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CN-121992681-A - Environment-friendly recyclable modified urea-formaldehyde resin backing plate and preparation process and application thereof

CN121992681ACN 121992681 ACN121992681 ACN 121992681ACN-121992681-A

Abstract

The invention discloses a modified urea-formaldehyde resin environment-friendly recyclable backing plate and a preparation process and application thereof, and the preparation process of the modified urea-formaldehyde resin environment-friendly recyclable backing plate comprises the following steps of dipping and baking semi-finished backing plate recycling paper, balance paper and bleached paper by adopting modified urea-formaldehyde resin, and then pressing plates by adopting a press after the dipping paper is matched in number, so that the backing plate is obtained, wherein the modified urea-formaldehyde resin is urea-formaldehyde resin modified by sugar alcohol substances, and the sugar alcohol substances account for 30-60% of the total resin solid amount. The modified urea-formaldehyde resin environment-friendly recyclable backing plate prepared by the preparation process has the characteristics of high hardness and excellent drilling performance, is high in water solubility, can be recycled, can reduce the long-term manufacturing cost of the drilling backing plate, has environment friendliness, can adapt to market demands, and is widely applied.

Inventors

  • HUANG HONGXI
  • TANG MINGMING
  • ZHANG LUNQIANG
  • HU HAIBO
  • ZHOU YONGFEI
  • HUANG YUNZHONG
  • YANG LIU

Assignees

  • 深圳市柳鑫实业股份有限公司
  • 湖南柳鑫电子新材料有限公司

Dates

Publication Date
20260508
Application Date
20260227

Claims (10)

  1. 1. The preparation process of the modified urea-formaldehyde resin environment-friendly recyclable backing plate is characterized by comprising the following steps of: Dipping and baking the recycled paper, balance paper and bleached paper of the backing plate semi-finished product by adopting modified urea-formaldehyde resin, and then pressing the dipped paper by adopting a press after the quantity matching of the dipped paper to obtain the backing plate; wherein the modified urea-formaldehyde resin is urea-formaldehyde resin modified by 30-60% sugar alcohol substances, and the sugar alcohol substances account for 30-60% of the total resin solids.
  2. 2. The preparation process according to claim 1, wherein the sugar alcohol is any one of sorbitol, maltitol, xylitol, erythritol, and isomalt.
  3. 3. The manufacturing process according to claim 1, wherein the thickness of the pad is 1.0-3.0 mm.
  4. 4. The process according to claim 1, wherein the modified urea-formaldehyde resin has a solids content of 40-60%.
  5. 5. The process of claim 1, wherein the pressing plate is operated at a press forming temperature of 100-130 ℃, a pressure of 20-30 MPa, and a pressing time of 30-90 min.
  6. 6. The preparation process according to claim 1, wherein the preparation method of the modified urea-formaldehyde resin comprises the following steps: Adding urea, 37wt% formaldehyde aqueous solution and methanol into a reaction vessel for reaction to obtain urea-formaldehyde resin, adding sugar alcohol substances, uniformly stirring, and cooling to normal temperature to obtain modified urea-formaldehyde resin; Wherein the molar ratio of the formaldehyde aqueous solution to the urea is (1.2-1.6): 1.
  7. 7. The modified urea-formaldehyde resin environment-friendly recyclable backing plate prepared by the preparation process of any one of claims 1-6.
  8. 8. The urea-formaldehyde resin environment-friendly recyclable backing plate as claimed in claim 7, wherein the backing plate has a shore hardness of 80HD or more and a pencil hardness of 6H or more.
  9. 9. The use of the modified urea-formaldehyde resin environment-friendly recyclable mat of claim 8 as a PCB drilling mat or a modified urea-formaldehyde resin mat for repeated recycling.
  10. 10. The recycling method for the application of the modified urea-formaldehyde resin environment-friendly recyclable backing plate in repeated recycling is characterized by comprising the following steps of soaking the modified urea-formaldehyde resin environment-friendly recyclable backing plate in water, decomposing the modified urea-formaldehyde resin environment-friendly recyclable backing plate into water-soluble resin and paper pulp, adding the water-soluble resin and the paper pulp into normal paper pulp, making the paper pulp into recycled paper through a paper making process, recycling the recycled paper into the raw material of the backing plate, and using the recycled paper as an inner paper dipping press fit of the backing plate to be used in the backing plate for repeated recycling.

Description

Environment-friendly recyclable modified urea-formaldehyde resin backing plate and preparation process and application thereof Technical Field The invention relates to the technical field of drilling processing of printed circuit boards, in particular to a modified urea-formaldehyde resin environment-friendly recyclable backing plate, and a preparation process and application thereof. Background With the development of high integration, high density and high reliability of Printed Circuit Boards (PCBs), drilling application pads such as urea pads and phenolic pads in the middle-high-end PCB field are widely used. However, after the base plates are drilled, the base plates are difficult to recycle and have the problem of high treatment cost, and the base plates are a great challenge to environmental protection. The urea resin laminated backing plate is an economical and practical material choice in many fields due to the characteristics of high hardness, wear resistance, heat resistance, chemical resistance, easiness in processing, decoration and the like. Under the environmental protection regulations (such as European Union waste frame instructions, chemical registration, evaluation, permission and restriction regulations, and the like) which are becoming stricter in green manufacturing and recycling economy wave and worldwide, the recyclability and disposal of urea-formaldehyde resin backing plate materials become one of the key problems to be solved for the sustainable development of urea-formaldehyde resin backing plates. However, the urea-formaldehyde resin backing plate still is a mixture of thermosetting resin and paper fiber due to the fact that the crushed fragments are not melted and re-granulated, the fragments can only be used as low-value fillers, the performance is far lower than that of raw materials, the application range is extremely limited, the market acceptance is low, and recycling is difficult to achieve. Therefore, under the remarkable improvement of environmental protection and health consciousness of consumers and the increasing global demand for recyclable and biodegradable materials, the defect that urea-formaldehyde resin cannot be recycled makes the disadvantage of the urea-formaldehyde resin laminated backing plate in the aspect of environmental protection more remarkable. Therefore, there is a need for a low cost and environmentally friendly preparation process that allows for the recycling of urea formaldehyde resin mats to meet market demands. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a modified urea-formaldehyde resin environment-friendly recyclable backing plate, and a preparation process and application thereof. The invention provides a preparation process of a modified urea-formaldehyde resin environment-friendly recyclable backing plate, which comprises the following steps: Dipping and baking the recycled paper, balance paper and bleached paper of the backing plate semi-finished product by adopting modified urea-formaldehyde resin, and then pressing the dipped paper by adopting a press after the quantity matching of the dipped paper to obtain the backing plate; Wherein the modified urea-formaldehyde resin is urea-formaldehyde resin modified by sugar alcohol substances, and the sugar alcohol substances account for 30-60% of the total resin solids. If the proportion of sugar alcohol substances is too low, the water solubility of the product is poor, the product is difficult to be decomposed into water-soluble resin and paper pulp after being soaked in water, namely the water-soluble resin and paper pulp are difficult to recycle, and if the proportion of sugar alcohol substances is too high, the proportion of urea-formaldehyde resin is too low, the curing time is shortened, the control window of the drying process is too narrow, and the problem of bubbling easily occurs when the pressing plate is baked too much. The inventor finds that the glue solution prepared by using the sugar alcohol substance to modify urea-formaldehyde resin contains more hydroxyl groups, the hydrophilicity of the backing plate prepared by using the glue solution is greatly improved, the original surface high hardness (pencil hardness is more than or equal to 6H and Shore hardness is more than or equal to 80 HD) can be reserved compared with other hydrophilic substances (polyether and the like) due to the fact that the sugar alcohol substance has higher hardness, the modified urea-formaldehyde resin is used for dipping and baking backing plate semi-finished products such as recycled paper, balance paper and bleached paper, and the like, the backing plate is prepared by matching the quantity according to the required thickness, the original surface hardness can be reserved for the backing plate, the PCB drilling resistance performance is excellent, meanwhile, the sugar alcohol substance has higher high-temperature heat storage characteristic (the phase tra