening solution, ozone is introduced, and coarsening treatment is completed under ultrasonic oscillation.

(2) And (3) placing the liquid crystal high molecular polymer subjected to roughening treatment into a deoxidizing agent solution to remove residual oxidizing agents on the surface, taking out the liquid crystal high molecular polymer, and washing the liquid crystal high molecular polymer with deionized water to obtain a roughened surface.

After the roughening treatment, the surface roughness of the LCP is obviously increased, and the bonding strength of the chemical copper plating layer after activation is obviously improved. The deoxidizing agent solution can be selected from oxalic acid solution or formic acid solution, and is prepared from oxalic acid or formic acid and deionized water.

Preferably, in the step (1), the coarsening time is 4-12 hours, and the coarsening temperature is 20-90 ℃.

Preferably, in the step (1), the roughening solution is prepared from potassium persulfate and deionized water, wherein the concentration of the potassium persulfate is 0.5-2 mol/L.

Wherein, ozone is prepared by an ozone machine and is introduced into the roughening liquid through a silicon rubber conduit, and the air source of the ozone is air. The real-time introduction amount of ozone can be adjusted according to actual process requirements, and generally, when ozone is introduced, the ozone can be bubbled below the liquid level to ensure the dissolution saturation. Preferably, the ozone is introduced at a rate of 10 to 100L/min.

Preferably, in the step (2), the liquid crystal high molecular polymer after the roughening treatment is put into a deoxidizing agent solution for treatment at the temperature of 20-30 ℃ for 3-5 minutes; the deoxidizing agent solution is 0.1-0.5 mol/L oxalic acid solution.

Two key technical links of the invention are selection of the coarsening liquid and control of the coarsening process respectively, and the two links supplement each other. The invention adopts a chemical roughening method, realizes the surface roughening of the engineering plastic through chemical etching, and simultaneously improves the hydrophilicity of the material, so that the material is changed from hydrophobicity to hydrophilicity, thereby providing anchor points for subsequent copper foil or plating, and obviously improving the bonding strength between the substrate and the metal coating. The corrosion resistance of LCP is obviously stronger than that of ABS material, and the surface roughening difficulty is extremely high; according to the method, low-concentration potassium persulfate is used as the coarsening liquid, and the potassium persulfate environment which is slightly acidic can directly introduce a carbonyl functional group onto a molecular framework of an LCP aromatic ring compound, so that the polarity is increased, the hydrophilicity is improved, and the next step of activation is facilitated; and the surface of the composite material is roughened by combining the ring-opening oxidation of ozone and the cavitation and crushing action of ultrasonic waves. The adopted process method and formula are environment-friendly, free of flammable and explosive solvents and carcinogenic solvents, free of high-temperature and high-pressure operation, simple in operation steps and good in effect, and is particularly suitable for surface roughening treatment of large-batch products. In addition, the treatment method can generate cavitation corrosion pits, can prolong the LCP surface roughening time according to the actual production requirement to realize better roughened surface, and does not bring other adverse effects to the surface.

The oxidation capacity (electrode potential is 2.076V) of ozone is much stronger than that of potassium permanganate (electrode potential is 1.679V), so that the aromatic compound can be subjected to ring-opening oxidation, and the ozone is an environment-friendly strong oxidant and can be completely degraded into oxygen through manganese dioxide catalysis. Ultrasonic wave can generate strong cavitation and breaking action to make the reaction gradually go deep into the interior of the base body from the surface of the material, and the action of the ultrasonic wave and corrosive agent can generate holes with larger size and depth on the surface of the material. The invention provides a surface chemical roughening method for the surface of a liquid crystal high polymer by combining ring-opening oxidation of ozone and cavitation and crushing of ultrasonic waves.

Compared with the prior LCP material surface roughening technology, the method has the following beneficial effects:

(1) the method can play an obvious coarsening role on the LCP surface, and does not use flammable and explosive organic solvents with carcinogenic risks; and the potassium permanganate solution which contains heavy metal ions and is forbidden to be directly discharged is not used.

(2) The corrosion reagent used in the invention is potassium persulfate solution with relatively low concentration, the post-treatment is simple and easy to implement, and the method has obvious cost advantage and is particularly suitable for large-scale surface roughening treatment of liquid crystal polymer plastics.

(3) The method provided by the invention has very simple operation steps, uses conventional equipment of electroplating, chemical plating and pickling workshops, does not relate to high-temperature and high-pressure operation, and is particularly suitable for production and application of enterprises.

(4) The method is not only suitable for surface roughening treatment of common LCP plate parts, but also suitable for parts with small surface area and complex shapes, does not involve dangerous reagents in the treatment process, and has good roughening effect.

(5) Compared with the prior art, the invention has the advantages of mild reaction process and controllable reaction degree, is particularly suitable for product structures with fine structures (such as communication devices, pins or apertures are only dozens or hundreds of micrometers), does not swell in the coarsening process, and has small influence on final size.

Drawings

FIG. 1 is SEM picture of initial surface topography of LCP material;

FIG. 2 is the LCP material initial surface contact angle measurement results;

FIG. 3 is an SEM picture of the surface morphology of the roughened LCP material in example 1;

FIG. 4 is the surface contact angle measurement result of the LCP material after surface roughening in example 1;

FIG. 5 is a photomicrograph of the LCP antenna box cover of example 2;

FIG. 6 is an SEM picture of the surface morphology of the roughened LCP material in comparative example 1;

FIG. 7 is an SEM image of the surface appearance of the roughened LCP material in comparative example 3-1;

FIG. 8 is an SEM image of the surface morphology of the roughened LCP material in comparative example 3-2;

FIG. 9 is an SEM image of the surface appearance of the roughened LCP material in comparative example 3-3;

FIG. 10 is an SEM image of the surface morphology of the roughened LCP material in comparative example 4.

Detailed Description

The present invention will be described in further detail with reference to examples.

The starting materials and reagents used in the following examples and comparative examples are commercially available.

Example 1:

in this example, a flat LCP material was used to perform roughening treatment, and the length, width, height and dimension were 50mm × 50mmx1 mm.

The method for surface chemical roughening of the liquid crystal high molecular polymer comprises the following steps:

(1) washing the LCP material with absolute ethyl alcohol, and washing with deionized water;

(2) adding 1.0mol/L potassium persulfate solution into a reaction kettle, heating to 65 ℃, and keeping the temperature; immersing an air outlet pipe of an ozone generator into a potassium persulfate solution, opening the generator, and introducing ozone; putting an ultrasonic vibrating bar into the solution, and starting to vibrate; LCP is put into the potassium persulfate solution and treated for 8 hours under the combined action of ozone and ultrasonic waves; the ozone introduction rate in this example was 100L/min.

(3) Taking out LCP, washing with tap water, immersing in 0.1mol/L oxalic acid deoxidizing agent solution, and immersing for 2 minutes at room temperature (about 25 ℃); and taking out and washing the product by using distilled water to finish surface roughening treatment.

And (3) carrying out appearance observation, contact angle test and subsequent palladium activation and chemical copper plating treatment on the surface of the LCP material before and after coarsening by adopting a Scanning Electron Microscope (SEM).

Wherein the palladium activation adopts a conventional colloid palladium sensitization-activation one-step method for plastic and ceramic products, and Pd is in an acid solution²⁺And Sn²⁺And (3) generating colloid palladium particles with adsorbability by reaction, adsorbing the colloid palladium particles on the surface of the roughened plastic part, and forming a chemical plating activation center after peptizing.

Electroless copper plating adopts a classical formula: 5g/L of copper sulfate, 10mL/L of formaldehyde, 25g/L of potassium sodium tartrate, 0.1mg/L of EDTA0, 7g/L of sodium hydroxide, 12-13 of pH and 10 minutes of plating at 25 ℃.

The topography observation is shown in fig. 1 and 3, respectively, fig. 1 is an SEM picture of the initial surface topography of the LCP material, and fig. 3 is an SEM picture of the surface topography of the roughened LCP material in this embodiment. It can be seen that: before coarsening, the surface of the LCP material is relatively smooth, and the flowing trace of the polymer material can be seen in the extrusion molding process; and a large number of holes with different sizes are formed on the surface of the LCP material after the coarsening treatment, wherein the diameter of part of the holes reaches 50 mu m, the depth is about 20-30 mu m, and the surface roughness of the material is obviously increased.

The roughened LCP material was blow-dried, and hydrophilicity before and after roughening was evaluated by a contact angle measuring instrument, and the results are shown in fig. 2 and 4, where fig. 2 is the measurement result of the initial surface contact angle of the LCP material, and fig. 4 is the measurement result of the surface contact angle of the roughened LCP material in this example. It can be seen that: before coarsening, the LCP is a hydrophobic surface, the contact angle is as high as 135 degrees, after coarsening treatment, the contact angle is sharply reduced to 5 degrees, and the hydrophilicity of the material surface is obviously improved.

Carrying out subsequent chemical plating treatment on the roughened surface: after palladium activation, conventional electroless copper plating was performed on the LCP material surface before and after roughening, and the plating adhesion strength was measured by 3M tape stripping according to GBT9286-1998, with a result of grade 5 before roughening and a result of grade 1 after roughening. According to the standard, for general use, the grade 0 to 2 is satisfactory, and the plating adhesion can be considered to be acceptable.

Example 2:

this embodiment is the same as embodiment 1 basically, and the difference lies in that the LCP material adopts a certain company's liquid crystal high molecular polymer 5G antenna box apron as experimental sample, and this apron has flat region, stitch, through-hole, blind hole, quarter bend isotructure, and the structure is comparatively complicated. As shown in FIG. 5, the whole cover plate is trapezoidal, 5cm long and 3.5cm wide, the diameters of the pins and the blind holes are 0.5mm multiplied by 1mm, the pins and the blind holes are distributed all over the whole cover plate, and grooves with the depth of 1mm and the width of 2mm are arranged below the pins.

Cutting and sampling in each area after coarsening, and finding by SEM observation that the coarsening effect is consistent with that of the embodiment 1; and moreover, swelling does not occur in the coarsening process, the microstructure does not deform, the influence on the sizes of pins and holes is small, after coarsening, the cover plate and the microstructure of the box body can still be well matched, and the conditions of looseness and blocking do not occur. After palladium activation and copper plating, the plating adhesion strength was measured by 3M tape stripping, and the result was grade 1.

Comparative example 1:

this comparative example is substantially the same as example 1 except that the potassium persulfate solution of the step (2) was replaced with a 1mol/L NaOH solution.

After the treatment, SEM observation shows that the surface of the sample is in loose powder shape and no obvious pits appear, as shown in figure 6. The coating bonding strength was measured by 3M tape stripping, and the result was grade 5.

And the NaOH solution is replaced by 1mol/L KOH solution, and the treatment effect is consistent with that of the NaOH solution.

Comparative example 2:

this comparative example is substantially the same as example 1 except that the treatment of step (3) is removed and only the cleaning step of step (1) and the roughening treatment of step (2) are performed.

After the roughening treatment, the palladium is directly activated and plated with copper after being washed by a large amount of deionized water without being treated by an oxidant. The bonding strength of the plating was measured by 3M tape stripping, and the result was grade 2. However, it was observed that the brownish black colloidal palladium solution gradually became lighter in color during the activation process, and became transparent after 10 minutes from the activation, indicating that the colloidal palladium in the solution decomposed and the solution lost the activation ability. Colloidal palladium is expensive and decomposes upon activation at one time or causes significant losses to production.

And the palladium activation is to generate palladium nano particles on the surface of the plastic, and the nano particles can induce the reduction and deposition of copper ions or nickel ions in the chemical plating solution, so as to form a plating layer. For materials which do not have the induction capability, palladium activation is very effective, but palladium solution is expensive and accounts for 20-40% of the chemical plating cost.

Comparative example 3:

3 sets of comparative tests were designed, which were essentially the same as in example 1, except for step (1); marking as a comparative example 3-1, a comparative example 3-2 and a comparative example 3-3, wherein the specific differences of the step (1) are that ozone is not introduced in the coarsening process, ultrasonic vibration is not applied in the coarsening process and ozone is not introduced in the coarsening process.

And SEM observation and bonding performance test are carried out on the surface of the treated LCP, and SEM pictures are respectively shown in figures 7-9, and the results are shown in the following table 1.

Test results of Table 1, example 1 and comparative example 3

Comparative example 4:

this comparative example is substantially the same as example 1 except that the roughening treatment in step (2) was performed in deionized water, ozone was introduced, and ultrasonic oscillation was performed.

In the treated LCP material, SEM observation shows that the surface of the material is less roughened, mainly flaked, and no deep holes are formed, as shown in fig. 10. The coating bonding strength was measured by 3M tape stripping, and the result was grade 5.

Through the above examples and comparative examples, it can be seen that the surface chemical roughening method of the present invention increases the surface roughness and improves the wettability of LCP material; meanwhile, ozone, ultrasonic waves and potassium persulfate are indispensable factors for the roughening method.

Example 3:

the LCP material of this example was the same size as example 1.

The surface roughening method before the LCP material electroless plating comprises the following steps:

(1) washing the LCP material with absolute ethyl alcohol, and washing with deionized water;

(2) adding 1.5mol/L potassium persulfate solution into a reaction kettle, heating to 50 ℃, and keeping the temperature; immersing an air outlet pipe of an ozone generator into a potassium persulfate solution, opening the generator, and introducing ozone; putting an ultrasonic vibrating bar into the solution, and starting to vibrate; LCP is put into the potassium persulfate solution and treated for 4 hours under the combined action of ozone and ultrasonic waves;

(3) taking out LCP, washing with tap water, immersing in 0.2mol/L oxalic acid deoxidizing agent solution, and immersing for 3-5 minutes at 30 ℃; and taking out and washing the product by using distilled water to finish surface roughening treatment.

Observation and test are carried out on the coarsened LCP material: SEM observation shows that the surface of the material is obviously coarsened, but the coarsening degree is lower than the effect of the example 1, the main characteristics are deep pits with the diameter of 20-30 μ M and shallow delamination, the number of the pits and the shallow delamination is far less than that of the sample of the example 1, and the bonding strength of the plating layer is measured by a 3M tape stripping method, and the result is grade 2.

Example 4:

the LCP material of this example was the same size as example 2.

The surface roughening method before the LCP material electroless plating comprises the following steps:

(1) washing the LCP material with absolute ethyl alcohol, and washing with deionized water;

(2) adding 1.0mol/L potassium persulfate solution into a reaction kettle, heating to 75 ℃, and keeping the temperature; immersing an air outlet pipe of an ozone generator into a potassium persulfate solution, opening the generator, and introducing ozone; putting an ultrasonic vibrating bar into the solution, and starting to vibrate; LCP is put into the potassium persulfate solution and treated for 12 hours under the combined action of ozone and ultrasonic waves;

(3) taking out LCP, washing with tap water, immersing in 0.3mol/L oxalic acid deoxidizing agent solution, and immersing for 3-5 minutes at 20 ℃; and taking out and washing the product by using distilled water to finish surface roughening treatment.

Observation and test are carried out on the coarsened LCP material: SEM observation shows that the surface of the material is coarsened obviously, a large number of pits are formed, swelling does not occur in the coarsening process, the influence on the size is small, and the matching among the components is good; the bonding strength of the plating was measured by 3M tape stripping, and the result was grade 2.

Example 5:

the LCP material of this example was the same size as example 1.

The surface roughening method before the LCP material electroless plating comprises the following steps:

(1) washing the LCP material with absolute ethyl alcohol, and washing with deionized water;

(2) adding 2.0mol/L potassium persulfate solution into a reaction kettle, heating to 65 ℃, and keeping the temperature; immersing an air outlet pipe of an ozone generator into a potassium persulfate solution, opening the generator, and introducing ozone; putting an ultrasonic vibrating bar into the solution, and starting to vibrate; LCP is put into the potassium persulfate solution and treated for 4 hours under the combined action of ozone and ultrasonic waves;

(3) taking out LCP, washing with tap water, immersing in 0.4mol/L oxalic acid deoxidizing agent solution, and immersing for 3-5 minutes at 20 ℃; and taking out and washing the product by using distilled water to finish surface roughening treatment.

Observation and test are carried out on the coarsened LCP material: SEM observation shows that the surface of the material is obviously coarsened, a large number of pits and shallow peeling are formed, and the bonding strength of the coating is measured by a 3M adhesive tape stripping method, and the result is grade 1.

Example 6:

the LCP material of this example was the same size as example 2.

The surface roughening method before the LCP material electroless plating comprises the following steps:

(1) washing the LCP material with absolute ethyl alcohol, and washing with deionized water;

(2) adding 1.0mol/L potassium persulfate solution into a reaction kettle, heating to 90 ℃, and preserving heat; immersing an air outlet pipe of an ozone generator into a potassium persulfate solution, opening the generator, and introducing ozone; putting an ultrasonic vibrating bar into the solution, and starting to vibrate; LCP is put into the potassium persulfate solution and treated for 4 hours under the combined action of ozone and ultrasonic waves;

(3) taking out LCP, washing with tap water, immersing in 0.5mol/L oxalic acid deoxidizing agent solution, and immersing for 3-5 minutes at 25 ℃; and taking out and washing the product by using distilled water to finish surface roughening treatment.

Observation and test are carried out on the coarsened LCP material: SEM observation shows that the surface of the material is coarsened obviously, a large number of pits and shallow peeling are formed, swelling does not occur in the coarsening process, the influence on the size is small, and the matching among components is good; the bonding strength of the plating was measured by 3M tape stripping, and the result was grade 1.

Comparative example 5:

this comparative example is essentially the same as example 1, except that: in the step (2), the concentration of potassium persulfate is 2m_oL/L, the treatment temperature is 90 ℃, and the treatment time is 2 hours.

Observation and test are carried out on the coarsened LCP material: SEM observation shows that the bonding strength of the coating on the surface of the material is measured by a 3M tape stripping method, and the result is grade 3.

Table 2, examples 1-6 and comparative example 5 summarize the results

The test data of the above examples 1 to 6 and comparative example 5 are shown in table 2, wherein the process parameter conditions in the table only show the coarsening process parameters of step (2), and the specific parameters of step (3) are not shown; it can be seen that when the treatment method is adopted, the treatment time is too short, no obvious coarsening effect is generated, and after the treatment time exceeds a certain time, the bonding strength is not increased any more; researches find that the poly LCP material is treated in a coarsening agent for too long time, and the surface of the poly LCP material is embrittled due to oxidation, so that the bonding strength of a plating layer is reduced; when the concentration of potassium persulfate is increased and the roughening temperature is raised, the roughening time can be shortened appropriately.