Method for making a biodegradable hot melt adhesive

Abstract

A method for producing a biodegradable hot melt adhesive includes: mixing multiple biodegradable materials and subjecting them to a chemical crosslinking reaction to form a copolymer; hydrolyzing the copolymer to form a hydrolyzed copolymer; and mixing the hydrolyzed copolymer, a first additive, and a second additive, and heating the mixture to form a biodegradable hot melt adhesive. The multiple biodegradable materials include at least two of polylactic acid, polycaprolactone, polybutylene succinate, polyhydroxyalkanoates, and polyethylene glycol. The first additive includes at least one of a tackifying resin and a plasticizer, and the second additive includes at least one of an antioxidant and an anti-hydrolysis agent. The above-described method for producing a biodegradable hot melt adhesive has the advantages of a simple production process and low cost, and the resulting biodegradable hot melt adhesive exhibits excellent properties.

Claims

1. A method for preparing a biodegradable hot melt adhesive, comprising: A crosslinking agent is mixed with various biodegradable materials and subjected to a chemical crosslinking reaction to form a copolymer. The copolymer is subjected to a hydrolysis reaction to form a hydrolyzed copolymer; and the hydrolyzed copolymer, a first additive, and a second additive are mixed and heated to form a biodegradable hot melt adhesive; wherein the biodegradable materials include at least two of polylactic acid, polycaprolactone, polybutylene succinate, polyhydroxyalkanoates, and polyethylene glycol; the first additive includes at least one of a tackifying resin and a plasticizer; and the second additive includes at least one of an antioxidant and an anti-hydrolysis agent; wherein the molecular weight of the hydrolyzed copolymer is between 50 kDa and 300 kDa.

2. A method for producing a biodegradable hot melt adhesive as described in claim 1, wherein the step of performing a chemical crosslinking reaction includes: After mixing the crosslinking agent with the biodegradable materials, a chemical crosslinking reaction was carried out for 1 to 2 hours at a temperature between 160 and 190 degrees Celsius and a pressure between 1 MPa and 1.5 MPa.

3. The method for preparing the biodegradable hot melt adhesive as claimed in claim 1, wherein the crosslinking agent includes at least one of bis-tert-butylperoxyisopropylbenzene, dicumyl peroxide, stannous isooctanoate, methylene diphenyl diisocyanate, epoxidized soybean oil, maleicized soybean oil, and epoxidized soybean oil acrylate, and the crosslinking agent accounts for 0.05 wt% to 3.0 wt% of the total weight of the biodegradable materials and the crosslinking agent.

4. A method for producing a biodegradable hot melt adhesive as described in claim 1, wherein the molecular weight of the copolymer is between 500 kDa and 1,500 kDa.

5. A method for producing the biodegradable hot melt adhesive as described in claim 1, wherein the step of hydrolyzing the copolymer includes: A hydrolysis agent is mixed with the copolymer and subjected to a hydrolysis reaction for 1 to 1.5 hours at a temperature between 130 and 160 degrees Celsius and a pressure between 1 MPa and 1.5 MPa.

6. The method for producing a biodegradable hot melt adhesive as claimed in claim 5, wherein the hydrolysis agent includes at least one of sodium hydroxide and potassium hydroxide, and the hydrolysis agent accounts for 0.05 wt% to 3.0 wt% of the total weight of the copolymer and the hydrolysis agent.

7. A method for producing a biodegradable hot melt adhesive as described in claim 1, wherein the molecular weight of the hydrolyzed copolymer is between 100 kDa and 150 kDa.

8. A method for producing a biodegradable hot melt adhesive as claimed in claim 1, wherein the step of mixing and heating the hydrolyzed copolymer, the first additive, and the second additive comprises: The hydrolyzed copolymer, the first additive, and the second additive were mixed and stirred for 1 to 2 hours at a temperature between 130 and 160 degrees Celsius and a pressure between 1 MPa and 1.5 MPa.

9. A method for preparing the biodegradable hot melt adhesive as described in claim 1, wherein: The first additive accounts for 5 wt% to 50 wt% of the total weight of the hydrolyzed copolymer, the first additive, and the second additive; the second additive accounts for 0.05 wt% to 3.0 wt% of the total weight of the hydrolyzed copolymer, the first additive, and the second additive.

10. A method for preparing the biodegradable hot melt adhesive as described in claim 1, wherein: The tackifying resin includes at least one of rosin resins and terpene resins; the plasticizer includes at least one of triethyl citrate, acetylated triethyl citrate, acetylated tributyl citrate, glyceryl tartrate, castor oil, and polyethylene glycol; the hydrolysis inhibitor includes at least one of epoxy compounds and carbodiimide hydrolysis inhibitors; and the antioxidant includes at least one of hindered phenolic antioxidants and phosphite antioxidants.

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