Hot melt adhesive for high holding and sticking hooks and preparation method thereof

Abstract

The application relates to a hot melt adhesive for high holding and sticking hooks and a preparation method thereof, and relates to the technical field of hot melt adhesives. The hot melt adhesive comprises the following components in percentage by weight: naphthenic oil 10-20%, SIS rubber 35-50%, petroleum resin 0-20%, rosin resin A 10-30%, rosin resin B 0-20%, phenolic antioxidant 0.1-1%, and phosphite antioxidant 0.1-1%. The hot melt adhesive for high holding and sticking hooks provided by the application takes SIS rubber as a base material, can provide excellent cohesion, can have good substrate wettability, can make the holding and sticking effect more durable, can have high dissolving power, excellent low-temperature performance, excellent compatibility with SIS rubber, improved processing performance and use performance of the hot melt adhesive, improved dispersibility and mixability, and can take petroleum resin and rosin resin A / rosin resin B as tackifiers, can make the rosin resin and the SIS rubber co-dissolve after being blended, and can increase the adhesive force of a glue layer.

Description

Technical Field

[0001] This invention belongs to the field of hot melt adhesive technology, specifically relating to a high-holding-adhesion hot melt adhesive for hooks and its preparation method. Background Technology

[0002] Existing adhesive hooks are generally attached to the wall using glue or double-sided tape, allowing for quick installation and fixation. Adhesive hooks are widely used due to their low cost and ease of use.

[0003] Hot melt adhesive is a type of malleable adhesive whose physical state changes with temperature within a certain temperature range, while its chemical properties remain unchanged. It is non-toxic, odorless, and environmentally friendly. It also boasts advantages such as simple production processes, high added value, strong adhesion, and fast bonding speed, making it an ideal choice for adhesive materials in sticky hooks. However, the adhesive is easily affected by environmental changes such as humidity and temperature, and is prone to creep under load, resulting in hooks with short lifespans, limited hanging capacity, and a tendency to fall off walls. Patent number CN201510943401.5, entitled "An Adhesive for Hooks and Hooks Containing the Adhesive and Their Applications," includes acrylate-butyl acrylate copolymer resin, hydroxypropyl distarch phosphate, silica dispersant, and defoamer. While this acrylate adhesive exhibits high stability, its holding power is relatively low, and the addition of a defoamer significantly reduces the material's cohesive strength. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a hot melt adhesive for hooks with high holding power, which has excellent cohesion and strong holding power.

[0005] The second objective of this invention is to provide a method for preparing a hot melt adhesive for high-holding hooks.

[0006] One of the objectives of this invention is achieved through the following technical solution:

[0007] A hot melt adhesive for high holding power hooks comprises the following components by weight percentage:

[0008] Naphthenic oil 10-20%,

[0009] SIS (styrene-isoprene-styrene copolymer) rubber 35-50%,

[0010]

[0011] Furthermore, it includes the following components by weight percentage:

[0012]

[0013] Furthermore, the naphthenic oil has a viscosity of 50-500 cps at 40°C.

[0014] Furthermore, the diblock content of the SIS rubber is 40-70%.

[0015] Furthermore, the petroleum resin is any one of C5 petroleum resin, C9 petroleum resin, C5 / C9 copolymer resin, or its hydrogenated form.

[0016] Furthermore, the petroleum resin is a C5 / C9 copolymer resin with a softening point of 90-120℃.

[0017] Furthermore, the softening point of rosin resin A is 90-120℃; and the softening point of rosin resin B is 110-130℃.

[0018] Furthermore, the phenolic antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; the phosphite antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0019] The second objective of this invention is achieved by the following technical solution:

[0020] A method for preparing a high-holding-adhesion hot melt adhesive for hooks includes the following steps:

[0021] 1) Heat and stir the petroleum resin, rosin resin A and rosin resin B in the specified amounts until uniform to obtain the thickening resin;

[0022] 2) After heating the reactor, add naphthenic oil, SIS rubber, phenolic antioxidants, phosphite antioxidants, and part of the tackifying resin into the reactor. Stir at a constant temperature and simultaneously apply vacuum until the material is completely melted. Then add the remaining tackifying resin and apply vacuum again until the material is free of bubbles before discharging.

[0023] Furthermore, in step 1), the heating temperature is 120-140℃, and the stirring speed is 50-120 rpm;

[0024] In step 2), the heating temperature is 150-165℃, the initial addition amount of the tackifying resin accounts for 30-60% of its total mass, the vacuum degree of the vacuum treatment is -0.09 to -0.07 MPa, the stirring rate is 20-100 rpm, the stirring time is 1-2 h, the vacuum degree of the second vacuum treatment is -0.09 to -0.07 MPa, and the vacuum holding time is 40-60 min.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] This invention discloses a high-holding-strength hot melt adhesive for hooks, comprising naphthenic oil, SIS rubber, petroleum resin, rosin resin A, rosin resin B, phenolic antioxidants, and phosphite antioxidants. Using SIS rubber as a base material provides excellent cohesive strength while also ensuring good substrate wettability, resulting in longer-lasting adhesion. Naphthenic oil, as a softener, possesses high solubility and excellent low-temperature performance, exhibiting excellent compatibility with SIS rubber and resin materials, improving the processing and performance of the hot melt adhesive, and enhancing its dispersibility and mixability. Petroleum resin and rosin resin A / rosin resin B act as tackifiers; after blending, the rosin resin and SIS rubber are mutually soluble, increasing the adhesive layer's adhesion. Simultaneously, due to the good wettability of rosin on the adhered surface, the bonding strength and peel strength increase.

[0027] The present invention discloses a method for preparing a high-holding-adhesion hot melt adhesive for hooks. The raw materials are heated and mixed. No solvents or toxic or harmful substances are added during the preparation process. The final hot melt adhesive is an environmentally friendly and non-toxic adhesive. At the same time, a two-stage vacuum treatment is adopted. Vacuum stirring can make the materials uniform at a lower stirring rate, improve the degree of blending and remove air bubbles, and avoid the decrease in cohesion of the hot melt adhesive caused by the addition of defoamers. Detailed Implementation

[0028] The present invention will now be further described in conjunction with specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] A hot melt adhesive for high holding power hooks comprises the following components by weight percentage:

[0030]

[0031] Furthermore, it includes the following components by weight percentage:

[0032]

[0033]

[0034] Furthermore, the naphthenic oil has a viscosity of 50-500 cps at 40°C; preferably 120-160 cps.

[0035] Further, the diblock content of the SIS rubber is 40-70%; preferably, the content of the SIS rubber is 40-45%, wherein the diblock content is 45-55%.

[0036] Furthermore, the petroleum resin is any one of C5 petroleum resin, C9 petroleum resin, C5 / C9 copolymer resin, or its hydrogenated form; preferably, C5 / C9 copolymer resin provides both adhesive strength and excellent cohesive effect, resulting in longer-lasting adhesion, while also reducing costs and making the product more cost-effective.

[0037] Furthermore, the petroleum resin is a C5 / C9 copolymer resin with a softening point of 90-120℃.

[0038] Furthermore, the softening point of rosin resin A is 90-120℃; and the softening point of rosin resin B is 110-130℃.

[0039] Furthermore, the phenolic antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010); the phosphite antioxidant is tris[2,4-di-tert-butylphenyl] phosphite (antioxidant 168).

[0040] The present invention provides a hot melt adhesive for hooks with high holding power, which has excellent cohesive strength and long-lasting bonding effect.

[0041] A method for preparing a high-holding-adhesion hot melt adhesive for hooks includes the following steps:

[0042] 1) Heat and stir the petroleum resin, rosin resin A and rosin resin B in the specified amounts until uniform to obtain the thickening resin;

[0043] 2) After heating the reactor, add naphthenic oil, SIS rubber, phenolic antioxidants, phosphite antioxidants, and part of the tackifying resin into the reactor. Stir at a constant temperature and simultaneously apply vacuum until the material is completely melted. Then add the remaining tackifying resin and apply vacuum again until the material is free of bubbles before discharging.

[0044] Furthermore, in step 1), the heating temperature is 120-140℃, and the stirring speed is 50-120 rpm;

[0045] In step 2), the heating temperature is 150-165℃, the initial addition amount of the tackifying resin accounts for 30-60% of its total mass, the vacuum degree of the vacuum treatment is -0.09 to -0.07 MPa, the stirring rate is 20-100 rpm, the stirring time is 1-2 h, the vacuum degree of the second vacuum treatment is -0.09 to -0.07 MPa, and the vacuum holding time is 40-60 min.

[0046] Example 1

[0047] A hot melt adhesive for high holding power hooks comprises the following components by weight percentage:

[0048]

[0049] The naphthenic oil has a viscosity of 120-160 cps at 40°C.

[0050] The SIS rubber contains 50% diblocks.

[0051] The petroleum resin is a C5 / C9 copolymer resin with a softening point of 100°C.

[0052] The softening point of the rosin resin A is 100℃.

[0053] The softening point of the rosin resin B is 120°C.

[0054] The phenolic antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; the phosphite antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0055] A method for preparing a high-holding-adhesion hot melt adhesive for hooks includes the following steps:

[0056] 1) Heat and stir the petroleum resin, rosin resin A and rosin resin B in the specified amounts until uniform. The heating temperature is 130℃ and the stirring speed is 70rpm to obtain the thickening resin.

[0057] 2) After heating the reactor to 160℃, add naphthenic oil, SIS rubber, phenolic antioxidants, phosphite antioxidants, and 50% of the total tackifying resin into the reactor. Stir at a constant temperature and low speed of 40 rpm for 1.5 hours. Simultaneously, apply a vacuum of -0.08 MPa until the material is completely melted. Then add the remaining tackifying resin and apply a second vacuum of -0.08 MPa for 50 minutes. Once the material is free of bubbles, discharge it.

[0058] Example 2

[0059] A hot melt adhesive for high holding power hooks comprises the following components by weight percentage:

[0060]

[0061] The naphthenic oil has a viscosity of 120-160 cps at 40°C.

[0062] The SIS rubber contains 50% diblocks.

[0063] The petroleum resin is a C5 / C9 copolymer resin with a softening point of 100°C.

[0064] The softening point of the rosin resin A is 100℃.

[0065] Furthermore, the phenolic antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; the phosphite antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0066] A method for preparing a high-holding-adhesion hot melt adhesive for hooks includes the following steps:

[0067] 1) Heat and stir the petroleum resin and rosin resin A in the prescribed amounts until uniform. The heating temperature is 130℃ and the stirring speed is 70rpm to obtain the thickening resin.

[0068] 2) After heating the reactor to 160℃, add naphthenic oil, SIS rubber, phenolic antioxidants, phosphite antioxidants, and 50% of the total tackifying resin into the reactor. Stir at a constant temperature and low speed of 40 rpm for 1.5 hours. Simultaneously, apply a vacuum of -0.08 MPa until the material is completely melted. Then add the remaining tackifying resin and apply a second vacuum of -0.08 MPa for 50 minutes. Once the material is free of bubbles, discharge it.

[0069] Example 3

[0070] A hot melt adhesive for high holding power hooks comprises the following components by weight percentage:

[0071]

[0072] The naphthenic oil has a viscosity of 120-160 cps at 40°C.

[0073] The SIS rubber contains 50% diblocks.

[0074] The petroleum resin is a C5 / C9 copolymer resin with a softening point of 100°C.

[0075] The softening point of the rosin resin A is 100℃.

[0076] The softening point of the rosin resin B is 120°C.

[0077] The phenolic antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; the phosphite antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0078] A method for preparing a high-holding-adhesion hot melt adhesive for hooks includes the following steps:

[0079] 1) Heat and stir the petroleum resin, rosin resin A and rosin resin B in the specified amounts until uniform. The heating temperature is 130℃ and the stirring speed is 70rpm to obtain the thickening resin.

[0080] 2) After heating the reactor to 160℃, add naphthenic oil, SIS rubber, phenolic antioxidants, phosphite antioxidants, and 50% of the total tackifying resin into the reactor. Stir at a constant temperature and low speed of 40 rpm for 1.5 hours. Simultaneously, apply a vacuum of -0.08 MPa until the material is completely melted. Then add the remaining tackifying resin and apply a second vacuum of -0.08 MPa for 50 minutes. Once the material is free of bubbles, discharge it.

[0081] Example 4

[0082] A hot melt adhesive for high holding power hooks comprises the following components by weight percentage:

[0083]

[0084] The naphthenic oil has a viscosity of 120-160 cps at 40°C.

[0085] The SIS rubber contains 50% diblocks.

[0086] The softening point of the rosin resin A is 100℃.

[0087] The softening point of the rosin resin B is 120°C.

[0088] The phenolic antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; the phosphite antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0089] A method for preparing a high-holding-adhesion hot melt adhesive for hooks includes the following steps:

[0090] 1) Heat and stir the rosin resin A and rosin resin B in the specified amounts until uniform. The heating temperature is 130℃ and the stirring speed is 70rpm to obtain the thickening resin.

[0091] 2) After heating the reactor to 160℃, add naphthenic oil, SIS rubber, phenolic antioxidants, phosphite antioxidants, and 50% of the total tackifying resin into the reactor. Stir at a constant temperature and low speed of 40 rpm for 1.5 hours. Simultaneously, apply a vacuum of -0.08 MPa until the material is completely melted. Then add the remaining tackifying resin and apply a second vacuum of -0.08 MPa for 50 minutes. Once the material is free of bubbles, discharge it.

[0092] Example 5

[0093] A hot melt adhesive for high holding power hooks comprises the following components by weight percentage:

[0094]

[0095] The naphthenic oil has a viscosity of 120-160 cps at 40°C.

[0096] The SIS rubber contains 50% diblocks.

[0097] The petroleum resin is a C5 / C9 copolymer resin with a softening point of 100°C.

[0098] The softening point of the rosin resin A is 100℃.

[0099] The softening point of the rosin resin B is 120°C.

[0100] The phenolic antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; the phosphite antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

[0101] A method for preparing a high-holding-adhesion hot melt adhesive for hooks includes the following steps:

[0102] 1) Heat and stir the petroleum resin, rosin resin A and rosin resin B in the specified amounts until uniform. The heating temperature is 130℃ and the stirring speed is 70rpm to obtain the thickening resin.

[0103] 2) After heating the reactor to 160℃, add naphthenic oil, SIS rubber, phenolic antioxidants, phosphite antioxidants, and 50% of the total tackifying resin into the reactor. Stir at a constant temperature and low speed of 40 rpm for 1.5 hours. Simultaneously, apply a vacuum of -0.08 MPa until the material is completely melted. Then add the remaining tackifying resin and apply a second vacuum of -0.08 MPa for 50 minutes. Once the material is free of bubbles, discharge it.

[0104] Performance testing

[0105] One type of high-holding-weight hook hot melt adhesive from Examples 1-5 was applied to both sides of PE foam, 100g per side. An L-shaped hook was used for testing, with a 3*3cm bonding area, a hanging weight of 4kg, and a temperature of 23℃. The comparison of each component and the test results are shown in Table 1. A commercially available acrylic pressure-sensitive adhesive was used as a control group, with a holding time of 0.8h for a 4kg hanging weight.

[0106] Table 1

[0107]

[0108] As shown in Table 1, the hot melt adhesive for high-holding hooks in Examples 1-5 of the present invention maintains its adhesion for more than 2 hours when a 4kg weight is attached, and its holding power is much higher than that of ordinary adhesives (holding time ≤ 1 hour). This proves that the present invention has excellent cohesive force and long-lasting bonding effect. Among them, the hot melt adhesive for high-holding hooks in Example 1 has the best performance, with a holding time of ≥ 6 hours when a 4kg weight is attached. This indicates that the content of SIS rubber has a significant impact on its holding power performance. The preferred content of SIS rubber is 40-45%, which results in high holding power.

[0109] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A hot melt adhesive for high-holding hooks, characterized in that, It consists of the following components by weight percentage: Naphthenic oil 12.7%; SIS rubber 43%; Petroleum resin 14%; Rosin resin A 20%; Rosin resin B 10%; Phenolic antioxidants 0.2%; Phosphite antioxidants 0.1%; The naphthenic oil has a viscosity of 120-160 cps at 40°C; The diblock content of the SIS rubber is 50%; The petroleum resin is a C5 / C9 copolymer resin with a softening point of 100°C. The softening point of the rosin resin A is 100℃; The softening point of the rosin resin B is 120°C; The phenolic antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; The phosphite antioxidant is tris[2,4-di-tert-butylphenyl]phosphite.

2. A method for preparing the high-holding-adhesion hot melt adhesive for hooks according to claim 1, characterized in that, Includes the following steps: 1) Heat and stir the petroleum resin, rosin resin A and rosin resin B in the specified amounts until uniform to obtain the thickening resin; 2) After heating the reactor, add naphthenic oil, SIS rubber, phenolic antioxidants, phosphite antioxidants, and part of the tackifying resin into the reactor. Stir at a constant temperature and simultaneously apply vacuum until the material is completely melted. Then add the remaining tackifying resin and apply vacuum again until the material is free of bubbles before discharging.

3. The method for preparing the high-adhesion hot melt adhesive for hooks as described in claim 2, characterized in that: In step 1), the heating temperature is 120-140℃, and the stirring speed is 50-120 rpm; In step 2), the heating temperature is 150-165℃, the initial addition amount of the tackifying resin accounts for 30-60% of its total mass, the vacuum degree of the vacuum treatment is -0.09 to -0.07 MPa, the stirring rate is 20-100 rpm, the stirring time is 1-2 h, the vacuum degree of the second vacuum treatment is -0.09 to -0.07 MPa, and the vacuum holding time is 40-60 min.

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