Method for preparing hot melt adhesive by blending antistatic agent and modified rosin resin hot melt adhesive

Abstract

The invention provides a method for preparing a hot melt adhesive by blending an antistatic agent and a modified rosin resin hot melt adhesive, and relates to the technical field of hot melt adhesives, the method comprises the following steps: selecting the modified rosin resin hot melt adhesive as a matrix, and adopting an alkyl sulfonate anionic polymer antistatic agent; putting the modified rosin resin hot melt adhesive into a hot melt adhesive machine, heating to a molten state in a protective gas atmosphere, starting a stirring device, and slowly adding the antistatic agent at a certain speed for blending; carrying out filtering and degassing treatment on the blended glue solution; the alkyl sulfonate polymer antistatic agent and the modified rosin resin hot melt adhesive are blended, in the melt blending process, the antistatic agent can be evenly dispersed in the hot melt adhesive, the alkyl sulfonate polymer antistatic agent can construct a conductive network on a non-woven fabric base body due to the permeation effect of the PE / PP film-covered non-woven fabric processed through the compound adhesive, and the antistatic property of the PE / PP film-covered non-woven fabric is improved. The antistatic property of the film-coated non-woven fabric is remarkably improved, and meanwhile, the peel strength is also improved.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesives, in particular to a method for preparing hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive. Background Art

[0002] In the medical and health field, polyethylene / polypropylene (PE / PP) coated nonwovens have broad application prospects. They can effectively block blood penetration and bacterial entry, have high biosafety, and can prevent cross infection and human discomfort.

[0003] However, the inherently poor antistatic properties of PE and PP nonwovens have limited their further application. Currently, methods for improving the antistatic properties of coated nonwovens primarily include antistatic finishing, internal addition of antistatic agents, and composite processing techniques. Antistatic finishing methods suffer from a short-lasting antistatic effect; improper internal addition of antistatic agents can adversely affect other material properties, such as thermal stability and mechanical properties; and composite processing techniques are relatively complex and costly. Therefore, the present invention proposes a method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive to address these issues. Summary of the Invention

[0004] In response to the above problems, the present invention proposes a method for preparing hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive. The method for preparing hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive can effectively improve the antistatic performance of the hot melt adhesive, thereby improving the antistatic performance of the PE / PP coated non-woven fabric. The process is relatively simple and has little effect on other properties of the material.

[0005] To achieve the purpose of the present invention, the present invention is implemented by the following technical solution: a method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive, comprising the following steps:

[0006] S1: Modified rosin resin hot melt adhesive is used as the matrix and alkyl sulfonate anionic polymer antistatic agent is used;

[0007] S2: Add the modified rosin resin hot melt adhesive into the hot melt adhesive machine, heat it to a molten state under a protective gas atmosphere, start the stirring device, and slowly add the antistatic agent at a certain rate for blending;

[0008] S3: Filtering and degassing the blended adhesive solution to obtain a compounded hot melt adhesive.

[0009] A further improvement is that: in S1, the softening point of the modified rosin resin hot melt adhesive is 90-110°C and the composition is a compound of hydrogenated rosin glycerol ester and C5 petroleum resin, with the mass ratio of the two being 3:2.

[0010] A further improvement is that: in the above S1, the sulfonic acid group content in the molecular structure of the alkyl sulfonate anionic polymer antistatic agent is ≥15%, and the number average molecular weight is 5000-8000 Da.

[0011] A further improvement is that in S1, the amount of antistatic agent added is 5%-15% of the total mass of the hot melt adhesive; when the amount of antistatic agent added is 10%, the melt viscosity of the hot melt adhesive at 175°C is stabilized at 350±5mPa·s.

[0012] A further improvement is that in said S2, during melt blending, the heating temperature is raised to 140-150°C and the heat preservation time is 30 minutes, until the modified rosin resin hot melt adhesive is completely melted.

[0013] A further improvement is that in the above S2, during the melt blending process, the blending temperature fluctuation is maintained at ±2°C, and stirring is continued for 40-60 minutes until the system conductivity stabilizes at 5×10 -8 S / cm or more.

[0014] A further improvement is that in S2, the stirring speed of the stirring device is 200-280 r / min, and the addition rate of the antistatic agent is 0.5 g / min.

[0015] A further improvement is that in S2, the blending process is carried out under nitrogen protection, with a nitrogen flow rate of 0.5-2.0 L / min, to ensure that the oxygen content of the blending system is ≤0.1%.

[0016] A further improvement is that in S3, a 100-mesh stainless steel filter is used for filtration to remove undispersed particles.

[0017] A further improvement is that in S3, degassing is carried out under a vacuum degree of ≤-0.09 MPa and the degassing time is 15 minutes to eliminate bubbles introduced by stirring.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention blends an alkyl sulfonate polymer antistatic agent with a modified rosin resin hot melt adhesive. During the melt blending process, the antistatic agent can be evenly dispersed in the hot melt adhesive. The PE / PP coated non-woven fabric processed by the compound adhesive can construct a conductive network on the non-woven fabric substrate due to the penetration effect of the alkyl sulfonate polymer antistatic agent, which significantly improves the antistatic performance of the coated non-woven fabric and also improves the peel strength.

[0020] 2. The present invention controls parameters such as temperature, stirring speed, and amount of antistatic agent added during the blending process so that the melt viscosity of the compounded adhesive tends to be stable when the mass fraction of the antistatic agent is 10%, and the thermal stability meets the use requirements. Thermal decomposition will not occur before 202°C. The filtration and degassing treatments in the functional post-treatment steps remove undispersed particles and bubbles, thereby improving the quality of the hot melt adhesive. The hot melt adhesive prepared by this method is used for spray coating of PE / PP non-woven fabrics, and the resulting coated non-woven fabric has good water washing fastness. After 5 water washings, the front and back sides still have a low induced voltage. In addition, the method is relatively simple. By reasonably selecting raw materials and process parameters, it can effectively improve the antistatic properties of the hot melt adhesive, thereby improving the performance of the PE / PP coated non-woven fabric, and has good creativity and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Flowchart of the present invention. DETAILED DESCRIPTION

[0022] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0023] Example 1

[0024] according to Figure 1 As shown, this embodiment proposes a method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive, comprising the following steps:

[0025] S1: A modified rosin resin hot melt adhesive is used as the matrix, and an alkyl sulfonate anionic polymer antistatic agent is used. The sulfonic acid group content in the molecular structure of the alkyl sulfonate anionic polymer antistatic agent is ≥15%, and the number average molecular weight is 5000-8000Da. The antistatic agent is added in an amount of 5%-15% of the total mass of the hot melt adhesive. When the antistatic agent is added in an amount of 10%, the melt viscosity of the hot melt adhesive at 175°C is stabilized at 350±5mPa·s. The softening point of the modified rosin resin hot melt adhesive is 90-110°C. The composition is a compound of hydrogenated rosin glycerol ester and C5 petroleum resin, with a mass ratio of 3:2.

[0026] S2: Add the modified rosin resin hot melt adhesive into the hot melt adhesive machine, heat it to a molten state under a protective gas atmosphere, start the stirring device, and slowly add the antistatic agent at a certain rate to blend; during melt blending, the temperature is raised to 140-150℃ and the heat preservation time is 30 minutes until the modified rosin resin hot melt adhesive is completely melted; during the melt blending process, the blending temperature fluctuation is maintained at ±2℃, and stirring is continued for 40-60 minutes until the system conductivity is stabilized at 5×10 -8S / cm or above; the stirring speed of the stirring device is 200-280r / min, and the addition rate of the antistatic agent is 0.5g / min; the blending process is carried out under nitrogen protection, with a nitrogen flow rate of 0.5-2.0L / min to ensure that the oxygen content of the blending system is ≤0.1%;

[0027] S3: Filter and degas the blended adhesive to obtain a compounded hot melt adhesive. Use a 100-mesh stainless steel filter to remove undispersed particles. Degassing is performed at a vacuum of ≤-0.09 MPa for 15 minutes to eliminate bubbles introduced by stirring.

[0028] The present invention blends an alkyl sulfonate polymer antistatic agent with a modified rosin resin hot melt adhesive. During the melt blending process, the antistatic agent can be evenly dispersed in the hot melt adhesive. The PE / PP coated non-woven fabric processed with the compound adhesive can, due to the penetration effect, construct a conductive network on the non-woven fabric substrate by the alkyl sulfonate polymer antistatic agent, significantly improving the antistatic performance of the coated non-woven fabric, while also improving the peel strength.

[0029] Example 2

[0030] according to Figure 1 As shown, this embodiment proposes a method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive, comprising the following steps:

[0031] Raw material pretreatment: A modified rosin resin hot melt adhesive with a softening point of 100°C was selected, the main components of which were a compound of hydrogenated rosin glycerol ester and C5 petroleum resin in a mass ratio of 3:2; an alkyl sulfonate anionic polymer antistatic agent with a sulfonic acid group content of 16% and a number average molecular weight of 6000Da was selected as the antistatic agent.

[0032] Melt blending: Place the modified rosin resin hot melt adhesive into the LG13H hot melt adhesive machine and heat it to 145°C under nitrogen protection. Keep warm for 30 minutes until it is completely melted. Start the electric stirring device at a stirring speed of 240r / min. Slowly add the antistatic agent at a rate of 0.5g / min. The antistatic agent accounts for 10% of the mass fraction of the hot melt adhesive. Maintain the blending temperature at 145±2°C and continue stirring for 50 minutes until the system conductivity stabilizes at 5×10 -8 S / cm or more.

[0033] Functional post-treatment: After the blending is completed, the adhesive solution is filtered through a 100-mesh stainless steel filter to remove undispersed particles, and then degassed for 15 minutes under a vacuum degree of -0.095 MPa to eliminate bubbles introduced by stirring to obtain a compound hot melt adhesive.

[0034] Example 3

[0035] according to Figure 1As shown, this embodiment proposes a method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive, comprising the following steps:

[0036] Raw material pretreatment: The softening point of the modified rosin resin hot melt adhesive is 95° C., and the ingredients and proportions are the same as those in Example 2; the antistatic agent has a sulfonic acid group content of 15% and a number average molecular weight of 5000 Da.

[0037] Melt blending: heating to 140° C., keeping warm for 30 minutes, stirring at 200 r / min, adding antistatic agent at a rate of 0.5 g / min, with a mass fraction of 5%, stirring for 60 minutes. Other conditions are the same as those in Example 2.

[0038] Functionalization post-processing: same as in Example 2.

[0039] Example 4

[0040] according to Figure 1 As shown, this embodiment proposes a method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive, comprising the following steps:

[0041] Raw material pretreatment: The softening point of the modified rosin resin hot melt adhesive is 110° C., and the ingredients and proportions are the same as those in Example 2; the antistatic agent has a sulfonic acid group content of 18% and a number average molecular weight of 8000 Da.

[0042] Melt blending: heating to 150°C, keeping warm for 30 minutes, stirring at 280 r / min, adding antistatic agent at a rate of 0.5 g / min, with a mass fraction of 15%, stirring for 40 minutes, and other conditions are the same as those in Example 2;

[0043] Functionalization post-processing: same as in Example 2.

[0044] Performance testing:

[0045] Melt viscosity test: Using an LDX hot melt adhesive high temperature viscometer, the melt viscosity of the compound adhesive prepared in Example 2 was tested at 175°C to be 355 mPa·s. When the mass fraction of the antistatic agent was 10%, the melt viscosity of the compound adhesive tended to be stable.

[0046] Thermal stability test: A DSC-60A automatic differential thermal and thermogravimetric simultaneous measurement device was used, and heating was performed in a N2 atmosphere in a temperature range of 30-700°C and a heating rate of 15°C / min. The results showed that the compounded adhesive of Example 2 did not undergo thermal decomposition before 202°C, and the thermal stability was within a reasonable range.

[0047] Washing resistance and antistatic performance test: The PE / PP coated non-woven fabric processed with the compound glue in Example 2 was shaken and washed in a 5% soap solution by mass for 5 minutes, rinsed with distilled water until no detergent residue was left, dried at 60°C, and balanced at a temperature of (25±2)°C and a relative humidity of (40±2)% for 24 hours. After 5 washes, the induced voltage on the front and back sides was low, indicating good washing resistance.

[0048] Comparative Example 1

[0049] Coated nonwoven fabric processed with modified rosin resin hot melt adhesive without adding antistatic agent:

[0050] The initial induced voltage was 850±50V, and the half-life after 5 washes was 5.8s;

[0051] Peel strength 8.2N / cm.

[0052] Table 1: Melt viscosity comparison

[0053]

[0054] Table 2: Comparison of washable and antistatic properties

[0055]

[0056] The method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive comprises blending an alkyl sulfonate polymer antistatic agent with the modified rosin resin hot melt adhesive. During the melt blending process, the antistatic agent can be uniformly dispersed in the hot melt adhesive. In a PE / PP coated nonwoven fabric processed with the compound adhesive, the alkyl sulfonate polymer antistatic agent can construct a conductive network on the nonwoven fabric substrate due to the penetration effect, thereby significantly improving the antistatic performance of the coated nonwoven fabric and simultaneously improving the peel strength. At the same time, the present invention controls parameters such as temperature, stirring speed, and amount of antistatic agent added during the blending process, so that the melt viscosity of the compounded adhesive tends to be stable when the mass fraction of the antistatic agent is 10%, and the thermal stability meets the use requirements, and thermal decomposition does not occur before 202°C. The filtration and degassing treatment in the functional post-treatment step removes undispersed particles and bubbles, and improves the quality of the hot melt adhesive. The hot melt adhesive prepared by this method is used for spray coating of PE / PP non-woven fabrics, and the resulting coated non-woven fabric has good water washing fastness. After 5 water washings, the front and back sides still have a low induced voltage. In addition, the method is relatively simple. By reasonably selecting raw materials and process parameters, it can effectively improve the antistatic properties of the hot melt adhesive, thereby improving the performance of the PE / PP coated non-woven fabric, and has good creativity and practicality.

[0057] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive, characterized in that: The following steps are involved: S1: Modified rosin resin hot melt adhesive is used as the matrix and alkyl sulfonate anionic polymer antistatic agent is used; S2: Add the modified rosin resin hot melt adhesive into the hot melt adhesive machine, heat it to a molten state under a protective gas atmosphere, start the stirring device, and slowly add the antistatic agent at a certain rate for blending; S3: Filtering and degassing the blended adhesive solution to obtain a compounded hot melt adhesive.

2. The method for preparing a hot melt adhesive by blending the antistatic agent according to claim 1 with a modified rosin resin hot melt adhesive, characterized in that: In S1, the softening point of the modified rosin resin hot melt adhesive is 90-110° C. The composition is a compound of hydrogenated rosin glycerol ester and C5 petroleum resin, with the mass ratio of the two being 3:

2.

3. The method for preparing a hot melt adhesive by blending the antistatic agent and modified rosin resin hot melt adhesive according to claim 2, characterized in that: In the S1, the alkyl sulfonate anionic polymer antistatic agent has a sulfonic acid group content of ≥15% in its molecular structure and a number average molecular weight of 5000-8000 Da.

4. The method for preparing a hot melt adhesive by blending the antistatic agent with a modified rosin resin hot melt adhesive according to claim 3, characterized in that: In S1, the amount of the antistatic agent added is 5%-15% of the total mass of the hot melt adhesive; when the amount of the antistatic agent added is 10%, the melt viscosity of the hot melt adhesive at 175° C. is stabilized at 350±5 mPa·s.

5. The method for preparing a hot melt adhesive by blending the antistatic agent with a modified rosin resin hot melt adhesive according to claim 1, characterized in that: In the above-mentioned S2, during melt blending, the temperature is raised to 140-150° C. and the heat preservation time is 30 minutes, until the modified rosin resin hot melt adhesive is completely melted.

6. The method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive according to claim 5, characterized in that: In the S2, during the melt blending process, the blending temperature fluctuation was maintained at ±2°C, and stirring was continued for 40-60 minutes until the system conductivity stabilized at 5×10 -8 S / cm or more.

7. The method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive according to claim 6, characterized in that: In the above-mentioned S2, the stirring speed of the stirring device is 200-280 r / min, and the adding rate of the antistatic agent is 0.5 g / min.

8. The method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive according to claim 7, characterized in that: In S2, the blending process is carried out under nitrogen protection with a nitrogen flow rate of 0.5-2.0 L / min to ensure that the oxygen content of the blending system is ≤0.1%.

9. The method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive according to claim 1, characterized in that: In S3, a 100-mesh stainless steel filter is used for filtration to remove undispersed particles.

10. The method for preparing a hot melt adhesive by blending an antistatic agent with a modified rosin resin hot melt adhesive according to claim 9, characterized in that: In the step S3, degassing is performed under a vacuum degree of ≤-0.09 MPa for 15 min to eliminate bubbles introduced by stirring.

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