Special strippable protection glue for hard chromium plating
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A strippable, protective adhesive technology, applied in the direction of coating, etc., can solve the problems of decreased adhesive film adhesion in the boundary area, part processing failure, leakage corrosion damage to the substrate, etc.
Active Publication Date: 2016-03-23
中昊北方涂料工业研究设计院有限公司
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Problems solved by technology
At present, hard chrome plating protective coatings at home and abroad are difficult to meet the requirements of its actual use.
In the case of long-term immersion in high-temperature chromic acid solution and electrification, the requirements for hard chrome plating protective coating are very high. The general hard chromium plating protective coating has poor acid resistance, and it will dissolve when soaked in chromic acid solution for a long time. The phenomenon of poll
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Embodiment 1
[0027] 1. Synthetic thermoplastic acrylic resin
[0028] Add 120g of xylene into a three-necked flask with stirring, a thermometer and a dropping funnel, heat to reflux at 130-140°C, and keep the temperature constant.
[0029] Dissolve 9g of BPO completely with 60g of xylene, then add 190g of isobornyl methacrylate and 10g of phosphate acrylate, and stir evenly. Pour the above mixture into the dropping funnel, drop it into the three-necked flask at a constant speed, and control the dropping within three hours. Keep warm for one hour.
[0030] Dissolve 0.5g of BPO with 20g of xylene completely. Pour the above mixture into the dropping funnel, drop it into the three-necked flask at a constant speed, and control the dropping in half an hour. Keep warm for one hour.
[0031] Dissolve 0.5g of BPO with 20g of xylene completely. Pour the above mixture into the dropping funnel, drop it into the three-necked flask at a constant speed, and control the dropping in half an hour. Kee...
Embodiment 2
[0040] Take by weighing 13g SEBS resin and 1.2g hydrogenated C5 petroleum resin resin, add 29.5g toluene and 29.5g xylene, make it dissolve completely, then add prepared acrylic resin 8.2g, 4.0g white carbon black, 2.8g talc powder, 3.0g chromium oxide green, 0.6g BYK-066N, 0.5g YCK-2160, 3.8g toluene and 3.9g xylene, after mixing evenly, go to the grinding and dispersing machine to grind and disperse, add 0.4g BYK-410 during the grinding and dispersing process, grind The fineness is less than 35 microns, and it is made into a special peelable protective glue for hard chrome plating.
[0041] Coat the peelable protective glue specially made for hard chrome plating on the parts that need to be chrome-plated, and conduct a chrome-plating test after drying for 20 hours.
[0042] The test performance results are as follows:
[0043]
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Abstract
The invention provides a temporary protection coating which can be resistant to high-temperature chromic acid solution for a long time under the powered-on condition, cannot bubble, cannot be dissolved, cannot automatically fall off, has good control performance on a final etching ratio and has good strippable performance after a hard chromium plating process is finished. According to the invention, low-molecular-weight tackifying resin containing phosphate ester groups is synthesized through a polymerization reaction of isobornyl methacrylate and acrylic phosphate during synthesis of thermoplastic acrylic resin, the adhesive force with a base material is increased, and then the matching ratio with hydrogenated hydrocarbon petroleum resin with good initial adhesion is optimized, so that the tackifying resin has the adhesive force which is high under the hot condition and low under the cold condition; the tackifying resin is matched with SEBS (Styrene-ethylene-butylene-styrene block copolymer) resin with good chromic acid resistance and high temperature resistance in certain proportion, accordingly, the electroplating protection glue can keep good flexibility and excellent adhesive force in a long-term electroplating process, and use requirements of the hard chromium plating process under different conditions are met.
Description
technical field [0001] The invention relates to an electroplating protective glue, in particular to a peelable protective glue specially used for hard chrome plating. Background technique [0002] The strippable protective adhesive for hard chrome plating has good long-term resistance to high temperature chromic acid solution, will not fall off and dissolve in chromic acid solution, pollute the plating solution, and has good strippability after the hard chrome plating process performance. It has a good control performance on the etching ratio of the plating area, and there will be no overplating phenomenon, which fully meets the process requirements of hard chromium plating. [0003] Use the characteristics of chromium to improve the hardness, wear resistance, temperature resistance and corrosion resistance of parts. Hard chrome plating is often used to coat a layer of chromium metal on the surface of parts. The special peelable protective glue for hard chrome plating can p...
Claims
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Application Information
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