PUR hot melt adhesive with good biocompatibility and preparation method thereof

Abstract

The invention relates to the technical field of hot melt adhesives, and particularly discloses a PUR hot melt adhesive with good biocompatibility and a preparation method thereof. The PUR hot melt adhesive with good biocompatibility is prepared from the following raw material components in parts by weight: 80 to 90 parts of polyester type polyurethane, 5 to 15 parts of a tackifier, 1 to 5 parts of a softening agent, 1 to 5 parts of a biocompatibility auxiliary agent, 5 to 10 parts of a slipping agent and 5 to 10 parts of silane modified talcum powder. The silane modified talcum powder has good dispersing performance, the talcum powder in the silane modified talcum powder can improve the viscosity of the PUR hot melt adhesive and also has a certain lubricating effect, and the skin-friendly performance of the prepared PUR hot melt adhesive is improved through cooperation of the softening agent, the biocompatibility auxiliary and the slipping agent.

Description

Technical Field

[0001] The present application relates to the technical field of hot melt adhesives, and in particular to a PUR hot melt adhesive with good biocompatibility and a preparation method thereof. Background Art

[0002] PUR is a moisture-curing reactive polyurethane hot melt adhesive. The main component is an isocyanate-terminated polyurethane prepolymer. The adhesion and toughness of PUR are adjustable, and it has excellent bonding strength, temperature resistance, chemical corrosion resistance and aging resistance. In recent years, it has become one of the important varieties in the adhesive industry. It is now widely used in national economic fields such as packaging, wood processing, automobiles, textiles, electromechanics, aerospace, etc. However, the commonly used PUR hot melt adhesive has a poor skin-friendly feel after curing, which limits its application range. Summary of the invention

[0003] In order to improve the skin-friendly performance of PUR hot melt adhesive, the present application provides a PUR hot melt adhesive with good biocompatibility and a preparation method thereof.

[0004] In the first aspect, the present application provides a PUR hot melt adhesive with good biocompatibility, which adopts the following technical scheme: a PUR hot melt adhesive with good biocompatibility, the raw materials of the PUR hot melt adhesive include the following components in parts by weight: 80-90 parts of polyester polyurethane, 5-15 parts of tackifier, 1-5 parts of softener, 1-5 parts of biocompatibility additive, 5-10 parts of lubricant, and 5-10 parts of silane-modified talc.

[0005] By adopting the above technical scheme, the silane-modified talc has good dispersibility. The talc in the silane-modified talc can not only increase the viscosity of the PUR hot melt adhesive, but also has a certain lubricating effect. When combined with a softener, a biocompatible additive, and a lubricant, the skin-friendly performance of the prepared PUR hot melt adhesive is improved.

[0006] In a specific embodiment, the preparation method of the silane-modified talc comprises the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified solution; The talcum powder is stirred, and during the stirring process, the modifying liquid is sprayed into the talcum powder. After the spraying is completed, the stirring is continued, and finally the talcum powder is dried to obtain the silane-modified talcum powder.

[0007] By adopting the above technical scheme, γ-aminopropyltriethoxysilane is firstly dissolved in ethanol to obtain a modified liquid, and then the modified liquid is sprayed while stirring the talc. After the spraying is completed, stirring is continued, and finally drying is performed to obtain silane-modified talc.

[0008] In a specific embodiment, the weight ratio of the modified liquid to the talc is 1:(13-14).

[0009] By adopting the above technical solution, the ratio of the modified liquid to the talcum powder is further limited, and the modification effect of the talcum powder is improved.

[0010] In a specific embodiment, the tackifier includes rosin resin, terpene resin, or a mixture of both.

[0011] By adopting the above technical solution and adding rosin resin and terpene resin, the adhesion performance of the prepared PUR hot melt adhesive can be improved.

[0012] In a specific embodiment, the softener includes one of silicone oil, vegetable oil and mineral oil.

[0013] By adopting the above technical solution, the addition of silicone oil, vegetable oil and mineral oil can make the cured PUR hot melt adhesive have a better feel, thereby improving the skin-friendly performance of the PUR hot melt adhesive.

[0014] In a specific embodiment, the biocompatibility auxiliary agent includes a mixture of polydimethylsiloxane and glycerol fatty acid ester.

[0015] In a specific embodiment, the slip agent includes a mixture of ethylene dioleamide and vinyl bisstearamide.

[0016] By adopting the above technical scheme, using a composite biocompatible additive composed of polydimethylsiloxane and glycerol fatty acid ester, and a composite lubricant composed of ethylene dioleamide and vinyl bisstearamide, the affinity of PUR hot melt adhesive to the skin can be improved, thereby improving the skin-friendly performance of PUR hot melt adhesive.

[0017] In a specific implementation manner, the raw materials of the PUR hot melt adhesive further include 1 to 3 parts by weight of montan wax.

[0018] By adopting the above technical solution, the addition of montan wax can reduce the adhesion and aggregation between the raw materials, so that the components in the PUR hot melt adhesive are evenly dispersed, thereby further improving the skin-friendly performance of the PUR hot melt adhesive.

[0019] In the second aspect, the present application provides a method for preparing a PUR hot melt adhesive with good biocompatibility, which adopts the following technical solution: A method for preparing a PUR hot melt adhesive with good biocompatibility comprises the following steps: The polyester polyurethane, tackifier, softener, biocompatible additive, lubricant, silane-modified talc and montan wax are stirred and mixed evenly, and then heated and melted to obtain a PUR hot melt adhesive with good biocompatibility.

[0020] By adopting the above technical scheme, polyester polyurethane, tackifier, softener, biocompatible additive, lubricant, silane-modified talc and lignite wax are first stirred and mixed uniformly, and then heated and melted to obtain a PUR hot melt adhesive with good biocompatibility.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The silane-modified talc in the present application has good dispersibility. The talc in the silane-modified talc can not only increase the viscosity of the PUR hot melt adhesive, but also has a certain lubricating effect. By using the combination of softeners, biocompatible additives, and lubricants, the skin-friendly performance of the prepared PUR hot melt adhesive is improved; 2. The composite biocompatible additive composed of polydimethylsiloxane and glycerol fatty acid ester, and the composite lubricant composed of ethylene dioleamide and vinyl bisstearamide used in the present application can improve the affinity of PUR hot melt adhesive with the skin, thereby improving the skin-friendly performance of PUR hot melt adhesive; 3. In the method of the present application, polyester polyurethane, tackifier, softener, biocompatible additive, lubricant, silane-modified talc, and montan wax are first stirred and mixed uniformly, and then heated and melted to obtain a PUR hot melt adhesive with good biocompatibility. DETAILED DESCRIPTION

[0022] The present application is further described in detail below in conjunction with embodiments.

[0023] All raw materials in the examples can be obtained commercially. Among them, the tackifier includes but is not limited to a mixture of one or two of rosin resin and terpene resin, and rosin resin is preferred in this application; the softener includes but is not limited to a mixture of one or more of silicone oil, vegetable oil, and mineral oil, and silicone oil is preferred in this application.

[0024] Preparation Example Preparation Example 1 Preparation Example 1 provides a method for preparing silane-modified talc, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; Add talcum powder into a high-speed mixer, spray the modifying liquid into the talcum powder during stirring, continue stirring for 0.5 h after spraying, and finally dry at 115°C for 2 h to obtain silane-modified talcum powder; wherein the weight ratio of the modifying liquid to the talcum powder is 1:12.5.

[0025] Preparation Example 2 Preparation Example 2 provides a method for preparing silane-modified talc, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; Add talcum powder into a high-speed mixer, spray the modifying liquid into the talcum powder during stirring, continue stirring for 0.5 h after spraying, and finally dry at 115°C for 2 h to obtain silane-modified talcum powder; wherein the weight ratio of the modifying liquid to the talcum powder is 1:13.

[0026] Preparation Example 3 Preparation Example 3 provides a method for preparing silane-modified talc, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; Add talcum powder into a high-speed mixer, spray the modifying liquid into the talcum powder during stirring, continue stirring for 0.5 h after spraying, and finally dry at 115°C for 2 h to obtain silane-modified talcum powder; wherein the weight ratio of the modifying liquid to the talcum powder is 1:13.5.

[0027] Preparation Example 4 Preparation Example 4 provides a method for preparing silane-modified talc, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; Add talcum powder into a high-speed mixer, spray the modifying liquid into the talcum powder during stirring, continue stirring for 0.5 h after spraying, and finally dry at 115°C for 2 h to obtain silane-modified talcum powder; wherein the weight ratio of the modifying liquid to the talcum powder is 1:14.

[0028] Preparation Example 5 Preparation Example 5 provides a method for preparing silane-modified talc, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; Add talcum powder into a high-speed mixer, spray the modifying liquid into the talcum powder during stirring, continue stirring for 0.5 h after spraying, and finally dry at 115°C for 2 h to obtain silane-modified talcum powder; wherein the weight ratio of the modifying liquid to the talcum powder is 1:14.5. Example

[0029] Example 1 Embodiment 1 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 80 kg of polyester polyurethane, 5 kg of tackifier, 1 kg of softener, 1 kg of biocompatibility additive, 5 kg of lubricant, and 5 kg of silane-modified talc in Preparation Example 1 were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatibility additive is a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the weight ratio of polydimethylsiloxane to glycerol fatty acid ester is 1:1; the lubricant is a mixture of ethylene dioleamide and vinyl bisstearamide, and the weight ratio of ethylene dioleamide to vinyl bisstearamide is 1:1.

[0030] Example 2 The difference between Example 2 and Example 1 is that the silane-modified talc powder is the silane-modified talc powder in Preparation Example 2, and the other steps are consistent with Example 1.

[0031] Example 3 The difference between Example 3 and Example 1 is that the silane-modified talc powder is the silane-modified talc powder in Preparation Example 3, and the other steps are consistent with Example 1.

[0032] Example 4 The difference between Example 4 and Example 1 is that the silane-modified talc powder is the silane-modified talc powder in Preparation Example 4, and the other steps are consistent with Example 1.

[0033] Example 5 The difference between Example 5 and Example 1 is that the silane-modified talc powder is the silane-modified talc powder in Preparation Example 5, and the other steps are consistent with Example 1.

[0034] Example 6 Example 6 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 85 kg of polyester polyurethane, 10 kg of tackifier, 3 kg of softener, 3 kg of biocompatible additive, 7.5 kg of lubricant, and 7.5 kg of silane-modified talc in Preparation Example 3 were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatible additive is a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the weight ratio of polydimethylsiloxane to glycerol fatty acid ester is 1:1; the lubricant is a mixture of ethylene dioleamide and vinyl bisstearamide, and the weight ratio of ethylene dioleamide to vinyl bisstearamide is 1:1.

[0035] Example 7 Example 7 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 90 kg of polyester polyurethane, 15 kg of tackifier, 5 kg of softener, 5 kg of biocompatible additive, 10 kg of lubricant, and 10 kg of silane-modified talc in Preparation Example 3 were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatible additive is a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the weight ratio of polydimethylsiloxane to glycerol fatty acid ester is 1:1; the lubricant is a mixture of ethylene dioleamide and vinyl bisstearamide, and the weight ratio of ethylene dioleamide to vinyl bisstearamide is 1:1.

[0036] Example 8 Example 8 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 85 kg of polyester polyurethane, 10 kg of tackifier, 3 kg of softener, 3 kg of biocompatibility additive, 7.5 kg of lubricant, and 7.5 kg of silane-modified talc in Preparation Example 3 were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatibility additive is polydimethylsiloxane; the lubricant is a mixture of ethylene dioleamide and vinyl bisstearamide, and the weight ratio of ethylene dioleamide to vinyl bisstearamide is 1:1.

[0037] Example 9 Example 9 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 85 kg of polyester polyurethane, 10 kg of tackifier, 3 kg of softener, 3 kg of biocompatible additive, 7.5 kg of lubricant, and 7.5 kg of silane-modified talc in Preparation Example 3 were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatible additive is glycerol fatty acid ester; the lubricant is a mixture of ethylene dioleamide and vinyl bisstearamide, and the weight ratio of ethylene dioleamide to vinyl bisstearamide is 1:1.

[0038] Example 10 Embodiment 10 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 85 kg of polyester polyurethane, 10 kg of tackifier, 3 kg of softener, 3 kg of biocompatibility additive, 7.5 kg of lubricant, and 7.5 kg of silane-modified talc in Preparation Example 3 were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatibility additive is a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the weight ratio of polydimethylsiloxane to glycerol fatty acid ester is 1:1; the lubricant is ethylene dioleamide.

[0039] Embodiment 11 Embodiment 11 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 85 kg of polyester polyurethane, 10 kg of tackifier, 3 kg of softener, 3 kg of biocompatibility additive, 7.5 kg of lubricant, and 7.5 kg of silane-modified talc in Preparation Example 3 were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatibility additive is a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the weight ratio of polydimethylsiloxane to glycerol fatty acid ester is 1:1; the lubricant is vinyl bisstearamide.

[0040] Example 12 Example 12 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 85 kg of polyester polyurethane, 10 kg of tackifier, 3 kg of softener, 3 kg of biocompatible additive, 7.5 kg of lubricant, 7.5 kg of silane-modified talc in Preparation Example 3, and 2 kg of montan wax were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatible additive is a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the weight ratio of polydimethylsiloxane to glycerol fatty acid ester is 1:1; the lubricant is a mixture of ethylene dioleamide and vinyl bisstearamide, and the weight ratio of ethylene dioleamide to vinyl bisstearamide is 1:1.

[0041] Comparative Example Comparative Example 1 Comparative Example 1 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 80kg of polyester polyurethane, 5kg of tackifier, 1kg of softener, 1kg of biocompatible additive, 5kg of lubricant and 5kg of talcum powder are stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatible additive is a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the weight ratio of polydimethylsiloxane to glycerol fatty acid ester is 1:1; the lubricant is a mixture of ethylene dioleamide and vinyl bisstearamide, and the weight ratio of ethylene dioleamide to vinyl bisstearamide is 1:1.

[0042] Comparative Example 2 Comparative Example 2 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 80 kg of polyester polyurethane, 5 kg of tackifier, 1 kg of biocompatible additive, 5 kg of lubricant, and 5 kg of silane-modified talc in Preparation Example 1 were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the biocompatible additive is a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the weight ratio of polydimethylsiloxane to glycerol fatty acid ester is 1:1; the lubricant is a mixture of ethylene dioleamide and vinyl bisstearamide, and the weight ratio of ethylene dioleamide to vinyl bisstearamide is 1:1.

[0043] Comparative Example 3 Comparative Example 3 provides a method for preparing a PUR hot melt adhesive with good biocompatibility, comprising the following steps: 80 kg of polyester polyurethane, 5 kg of tackifier, 1 kg of softener, 1 kg of biocompatibility additive, and 5 kg of silane-modified talc in Preparation Example 1 were stirred and mixed evenly, and then heated to melt to obtain a PUR hot melt adhesive with good biocompatibility; wherein the tackifier is rosin resin; the softener is silicone oil; the biocompatibility additive is a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the weight ratio of polydimethylsiloxane to glycerol fatty acid ester is 1:1.

[0044] Performance test skin-friendly performance: Heat the PUR hot melt adhesive at 120°C, then apply it on the fabric with a round screen with a pore size of 0.4μm. After it is cured, place it in a constant temperature and humidity environment at 18°C ​​and 80% humidity for 48 hours. Select ten testers to test the feel of the cured PUR hot melt adhesive, and then score it and take the average value. The scoring level standard is 1-10. The higher the level, the better the skin-friendly performance.

[0045] Table 1 Performance test results of PUR hot melt adhesive Combining Example 1 and Comparative Examples 1-3, the skin-friendly performance of the PUR hot melt adhesive in Example 1 is the best. It can be seen that when preparing the PUR hot melt adhesive, adding silane-modified talc, softener, biocompatible additive, and lubricant, and utilizing the compounding effect of the above, the skin-friendly performance of the prepared PUR hot melt adhesive can be improved.

[0046] Combined with Examples 1-5, the skin-friendly performance of the PUR hot melt adhesive in Examples 2-4 is good. It can be seen that when preparing silane-modified talc, the ratio of the modified liquid to the talc is preferably 1:(13-14), and the effect of obtaining silane-modified talc is better.

[0047] Combining Example 3, Example 6 and Example 7, the skin-friendly performance of the PUR hot melt adhesive in Example 6 is the best. It can be seen that when preparing the PUR hot melt adhesive, increasing the amount of raw materials used, the performance of the obtained PUR hot melt adhesive shows a trend of first increasing and then decreasing.

[0048] Combining Example 6, Example 8 and Example 9, the skin-friendly performance of the PUR hot melt adhesive in Example 6 is the best. It can be seen that when preparing the PUR hot melt adhesive, the biocompatible additive is preferably a mixture of polydimethylsiloxane and glycerol fatty acid ester, and the skin-friendly performance of the obtained PUR hot melt adhesive is better.

[0049] Combining Example 6, Example 10 and Example 11, the skin-friendly performance of the PUR hot melt adhesive in Example 6 is the best. It can be seen that when preparing the PUR hot melt adhesive, the lubricant is preferably a mixture of ethylene dioleamide and vinyl bisstearamide, and the skin-friendly performance of the obtained PUR hot melt adhesive is better.

[0050] Combining Example 6 and Example 12, the skin-friendly performance of the PUR hot melt adhesive in Example 12 is the best. It can be seen that when preparing the PUR hot melt adhesive, adding montan wax to the raw materials can make the components in the PUR hot melt adhesive fully dispersed, thereby further improving the skin-friendly performance of the PUR hot melt adhesive.

[0051] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A PUR hot melt adhesive with good biocompatibility, characterized in that: The raw materials of the PUR hot melt adhesive include the following components in parts by weight: 80-90 parts of polyester polyurethane, 5-15 parts of tackifier, 1-5 parts of softener, 1-5 parts of biocompatible additive, 5-10 parts of lubricant, and 5-10 parts of silane-modified talc.

2. The PUR hot melt adhesive with good biocompatibility according to claim 1, characterized in that: The preparation method of the silane-modified talcum powder comprises the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified solution; The talcum powder is stirred, and during the stirring process, the modifying liquid is sprayed into the talcum powder. After the spraying is completed, the stirring is continued, and finally the talcum powder is dried to obtain the silane-modified talcum powder.

3. The PUR hot melt adhesive with good biocompatibility according to claim 2, characterized in that: The weight ratio of the modified liquid to the talcum powder is 1:(13-14).

4. The PUR hot melt adhesive with good biocompatibility according to claim 1, characterized in that: The tackifier comprises one of rosin resin and terpene resin or a mixture of the two.

5. The PUR hot melt adhesive with good biocompatibility according to claim 1, characterized in that: The softener includes one of silicone oil, vegetable oil and mineral oil.

6. The PUR hot melt adhesive with good biocompatibility according to claim 1, characterized in that: The biocompatible auxiliary agent comprises a mixture of polydimethylsiloxane and glycerol fatty acid ester.

7. The PUR hot melt adhesive with good biocompatibility according to claim 1, characterized in that: The lubricant comprises a mixture of ethylene dioleamide and vinyl bisstearamide.

8. The PUR hot melt adhesive with good biocompatibility according to claim 1, characterized in that: The raw materials of the PUR hot melt adhesive also include 1 to 3 parts by weight of montan wax.

9. A method for preparing a PUR hot melt adhesive with good biocompatibility as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: The polyester polyurethane, tackifier, softener, biocompatible additive, lubricant, silane-modified talc and montan wax are stirred and mixed evenly, and then heated and melted to obtain a PUR hot melt adhesive with good biocompatibility.

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