Water-based coating heat-sealing adhesive for medical dialyzing paper and coating process of water-based coating heat-sealing adhesive

Abstract

The invention relates to the technical field of heat-sealing adhesives, and particularly discloses a water-based coating heat-sealing adhesive for medical dialyzing paper and a coating process of the water-based coating heat-sealing adhesive. Comprising an ethylene-vinyl acetate-vinyl alcohol terpolymer, a styrene-butadiene-styrene block copolymer, an ethylene-acrylic acid copolymer emulsion, an ethylene-ethyl acrylate copolymer, a surfactant, a polyvinyl acetate resin emulsion, a wax emulsion, a bactericide, a defoaming agent, a plasticizer, an antioxidant and the balance of deionized water. According to the invention, the ethylene-vinyl acetate-vinyl alcohol terpolymer, the styrene-butadiene-styrene block copolymer, the ethylene-acrylic acid copolymer emulsion and the ethylene-ethyl acrylate copolymer are utilized to improve the cohesiveness and thermal stability of the water-based coating heat-sealing adhesive and the cohesiveness and low-temperature heat sealability of a polar substrate; and the bactericide and the antioxidant are adopted, so that the special requirement of the medical dialyzing paper on sterility is met.

Description

Technical Field

[0001] The invention relates to the technical field of heat-sealing adhesives, in particular to a water-based coating heat-sealing adhesive for medical dialysis paper and a coating process thereof. Background Art

[0002] Medical dialysis paper heat seal adhesive is mainly used in the production process of medical sterilization packaging bags to ensure the sealing of packaging bags. This adhesive has excellent heat sealing properties and can firmly bond dialysis paper and PE film (or PE coated paper) together, thereby ensuring the sterility of medical devices;

[0003] In terms of the types of heat-sealing adhesives for medical dialysis paper, they are mainly divided into solid hot melt adhesives and water-based heat-sealing adhesives. Although solid hot melt adhesives have excellent heat-sealing properties, they have disadvantages such as large glue application amount, high cost, poor air permeability and slow coating speed. Water-based heat-sealing adhesives use anilox roller coating technology, which has fast coating speed, low glue coating dry weight, good air permeability and low production cost. However, water-based heat-sealing adhesives still have problems with stability and reliability in terms of heat-sealing strength; and existing water-based heat-sealing adhesives have poor adhesion to many polar or non-polar substrates, poor thermal stability, weak mechanical strength, poor low-temperature heat sealing and low-temperature hot viscosity. Therefore, a water-based coating heat-sealing adhesive for medical dialysis paper and a coating process thereof are provided. Summary of the invention

[0004] The purpose of the present invention is to provide a water-based coating heat-sealing adhesive for medical dialysis paper and a coating process thereof in view of the defects of the prior art, so as to solve the problems raised by the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a water-based coating heat-sealing adhesive for medical dialysis paper, wherein the water-based coating heat-sealing adhesive comprises, by mass percentage, 6-12% of ethylene-vinyl acetate-vinyl alcohol terpolymer, 5-10% of styrene-butadiene-styrene blocked copolymer, 7-15% of ethylene-acrylic acid copolymer emulsion, 6-10% of ethylene-ethyl acrylate copolymer, 1-4% of surfactant, 2-4% of polyvinyl acetate resin emulsion, 3-5% of wax emulsion, 1-2% of bactericide, 1-2% of defoamer, 1-2% of plasticizer, 1-2% of antioxidant, and the balance is deionized water.

[0006] As a preferred technical solution of the present invention, the surfactant is sodium lauryl sulfate or alkylphenol polyoxyethylene ether.

[0007] As a preferred technical solution of the present invention, the fungicide is isothiazolinone.

[0008] As a preferred technical solution of the present invention, the defoaming agent is BD-303 silicone defoaming agent.

[0009] As a preferred technical solution of the present invention, the plasticizer is polyethylene glycol.

[0010] As a preferred technical solution of the present invention, the antioxidant is antioxidant 1076.

[0011] A method for preparing a water-based coating heat-sealing adhesive for medical dialysis paper, the specific steps are as follows:

[0012] Step 1: firstly put ethylene-vinyl acetate-vinyl alcohol terpolymer, styrene-butadiene-styrene block copolymer, ethylene-acrylic acid copolymer emulsion, ethylene-ethyl acrylate copolymer and deionized water into a reaction kettle, heat to 100-110° C. and stir for 40-45 minutes;

[0013] Step 2: Add wax emulsion, polyvinyl acetate resin emulsion, surfactant, plasticizer and defoamer into the reactor, stir for 10-15 minutes, and then cool to 75-80°C;

[0014] Step 3: Add antioxidant and bactericide into the reaction kettle, stir for 20-25 minutes, and then cool to 45-50° C. to obtain water-based coating heat sealant.

[0015] A coating process for medical dialysis paper using water-based coating heat-sealing adhesive, wherein the water-based coating heat-sealing adhesive is coated on the medical dialysis paper evenly through a 180-wire mesh roller, and then the coated medical dialysis paper is obtained through unwinding, first gluing, first drying, first cooling, second gluing, second drying, second cooling and winding steps in sequence; wherein the first gluing amount is 1-2 g / m2 of the water-based coating heat-sealing adhesive on a dry basis. 2 The first drying temperature is 50-55°C, the first coating speed is 15-30m / min; the first cooling temperature is 30-40°C; the second gluing amount is 0.8-1g / m 2 The second drying temperature is 40-45°C, the second coating speed is 40-45m / min; the second cooling temperature is 30-35°C.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1: The present invention utilizes ethylene-vinyl acetate-vinyl alcohol terpolymer, styrene-butadiene-styrene block copolymer, ethylene-acrylic acid copolymer emulsion, and ethylene-ethyl acrylate copolymer to improve the adhesion, thermal stability, adhesion to polar substrates, and low-temperature heat sealing properties of water-based coating heat seal adhesive; wherein the ethylene-vinyl acetate-vinyl alcohol terpolymer contains hydroxyl groups in the molecule, which improves the adhesion to many polar substrates; the block copolymer is used to improve the thermal stability, mechanical strength, flexibility, and adhesion strength of the water-based coating heat seal adhesive; the ethylene-acrylic acid copolymer emulsion is used to improve the low-temperature heat sealing property and low-temperature hot viscosity of the water-based coating heat seal adhesive; the ethylene-ethyl acrylate copolymer is used for high-temperature coating, and in situations where viscosity and strength are required to be high, and has good adhesion to both polar and non-polar substrates;

[0018] 2: The present invention uses bactericides and antioxidants to meet the special requirements of medical dialysis paper for sterility;

[0019] 3: The present invention adopts a two-time coating method in the coating process, so that the water-based coating heat-sealing adhesive is more evenly coated on the dialysis paper, thereby preventing the phenomenon of incomplete coating. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0021] Embodiment 1: The present invention provides a technical solution: a water-based coating heat-sealing adhesive for medical dialysis paper, which comprises, by mass percentage, 6% of ethylene-vinyl acetate-vinyl alcohol terpolymer, 5% of styrene-butadiene-styrene blocked copolymer, 7% of ethylene-acrylic acid copolymer emulsion, 6% of ethylene-ethyl acrylate copolymer, 1% of surfactant, 2% of polyvinyl acetate resin emulsion, 3% of wax emulsion, 1% of bactericide, 1% of defoamer, 1% of plasticizer, 1% of antioxidant, and the balance is deionized water.

[0022] The surfactant is sodium dodecyl sulfate or alkylphenol polyoxyethylene ether; the bactericide is isothiazolinone; the defoamer is BD-303 silicone defoamer; the plasticizer is polyethylene glycol; and the antioxidant is antioxidant 1076.

[0023] A method for preparing a water-based coating heat-sealing adhesive for medical dialysis paper, the specific steps are as follows:

[0024] Step 1: firstly put ethylene-vinyl acetate-vinyl alcohol terpolymer, styrene-butadiene-styrene block copolymer, ethylene-acrylic acid copolymer emulsion, ethylene-ethyl acrylate copolymer and deionized water into a reaction kettle, heat to 100-110° C. and stir for 40-45 minutes;

[0025] Step 2: Add wax emulsion, polyvinyl acetate resin emulsion, surfactant, plasticizer and defoamer into the reactor, stir for 10-15 minutes, and then cool to 75-80°C;

[0026] Step 3: Add antioxidant and bactericide into the reaction kettle, stir for 20-25 minutes, and then cool to 45-50° C. to obtain water-based coating heat sealant.

[0027] A coating process for medical dialysis paper using water-based coating heat-sealing adhesive, wherein the water-based coating heat-sealing adhesive is coated on the medical dialysis paper evenly through a 180-wire mesh roller, and then the coated medical dialysis paper is obtained through unwinding, first gluing, first drying, first cooling, second gluing, second drying, second cooling and winding steps in sequence; wherein the first gluing amount is 1-2 g / m2 of the water-based coating heat-sealing adhesive on a dry basis. 2 The first drying temperature is 50-55°C, the first coating speed is 15-30m / min; the first cooling temperature is 30-40°C; the second gluing amount is 0.8-1g / m 2 The second drying temperature is 40-45°C, the second coating speed is 40-45m / min; the second cooling temperature is 30-35°C.

[0028] Embodiment 2: The present invention provides a technical solution: a water-based coating heat-sealing adhesive for medical dialysis paper, which comprises, by mass percentage, 10% of ethylene-vinyl acetate-vinyl alcohol terpolymer, 8% of styrene-butadiene-styrene blocked copolymer, 10% of ethylene-acrylic acid copolymer emulsion, 8% of ethylene-ethyl acrylate copolymer, 3% of surfactant, 3% of polyvinyl acetate resin emulsion, 4% of wax emulsion, 2% of bactericide, 2% of defoamer, 2% of plasticizer, 2% of antioxidant, and the balance is deionized water.

[0029] The surfactant is sodium dodecyl sulfate or alkylphenol polyoxyethylene ether; the bactericide is isothiazolinone; the defoamer is BD-303 silicone defoamer; the plasticizer is polyethylene glycol; and the antioxidant is antioxidant 1076.

[0030] A method for preparing a water-based coating heat-sealing adhesive for medical dialysis paper, the specific steps are as follows:

[0031] Step 1: firstly put ethylene-vinyl acetate-vinyl alcohol terpolymer, styrene-butadiene-styrene block copolymer, ethylene-acrylic acid copolymer emulsion, ethylene-ethyl acrylate copolymer and deionized water into a reaction kettle, heat to 100-110° C. and stir for 40-45 minutes;

[0032] Step 2: Add wax emulsion, polyvinyl acetate resin emulsion, surfactant, plasticizer and defoamer into the reactor, stir for 10-15 minutes, and then cool to 75-80°C;

[0033] Step 3: Add antioxidant and bactericide into the reaction kettle, stir for 20-25 minutes, and then cool to 45-50° C. to obtain water-based coating heat sealant.

[0034] A coating process for medical dialysis paper using water-based coating heat-sealing adhesive, wherein the water-based coating heat-sealing adhesive is coated on the medical dialysis paper evenly through a 180-wire mesh roller, and then the coated medical dialysis paper is obtained through unwinding, first gluing, first drying, first cooling, second gluing, second drying, second cooling and winding steps in sequence; wherein the first gluing amount is 1-2 g / m2 of the water-based coating heat-sealing adhesive on a dry basis. 2 The first drying temperature is 50-55°C, the first coating speed is 15-30m / min; the first cooling temperature is 30-40°C; the second gluing amount is 0.8-1g / m 2 The second drying temperature is 40-45°C, the second coating speed is 40-45m / min; the second cooling temperature is 30-35°C.

[0035] Embodiment 3: The present invention provides a technical solution: a water-based coating heat-sealing adhesive for medical dialysis paper, which comprises, by mass percentage, 12% of ethylene-vinyl acetate-vinyl alcohol terpolymer, 10% of styrene-butadiene-styrene blocked copolymer, 15% of ethylene-acrylic acid copolymer emulsion, 10% of ethylene-ethyl acrylate copolymer, 4% of surfactant, 4% of polyvinyl acetate resin emulsion, 5% of wax emulsion, 2% of bactericide, 2% of defoamer, 2% of plasticizer, 2% of antioxidant, and the balance is deionized water.

[0036] The surfactant is sodium dodecyl sulfate or alkylphenol polyoxyethylene ether; the bactericide is isothiazolinone; the defoamer is BD-303 silicone defoamer; the plasticizer is polyethylene glycol; and the antioxidant is antioxidant 1076.

[0037] A method for preparing a water-based coating heat-sealing adhesive for medical dialysis paper, the specific steps are as follows:

[0038] Step 1: firstly put ethylene-vinyl acetate-vinyl alcohol terpolymer, styrene-butadiene-styrene block copolymer, ethylene-acrylic acid copolymer emulsion, ethylene-ethyl acrylate copolymer and deionized water into a reaction kettle, heat to 100-110° C. and stir for 40-45 minutes;

[0039] Step 2: Add wax emulsion, polyvinyl acetate resin emulsion, surfactant, plasticizer and defoamer into the reactor, stir for 10-15 minutes, and then cool to 75-80°C;

[0040] Step 3: Add antioxidant and bactericide into the reaction kettle, stir for 20-25 minutes, and then cool to 45-50° C. to obtain water-based coating heat sealant.

[0041] A coating process for medical dialysis paper using water-based coating heat-sealing adhesive, wherein the water-based coating heat-sealing adhesive is coated on the medical dialysis paper evenly through a 180-wire mesh roller, and then the coated medical dialysis paper is obtained through unwinding, first gluing, first drying, first cooling, second gluing, second drying, second cooling and winding steps in sequence; wherein the first gluing amount is 1-2 g / m2 of the water-based coating heat-sealing adhesive on a dry basis. 2 The first drying temperature is 50-55°C, the first coating speed is 15-30m / min; the first cooling temperature is 30-40°C; the second gluing amount is 0.8-1g / m 2 The second drying temperature is 40-45°C, the second coating speed is 40-45m / min; the second cooling temperature is 30-35°C.

[0042] The coated medical dialysis papers obtained in Examples 1-3 and the coated medical dialysis papers purchased on the market were tested; the specific results are shown in the following table:

[0043]

[0044] In summary, it can be seen that the aqueous coating heat sealant for medical dialysis paper of the present invention has good adhesion to many polar or non-polar substrates, strong thermal stability, high mechanical strength, low-temperature heat sealing and low-temperature hot adhesion.

[0045] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A water-based coating heat-sealing adhesive for medical dialysis paper, characterized in that: The water-based coating heat-sealing adhesive includes, by mass percentage, 6-12% of ethylene-vinyl acetate-vinyl alcohol terpolymer, 5-10% of styrene-butadiene-styrene blocked copolymer, 7-15% of ethylene-acrylic acid copolymer emulsion, 6-10% of ethylene-ethyl acrylate copolymer, 1-4% of surfactant, 2-4% of polyvinyl acetate resin emulsion, 3-5% of wax emulsion, 1-2% of bactericide, 1-2% of defoamer, 1-2% of plasticizer, 1-2% of antioxidant, and the balance is deionized water.

2. The aqueous coating heat sealant for medical dialysis paper according to claim 1, characterized in that: The surfactant is sodium lauryl sulfate or alkylphenol polyoxyethylene ether.

3. The aqueous coating heat sealant for medical dialysis paper according to claim 1, characterized in that: The bactericide is isothiazolinone.

4. The aqueous coating heat sealant for medical dialysis paper according to claim 1, characterized in that: The defoamer is BD-303 organosilicon defoamer.

5. The aqueous coating heat sealant for medical dialysis paper according to claim 1, characterized in that: The plasticizer is polyethylene glycol.

6. The aqueous coating heat sealant for medical dialysis paper according to claim 1, characterized in that: The antioxidant is antioxidant 1076.

7. A method for preparing the aqueous coating heat sealant for medical dialysis paper according to any one of claims 1 to 6, characterized in that: The specific steps are as follows: Step 1: firstly put ethylene-vinyl acetate-vinyl alcohol terpolymer, styrene-butadiene-styrene block copolymer, ethylene-acrylic acid copolymer emulsion, ethylene-ethyl acrylate copolymer and deionized water into a reaction kettle, heat to 100-110° C. and stir for 40-45 minutes; Step 2: Add wax emulsion, polyvinyl acetate resin emulsion, surfactant, plasticizer and defoamer into the reactor, stir for 10-15 minutes, and then cool to 75-80°C; Step 3: Add antioxidant and bactericide into the reaction kettle, stir for 20-25 minutes, and then cool to 45-50° C. to obtain water-based coating heat sealant.

8. A coating process of the aqueous coating heat sealant for medical dialysis paper according to any one of claims 1 to 6, characterized in that: The water-based coating heat-sealing adhesive is evenly coated on the medical dialysis paper after being coated with a 180-wire mesh roller, and the coated medical dialysis paper is obtained by sequentially performing the steps of unwinding, first gluing, first drying, first cooling, second gluing, second drying, second cooling and winding; wherein the first gluing amount is 1-2 g / m2 of the water-based coating heat-sealing adhesive on a dry basis. 2 The first drying temperature is 50-55°C, the first coating speed is 15-30m / min; the first cooling temperature is 30-40°C; the second gluing amount is 0.8-1g / m 2 The second drying temperature is 40-45°C, the second coating speed is 40-45m / min; the second cooling temperature is 30-35°C.

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