CN-122011971-A - Solvent-resistant non-migration PVC adhesive and preparation method thereof

Abstract

The invention discloses solvent-resistant non-migration type PVC (polyvinyl chloride) adhesive and a preparation method thereof, and belongs to the field of PVC materials. The PVC adhesive comprises PVC resin, an adipate polyester plasticizer, a calcium zinc stabilizer and a functional auxiliary agent, wherein the adipate polyester plasticizer limits specific viscosity and acid value, the calcium zinc stabilizer and the functional auxiliary agent are compounded in a specific proportion, and the PVC resin is prepared by specific raw materials and processes. The preparation process includes heating, high speed stirring, primary plasticizing, filtering, secondary plasticizing, multi-roller gradient rolling and cooling. According to the invention, zero migration of the plasticizer is realized by optimizing the component proportion and the preparation process, the tolerance to various organic solvents is obviously improved, and meanwhile, the plasticizer has good mechanical properties and thermal stability, and is suitable for multi-solvent contact scenes such as medical treatment, laboratories, chemical industry and the like.

Inventors

• LI YONGPING
• LI ZHAOYUAN
• Li Zhaoyao
• LI FUHONG
• YAN TINGTING
• LIU YUYONG

Assignees

• 佛山威明塑胶有限公司

Dates

Publication Date

20260512

Application Date

20260130

Claims (10)

1. 1. The solvent-resistant non-migration PVC adhesive is characterized by comprising, by weight, 100 parts of PVC resin, 50-60 parts of adipate polyester plasticizer, 3-5 parts of calcium zinc stabilizer and 2-4 parts of functional auxiliary agent, wherein the viscosity of the adipate polyester plasticizer at 25 ℃ is 2300-3500 cps, and the acid value is less than or equal to 1 KOH mg/g.
2. 2. The solvent resistant non-migrating PVC glue of claim 1, wherein the adipate polyester plasticizer has a viscosity of 2800cps at 25 ℃ and an acid number of 0.5 KOH mg/g or less.
3. 3. The solvent-resistant non-migration type PVC adhesive according to claim 1, wherein the mass ratio of calcium salt to zinc salt in the calcium-zinc stabilizer is (2-3) to 1.
4. 4. The solvent-resistant non-migration PVC adhesive according to claim 1, wherein the functional auxiliary agent is butyl stearate and phenolic antioxidant, and the mass ratio of the butyl stearate to the phenolic antioxidant is (2-3) to 1.
5. 5. The solvent-resistant non-migrating PVC gum of claim 1, wherein the PVC resin has a polymerization degree of 1800-2200 and a K value of 75-82.
6. 6. The solvent-resistant non-migration PVC adhesive according to claim 5, wherein the PVC resin is prepared from the following raw materials, by mass, 100 parts of vinyl chloride monomer, 150-180 parts of desalted water, 0.1-0.2 part of particle modifier, 0.8-1.2 parts of composite emulsifier, 0.05-0.08 part of oil-soluble initiator, 0.03-0.05 part of chain transfer agent and 0.1-0.2 part of pH regulator.
7. 7. The solvent-resistant non-migration type PVC adhesive according to claim 6, wherein the composite emulsifier is a compound product of sorbitan monostearate and polyoxyethylene sorbitan monolaurate in a mass ratio of (2-3) to 1.
8. 8. The solvent resistant non-migrating PVC gum according to claim 6, wherein the particle modifier is calcium stearate, the oil soluble initiator is bis (2-ethylhexyl) peroxydicarbonate, the chain transfer agent is dodecyl mercaptan, and the pH adjustor is sodium bicarbonate aqueous solution.
9. 9. A preparation method of the solvent-resistant non-migration type PVC adhesive is characterized by comprising the steps of fully stirring raw materials, plasticizing the raw materials for the first time, filtering the plasticized materials for the second time, plasticizing the plasticized materials for the second time, and calendaring and cooling the plasticized materials for the second time to obtain the solvent-resistant non-migration type PVC adhesive according to any one of claims 1-8.
10. 10. The method for preparing the solvent-resistant non-migration type PVC adhesive according to claim 9, wherein the raw materials are stirred for 360-400 seconds at a temperature of 100-110 ℃ and a rotating speed of 1200-1500 r/min, the primary plasticizing temperature is 210-220 ℃ and the time is 300-320 seconds, the secondary plasticizing temperature is 190-200 ℃ and the time is 300-320 seconds, a multi-roller rolling process is adopted, wherein the temperature of a first roller is 220 ℃, the temperature of a second roller is 220 ℃, the temperature of a third roller is 210 ℃, the temperature of a fourth roller is 210 ℃, the temperature of a fifth roller is 200 ℃, the temperature of a sixth roller is 185-190 ℃, and the rolling speed is 1.5-2.0 m/min.

Description

Solvent-resistant non-migration PVC adhesive and preparation method thereof Technical Field The invention relates to the field of PVC materials, in particular to solvent-resistant non-migration PVC adhesive and a preparation method thereof. Background PVC glue is widely applied to scenes such as table top laying, equipment packaging and the like in a plurality of fields such as medical treatment, laboratories, chemical industry and the like by virtue of good bonding strength, processing plasticity and cost advantages. However, in these application scenarios, PVC glue is often exposed to various solvents, including various organic solvents such as isopropyl alcohol, acetone, ethyl acetate, butanone, and methanol, in addition to alcohol commonly used for hospital disinfection. In the prior art, the common PVC glue generally adopts traditional plasticizers such as phthalate, and the compatibility of the plasticizer and PVC resin is poor, so that the plasticizer is easy to migrate and separate out from a PVC system in the long-term use process. In addition, microscopic pores formed by migration can become channels for permeation of solvent molecules, so that corrosion of the solvent to the PVC adhesive is accelerated, swelling, dissolution, delamination and even falling of the adhesive layer are caused, and the service stability and the service life are affected. For example, acetone, which is frequently contacted by laboratory tables, can interact with the defects of the PVC glue after migration, rapidly destroying the integrity of the glue layer. In addition, under the complex scene that multiple solvents are alternately contacted, the solvent resistance of the traditional PVC adhesive is further deteriorated, and the plasticizer migration can also bring about environmental safety hazards. Therefore, there is a need to develop a PVC glue that suppresses plasticizer migration while having excellent resistance to various organic solvents by optimizing the plasticizer system and the supporting components. Disclosure of Invention In view of the shortcomings of the prior art, the invention aims to provide a solvent-resistant non-migration type PVC adhesive and a preparation method thereof, and aims to solve the problems that a plasticizer is easy to migrate and the solvent tolerance performance is poor in the existing PVC adhesive. In order to achieve the above purpose, the invention adopts the following technical scheme: the solvent-resistant non-migration PVC adhesive comprises, by weight, 100 parts of PVC resin, 50-60 parts of adipate polyester plasticizer, 3-5 parts of calcium-zinc stabilizer and 2-4 parts of functional auxiliary agent, wherein the viscosity of the adipate polyester plasticizer at 25 ℃ is 2300-3500 cps, and the acid value is less than or equal to 1 KOH mg/g. The solvent-resistant non-migration PVC adhesive is characterized in that the viscosity of the adipate polyester plasticizer at 25 ℃ is 2800cps, and the acid value is less than or equal to 0.5 KOH mg/g. The solvent-resistant non-migration PVC adhesive comprises a calcium salt and zinc salt, wherein the mass ratio of the calcium salt to the zinc salt in the calcium-zinc stabilizer is (2-3) to 1. The solvent-resistant non-migration PVC adhesive is characterized in that the functional auxiliary agent is butyl stearate and phenolic antioxidants, and the mass ratio of the butyl stearate to the phenolic antioxidants is (2-3) to 1. The solvent-resistant non-migration PVC adhesive is characterized in that the polymerization degree of the PVC resin is 1800-2200, and the K value is 75-82. The solvent-resistant non-migration PVC adhesive comprises, by mass, 100 parts of vinyl chloride monomer, 150-180 parts of desalted water, 0.1-0.2 part of particle modifier, 0.8-1.2 parts of composite emulsifier, 0.05-0.08 part of oil-soluble initiator, 0.03-0.05 part of chain transfer agent and 0.1-0.2 part of pH regulator. The solvent-resistant non-migration PVC adhesive is characterized in that the composite emulsifier is a compound product of sorbitan monostearate and polyoxyethylene sorbitan monolaurate with the mass ratio of (2-3) to 1. The solvent-resistant non-migration PVC adhesive is characterized in that the particle modifier is calcium stearate, the oil-soluble initiator is bis (2-ethylhexyl) peroxydicarbonate, the chain transfer agent is dodecyl mercaptan, and the pH regulator is sodium bicarbonate aqueous solution. A preparation method of the solvent-resistant non-migration PVC adhesive comprises the following steps of fully stirring raw materials, plasticizing the raw materials for the first time, filtering the materials after plasticizing for the second time, and calendaring and cooling the materials after plasticizing for the second time to obtain the solvent-resistant non-migration PVC adhesive. The preparation method of the solvent-resistant non-migration PVC adhesive comprises the steps of stirring raw materials at the temperature of 100-110 ℃ a